JP3628047B2 - Magnetic recording / reproducing device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a digital video signal and a digital audio in a digital video tape recorder (hereinafter referred to as a digital VTR) having a track format for recording a digital video signal and a digital audio signal in a predetermined area of an oblique track. The present invention relates to a magnetic recording / reproducing apparatus that receives a signal as a bit stream and records the bit stream.
[0002]
[Prior art]
FIG. 38 shows a track diagram of a general home digital VTR. In FIG. 38, an oblique track is formed on the magnetic tape, and one track is divided into two areas: a video area for recording a digital video signal and an audio area for recording a digital audio signal.
[0003]
There are two methods for recording video and audio signals in such a home digital VTR. One is a so-called baseband recording method in which an analog video signal and an audio signal are input and recorded using a high-efficiency video / audio encoder. The other is a so-called transparent recording system that records a digitally transmitted bit stream.
[0004]
The latter transparent recording method is suitable for recording an ATV (Advanced Television) signal deliberated in the United States of America. The reason is that the ATV signal is a signal that has already been digitally compressed, so that a high-efficiency encoder and decoder are not required, and the image quality is not deteriorated because it is recorded as it is. On the other hand, the disadvantage is the image quality during high-speed playback and special playback such as still and slow playback. In particular, if a bit stream is recorded on an oblique track as it is, almost no image can be reproduced during high-speed reproduction.
[0005]
Now, as a digital VTR system for recording such ATV signals, a technical announcement at “International Works on HDTV '93” held in Ottawa, Canada from October 26 to 28, 1993, “A Recording” Method of ATV data on Consumer Digital VCR ". Hereinafter, this content will be described as a conventional example.
[0006]
As a basic specification of a home digital VTR prototype, in the SD (Standard Definition) mode, when a digital video signal recording rate is 25 Mbps and a field frequency is 60 Hz, one frame of video is recorded in a 10-track video area. There is. Here, if the data rate of the ATV signal is 17-18 Mbps, transparent recording of the ATV signal is possible in this SD mode.
[0007]
FIG. 39 is a head trace diagram during normal playback and high-speed playback of a digital VTR. In FIG. 39, each track is alternately recorded obliquely by heads having different azimuth angles. During normal reproduction, the tape feed speed is the same as during recording, so the head can trace along the recording track as shown in FIG. However, since the tape speed is different during high-speed playback, it is possible to trace across several tracks and play back only fragments of the same azimuth track. FIG. 39 (b) shows the case of 5 × fast forward.
[0008]
In an MPEG2 bitstream, only intra-coded blocks can be decoded independently without referring to other frames. If an MPEG2 bit stream is recorded in each track in order, the reproduction data at the time of high-speed reproduction reconstructs an image from the burst only by the intra code. At this time, the area to be reproduced is not continuous on the screen, and block fragments spread on the screen. Furthermore, since the bitstream is variable length encoded, there is no guarantee that all of the screen will be updated periodically, and some may not be updated for a long time. As a result, the image quality during high-speed playback is not sufficient and will not be accepted by a home digital VTR.
[0009]
FIG. 40 shows a block diagram of a bit stream recording apparatus capable of high speed reproduction. Here, the video area of each track is divided into a main area for recording the bit stream of all ATV signals and a copy area for recording an important part (HP data) of the bit stream used for image reconstruction during high-speed playback. Divide. At the time of high-speed playback, only the intra-coded block is effective, so this is recorded in the copy area. However, in order to further reduce the data, low frequency components are extracted from all intra-coded blocks and the HP data Record as. In FIG. 40, 1 is an input terminal for a bit stream, 2 is an output terminal for a bit stream for a main area, 3 is an output terminal for HP data, 4 is a variable length decoder, 5 is a counter I, and 6 is a data extraction circuit I. , 7 are EOB (End of Block) additional circuits. 8 is a format circuit I for each signal, and 9 is an output terminal for recording data.
[0010]
The MPEG2 bit stream is input from the input terminal 1, is output as it is from the output terminal 2, and is sequentially recorded in the main area. On the other hand, the bit stream from the input terminal 1 is also input to the variable length decoder 4, the syntax of the MPEG2 bit stream is analyzed, an intra image is detected, the timing is generated by the counter I5, and the data extraction circuit I6 Then, the low frequency components of all the blocks of the intra image are extracted, and further, EOB is added by the EOB addition circuit 7 to form HP data and recorded in the copy area.
[0011]
FIG. 41 shows a conceptual diagram during reproduction. During normal playback, all bit streams recorded in the main area 30 are played back and sent to an MPEG2 decoder outside the digital VTR. HP data recorded in the copy area is discarded. This selection is performed by data separation. On the other hand, during high-speed playback, only HP data in the copy area is collected and sent to the decoder, and the bit stream in the main area is discarded. This selection is also made by data separation.
[0012]
Next, FIG. 42 shows an example of a head trace during high-speed playback. Head scanning is synchronized to the same azimuth track if the tape speed is an integer multiple speed and the phase lock is controlled. Accordingly, the position of data to be reproduced is fixed. In FIG. 42, assuming that the portion where the output level of the reproduction signal is larger than −6 dB is reproduced, the shaded area is reproduced by one head. FIG. 42 shows an example of 9 × speed, and signal reading in this shaded area is guaranteed at 9 × speed. Therefore, HP data may be recorded in this area. However, at other speeds, signal reading is not guaranteed, and this area must be selected so that it can be read at several tape speeds.
[0013]
FIG. 43 shows an example of three tape speed scan areas in which the head is synchronized with the same azimuth track. There are several overlapping areas in the area scanned at each tape speed. A copy area is selected from these areas to ensure reading of HP data at different tape speeds. FIG. 43 shows the case of fast-forwarding of 4 times, 9 times, and 17 times, but these scan areas are the same as those of fast-forwarding of −2 times, −7 times, and −15 times.
[0014]
At some tape speeds, it is impossible for the head to trace the exact same area. This is because the number of tracks traversed by the head varies depending on the tape speed. In addition, it must be possible to trace from any identical azimuth track. FIG. 44 shows examples of head traces at different tape speeds. In FIG. 44, regions 1, 2, and 3 are selected from the overlapping region of 5 × speed and 9 × speed. By repeatedly recording the same HP data on 9 tracks, the HP data can be read out at either 5 × speed or 9 × speed.
[0015]
FIG. 45 shows an example of a head trace at 5 × speed. As can be seen from FIG. 45, by repeatedly recording the same HP data on the same number of tracks as the tape speed, the HP data can be read out by a head synchronized with the same azimuth track. Therefore, HP data can be read out in the forward and reverse directions at several tape speeds by repeating the replication of the HP data to the same number of tracks as the tape speed when performing the maximum high-speed reproduction within the specified double speed. Do.
[0016]
FIG. 46 shows examples of the main area and the copy area. In the home digital VTR, the video area of each track is composed of 135 sync blocks, the main area is 97 sync blocks, and the copy area is 32 sync blocks. As the copy area, the overlap area corresponding to 4, 9, and 17 times speed shown in FIG. 43 is selected. In this case, the data rate of the main area is about 17.46 Mbps, and the same data is recorded 17 times in the copy area, so that the data rate is about 338.8 kbps.
[0017]
[Problems to be solved by the invention]
Since the conventional magnetic recording / reproducing apparatus is configured as described above, there is an error in the track recording start point at the lower end portion of the tape when the track is bent or the scanning locus is bent during high-speed reproduction. In such a case, there is a problem in that the data in the high-speed reproduction area of these generated portions cannot be reproduced.
[0018]
In addition, since it is necessary to reproduce data in a plurality of high-speed reproduction areas with a single scan of the head, reproduction cannot be performed at a speed other than a predetermined speed that can satisfy this, so that the reproducible speed is limited and there are few problems. was there.
[0019]
Also, in the two-head drum and the four-head drum, the four-head drum has half the rotational speed of the drum, so the crossing angle between the head scanning trajectory and the track is larger, resulting in the two-head drum. There is a problem that a high-speed playback area that can be played back with a 4-head drum can be played back only at half the high-speed playback speed.
[0020]
In addition, since high-speed playback data is commonly used for all playback speeds, the high-speed playback speed of each speed depends on the time it takes to pass through the area in the length direction of the tape on which one high-speed playback screen is recorded. Since the period in which one screen data can be reproduced and displayed during playback is determined, the time for which one screen data is reproduced varies inversely with the speed, so that the screen changes quickly at high speed and changes slowly at low speed. As a result, there is a problem that it is difficult to display an easy-to-view image at all speeds.
[0021]
The present invention has been made in order to solve the above-described problems, and is capable of reliably reproducing data for high-speed reproduction even when track bending, scanning trajectory bending, or tape lower end occurs. An object is to obtain a high magnetic recording / reproducing apparatus.
[0022]
It is another object of the present invention to obtain an easy-to-use magnetic recording / reproducing apparatus capable of high-speed reproduction at many speeds.
[0023]
It is another object of the present invention to provide a magnetic recording / reproducing apparatus that can perform high-speed reproduction at the same speed in both the two-head and four-head configurations.
[0024]
It is another object of the present invention to provide a magnetic recording / reproducing apparatus capable of performing high-speed reproduction at a plurality of speeds and switching screens at easy-to-see intervals at any speed.
[0025]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a magnetic recording / reproducing apparatus according to the first aspect of the present invention, wherein a signal is recorded and reproduced on an inclined track formed on the surface of a magnetic tape by a rotating drum on which two types of azimuth heads are mounted. Means for taking out a signal used for high-speed reproduction from, means for recording the signal used for high-speed reproduction in a predetermined area of a predetermined track, means for recording a signal for identifying the track on which the signal used for high-speed reproduction is recorded, And a means for reproducing a signal for identifying the signal, and when performing high-speed reproduction at a plurality of predetermined multiple speeds (n-times speed), the signal used for the high-speed reproduction is recorded on a track of azimuths determined in advance for each multiple speed number. RecordThe area of the first azimuth track for recording the signal for low-speed double-speed reproduction and the area B of the second azimuth track for recording the signal for high-speed double-speed reproduction are defined. A copy area for recording the same data is provided at both ends of the area A and the area B.Configure as follows.
[0026]
According to a second aspect of the present invention, in the apparatus according to the first aspect, among a plurality of signals used for high-speed reproduction at even multiple speed, a low-speed reproduction signal is used for one scan of the head in the track area of the first azimuth. Recording is performed in one area of one track, and a signal for high speed double speed reproduction is recorded in a plurality of areas of one track for each scanning of the head in the second azimuth track area. .
[0027]
According to a third aspect of the present invention, in the apparatus according to the first or second aspect, among the signals used for the high-speed reproduction of the even multiple speed, the signal for the low-speed double speed reproduction is used as a head in the track area of the first azimuth. Is recorded in one area of one track per one scan, and a signal for high speed reproduction is recorded in a plurality of areas of one track per one head scan in the second azimuth track area. The head is configured to scan a tracking signal area (hereinafter referred to as an ITI area) and a subcode area at the time of each double speed reproduction.
[0029]
Claims4Then, said claim 1 thru | or claim3In the apparatus described in any one of the above, the area A for recording the data for low speed double speed reproduction and the data for high speed double speed reproduction and the copy area provided at both ends of the area B are provided in units of 5 sync blocks.
[0030]
Claims5Then, said claim 1 thru | or claim4When the area A of the first azimuth track for recording the signal for low-speed double-speed reproduction in the apparatus described in any of the above is divided into approximately five equal parts, and the areas are defined as A1, A2, A3, A4, and A5, The signals to be recorded in the areas A1 and A5 are the same signal, the area B of the second azimuth track for recording the signal for high-speed double speed reproduction is divided into approximately three equal parts, and these areas are designated as B1, B2, and B3. Sometimes, the signals recorded in the areas B1 and B3 are configured to be the same signal.
[0031]
Claims6Then, said claim 1 thru | or claim4In the apparatus according to any one of the above, high-speed reproduction data is recorded at a trajectory position intermediate between the head scanning trajectories of 2 heads having 2 types of azimuth, 2 heads of 2n speed, and 4 heads of speed 2 (n is an even number). Constitute.
[0032]
Claims7Then, said claim 1 thru | or claim4And claims6In the apparatus described in any one of the above, an area A for recording data for low-speed double speed reproduction and data for high-speed double speed reproduction, and a copy area provided at both ends of the area B are provided more toward the outside of the tape.
[0033]
Claims8Then, the apparatus of claim 1 is configured to record signals used for low-speed double even speed, high-speed forward speed, and high-speed reverse speed in the reverse direction.
[0034]
Claims9Then, the claim 1OrClaim5Of the plurality of signals used for high-speed reproduction at even multiple speeds, the low-speed double-speed reproduction signal is recorded in one area of one track per head scan in the area of the first azimuth track. Then, the signal for high speed double speed reproduction in the forward direction is recorded in a plurality of areas of one track for each scanning of the head in the area of the second azimuth track, and the signal for high speed double speed reproduction in the reverse direction is recorded in the first direction. Of the two azimuth track areas, recording is performed in a plurality of areas of one track per head scanning.
[0035]
Claims10Then, the claim 1,Claim8And claims9Among the signals used for high-speed reproduction at even multiple speeds in the apparatus described in any one of the above, one signal for one scan per head scan in the area of the first azimuth track is used as the signal for low-speed double speed reproduction. In the second azimuth track area, a signal for high-speed double-speed reproduction is recorded in a plurality of areas of one track per head scan, and a signal for high-speed double-speed reproduction in the reverse direction is recorded. The second azimuth track area is recorded in a plurality of areas of one track for each scanning of the head, and the head scans the ITI area and the subcode area at each multiple speed reproduction.
[0036]
Claims11Then, the claim 1,And claims8Or claims10In the apparatus according to any one of the above, an area A for recording a signal for low speed double speed reproduction is provided in the first azimuth track, and an area B for recording a signal for low speed double speed reproduction is provided in the subsequent second azimuth track. In addition, the length of the region B is approximately twice the length of the region A, and the position of the center of the region B in the track in the center is substantially the same as the position in the track of the center of the region A. .
[0037]
Claims12Then, the claim 1,And claims8Or claims11In the apparatus according to any one of the above, when the area B is divided into approximately three equal parts and the areas are defined as B1, B2, and B3, the signal recorded in the area A is the same as the signal recorded in the areas B1 and B3. Configure as follows.
[0038]
Claims13Then, said claim 1 thru | or claim12In the apparatus described in any one of the above, a signal to be recorded for each speed at which high speed reproduction is performed is configured exclusively for each speed, and a plurality of reproduction speed signals are recorded at different positions on the tape.
[0039]
Claims14Then said claim13In the continuous M tracks in the described apparatus, a high-speed reproduction signal of a predetermined speed is arranged at a predetermined position of a predetermined track, and recording is repeatedly performed in units of the arrangement of the signals of the M track. Are recorded at a speed of M × n times (where n is a natural number), and the signals at each speed are repeatedly recorded 2 × n times in units of M tracks.
[0040]
Claims15Then said claim14In the described apparatus, M is set to 4, and a pilot signal obtained by repeating three types of frequency signals f0, f1, f0, and f2 is used to control the tape speed.
[0041]
Claims16Then said claim15Using the signal recorded for M × n double speed reproduction in the described apparatus, any even multiple speed reproduction of M × n times or less is performed.
[0042]
Claims17Then said claim1In the described apparatus, a first azimuth track area A for recording a low-speed double-speed playback signal and a second azimuth track area B for recording a high-speed double-speed playback signal are provided. When A1, A2, and B1, B2 are provided as copy areas for recording the same data at both ends of B, the signals recorded in the copy areas A1 and A2 at both ends of area A are used for error correction, respectively. The same signal consisting of ECC data and image data is used, and the signals recorded in the copy areas B1 and B2 at both ends of the area B are the same signal consisting of ECC data and image data for error correction. Constitute.
[0043]
Claims18Then said claim1In the described apparatus, a first azimuth track area A for recording a low-speed double-speed playback signal and a second azimuth track area B for recording a high-speed double-speed playback signal are provided. When A1, A2, and B1 and B2 are provided as copy areas for recording the same data at both ends of B, the signals recorded in the copy areas A1 and A2 at both ends of area A are the same as different ECC data. The signal includes image data, and the signals recorded in the copy areas B1 and B2 at both ends of the area B are configured to be signals including the same image data as different ECC data.
[0044]
Claims19Then said claim1In the described apparatus, a first azimuth track area A for recording a low-speed double-speed playback signal and a second azimuth track area B for recording a high-speed double-speed playback signal are provided. When A1, A2, and B1 and B2 are provided as copy areas for recording the same data at both ends of B, signals recorded in the copy areas A1 and A2 at both ends of area A are set as different ECC data. The signals recorded in the copy areas B1 and B2 are configured to have different ECC data.
[0045]
Claims20Then said claim1Or claims4In the described apparatus, when the area A of the first azimuth track for recording a signal for low-speed double speed reproduction is divided into approximately five equal parts, and the areas are designated as A1, A2, A3, A4, A5, the area A1, and The signal to be recorded in the area A5 is the same signal including the ECC data for error correction and the image data, and the area B of the second azimuth track for recording the signal for high speed double speed reproduction is divided into approximately three equal parts, When the areas are B1, 2, and B3, the signals recorded in the areas B1 and B3 are configured to be the same signal including ECC data and image data.
[0046]
Claims21Then said claim1Or claims4In the described apparatus, when the area A of the first azimuth track for recording a signal for low-speed double speed reproduction is divided into approximately five equal parts, and the areas are designated as A1, A2, A3, A4, A5, the area A1, and The signal to be recorded in the area A5 is a signal including the same image data as the different ECC data, and the area B of the second azimuth track for recording the signal for high-speed double-speed reproduction is divided into approximately three equal parts. 2 and B3, the signals recorded in the areas B1 and B3 are configured to be signals including the same image data as different ECC data.
[0047]
Claims22Then said claim1Or claims4In the described apparatus, when the area A of the first azimuth track for recording a signal for low-speed double speed reproduction is divided into approximately five equal parts, and the areas are designated as A1, A2, A3, A4, A5, the area A1, and When the signals to be recorded in the area A5 are different ECC data, the area B of the second azimuth track for recording the signal for high-speed reproduction is divided into approximately three equal parts, and these areas are designated as B1, B2, and B3. The signals recorded in the area B1 and the area B3 are configured to have different ECC data.
[0048]
[Action]
According to a first aspect of the present invention, there is provided a magnetic recording / reproducing apparatus according to claim 1, wherein the apparatus records and reproduces signals on an inclined track formed on the surface of a magnetic tape by a rotating drum on which two types of azimuth heads are mounted. A signal used for high-speed playback is extracted from the signal, a signal used for high-speed playback is recorded in a predetermined area of a predetermined track, a signal for identifying the track on which the signal used for high-speed playback is recorded, and a signal for identifying the track When performing high-speed playback at a plurality of predetermined multiple speeds (n-times speed), the signals used for the high-speed playback are recorded on a track of azimuths determined in advance for each multiple speedThe area of the first azimuth track for recording the signal for low-speed double-speed reproduction and the area B of the second azimuth track for recording the signal for high-speed double-speed reproduction are defined. A copy area for recording the same data is provided at both ends of the area A and the area B.Is.
[0049]
According to a second aspect of the present invention, in the apparatus according to the first aspect, among a plurality of signals used for high-speed reproduction at an even multiple speed, a signal for low-speed reproduction at one head is scanned in the area of the first azimuth track. Is recorded in one area of one track, and a signal for high-speed double-speed reproduction is recorded in a plurality of areas of one track for one head scan of the second azimuth track area. .
[0050]
According to a third aspect of the present invention, the low-speed double-speed reproduction signal is used as a head of the first azimuth track area among a plurality of even-times high-speed reproduction signals in the apparatus according to the first or second aspect. Is recorded in one area of one track per one scan, and a signal for high speed reproduction is recorded in a plurality of areas of one track per one head scan in the second azimuth track area. The head scans the ITI area and the subcode area at the time of each multiple speed reproduction.
[0052]
Claims4In claim 1, the claims 1 to3In the apparatus described in any one of the above, the area for recording data for low speed double speed reproduction and the data for high speed double speed reproduction and the copy area provided at both ends of the area B are provided in units of 5 sync blocks.
[0053]
Claims5In claim 1, the claims 1 to4When the area A of the first azimuth track for recording the signal for low-speed double-speed reproduction in the apparatus described in any of the above is divided into approximately five equal parts, and the areas are defined as A1, A2, A3, A4, and A5, The signals to be recorded in the areas A1 and A5 are the same signal, the area B of the second azimuth track for recording the signal for high-speed double speed reproduction is divided into approximately three equal parts, and these areas are designated as B1, B2, and B3. Sometimes, the signals recorded in the areas B1 and B3 are the same signal.
[0054]
Claims6In claim 1, the claims 1 to4In the apparatus according to any one of the above, high-speed reproduction data is recorded at a trajectory position in the middle of the head scanning trajectory of 2 heads having 2 types of azimuth, 2 heads of 2n speed, and 4 heads of speed 2 (n is even). is there.
[0055]
Claims7In claim 1, the claims 1 to4And claims6In the apparatus described in any one of the above, the area for recording data for low-speed double speed reproduction and the data for high-speed double speed reproduction and the copy areas provided at both ends of the area B are provided more toward the outside of the tape.
[0056]
Claims8In the apparatus according to the first aspect, the signals used for the high-speed reproduction of the even number speed, the high-speed speed in the forward direction, and the high-speed speed in the reverse direction are recorded as the signals used for the high-speed reproduction.
[0057]
Claims9In claim 1OrClaim5Of the plurality of signals used for high-speed reproduction at even multiple speeds, the low-speed double-speed reproduction signal is recorded in one area of one track per head scan in the area of the first azimuth track. Then, the signal for high speed double speed reproduction in the forward direction is recorded in a plurality of areas of one track for each scanning of the head in the area of the second azimuth track, and the signal for high speed double speed reproduction in the reverse direction is recorded in the first direction. Of the two azimuth track areas, recording is performed in a plurality of areas of one track per head scanning.
[0058]
Claims10In claim 1,Claim8And claims9Among the signals used for high-speed reproduction at even multiple speeds in the apparatus described in any one of the above, one signal for one scan per head scan in the area of the first azimuth track is used as the signal for low-speed double speed reproduction. In the second azimuth track area, a signal for high-speed double-speed reproduction is recorded in a plurality of areas of one track per head scan, and a signal for high-speed double-speed reproduction in the reverse direction is recorded. In the second azimuth track area, recording is performed in a plurality of areas of one track for each scanning of the head, and the head scans the ITI area and the subcode area when reproducing each multiple speed.
[0059]
Claims11In claim 1,And claims8Or claims10In the apparatus according to any one of the above, an area A for recording a signal for low speed double speed reproduction is provided in the first azimuth track, and an area B for recording a signal for low speed double speed reproduction is provided in the subsequent second azimuth track. In addition, the length of the region B is approximately twice the length of the region A, and the position of the center of the region B in the track is substantially the same as the position of the center of the region A in the track.
[0060]
Claims12In claim 1,And claims8Or claims11In the apparatus according to any one of the above, when the area B is divided into approximately three equal parts and the areas are defined as B1, B2, and B3, the signal recorded in the area A is the same as the signal recorded in the areas B1 and B3. Is.
[0061]
Claims13In claim 1, the claims 1 to12In the apparatus described in any one of the above, a signal to be recorded for each speed at which high speed reproduction is performed is configured exclusively for each speed, and a plurality of reproduction speed signals are recorded at different positions on the tape.
[0062]
Claims14In the claim13In the continuous M tracks in the described apparatus, a high-speed reproduction signal of a predetermined speed is arranged at a predetermined position of a predetermined track, and recording is repeatedly performed in units of the arrangement of the signals of the M track. Is recorded at a speed of M × n (where n is a natural number), and the signal at each speed is repeatedly recorded 2 × n times in units of M tracks.
[0063]
Claims15In the claim14In the described apparatus, M is set to 4, and a pilot signal obtained by repeating three types of frequency signals f0, f1, f0, and f2 is used for controlling the tape speed.
[0064]
Claims16In the claim15Using the signal recorded for M × n double speed reproduction in the described apparatus, arbitrary even multiple speed reproduction of M × n times or less is performed.
[0065]
Claims17In the claim1In the described apparatus, a first azimuth track area A for recording a low-speed double-speed playback signal and a second azimuth track area B for recording a high-speed double-speed playback signal are provided. When A1, A2, and B1, B2 are provided as copy areas for recording the same data at both ends of B, the signals recorded in the copy areas A1 and A2 at both ends of area A are used for error correction, respectively. The same signal consisting of ECC data and image data is used, and the signals recorded in the copy areas B1 and B2 at both ends of the area B are the same signals consisting of ECC data and image data for error correction, respectively. is there.
[0066]
Claims18In the claim1In the described apparatus, a first azimuth track area A for recording a low-speed double-speed playback signal and a second azimuth track area B for recording a high-speed double-speed playback signal are provided. When A1, A2, and B1 and B2 are provided as copy areas for recording the same data at both ends of B, the signals recorded in the copy areas A1 and A2 at both ends of area A are the same as different ECC data. The signal includes image data, and the signals recorded in the copy areas B1 and B2 at both ends of the area B are signals including the same image data as different ECC data.
[0067]
Claims19In the claim1In the described apparatus, a first azimuth track area A for recording a low-speed double-speed playback signal and a second azimuth track area B for recording a high-speed double-speed playback signal are provided. When A1, A2, and B1 and B2 are provided as copy areas for recording the same data at both ends of B, signals recorded in the copy areas A1 and A2 at both ends of area A are set as different ECC data. The signals recorded in the copy areas B1 and B2 are different ECC data.
[0068]
Claims20In the claim1Or claims4In the described apparatus, when the area A of the first azimuth track for recording a signal for low-speed double speed reproduction is divided into approximately five equal parts, and the areas are designated as A1, A2, A3, A4, A5, the area A1, and The signal to be recorded in the area A5 is the same signal including the ECC data for error correction and the image data, and the area B of the second azimuth track for recording the signal for high speed double speed reproduction is divided into approximately three equal parts, When the areas are B1, 2, and B3, the signals recorded in the areas B1 and B3 are the same signal including ECC data and image data.
[0069]
Claims21In the claim1Or claims4In the described apparatus, when the area A of the first azimuth track for recording a signal for low-speed double speed reproduction is divided into approximately five equal parts, and the areas are designated as A1, A2, A3, A4, A5, the area A1, and The signal to be recorded in the area A5 is a signal including the same image data as the different ECC data, and the area B of the second azimuth track for recording the signal for high-speed double-speed reproduction is divided into approximately three equal parts. 2 and B3, signals recorded in the areas B1 and B3 are signals including the same image data as different ECC data.
[0070]
Claims22In the claim1Or claims4In the described apparatus, when the area A of the first azimuth track for recording a signal for low-speed double speed reproduction is divided into approximately five equal parts, and the areas are designated as A1, A2, A3, A4, A5, the area A1, and When the signal to be recorded in the area A5 is different ECC data, the area B of the second azimuth track for recording the signal for high speed double speed reproduction is divided into approximately three equal parts, and the areas are designated as B1, 2, and B3. The signals recorded in the areas B1 and B3 are different ECC data.
[0071]
【Example】
Example 1.
An embodiment of the present invention is shown in FIG. In FIG. 1, 101 is a bit stream input terminal, 102 is a main area bit stream output terminal, 103 is a low speed double data output terminal, and 104 is a high speed double data output terminal. Reference numeral 105 denotes a TP header analysis circuit that analyzes a transport header and outputs a transport packet including the transport header and intra data. Reference numeral 106 denotes a TP header correction circuit that corrects the separated transport header. Reference numeral 107 denotes a transport. A de-Packet circuit that converts a packet into a bit stream, 108 analyzes a header such as a sequence header and a picture header included in the bit stream, and outputs each header and intra data. 109 denotes an intra bit stream Is a special reproduction data creation circuit that forms special reproduction data at each reproduction speed and outputs it. 111 is a header addition circuit for adding a necessary header from the headers extracted by the header analysis circuit 108 to the low speed multiplication data, 111 is a packet circuit for packetizing to the data size of the transport packet, 112 is a modified TP header adding circuit for adding a corrected transport header, and 113 is a combination of the TP header correcting circuit 106, the header adding circuit 110, the packet circuit 111, and the modified TP header adding circuit 112, and is a data generation circuit for low speed multiplication. It is. Reference numeral 114 denotes a high-speed data creation circuit. Here, the high speed double data creation circuit 114 has the same configuration as the low speed double data creation circuit 113.
[0072]
Next, the operation will be described. The bit stream input from the bit stream input terminal 101 is output from the main area bit stream output terminal 102 as main area data. It is also guided to the TP header analysis circuit 105. The TP header analysis circuit 105 detects the header of the transport packet from the input bit stream, analyzes the header, and if the intra bit is included in the subsequent bit stream, the transport packet is de-packetized. The data is output to the circuit 107 and the transport header is output to the TP header correction circuit 106.
[0073]
The de-Packet circuit 107 disassembles the input transport packet and outputs it to the header analysis circuit 108 as a bit stream. The header analysis circuit 108 analyzes headers such as a sequence header and a picture header from the input bit stream, outputs only intra data to the special data creation circuit 109, and outputs the header to the header addition circuit 110.
[0074]
The special reproduction data creating circuit 109 forms special reproduction data for low speed multiplication and special reproduction data for high speed multiplication from the inputted intra data. Since the subsequent processing is the same at each reproduction speed, the creation of data for low speed multiplication will be described here. The low speed double data output from the special reproduction data generation circuit 109 is input to the low speed double data generation circuit 113. The low-speed double data input to the header addition circuit 110 in the low-speed double data creation circuit 113 is added with necessary headers among the headers input from the header analysis circuit 108 as needed, and is output to the packet circuit 111. . The packet circuit 111 packetizes the data for low speed multiplication to which the header required by the header addition circuit 110 is added for each data size of the transport packet. The packetized data for low speed multiplication is output with the corrected transport header added by the corrected TP header adding circuit 112. The corrected transport header is obtained by correcting the transport header separated by the TP header analyzing circuit 105 into an appropriate form by the TP header correcting circuit 106. In this way, the special reproduction data for low speed multiplication is converted into the form of a transport packet and output from the data output terminal 103 for low speed multiplication.
[0075]
Here, the transport packetization of the low speed double data has been described, but the same processing is applied to the high speed double data. The high-speed multiplication special reproduction data output from the special reproduction data creation circuit 109 is input to the high-speed multiplication data creation circuit 114, and a header and a modified transport header are added to the high-speed multiplication data in the form of a transport packet. Output from the output terminal 104.
[0076]
Further, the special reproduction data creation circuit 109 will be described in detail. FIG. 2 shows an embodiment of the special reproduction data creation circuit 109. 120 is an input terminal for inputting a bit stream of intra data, 121 is a variable length decoder A for creating data for low speed multiplication, and 122 is a variable length decoder B for creating special reproduction data for high speed multiplication. It is. 123 is a counter A, 124 is a counter B, 125 is a data extraction circuit A that extracts special reproduction data for low speed multiplication, 126 is a data extraction circuit B that extracts special reproduction data for high speed multiplication, and 127 is a special reproduction for low speed multiplication. EOB addition circuits A and 128 for adding an EOB (End Of Block) code to the data are EOB addition circuits B for adding EOB to the special reproduction data for high speed multiplication. Reference numeral 129 is an output terminal for outputting special reproduction data for low speed multiplication, and 130 is an output terminal for outputting special reproduction data for high speed multiplication.
[0077]
The operation of FIG. 2 will be described. The variable length decoder A121 performs variable length decoding on the input bit stream. The counter A123 counts the number of DCT coefficients decoded from the result, and outputs the result to the data extraction circuit A125. The data extraction circuit A125 extracts a bit stream corresponding to a predetermined number of DCT coefficients from the input bit stream at a predetermined timing upon input from the counter A123. The counter B124 and the data extraction circuit B126 perform the same operation as described above. The data extraction circuit A125 extracts the special reproduction data for low speed multiplication from the input bit stream, and the data extraction circuit B126 extracts the special reproduction data for high speed multiplication from the inputted bit stream. The extracted special reproduction data for low speed multiplication is added with an EOB code by the EOB addition circuit A127, and is outputted from the output terminal 129 as low speed multiplication data. The extracted special reproduction data for high-speed multiplication is added with an EOB code by the EOB addition circuit B130, and is output from the output terminal 130 as high-speed multiplication data.
[0078]
At this time, the data extraction timing may be the same or different in each data extraction circuit. The difference in timing means that the number of DCT coefficients in one video block to be recorded (unit in which direct conversion is performed on the encoder side) is different. The special reproduction area in which special reproduction data is recorded is limited as described later. Therefore, if the special reproduction area has the same area, the special reproduction area to be recorded increases when the number of DCT coefficients of one video block is increased. Many are required, and the refresh of the screen at the time of reproduction becomes slow. Instead, the image quality is improved. What is necessary is just to determine the timing which extracts data by this trade-off of refresh and image quality.
[0079]
Next, referring to FIG. 3, the synthesis of the bit stream for the main area and the special reproduction data for each double speed will be described. Reference numeral 140 is an input terminal for inputting a bit stream for the main area, 141 is an input terminal for inputting special reproduction data for low speed multiplication, and 142 is an input terminal for inputting special reproduction data for high speed multiplication. Reference numeral 143 denotes an SB format circuit that converts each input data and bit stream into a sync block format, and 144 denotes an SB output terminal that outputs SB data.
[0080]
The operation of FIG. 3 will be described. Data and a bit stream input from each input terminal are input to the SB format circuit 143. The SB format circuit 143 selects data to be recorded in each sync block from each input for each track and each sync block. A header is added to each data in sync block units, a sync block in the track is configured to have a predetermined pattern, which will be described later, and output from the SB output terminal 144.
[0081]
The operation of the SB format circuit 143 will be described in detail. In this embodiment, the drum configuration may be any of the three drum configurations shown in FIG. (However, a head A channel having two azimuth angles and one having the azimuth angle and the other is a B channel.) FIG. 4A shows 1 Ch × 2, FIG. 4B shows 2 Ch × 1, and FIG. 2Ch × 2 configuration is shown. Hereinafter, in this embodiment, a case where 4 × speed is adopted as the low speed double speed and 16 × speed is adopted as the high speed double speed will be described.
[0082]
First, the structure of the special reproduction area is shown in the figure. In FIG. 5, 150 is a B-channel low-speed double-speed recording area for recording low-speed double-speed data by the B-channel head, and 151a to 151d are A-channel high-speed double-speed recording for recording high-speed double-speed data by the A-channel head. It is an area. When a 2 Ch × 2 drum configuration is used, 150 data becomes data for a speed that is half the low speed reproduction speed of the B channel low speed double speed data, and 151 a to 151 d data is the A channel high speed data. This is data for a speed that is ½ of the high-speed playback multiple speed of the playback data. This is because, in the case of the 2Ch × 2 drum configuration, the number of times of crossing the track increases when the same double speed is used as compared to other drum configurations, so the number of sync blocks that can be reproduced per track (hereinafter, 1 This is because the area that can be reproduced per track is referred to as one burst). That is, the number of sync blocks that can be reproduced per track at the N-times speed playback used in the 1Ch × 2 and 2Ch × 1 drum configurations, and the playback per track at the N / 2 times speed playback in the 2Ch × 2 drum configurations. The number of sync blocks is almost equal.
[0083]
Further, the numbers 1 to 10 assigned to the respective blocks in FIG. 5 indicate the same data if they are the same number. Details of the data structure will be described later.
[0084]
Further, the data 150 in FIG. 5 is data composed of 50 sync blocks, and the data 151a to 151d are data composed of 15 sync blocks. The number of sync blocks assigned to each data is based on the result of calculating the number of sync blocks that can be obtained at each double speed number during high-speed playback. FIG. 6 shows the number of sync books that can be obtained from one track during each double-speed playback. In the figure, the 9000 rpm system indicates the head arrangement system shown in FIGS. 4A and 4B, and 4500 rpm indicates the head arrangement system shown in FIG. 4C. Each value in the figure is the number of sync blocks that can be reproduced from one track at each reproduction speed when high-speed reproduction is performed using a rotating head of 10 μm (the track pitch in the SD standard is 10 μm). Is shown. The calculation is made on the assumption that the number of sync blocks in one track (equivalent to 180 degrees) is 186 sync blocks, and that the reproduction output level is larger than −6 dB.
[0085]
As shown in FIG. 6, 62 sync blocks can be obtained from one track when reproducing at 4 × speed in the 9000 rpm system. Also, 12 sync blocks can be obtained from one track during 16 × playback. On the basis of this, FIG. 5 shows a data structure in consideration of the case where the track is further bent, the head scanning trajectory is bent, or the recording start position error of the track at the lower end of the tape occurs. The data 2 of 30 sync blocks is arranged at the center of the 4 × speed reproduction data indicated by 150, and the data 1 of 10 sync blocks is arranged above and below the data 2. In addition, 5 sync blocks of data 4 are arranged at the center of the 16 × speed reproduction data indicated by 151 a to 151 d, and 5 sync blocks of data 3 are arranged above and below the data 4. Since 151b-151d is the same as 151a, description is abbreviate | omitted. Thus, the same data (4 × speed data in FIG. 5) above and below the data arranged in the center of one burst (data 1 in 4 × speed data, data 4, 6, 8, 10 in 16 × speed data in FIG. 5). In the case of data 2, and in the case of 16 × speed data, 3, 5, 7, 9) are written twice so that the above-mentioned track bend, head scan trajectory bend, or error in the recording start position of the track at the lower end of the tape may occur. It is possible to minimize the influence when the playback position shifts up and down.
[0086]
An example in which each special reproduction area is arranged on a track is shown in FIG. The contents of the data area recorded from the lower end to the upper end of the track are shown at the left end of the figure. The ITI area, audio area, video area, and subcode area are arranged in order from the track bottom. The memory shown in the figure indicates a sync block address, and includes 186 sync blocks in one track (equivalent to 180 degrees). In the figure, it is composed of a total of 186 sync blocks from 0 sync block at the lower end to 185 sync block at the upper end. 160 is a first track recorded by the A channel head, 161 is a second track recorded by the B channel head, 162 is a third track recorded by the A channel head, and 163 is B A fourth track recorded by the head of the channel. Four tracks from the first track 160 to the fourth track 163 are set as one unit. f0, f1, and f2 indicate pilot signals recorded on each track for tracking. The area of the track other than the areas 150 and 151a to 151d is used as a main area for recording normal reproduction data. In the case of a drum configuration of 9000 rpm, the quadruple speed area 150 can be reproduced as data of one concentrated area by one scan of the head during quadruple speed reproduction. In the case of a drum configuration of 4500 rpm, it can be reproduced as data of one concentrated area by one scan of the head at the time of double speed reproduction, which is 1/2 the speed of the quadruple speed. In the case of a drum configuration of 9000 rpm, the 16 × speed areas 151a to 151d can be reproduced as data of four areas with one scan of the head during 16 × speed reproduction. In the case of a drum configuration of 4500 rpm, data can be reproduced as data of four areas with one scan of the head at the time of 8 × speed reproduction, which is 1/2 the speed of 16 × speed.
[0087]
In FIG. 7, the 16 × speed data area may have more double-written portions of the same data in the data area outside the tape. In FIG. 7, the areas 151a and 151d on the outside of the tape may be larger than the areas 151b and 151c located at the center of the tape. By securing the area in this manner, it is possible to cope with a slight shift in head scanning trajectory between 16 × speed reproduction in the 9000 rpm system and 8 × speed in the 4500 rpm system, and high speed reproduction can be performed more reliably. I can do it.
[0088]
The number of data areas for the 4 × speed data area and the 16 × speed data area is not limited to this.
[0089]
Further, according to the data arrangement of one unit shown in FIG. 7, the head scans the ITI area and the subcode area shown in the figure at the time of 4 × speed reproduction and 16 × speed reproduction. That is, pilot signals f0, f1, and f2 for controlling tracking in the ITI area can be obtained, and since the head also scans the subcode area, the time information and the song number which are the cueing functions in the subcode area are obtained. A function can be added by recording additional information such as information.
[0090]
A recording pattern is formed on the magnetic tape by repeating and recording one unit shown in FIG. FIG. 8 shows the recording pattern. Here, in this embodiment, the data for 4 × speed is repeatedly recorded twice, and the data for 16 × speed is repeatedly recorded 8 times.
[0091]
By forming the recording pattern in this way, it is possible to minimize the effects of track bending, head scanning trajectory bending, and track recording start position error at the lower end of the tape. In addition, since each double speed dedicated area is provided, refresh and image quality can be set according to each double speed. Further, since the head scans the ITI area and the subcode area during high-speed playback, it is possible to obtain an additional function such as a cue function using a signal recorded in the subcode area while performing tracking control.
[0092]
The data structures 150 and 151a to 151d shown in FIG. 5 are not limited to this.
[0093]
Example 2
In the special reproduction data creation circuit 109 of the first embodiment, the special reproduction data is created in the form shown in FIG. 2, but the present invention is not limited to this, and the configuration shown in FIG. 9 may be used. In the second embodiment, another configuration of the special reproduction data generation circuit 109 will be described.
[0094]
FIG. 9 shows an example of another configuration of the special reproduction data creation circuit 109. Reference numerals 120, 127, 128, 129, and 130 are the same as those in FIG. Reference numeral 500 denotes a variable length decoder C that performs variable length decoding of the input bit stream, 501 denotes a counter C, 502 denotes a data extraction circuit A that extracts data for low speed multiplication, and 503 denotes a data extraction circuit that extracts data for high speed multiplication. B.
[0095]
Next, the operation will be described. Intra data input from the input terminal 120 is input to the variable length decoder C500, the data extraction circuit A502, and the data extraction circuit B503. The variable length decoder C500 performs variable length decoding on the bit stream. From the result, the counter C501 counts the decoded DCT coefficients and outputs them to the data extraction circuit A502 and the data extraction circuit B503. The data extraction circuit A502 extracts data at a timing set in advance by input from the counter C501. Similarly, the data extracting circuit B503 extracts data independently at a preset timing. The extracted data is added with an EOB code by an EOB addition circuit A127 and an EOB addition circuit B128, and is output from an output terminal 129 and an output terminal 130, respectively. By configuring in this way, special reproduction data similar to that in the case of FIG. 2 can be created.
[0096]
Example 3
In Example 3, reproduction of a magnetic tape recorded as in Example 1 will be described. In Example 1, in the 9000 rpm system, 4 × speed was set as the low speed double speed and 16 × speed was set as the high speed double speed. In the 4500 rpm system, the double speed was set as the low speed double speed and the double speed was set as the high speed double speed. In the third embodiment, reproduction is performed at each set double speed.
[0097]
FIG. 10 is a diagram when 4 × speed reproduction is performed with a 1 Ch × 2 drum configuration. An arrow indicates scanning of the head during 4 × speed reproduction. At this time, tracking control is performed in the special reproduction area for 4 × speed reproduction. The 4x speed reproduction data is recorded in the B channel and is repeatedly recorded in 2 units. Therefore, the A channel head scans one of the 2 units and the B channel head scans the other. The 4X speed reproduction data recorded by the channel head can be reproduced. At this time, the head can also scan the subcode area and obtain a signal of the subcode area.
[0098]
FIG. 11 is a diagram when 4 × speed reproduction is performed with a 2 Ch × 1 drum configuration. An arrow indicates scanning of the head during 4 × speed reproduction. At this time, the servo is locked in the special reproduction area for quadruple speed. The 4 × speed special reproduction data is recorded in the B channel and is repeatedly recorded in 2 units. Therefore, the 2Ch head always scans one of the 2 units. Therefore, the 4 × speed reproduction data recorded by the B channel head can be reproduced. At this time, the head can scan the subcode area and obtain a signal of the subcode area.
[0099]
FIG. 12 is a diagram when the 2Ch × 2 drum configuration is played back at double speed. An arrow indicates scanning of the head during double speed playback. At this time, the servo is locked in the special reproduction area for quadruple speed. The 4 × speed special reproduction data is recorded in the B channel and is repeatedly recorded in 2 units. Therefore, the 2Ch head always scans one of the 2 units. Therefore, the 4 × speed reproduction data recorded by the B channel head can be reproduced during 2 × speed reproduction. At this time, the head can scan the subcode area and obtain a signal of the subcode area.
[0100]
FIG. 13 is a diagram when 16 × speed reproduction is performed with a 1 Ch × 2 drum configuration. An arrow indicates scanning of the head during 16 × speed reproduction. Since the special reproduction data for 16 × speed is recorded in the A channel and is repeatedly recorded for 8 units, the A channel head scans the special reproduction data for 16 × speed of one unit out of the 8 units, The head of the B channel scans the special reproduction data for 16 × speed of another 1 unit among the 8 units. Therefore, it is possible to reproduce 16 × speed data recorded by the A channel head. At this time, the head can scan the subcode area and obtain a signal of the subcode area. Note that tracking can also be applied by a pilot signal recorded in the ITI area.
[0101]
FIG. 14 is a diagram when 16 × speed playback is performed with a 2 Ch × 1 drum configuration. An arrow indicates scanning of the head during 16 × speed reproduction. Since the special reproduction data for 16 × speed is recorded repeatedly for 8 units, the 2Ch head always scans the special reproduction data for 16 × speed, which is one unit among the 8 units. Therefore, the special reproduction data for 16 × speed recorded by the head of the A channel can be reproduced. At this time, the head can scan the subcode area and obtain a signal of the subcode area. Note that tracking can also be applied by a pilot signal recorded in the ITI area.
[0102]
FIG. 15 is a diagram when 8 × speed reproduction is performed with a 2 Ch × 2 drum configuration. An arrow indicates scanning of the head during 8 × speed reproduction. Since the special reproduction data for 16 × speed is recorded repeatedly for 8 units, the 2Ch head always scans one of the 8 units. Therefore, the special reproduction data for 16 × speed recorded by the head of the A channel can be reproduced at the time of 8 × reproduction.
[0103]
Next, FIG. 16 shows signal processing during reproduction. In the figure, 200 is a reproduction data input terminal for reproduction data, 201 is a mode signal input terminal for inputting a mode signal from a system controller, etc. 202 is an ID analysis circuit for analyzing the ID of the reproduced sync block and selecting the reproduction data , 203 is an SB header analysis circuit that analyzes a header added in sync block units and selects reproduction data, 204 is an SBtoTP conversion circuit I that converts the reproduced sync block into a transport packet, and 205 is a reproduction SB output terminal. It is.
[0104]
Next, the operation will be described. The reproduction data input from the reproduction data input terminal (at this time, SD specification error correction decoding has already been performed) is input to the ID analysis circuit 202. A signal indicating the reproduction mode is simultaneously input to the ID analysis circuit 202 from the mode input terminal 201 and input to the ID analysis circuit 202. The ID analysis circuit 202 recognizes normal reproduction or special reproduction from the reproduction mode signal, and in the case of normal reproduction, the data for normal reproduction recorded in the main area is output to the next stage in units of sync blocks. In the case of special playback, the data recorded in the special playback area is output to the next stage in sync block units. Therefore, in each playback mode, the data in the other mode is discarded in sync block units. Whether the current sync block is in the main area or the special reproduction area is determined by analyzing the ID or the header added in sync block units.
[0105]
The data selected and output by the ID analysis circuit 202 is input to the SB header analysis circuit 203. The SB header analysis circuit 203 recognizes the reproduction speed from the information of the reproduction mode signal, and outputs a sync block in the special reproduction area that matches the reproduction speed. Data in the special playback area that does not match the playback mode signal is discarded. During normal playback, the input data is output as it is. The determination is made by analyzing the ID or the header added in sync block units.
[0106]
The data output from the SB header analysis circuit 203 is input to the SB to TP conversion circuit 204. The SB to TP conversion circuit 204 converts the sync block into a transport packet and outputs it from the reproduction SB output terminal 205.
[0107]
As described above, only normal data recorded in the main area is used during normal reproduction, and only special data recorded in each special reproduction area is used for special reproduction at various reproduction speeds. Special playback at each playback speed can be achieved.
[0108]
Example 4
In the third embodiment, reproduction is performed for the double speed set in the first embodiment. However, in the fourth embodiment, the reproduction speed special reproduction area set in the first embodiment is reproduced at a reproduction speed lower than the reproduction speed. .
[0109]
FIG. 17 is a diagram at the time of double speed reproduction with a 1 Ch × 2 drum configuration. The arrow indicates the head scan. At this time, the tracking control is performed in the 4 × speed special reproduction data area. The 4 × speed special reproduction data is obtained by using the 4 × speed special reproduction data recorded in the 2 × speed special reproduction area, which is repeatedly recorded by 2 units. When reproduced in this way, the same special reproduction data is reproduced twice. In this case, double-speed reproduction can be achieved by discarding either data.
[0110]
FIG. 18 is a diagram when the 2Ch × 1 drum configuration is played back at double speed. The arrow indicates the head scan. At this time, the servo is locked in the 4 × speed special reproduction data area. The special reproduction data for double speed is performed by using the special reproduction data for quadruple speed recorded in the special reproduction area for quadruple speed recorded two units repeatedly. When reproduced in this way, the same special reproduction data is reproduced twice. In this case, double-speed reproduction can be achieved by discarding either data.
[0111]
In the fourth embodiment, the example of reproducing the quadruple speed area at the double speed has been described. However, the present invention is not limited to this, and the special reproduction data is recorded in one place like the quadruple speed reproduction data of the present embodiment. In this case, the playback area having the set playback speed may be played back at a playback speed lower than the playback speed.
[0112]
Embodiment 5 FIG.
In the fifth embodiment, a recording format different from the recording format of the first embodiment will be described. In this embodiment, a case where the speed is 4 × as the low speed multiple speed speed will be described as an example. In this embodiment, both the forward direction and the reverse direction are set as the high-speed multiple speed. A description will be given by taking as an example the case of 16 × speed as the high-speed speed in the forward direction and −16 × speed as the speed in the reverse direction.
[0113]
The circuit and operation of this embodiment are the same as those shown in FIGS. 1 and 2 (or FIG. 9 of Embodiment 2) and FIG.
[0114]
First, the configuration of the special reproduction area is shown in FIG. In FIG. 19, reference numeral 170 denotes an A channel low speed double speed recording area for recording data for low speed double speed by the A channel head, and 171 denotes a B channel low speed double speed recording area for recording data for low speed double speed by the B channel head. 172a to 172f are recording areas for high-speed double speed in the forward direction by the A channel head, and 173a to 173f are recording data for high-speed playback in the reverse direction by the head of the A channel. This is a recording area for A channel reverse direction high speed double speed reproduction. When a 2Ch × 2 drum configuration is used, the data of 172a to 172f is data for a speed that is ½ of the forward high speed reproduction speed of the A channel high speed double speed data, and the data of 173a to 173f. Is data for a speed that is ½ of the high-speed playback multiple speed of the A channel reverse direction high-speed playback data. The reason is as described in the first embodiment.
[0115]
Here, the recording area for low speed and double speed will be described. As described above, in this embodiment, the A-channel low-speed double-speed recording area and the B-channel low-speed double-speed recording area are provided as the low-speed double-speed recording area. As described above, when the drum configuration of the 4500 rpm system is used, when the same speed is used as compared with the drum configuration of 9000 rpm, the number of times of crossing the track increases, so that the number of sync blocks that can be obtained in one burst is almost one. / 2. Based on this, the recording area for the low speed double speed of this embodiment obtains the same number of playback sync blocks at the same playback speed as when using the drum configuration of the 9000 rpm system when using the drum configuration of the 4500 rpm system. It is something that can be done. That is, when a drum configuration of 4500 rpm is used, an area that cannot be reproduced from the B channel low speed double speed recording area by the B channel head is reproduced by the reproduction signal from the A channel low speed double speed recording area by the A channel head. Can be supplemented.
[0116]
Further, the numbers 1 to 18 assigned to the blocks in FIG. 19 indicate the same data if they are the same number. In the figure, the data of the A channel low speed double speed recording area 170 is constituted by the data of the upper and lower end portions of the B channel low speed double speed recording area 171. The reason is as described above.
[0117]
Further, the data 170 in FIG. 19 is data composed of 20 sync blocks, the data 171 is data composed of 30 sync blocks, and the data 172a to 172f and 173a to 173f are data composed of 5 sync blocks. . The number of sync blocks allocated to each data is based on the result of calculating the number of sync blocks that can be obtained at each double speed number during high-speed playback (see FIG. 6), as in the first embodiment.
[0118]
FIG. 20 shows an example in which each special reproduction area is arranged on a track. The way of viewing the figure is the same as that of FIG. Since 160 to 163 are the same as those shown in FIG. f0, f1, and f2 indicate pilot signals for identifying the respective tracks. The areas of the tracks other than the areas 170, 171, 172a to 172f, and 173a to 173f are used as main areas for recording normal reproduction data. In the case of a drum configuration of 9000 rpm, the quadruple speed area 171 can be reproduced as one concentrated area data by one scan of the head at the time of quadruple speed reproduction. Further, in the case of a drum configuration of 4500 rpm, all the 4 × speed recording data can be reproduced by supplementing the reproduction data from the area 171 with the data in the adjacent area 170. Further, in the case of a drum configuration of 9000 rpm, the 16 × speed areas 172a to 172f can be reproduced as data of six areas with one scan of the head during 16 × speed reproduction. Further, in the case of a drum configuration of 4500 rpm, data can be reproduced as data of six areas by one scan of the head at the time of 8 × speed reproduction, which is 1/2 the speed of 16 × speed. Further, in the case of a drum configuration of 9000 rpm, the −16 × speed areas 173a to 173f can be reproduced as data of six areas by one scan of the head at the time of −16 × speed reproduction. Further, in the case of a drum configuration of 4500 rpm, data can be reproduced as data of six areas with one scan of the head at the time of -8 times speed reproduction, which is 1/2 the speed of -16 times speed.
[0119]
Note that the recording data for 16 × speed and the recording data for −16 × speed have the same data rate and the like, and the SB format circuit 143 shown in FIG. The format is generated so that it is reversed for -16 × speed. That is, in FIG. 20, the same data as the data to be recorded in the area 172a, which is the 16 × speed data area, is recorded in the area 173f, which is the −16 × speed data area, and hereinafter the areas 172b and 173e, the area 172c and the area 173d are recorded. The recording format is generated so that the area 172d and the area 173c, the area 172e and the area 173b, and finally the area 172f and the area 173a are areas for recording the same data.
[0120]
In FIG. 20, the 16 × speed data area and the −16 × speed data area may have more double-written portions of the same data in the data area outside the tape. In FIG. 20, the areas 172b and 172e, or 173b and 173e outside the tape are larger than the areas 172c and 172d or 173c and 173d located at the center of the tape, and 172a and 172f or The areas of 173a and 173f may be increased. By securing the area in this way, it is possible to cope with a slight shift in head scanning trajectory between 16 × speed reproduction and −16 × speed reproduction in the 9000 rpm system and 8 × speed and −8 × speed in the 4500 rpm system. And high-speed playback can be performed more reliably.
[0121]
The number of data areas for the 4 × speed data area, the 16 × speed data area, and the −16 × speed data area is not limited thereto.
[0122]
The above description will be described specifically by showing the playback position of the screen. FIG. 21 shows a (1) frame playback screen. In this embodiment, a case where one frame is divided into six areas will be described. (The number of screen divisions is not limited to this.) As shown in the figure, the data divided into six equal parts are arranged in the data area for 16 × speed and the data area for −16 × speed shown in FIG. For 16 × speed, the data of (1) is recorded in area 172a. Hereinafter, (2) is area 172b, (3) is area 172c, (4) is area 172d, (5) is area 172e, ( 6) is recorded in the area 172f. On the other hand, for -16 × speed data, the data of the part (6) is recorded in 173a. Hereinafter, (5) is the area 173b, (4) is the area 173c, (3) is the area 173d, and (2) is the area 173e. , (1) is recorded in the area 173f. By recording data in this way, even during high-speed playback in the reverse direction, such as -16 × speed playback, playback data is obtained in the order from the upper end portion to the lower end portion of the screen during playback, as in high-speed playback in the forward direction. Therefore, even during reverse reproduction, high-speed reproduction can be realized without providing a special reverse reordering memory.
[0123]
Further, according to the data arrangement of one unit shown in FIG. 20, the head scans the ITI area and the subcode area shown in the figure at the time of 4 × speed playback, 16 × speed playback, and −16 × speed playback. That is, pilot signals f0, f1, and f2 for controlling tracking in the ITI area can be obtained, and the head also scans the subcode area. It is possible to add a function by recording additional information such as.
[0124]
A recording pattern is formed on the magnetic tape by repeating and recording one unit shown in FIG. FIG. 22 shows the recording pattern. In this embodiment, the data for 4 × speed is repeatedly recorded twice, and the data for 16 × speed and −16 × speed is repeatedly recorded 8 times.
[0125]
By forming the recording pattern in this way, it is possible to minimize the influence of the curve of the track and the curve of the head scanning locus. In addition, since each double speed dedicated area is provided, refresh and image quality can be set according to each double speed. Further, since the head scans the ITI area and the subcode area during high-speed playback, it is possible to obtain an additional function such as a cue function using a signal recorded in the subcode area. Also, by providing a recording area for high-speed playback in the reverse direction, high-speed playback in the reverse direction can be realized without mounting a dedicated rearrangement memory during reverse playback.
[0126]
Example 6
In the sixth embodiment, reproduction of a magnetic tape recorded as in the fifth embodiment will be described. In Example 5, 4 × speed was adopted as the low speed double speed. In the 9000 rpm system, 16 × speed is set as the high speed double speed in the forward direction, and −16 × speed is set as the high speed double speed in the reverse direction. In the 4500 rpm system, the high speed double speed in the positive direction is set to 8 ×, and the high speed speed in the reverse direction is set to − 8 times speed was set. In the sixth embodiment, reproduction is performed at each set double speed.
[0127]
FIG. 23 is a diagram when 4 × speed reproduction is performed with a 1 Ch × 2 drum configuration. An arrow indicates scanning of the head during 4 × speed reproduction. At this time, tracking is controlled in the 4X special reproduction data area. The 4x speed reproduction data is recorded in the B channel and is repeatedly recorded in 2 units. Therefore, the A channel head scans one of the 2 units and the B channel head scans the other. The 4X speed reproduction data recorded by the channel head can be reproduced. At this time, the head can scan the subcode area and obtain a signal of the subcode area.
[0128]
FIG. 24 is a diagram when 4 × speed reproduction is performed with a 2 Ch × 1 drum configuration. An arrow indicates scanning of the head during 4 × speed reproduction. At this time, tracking is controlled in the 4X special reproduction data area. The 4 × speed special reproduction data is recorded in the B channel and is repeatedly recorded in 2 units. Therefore, the 2Ch head always scans one of the 2 units. Therefore, the 4 × speed reproduction data recorded by the B channel head can be reproduced. At this time, the head can scan the subcode area and obtain a signal of the subcode area.
[0129]
FIG. 25 is a diagram when 4 × speed reproduction is performed with a 2 Ch × 2 drum configuration. An arrow indicates scanning of the head during 4 × speed reproduction. At this time, tracking is controlled in the 4X special reproduction data area. The 4 × speed special reproduction data is recorded in the B channel and is repeatedly recorded in 2 units. Therefore, the 2Ch head always scans one of the 2 units. However, for the reason shown in the fifth embodiment, it is not possible to reproduce all the 4 × speed special reproduction data using only the B channel. Therefore, it can be reproduced by combining with the 4 × speed reproduction data recorded by the A channel head reproduced by the A channel head. At this time, the head can scan the subcode area and obtain a signal of the subcode area.
[0130]
FIG. 26 is a diagram when 16 × speed reproduction is performed with a 1 Ch × 2 drum configuration. An arrow indicates scanning of the head during 16 × speed reproduction. Since the special reproduction data for 16 × speed is recorded in the A channel and is repeatedly recorded for 8 units, the A channel head scans the special reproduction data for 16 × speed of one unit out of the 8 units, The head of the B channel scans the special reproduction data for 16 × speed of another 1 unit among the 8 units. Therefore, it is possible to reproduce 16 × speed data recorded by the A channel head. At this time, the head can scan the subcode area and obtain a signal of the subcode area. Note that tracking can also be applied by a pilot signal recorded in the ITI area.
[0131]
FIG. 27 is a diagram when 16 × speed reproduction is performed with a 2 Ch × 1 drum configuration. An arrow indicates scanning of the head during 16 × speed reproduction. Since the special reproduction data for 16 × speed is recorded repeatedly for 8 units, the 2Ch head always scans the special reproduction data for 16 × speed, which is one unit among the 8 units. Therefore, the special reproduction data for 16 × speed recorded by the head of the A channel can be reproduced. At this time, the head can scan the subcode area and obtain a signal of the subcode area. Note that tracking can also be applied by a pilot signal recorded in the ITI area.
[0132]
FIG. 28 is a diagram when 8 × speed reproduction is performed with a 2 Ch × 2 drum configuration. An arrow indicates scanning of the head during 8 × speed reproduction. Since the special reproduction data for 16 × speed is recorded repeatedly for 8 units, the 2Ch head always scans one of the 8 units. Accordingly, the special reproduction data for 16 × speed recorded by the head of the A channel can be reproduced at the time of 8 × speed reproduction.
[0133]
FIG. 29 is a diagram when playback is performed at −16 × speed with a drum configuration of 1 Ch × 2. The arrow indicates scanning of the head during -16 × speed playback. The -16x speed-playback data is recorded on the A channel, and since 8 units are repeatedly recorded, the A-channel head scans 1 unit of -16x speed-playback data. Then, the B channel head scans the special data for −16 × speed of another one of the eight units. Therefore, it is possible to reproduce -16 × speed data recorded by the A channel head. At this time, the head can scan the subcode area and obtain a signal of the subcode area. Note that tracking can also be applied by a pilot signal recorded in the ITI area.
[0134]
FIG. 30 is a diagram when playback is performed at −16 × speed with a drum configuration of 2 Ch × 1. The arrow indicates scanning of the head during -16 × speed playback. Since the special reproduction data for −16 × speed is recorded repeatedly for 8 units, the 2Ch head always scans the special reproduction data for −16 × speed of one unit out of the 8 units. Therefore, the special reproduction data for -16 × speed recorded by the head of the A channel can be reproduced. At this time, the head can scan the subcode area and obtain a signal of the subcode area. Note that tracking can also be applied by a pilot signal recorded in the ITI area.
[0135]
FIG. 31 is a diagram of -8 × speed reproduction with a 2Ch × 2 drum configuration. The arrow indicates scanning of the head during -8 × speed playback. Since the special reproduction data for −16 × speed is recorded repeatedly for 8 units, the 2Ch head always scans one of the 8 units. Therefore, the special reproduction data for -16 × speed recorded by the head of the A channel can be reproduced at the time of -8 × speed reproduction.
[0136]
The processing of the signal during reproduction is the same as that shown in FIG.
[0137]
In this way, only the data recorded in the main area is used during normal reproduction, and only data recorded in each special reproduction area is used for special reproduction at various reproduction speeds. The special reproduction at each reproduction speed can be achieved.
[0138]
Example 7
In the seventh embodiment, an example of the data structure of the trick-play area shown in FIG. 5 in the first embodiment will be described. FIG. 32 shows the data structure of the special reproduction area of this embodiment. In the first embodiment, areas 1 to 10 in FIG. 5 have the same numbers and are areas for recording the same data. In this embodiment, based on FIG. 5, the special reproduction data is used as the special reproduction image data and the special reproduction error correction code (ECC) added to the special reproduction data in order to correct the error occurring at the high speed reproduction. ) A data structure and data arrangement when divided into data will be described. In FIG. 5, area 1 of 150, area 3 of 151a, area 5 of 151b, area 7 of 151c, and area 9 of 151d are double writing areas of the same data. FIG. 32 shows the internal structure of data recorded in these double writing areas. First, two areas 1 of 150 are configured by data 1 consisting of 5 sync blocks and ECC 1 as shown in the figure. In addition, 150 area 2 is constituted by data 2 alone. Furthermore, the two areas 3 of 151a are both constituted by data 3. In addition, the area 4 of 151a is composed of data 4. Hereinafter, the two areas 5 of 151b are both composed of data 5, the area 6 of 151b is composed of data 6, and similarly, two areas 7 of 151c are both composed of data 7, and area 8 of 151c is data 8 It consists of. The last two areas 151d of 151d are both configured by the ECC 9, and the area 10 of 151d is configured by the data 10.
[0139]
As described above, the data structure is such that both the image data and the ECC data are double-written in the data double-writing area, so that the structure of the ECC code of the quadruple-speed data reproduced from the 150 areas is (40 , 35, 6) RS code (Reed-Solomon code which is a product code type error correction code of (code length 40, number of information 35, distance 6)).
[0140]
The data reproduction state and error correction capability at this time will be described with reference to FIG. When all the data in 150 areas of 50 sync blocks are reproduced as shown in FIG. 33 (1) (a) (represented by the arrows in the figure), the number of information is 35 for 5 pieces of information. Up to errors can be corrected. Similarly, when the five sync blocks of data 1 recorded in the area 1 at the lower end of the track among 150 areas of 50 sync blocks are not reproduced as shown in FIGS. 33 (1) and 33 (b), the number of information is 35. On the other hand, up to five errors can be corrected. In addition, as shown in FIGS. 33 (1) and 33 (c), when data of 5 sync blocks recorded in area 1 at the lower end portion of 150 areas of 50 sync blocks and ECC1 for a total of 10 sync blocks are not reproduced. Similarly, up to 5 errors can be corrected for 35 pieces of information. Similarly, when the five sync blocks of ECC1 recorded in area 1 at the upper end portion of the 150 areas of 50 sync blocks are not reproduced as shown in FIGS. 33 (1) and 33 (d), the number of pieces of information is 35. Up to 5 errors can be corrected. Further, as shown in FIGS. 33 (1) and 33 (e), when data of 5 sync blocks recorded in area 1 at the upper end portion of 150 areas of 50 sync blocks and ECC1 for a total of 10 sync blocks are not reproduced. Similarly, up to 5 errors can be corrected for 35 pieces of information.
[0141]
Further, the configuration of the ECC code of the data for 16 × speed is also a (40, 35, 6) RS code. The data reproduction state and error correction capability at this time will be described with reference to FIG. The four 16 × speed areas 151a to 151d are reproduced by one head scan, and the reproduction state of each area is assumed to be substantially the same. When all the data in the areas 151a to 151d of the 15 sync blocks are reproduced as shown in FIG. 33 (2) (a) (represented by the arrows in the figure), the number of information is 35. Up to 5 errors can be corrected. Moreover, as shown in FIGS. 33 (2) and 33 (b), data 3 recorded in the area 3, area 5, area 7 and area 9 at the bottom end of the track among the areas 151a to 151d of the 15 sync blocks, respectively, Similarly, when 5 sync blocks of data 5, data 7 and ECC 9 are not reproduced, up to 5 errors can be corrected for 35 pieces of information. Further, as shown in FIGS. 33 (2) and 33 (c), data 3 recorded in the area 3, area 5, area 7 and area 9 at the upper end of the track among the respective areas 151a to 151d of the 15 sync blocks, respectively, Similarly, when 5 sync blocks of data 5, data 7 and ECC 9 are not reproduced, up to 5 errors can be corrected for 35 pieces of information. By configuring the data in this manner, the ECC configuration is the same for the 4 × speed and 16 × speed special reproduction data, and the ECC circuit can be shared, so that the circuit scale can be reduced.
[0142]
Example 8 FIG.
In the eighth embodiment, as in the seventh embodiment, an example of the data structure of the special reproduction area shown in FIG. 5 in the first embodiment will be described. FIG. 34 illustrates a data configuration and data arrangement when special reproduction data recorded in the special reproduction area of this embodiment is divided into special reproduction image data and special reproduction ECC data. In FIG. 34, first, two areas 1 of 150 are composed of data 1 consisting of 5 sync blocks and ECC 1A, which corresponds to the lower end portion of the track (the lower portion of area 2). On the other hand, the one corresponding to the upper end portion of the track (the upper portion of area 2) is composed of data 1 consisting of 5 sync blocks and ECC 1B. Note that ECC1A and ECC1B are different ECC data. Further, 150 area 2 is constituted only by data 2. Furthermore, the two areas 3 of 151a are both constituted by data 3. In addition, the area 4 of 151a is composed of data 4. Hereinafter, the two areas 5 of 151b are both composed of data 5, the area 6 of 151b is composed of data 6, and similarly, two areas 7 of 151c are both composed of data 7, and area 8 of 151c is data 8 It consists of. As shown in the figure, the last two areas 9d of 151d are constituted by an ECC 9A composed of 5 sync blocks, which corresponds to the lower end of the track (the lower part of area 10). On the other hand, the one corresponding to the upper end portion of the track (the upper portion of the area 10) is constituted by an ECC 9B composed of five sync blocks. The ECC 9A and ECC 9B are different data. Further, the area 10 of 151d is constituted by data 10.
[0143]
As described above, image data is written twice in the double writing area of data, and ECC data is structured so that the same data is written only once, so that data for quadruple speed reproduced from 150 areas is obtained. The configuration of the ECC code is (45, 35, 11) RS code (Reed-Solomon code which is a product code type error correction code of (code length 45, number of information 35, distance 11)).
[0144]
The data reproduction state and error correction capability at this time will be described with reference to FIG. When all the data of 150 areas of 50 sync blocks are reproduced as shown in FIG. 35 (1) (a) (showing the portion reproduced by the arrow in the figure), 10 pieces of information are obtained for 35 pieces of information. Up to errors can be corrected. Similarly, when the five sync blocks of data 1 recorded in the area 1 at the lower end of the track among 150 areas of 50 sync blocks are not reproduced as shown in FIGS. 35 (1) and 35 (b), the number of information is 35. On the other hand, up to 10 errors can be corrected. In addition, as shown in FIGS. 35 (1) and 35 (c), when data of 5 sync blocks recorded in area 1 at the lower end portion of 150 areas of 50 sync blocks and ECC1A total of 10 sync blocks are not reproduced. Can correct up to 5 errors for 35 pieces of information. In addition, as shown in FIGS. 35 (1) and 35 (d), when the five sync blocks of ECC1B recorded in area 1 at the upper end portion of the 150 areas of 50 sync blocks are not reproduced, Up to errors can be corrected. Also, as shown in FIGS. 35 (1) and 35 (e), when data of 5 sync blocks recorded in area 1 at the upper end portion of 150 areas of 50 sync blocks and ECC1B for a total of 10 sync blocks are not reproduced. Can correct up to 5 errors for 35 pieces of information.
[0145]
Further, the configuration of the ECC code of the data for 16 × speed is also a (45, 35, 11) RS code. The data reproduction state and error correction capability at this time will be described with reference to FIG. The four 16 × speed areas 151a to 151d are reproduced by one head scan, and the reproduction state of each area is assumed to be substantially the same. When all the data in the areas 151a to 151d of the 15 sync blocks are reproduced as shown in FIG. 35 (2) (a) (represented by the arrows in the figure), the number of information is 35. Up to 10 errors can be corrected. Also, as shown in FIGS. 35 (2) and 35 (b), data 3 recorded in the area 3, area 5, area 7 and area 9 at the bottom end of the track among the areas 151a to 151d of the 15 sync blocks, respectively, When 5 sync blocks of data 5, data 7, and ECC 9A are not reproduced, up to 5 errors can be corrected for 35 pieces of information. Further, as shown in FIGS. 35 (2) and 35 (c), data 3 recorded in the area 3, area 5, area 7, and area 9 at the upper end of the track among the areas 151a to 151d of the 15 sync blocks, respectively, If 5 sync blocks of data 5, data 7, and ECC 9B are not reproduced, up to 5 errors can be corrected for 35 pieces of information. By configuring the data in this manner, the ECC configuration is the same for the 4 × speed and 16 × speed special reproduction data, and the ECC circuit can be shared, so that the circuit scale can be reduced.
[0146]
Example 9
In the ninth embodiment, as in the seventh and eighth embodiments, an example of the data structure of the special reproduction area shown in FIG. 5 in the first embodiment will be described. FIG. 36 illustrates a data configuration and data arrangement when special reproduction data recorded in the special reproduction area of this embodiment is divided into special reproduction image data and special reproduction ECC data. In FIG. 36, first, two areas 1 of 150 are constituted by an ECC 1A composed of 10 sync blocks, as shown in the figure, the one corresponding to the lower end portion of the track (the lower portion of area 2). On the other hand, the one corresponding to the upper end portion of the track (the upper portion of area 2) is composed of ECC1B composed of 10 sync blocks. Note that ECC1A and ECC1B are different ECC data. In addition, 150 area 2 is constituted by data 2. Furthermore, the two areas 3 of 151a are both composed of data 3, and the area 4 of 151a is composed of data 4. Similarly, the two areas 5 of 151b are both composed of data 5, and the area 6 of 151b is composed of data 6. Further, as shown in the figure, the two areas 7 of 151c are constituted by an ECC 7A composed of five sync blocks, which corresponds to the lower end portion of the track (the lower portion of the area 8). On the other hand, the one corresponding to the upper end portion of the track (the portion above the area 8) is constituted by an ECC 9B composed of five sync blocks. Note that ECC7A and ECC7B are different data. Further, the area 8 of 151c is constituted by data 8. As shown in the figure, the last two areas 9d of 151d are constituted by an ECC 9A composed of 5 sync blocks, which corresponds to the lower end of the track (the lower part of area 10). On the other hand, the one corresponding to the upper end portion of the track (the upper portion of the area 10) is constituted by an ECC 9B composed of five sync blocks. The ECC 9A and the ECC 9B are different data. Further, the area 10 of 151d is constituted by data 10.
[0147]
As described above, in the first embodiment, the image data and the ECC data are both written in the double writing area of the data shown in FIG. The structure of the ECC code of the quadruple speed data is (50, 30, 21) RS code ((Reed-Solomon code which is a product code type error correction code of (code length 50, number of information 30, distance 21)). .
[0148]
The data reproduction state and error correction capability at this time will be described with reference to FIG. When all the data of 150 areas of 50 sync blocks are reproduced as shown in FIG. 37 (1) (a) (represented by the arrows in the figure), the number of information is 30 for 20 pieces of information. Up to errors can be corrected. In addition, as shown in FIGS. 37 (1) and 37 (b), when 10 sync blocks of ECC1A recorded in area 1 at the lower end of the track among 150 areas of 50 sync blocks are not reproduced, Up to 10 errors can be corrected. In addition, as shown in FIGS. 37 (1) and 37 (c), when 10 sync blocks of ECC1B of 10 sync blocks recorded in area 1 at the upper end of 150 areas of 50 sync blocks are not reproduced, the number of information is 30. On the other hand, up to 10 errors can be corrected.
[0149]
Further, the configuration of the ECC code of the 16 × speed data is also a (50, 30, 21) RS code. The data reproduction state and error correction capability at this time will be described with reference to FIG. The four 16 × speed areas 151a to 151d are reproduced by one head scan, and the reproduction state of each area is assumed to be substantially the same. As shown in FIG. 37 (2) (a), when all the data in the areas 151a to 151d of the 15 sync blocks are reproduced (represented by the arrows in the figure), the number of pieces of information is 30. , Up to 20 errors can be corrected. Also, as shown in FIGS. 37 (2) and (b), data 3 recorded in the area 3, area 5, area 7 and area 9 at the lower end of the track among the respective areas 151a to 151d of 15 sync blocks, respectively, When data 5, ECC7A, and ECC9A are not reproduced for 5 sync blocks, up to 10 errors can be corrected for 30 pieces of information. Further, as shown in FIGS. 37 (2) and 37 (c), data 3 recorded in the area 3, area 5, area 7 and area 9 at the upper end of the track among the areas 151a to 151d of the 15 sync blocks, respectively, When data 5, ECC 7B, and ECC 9B are not reproduced for 5 sync blocks, up to 10 errors can be corrected for 30 pieces of information. By configuring the data in this manner, the ECC configuration is the same for the 4 × speed and 16 × speed special reproduction data, and the ECC circuit can be shared, so that the circuit scale can be reduced.
[0150]
It should be noted that the positions of the ECC data in the special reproduction data area in the seventh to ninth embodiments are the same as the double reproduction of the special reproduction data located at both ends of each double speed reproduction data area shown in FIG. Although the case where it is arranged in the writing area has been described, the present invention is not limited to this, and the one-time writing portion of special reproduction data located at the center of each double speed number reproduction data area (in the example of the quadruple speed area in FIG. It may be arranged in 2).
[0151]
In addition, the special reproduction area when the recording format of the first embodiment is adopted in the seventh to ninth embodiments has been described. However, the recording format is not limited to this, and the seventh to ninth embodiments are described above. The data structure shown is also effective in the format shown in the fifth embodiment.
[0152]
【The invention's effect】
As described above, according to the first aspect of the magnetic recording / reproducing apparatus of the present invention, when high-speed reproduction is performed at a plurality of predetermined double speeds (n-times speed), signals used for high-speed reproduction are provided for each multiple speed number. By recording on a predetermined azimuth track, an efficient high-speed reproduction data arrangement can be performed, so that an apparatus for realizing a high-quality high-speed reproduction image can be obtained.Also, the area A of the first azimuth track for recording the signal for low speed reproduction and the area B of the second azimuth track for recording the signal for high speed reproduction, the area size is area A> Since the copy area for recording the same data is provided at both ends of the area A and the area B, the track is bent or the head scanning trajectory is bent during high-speed reproduction, or an error in the recording start point of the track at the lower end of the tape occurs. Even in some cases, high-speed reproduction data can be interpolated by double writing of data, so that the influence of the above can be minimized and a more reliable device can be obtained.
[0153]
According to the second aspect of the present invention, among the signals used for high-speed playback at even multiple speeds, a signal for low-speed playback is used as one of one track per scan of the head in the track area of the first azimuth. Since the signal for high-speed double-speed reproduction is recorded in a plurality of areas of one track for each scanning of the head in the second azimuth track area, data can be efficiently reproduced at high-speed reproduction. In addition, since the high-speed reproduction data is reproduced at only one position of one track per scanning of the head at the time of low-speed double-speed reproduction, even if the curve of the track or the curve of the scanning trajectory occurs, By scanning the head based on the recording area of the high-speed reproduction data, the data can be reproduced accurately, so that a highly reliable device can be obtained.
[0154]
According to the third aspect of the present invention, among the signals used for high-speed playback at even multiple speeds, a signal for low-speed playback is used as one of one track for one scan of the head in the track area of the first azimuth. The high-speed double-speed playback signal is recorded in a plurality of areas of one track for each scanning of the head in the second azimuth track area, and the head is in the ITI area during each double-speed playback. Since the sub-code area is scanned, additional information can be recorded in the sub-code area and used during high-speed reproduction, so that a more multifunctional device can be obtained.
[0156]
Claims4According to the above, since the copy areas provided at both ends of the area A and the area B for recording the data for the low speed double speed reproduction and the high speed double speed reproduction are provided in units of 5 sync blocks, Even if there is an error in the recording start point of the track at the bottom of the tape or at the bottom of the tape, the high-speed playback data can be interpolated by double-writing the data, so the influence of the above can be minimized and more reliable Can be obtained.
[0157]
Claims5According to the above, when the area A of the first azimuth track for recording the signal for low speed double speed reproduction is divided into approximately five equal parts, and the areas are defined as A1, A2, A3, A4, A5, the area A1, and When the signal to be recorded in the area A5 is the same signal, the area B of the second azimuth track for recording the signal for high-speed reproduction is divided into approximately three equal parts, and the areas are defined as B1, 2, and B3. Since the signals to be recorded in the B1 and the area B3 are the same signal, even when there is an error in the track bending, the head scanning locus, or the track recording start point at the lower end of the tape during high-speed reproduction, the data is doubled. Since high-speed reproduction data can be interpolated by writing, the above-described influence can be minimized, and a more reliable device can be obtained.
[0158]
Claims6According to the above, high-speed playback data is recorded at a trajectory position in the middle of the head scanning trajectory of 2n speeds with 2 heads, 2n speeds with 4 heads, and double speeds with 4 heads (n is an even number). The playback speed is not limited, and a user-friendly device can be obtained.
[0159]
Claims7According to the above, since the copy areas provided at both ends of the area A and the area B for recording data for low speed double speed reproduction and high speed double speed reproduction are provided on the outer side of the tape, the high speed reproduction speed is limited by the head configuration. In addition, even when there is a curve of the track or head scanning trajectory during high-speed playback, or when there is an error in the track recording start point at the lower end of the tape, high-speed playback data can be interpolated by double-writing data. Therefore, the influence of the above can be minimized, and a more reliable and user-friendly device can be obtained.
[0160]
Claims8According to the above, since the signals used for the high-speed reproduction of the even-numbered speed, the high-speed double speed in the forward direction, and the high-speed double speed in the reverse direction are recorded as the signals used for the high-speed reproduction, A rearrangement memory for rearrangement becomes unnecessary, and the circuit scale can be reduced.
[0161]
Claims9According to the above, out of a plurality of signals used for high-speed reproduction at even multiple speed, a signal for low-speed reproduction is recorded in one area of one track per one head scan in the area of the first azimuth track. Then, the signal for high speed double speed reproduction in the forward direction is recorded in a plurality of areas of one track for each scanning of the head in the area of the second azimuth track, and the signal for high speed double speed reproduction in the reverse direction is recorded in the first direction. Since recording is performed in a plurality of areas of one track for each scanning of the head in the area of two azimuth tracks, the head is scanned with reference to the recording area of one low speed double speed reproduction data during low speed double speed reproduction. Data can be accurately reproduced, and high-speed reproduction data in a plurality of areas of one track per scan can be reproduced even during high-speed reproduction in the forward and reverse directions. It is possible to obtain a device which performs playback.
[0162]
Claims10According to the above, out of a plurality of signals used for high-speed reproduction at even multiple speed, a signal for low-speed reproduction is recorded in one area of one track per one head scan in the area of the first azimuth track. Then, a high-speed double-speed playback signal is recorded in a plurality of areas of one track per head scan in the second azimuth track area, and a reverse high-speed double-speed playback signal is recorded in the second azimuth. In one track area, one head is scanned in multiple areas of one track, and the head scans the ITI area and subcode area when reproducing each multiple speed, so additional information is recorded in the subcode area. In addition, since it can be used during high-speed playback, a more multifunctional device can be obtained.
[0163]
Claims11According to the above, an area A for recording a signal for low-speed double speed reproduction is provided in the first azimuth track, and an area B for recording a signal for low-speed double speed reproduction is provided in the subsequent second azimuth track. Since the length of B is approximately twice the length of the region A and the position in the center track of the region B is substantially the same as the position in the track in the center of the region A. When the head configuration is two heads, it is possible to reproduce the high-speed reproduction area in the second azimuth track, and in the case of the four-head structure, it is possible to reproduce the high-speed reproduction areas of the first and second azimuth tracks. Since the total of two azimuth heads can reproduce the track area of the same length in both head configurations, it is possible to use high-speed reproduction data of the same data amount at high-speed reproduction at the same speed. Kill. Therefore, the high-speed playback speed is not limited by the head configuration, and the quality of high-speed playback images can be made the same in any head configuration, so that a user-friendly device can be obtained.
[0164]
Claims12According to the above, the area B to be recorded on the second azimuth track is approximately divided into three equal parts, and the first and third data of the three divided data are recorded on the first azimuth track. Data recorded on azimuth tracks can be configured by simple rearrangement means.
[0165]
Claims13According to the above, since the data to be recorded is constituted according to the speed at which the high speed reproduction is performed and is recorded in different tape areas, it is possible to record the screen that is switched at the most easily viewable period when performing the high speed reproduction at each speed. .
[0166]
Claims14According to the above, since data of a predetermined arrangement is repeatedly recorded in units of M tracks, the drum rotation control and the tape are performed so as to reproduce the high speed reproduction data recorded in one place on the M track when performing high speed reproduction. For example, when high-speed playback is performed at M × n double speed, compared with the case where high-speed playback data is recorded at one place on the M × n track, the transition state when the playback speed is changed There is an advantage that the amount of movement to a predetermined track on the average is small, and high-speed reproduction data can be reproduced quickly.
[0167]
Claims15According to the above, high-speed reproduction data is recorded in a predetermined arrangement in units of four tracks, and an arbitrary track of four tracks is selected and the head is scanned using three types of pilot signals f0, f1, f0, and f2. Therefore, there is an advantage that high-speed reproduction data recorded in a predetermined area based on the pilot signal can be reproduced.
[0168]
Claims16According to the above, since the data recorded for M × n double speed can be used for reproduction at any even multiple speed less than or equal to M × n double speed, a user-friendly device can be obtained.
[0169]
Claims17According to the present invention, the area A of the first azimuth track for recording the signal for low-speed double speed reproduction and the area B of the second azimuth track for recording the signal for high-speed double speed reproduction are provided. When A1, A2, and B1, B2 are provided as copy areas for recording the same data at both ends of B, the signals recorded in the copy areas A1 and A2 at both ends of area A are used for error correction, respectively. Since the same signal consisting of ECC data and image data is used, and the signal recorded in the copy areas B1 and B2 at both ends of the area B is the same signal consisting of ECC data and image data for error correction, respectively. Stable error correction can be performed, and a highly reliable device can be obtained. Further, since the error correction codes for the high speed double speed and the low speed double speed are common, the ECC circuit can be shared, so that the circuit scale can be reduced.
[0170]
Claims18According to the present invention, the area A of the first azimuth track for recording the signal for low-speed double speed reproduction and the area B of the second azimuth track for recording the signal for high-speed double speed reproduction are provided. When A1, A2, and B1 and B2 are provided as copy areas for recording the same data at both ends of B, the signals recorded in the copy areas A1 and A2 at both ends of area A are the same as different ECC data. Since the signal includes image data, and the signals recorded in the copy areas B1 and B2 at both ends of the area B are signals including the same image data as different ECC data, stable error correction can be performed and reliability is improved. Can be obtained. Further, since the error correction codes for the high speed double speed and the low speed double speed are common, the ECC circuit can be shared, so that the circuit scale can be reduced.
[0171]
Claims19According to the present invention, the first azimuth track area A for recording a low speed double speed reproduction signal and the second azimuth track area B for recording a high speed double speed reproduction signal are provided. When A1, A2, and B1 and B2 are provided as copy areas for recording the same data at both ends of B, signals recorded in the copy areas A1 and A2 at both ends of area A are set as different ECC data. Since the signals recorded in the copy areas B1 and B2 are different ECC data, stable error correction can be performed and a highly reliable apparatus can be obtained. Further, since the error correction codes for the high speed double speed and the low speed double speed are common, the ECC circuit can be shared, so that the circuit scale can be reduced.
[0172]
Claims20According to the above, when the area A of the first azimuth track for recording the signal for low speed double speed reproduction is divided into approximately five equal parts, and the areas are defined as A1, A2, A3, A4, A5, the area A1, and The signal to be recorded in the area A5 is the same signal including the ECC data for error correction and the image data, and the area B of the second azimuth track for recording the signal for high speed double speed reproduction is divided into approximately three equal parts, When the areas are B1, 2, and B3, the signals recorded in the areas B1 and B3 are the same signal including ECC data and image data, so that stable error correction can be performed and reliability is improved. Can be obtained. Further, since the error correction codes for the high speed double speed and the low speed double speed are common, the ECC circuit can be shared, so that the circuit scale can be reduced.
[0173]
Claims21According to the above, when the area A of the first azimuth track for recording the signal for low speed double speed reproduction is divided into approximately five equal parts, and the areas are defined as A1, A2, A3, A4, A5, the area A1, and The signal to be recorded in the area A5 is a signal including the same image data as the different ECC data, and the area B of the second azimuth track for recording the signal for high-speed double-speed reproduction is divided into approximately three equal parts. 2 and B3, the signals recorded in the areas B1 and B3 are signals including the same image data as different ECC data, so that stable error correction can be performed and reliability is high. A device can be obtained. Further, since the error correction codes for the high speed double speed and the low speed double speed are common, the ECC circuit can be shared, so that the circuit scale can be reduced.
[0174]
Claims22According to the above, when the area A of the first azimuth track for recording the low-speed double-speed playback signal is divided into approximately five equal parts, and the areas are defined as A1, A2, A3, A4, A5, When signals to be recorded in the area A5 are different ECC data, and the area B of the second azimuth track for recording the signal for high speed double speed reproduction is divided into approximately three equal parts, and the areas are designated as B1, 2, and B3. Since the signals recorded in the areas B1 and B3 are different ECC data, stable error correction can be performed and a highly reliable device can be obtained. Further, since the error correction codes for the high speed double speed and the low speed double speed are common, the ECC circuit can be shared, so that the circuit scale can be reduced.
[Brief description of the drawings]
FIG. 1 is a diagram showing an embodiment of the present invention.
FIG. 2 is an example of a block diagram of a trick-play data creation circuit of the present invention.
FIG. 3 is an example of a block diagram for performing the sync block configuration of the present invention.
FIG. 4 is a diagram showing three types of drum configurations employed in the present invention.
FIG. 5 is a diagram illustrating a configuration of a special reproduction area according to the first embodiment of the present invention.
6 is a diagram showing sync blocks that can be obtained during high-speed playback when the three types of drum configurations shown in FIG. 4 are employed. FIG.
FIG. 7 is a diagram showing a track pattern including an arrangement of special reproduction areas according to the first embodiment of the present invention.
FIG. 8 is a diagram showing a recording pattern of Example 1 of the present invention.
FIG. 9 is a block diagram showing another configuration of the special data creation circuit of the present invention.
FIG. 10 is a diagram when the recording pattern configured in Example 1 of the present invention is reproduced at 4 × speed with a 1 Ch × 2 drum configuration.
FIG. 11 is a diagram when the recording pattern configured in Example 1 of the present invention is reproduced at 4 × speed with a 2Ch × 1 drum configuration.
FIG. 12 is a diagram when the recording pattern configured in Example 1 of the present invention is reproduced at a double speed with a 2Ch × 2 drum configuration.
FIG. 13 is a diagram when the recording pattern configured in Example 1 of the present invention is reproduced at 16 × speed with a 1 Ch × 2 drum configuration.
FIG. 14 is a diagram when the recording pattern configured in Example 1 of the present invention is reproduced at 16 × speed with a 2Ch × 1 drum configuration.
FIG. 15 is a diagram when the recording pattern configured in Example 1 of the present invention is reproduced at 8 × speed with a 2Ch × 2 drum configuration.
FIG. 16 is a diagram showing signal processing when the recording pattern configured in Embodiment 1 of the present invention is reproduced.
FIG. 17 is a diagram when the special reproduction area for 4 × speed is reproduced at 2 × speed with the 1Ch × 2 drum configuration of the recording pattern configured in Embodiment 1 of the present invention.
FIG. 18 is a diagram when the recording pattern configured in Example 1 of the present invention is reproduced at 2 × speed in a 4 × speed special reproduction area with a 2Ch × 1 drum configuration.
FIG. 19 is a diagram illustrating a configuration of a special reproduction area according to the fifth embodiment of the present invention.
FIG. 20 is a diagram showing a track pattern including an arrangement of special reproduction areas according to the fifth embodiment of the present invention.
FIG. 21 is a playback screen diagram for explaining a data structure of high-speed playback in the forward direction and high-speed playback in the reverse direction.
FIG. 22 is a diagram showing a recording pattern of Example 5 of the present invention.
FIG. 23 is a diagram when the recording pattern configured in Example 5 of the present invention is reproduced at 4 × speed with a 1 Ch × 2 drum configuration.
FIG. 24 is a diagram when the recording pattern configured in Example 5 of the present invention is reproduced at 4 × speed with a 2Ch × 1 drum configuration.
FIG. 25 is a diagram when the recording pattern configured in Example 5 of the present invention is reproduced at 4 × speed with a 2Ch × 2 drum configuration.
FIG. 26 is a diagram when the recording pattern configured in Example 5 of the present invention is reproduced at 16 × speed with a 1 Ch × 2 drum configuration.
FIG. 27 is a diagram when the recording pattern configured in Example 5 of the present invention is reproduced at 16 × speed with a 2Ch × 1 drum configuration.
FIG. 28 is a diagram when the recording pattern configured in Example 5 of the present invention is reproduced at 8 × speed with a 2Ch × 2 drum configuration.
FIG. 29 is a diagram when the recording pattern configured in Example 5 of the present invention is reproduced at −16 × speed with a 1 Ch × 2 drum configuration.
FIG. 30 is a diagram when the recording pattern configured in Example 5 of the present invention is reproduced at −16 × speed with a 2Ch × 1 drum configuration.
FIG. 31 is a diagram when the recording pattern configured in Example 5 of the present invention is reproduced at −8 × speed with a 2Ch × 2 drum configuration.
32 is a diagram illustrating an example of a data configuration including ECC of the trick-play area illustrated in FIG. 5 according to the first embodiment of this invention.
FIG. 33 is a diagram for explaining a reproduction state in an example of a data configuration including ECC in the trick-play area shown in FIG. 5 according to the first embodiment of the present invention.
34 is a diagram showing an example of a data configuration including ECC of the trick-play area shown in FIG. 5 according to the first embodiment of the present invention.
FIG. 35 is a diagram for explaining a reproduction state in an example of a data configuration including ECC of the trick-play area shown in FIG. 5 according to the first embodiment of the present invention.
36 is a diagram showing an example of a data configuration including ECC of the trick-play area shown in FIG. 5 according to the first embodiment of the present invention.
FIG. 37 is a diagram for explaining a reproduction state in an example of a data configuration including ECC of the trick-play area shown in FIG. 5 according to the first embodiment of the present invention.
FIG. 38 is a diagram showing a track of a general home digital VTR.
FIG. 39 is a diagram showing head traces during normal playback and high-speed playback of a digital VTR.
FIG. 40 is a diagram illustrating a block configuration of a conventional bitstream recording apparatus capable of high-speed playback.
FIG. 41 is a diagram illustrating a concept during conventional playback.
FIG. 42 is a diagram illustrating an example of a head trace during high-speed playback.
FIG. 43 is a diagram showing an example of scan areas at three tape speeds.
FIG. 44 is a diagram showing an example of head traces with different tape speeds.
FIG. 45 is a diagram illustrating an example of a head trace at 5 × speed.
FIG. 46 is a diagram illustrating an example of a main area and a copy area.
[Explanation of symbols]
150 B channel low speed double speed recording area, 151a to 151d A channel high speed double speed recording area, 160 first track, 161 second track, 162 third track, 163 fourth track, 170 A channel low speed double speed Recording area, 171 B channel low speed double speed recording area, 172a to 172f A channel forward high speed double speed recording area, 173a to 173f A channel reverse high speed double speed recording area.

Claims (22)

In a device for recording and reproducing a signal on an inclined track formed on the surface of a magnetic tape by a rotating drum on which two types of azimuth heads are mounted, means for extracting a signal used for high-speed reproduction from a normal recording signal, and used for high-speed reproduction A unit for recording a signal in a predetermined area of a predetermined track; a unit for recording a signal for identifying a track on which a signal used for high-speed playback is recorded; and a unit for reproducing a signal for identifying a track. When performing high-speed reproduction at a multiple speed (n-times speed), a signal used for the high-speed reproduction is recorded on a predetermined azimuth track for each multiple speed number , and a signal for low-speed double speed reproduction is recorded. The region A of the azimuth track and the region B of the second azimuth track for recording a signal for high-speed double-speed reproduction are set, and the size of the region is region A> region B. Region A, and a magnetic recording and reproducing apparatus and providing a copy area for recording the same data to both ends of the region B. Of the signals used for high-speed playback at even multiple speeds, a low-speed playback signal is recorded in one area of one track per head scan in the first azimuth track area. 2. A magnetic recording / reproducing apparatus according to claim 1, wherein a reproduction signal is recorded in a plurality of areas of one track for each scanning of the head in the area of the second azimuth track. Of the signals used for high-speed playback at even multiple speeds, a low-speed playback signal is recorded in one area of one track per head scan in the first azimuth track area. A reproduction signal is recorded in a plurality of areas of one track for each scanning of the head in the second azimuth track area, and the head scans the tracking signal area and the subcode area at the time of each multiple speed reproduction. The magnetic recording / reproducing apparatus according to claim 1 or 2, wherein Slow speed reproduction, and a region for recording fast speed data for reproducing A, and any one of claims 1 to 3, characterized in that providing a copy area in five sync blocks provided at both ends of region B The magnetic recording / reproducing apparatus as described. When the area A of the first azimuth track for recording the signal for low-speed double-speed reproduction is divided into approximately five equal parts, and the areas are defined as A1, A2, A3, A4, and A5, they are recorded in the areas A1 and A5. When the same signal is used and the area B of the second azimuth track for recording the signal for high speed double speed reproduction is divided into approximately three equal parts, and these areas are designated as B1, B2, and B3, the area B1 and the area magnetic recording and reproducing apparatus according to any one of claims 1 to 3, characterized in that the same signal a signal to be recorded to B3. The high-speed reproduction data is recorded at a trajectory position intermediate between head scanning trajectories of 2 heads having 2 kinds of azimuth, 2 heads of 2n speed, and 4 heads of speed (n is an even number). Item 5. The magnetic recording / reproducing apparatus according to any one of Items 4 to 5 . Slow speed reproduction, and high-speed double-speed area for recording data for reproduction A, and claims, characterized in that the copy area is provided at both ends of the region B provided so much outside of the tape 1 to claim 4, and claims 7. The magnetic recording / reproducing apparatus according to any one of 6 above. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein a signal used for at least an even multiple speed, a forward high speed double speed, and a reverse high speed double speed is recorded as a signal used for high speed reproduction. Of the signals used for high-speed playback at even multiple speeds, a low-speed playback signal is recorded in one area of one track per head scan in the first azimuth track area, and forward Are recorded in a plurality of areas of one track for each scanning of the head in the second azimuth track area, and signals for high speed double speed reproduction in the reverse direction are recorded in the second azimuth area. magnetic recording and reproducing apparatus according to claim 1 or claim 5, wherein the recording into regions of one track per scan head of the track area. Of the signals used for high-speed playback at even multiple speeds, a low-speed playback signal is recorded in one area of one track per head scan in the first azimuth track area. A signal for reproduction is recorded in a plurality of areas of one track for each scanning of the head in the area of the second azimuth track, and a signal for high speed double speed reproduction in the reverse direction is recorded in the area of the second azimuth track. claim 1 is recorded into a plurality of areas of one track per scan head, the head at each speed multiplier playback is characterized in that scanning tracking signal area, and a subcode area of claim 8, A magnetic recording / reproducing apparatus according to claim 9 . In the first azimuth track, an area A for recording a signal for low-speed double-speed reproduction is provided, and in the subsequent second azimuth track, an area B for recording a signal for low-speed double-speed reproduction is provided. was approximately twice the length of the region a, according to claim 1, and claims, characterized in that the same position within the track approximately in the area a around the position in the track of the center of the area B magnetic recording and reproducing apparatus according to any one of 8 through claim 10. 2. The region B is divided into approximately three parts, and when the region is defined as B1, B2, B3, the signal recorded in the region A is the same as the signal recorded in the region B1 and the region B3. And a magnetic recording / reproducing apparatus according to any one of claims 8 to 11 . The signal to be recorded for each speed to perform high-speed playback constitute the respective speed dedicated signals of a plurality of playback speed to one of claims 1 to 12, characterized in that recorded at different locations on tape The magnetic recording / reproducing apparatus as described. In a continuous M number of tracks, a high-speed reproduction signal at a predetermined speed is arranged at a predetermined position of a predetermined track, and recording is repeatedly performed in units of the arrangement of the signals of the M track, and a plurality of M × n 14. The magnetic recording / reproducing apparatus according to claim 13 , wherein a signal for high speed reproduction at a double speed (where n is a natural number) is recorded, and each speed signal is repeatedly recorded 2 × n times in units of M tracks. 15. The magnetic recording / reproducing apparatus according to claim 14, wherein M is set to 4, and a pilot signal obtained by repeating three types of frequency signals f0, f1, f0, f2 is used for controlling the tape speed. 16. The magnetic recording / reproducing apparatus according to claim 15 , wherein an even-numbered speed reproduction of M × n times or less is performed using a signal recorded for M × n speed reproduction. A region A of the first azimuth track for recording a signal for low speed double speed reproduction and a region B of the second azimuth track for recording a signal for high speed double speed reproduction are provided at both ends of the region A and the region B. When A1, A2, and B1, B2 are provided as copy areas for recording the same data, ECC data and images for error correction are respectively used for signals recorded in the copy areas A1 and A2 at both ends of the area A. The same signal composed of data, and the signals recorded in the copy areas B1 and B2 at both ends of the area B are the same signal composed of ECC data and image data for error correction, respectively. Item 2. A magnetic recording / reproducing apparatus according to Item 1 . A region A of the first azimuth track for recording a signal for low speed double speed reproduction and a region B of the second azimuth track for recording a signal for high speed double speed reproduction are provided at both ends of the region A and the region B. When A1, A2, and B1, B2 are provided as copy areas for recording the same data, the signals recorded in the copy areas A1 and A2 at both ends of the area A include the same image data as different ECC data. signal to the magnetic recording reproducing apparatus according to claim 1, characterized in that the signal containing the same image data signals to be recorded and different ECC data to the copy area B1, and B2 at both ends of the region B. A region A of the first azimuth track for recording a signal for low speed double speed reproduction and a region B of the second azimuth track for recording a signal for high speed double speed reproduction are provided at both ends of the region A and the region B. When A1, A2, and B1, B2 are provided as copy areas for recording the same data, the signals recorded in the copy areas A1 and A2 at both ends of the area A are set as different ECC data, and the copy area B1 in the area B and a magnetic recording reproducing apparatus according to claim 1, characterized in that a different ECC data signals to be recorded in B2. When the area A of the first azimuth track for recording the signal for low-speed double-speed reproduction is divided into approximately five equal parts, and the areas are defined as A1, A2, A3, A4, and A5, they are recorded in the areas A1 and A5. The signal to be corrected is the same signal including ECC data for error correction and image data, and the region B of the second azimuth track for recording the signal for high-speed double-speed reproduction is divided into approximately three equal parts. 6. The magnetic recording / reproducing apparatus according to claim 1 or 5, wherein the signals to be recorded in the areas B1 and B3 are the same signals including ECC data and image data when the area is B2 and B3. . When the area A of the first azimuth track for recording the signal for low-speed double-speed reproduction is divided into approximately five equal parts, and the areas are defined as A1, A2, A3, A4, and A5, they are recorded in the areas A1 and A5. The signal to be processed is a signal including the same image data as different ECC data, and the area B of the second azimuth track for recording the signal for high speed double speed reproduction is divided into approximately three equal parts, and the areas are divided into B1, 2, B3 and when the regions B1, and a magnetic recording and reproducing apparatus according to claim 1 or claim 5 further characterized in that a signal containing the same image data and different ECC data signals to be recorded to the region B3. When the area A of the first azimuth track for recording the signal for low-speed double-speed reproduction is divided into approximately five equal parts, and the areas are defined as A1, A2, A3, A4, and A5, they are recorded in the areas A1 and A5. When the signal to be processed is different ECC data, the area B of the second azimuth track for recording the signal for high-speed reproduction is divided into approximately three parts, and the areas B1, B2, B3 are divided into areas B1, and magnetic recording and reproducing apparatus according to claim 1 or claim 5 further characterized in that a different ECC data signals to be recorded to the region B3.

Images