JPH0612787A - Digital magnetic recording and reproducing device and cassette digital magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To reduce equipment cost and running cost by sharing a VTR mechanism, a circuit and a cassette tape at the time of recording and reproducing the image signal of the HDTV system of different system from each other. CONSTITUTION:After a component video signal is converted by an A/C converter 118/120, an effective image is picked up by an effective image picking device 121 and sent to an ECC encoder 122. After an AUDIO signal 117 is converted by an A/D converter 123, the signal is encoded by the encoder 124 and sent to the encoder 122. A reference synchronizing signal (SYNC) 116 is sent to a timing pulse generator 122 through a switch 125 and a necessary pulse is generated. By the SW 125, the SYNC is selected and the external SYNC is selected at the reproducing time. The ECC 122 is encoded for correcting a code error in a recording and reproducing process, and addition data from an addition data generator 127 is encoded for recording together with video and audio data. The output of the ECC 122 is sent to a recording amplifier group 14 after modulated by a modulator 128.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital magnetic recording / reproducing apparatus for recording / reproducing signals of a plurality of different television standards, and more particularly to a cassette digital magnetic recording apparatus compatible with HDTV systems of Japan, USA and Europe. The present invention relates to a recording / reproducing device.

[0002]

2. Description of the Related Art HDTV, which provides higher definition images than the current television, is being tested by Japan before Japan.

The Japanese HDTV system is called high-definition and has 1125 scanning lines and a field frequency of 60 Hz.
Was decided.

On the other hand, in Europe and the United States, it is planned to introduce an HDTV of a system different from the Japanese system. The European system has 1250 scanning lines and field frequency 50 Hz, and the American system has 1050 scanning lines and field frequency. 5
The 9.94 Hz plan is influential.

[0005] As described above, when the television systems are different and the equipments for producing and transmitting programs are different, each equipment has to be developed and manufactured individually, resulting in high cost by itself. turn into. Also, in order to show software produced by other methods, it is necessary to prepare a VTR or telecine suitable for each method, convert the signal with the format changing device, and re-record, which is troublesome. The cost will be heavy.

[0006] In the first place, the VTR is one of the main equipments for production and transmission, and since the VTR for broadcasting is generally expensive, a tape transport, a signal processing circuit and a cassette common to different HDTV systems are used. If tapes and tapes can be used, equipment costs and running costs will be reduced, which will be a great benefit to users. Further, if the tape recorded by another method on the same VTR can be reproduced, there is an advantage that the program conversion between countries can be easily performed at a low cost.

In the conventional magnetic recording / reproducing apparatus, however, there is no apparatus capable of recording / reproducing high-definition images of different HDTV systems by a common mechanism, let alone digital recording on a cassette tape.

[0008]

As described above, in the past,
There was no device that digitally recorded images of different HDTV systems with a common mechanism or cassette tape.

In view of the above-mentioned problems, the present invention uses the same mechanism, the same cassette, and the same tape, and different H
It is an object of the present invention to provide a cassette type digital magnetic recording / reproducing apparatus for recording / reproducing DTV system signals.

[0010]

In order to solve the above-mentioned problems, the present invention provides high-definition information composed of video and audio on a magnetic recording medium in units of N (N> 0) bits. First recording / reproducing in an N × L (L> 0) area
Recording / reproducing method and second recording for recording / reproducing in an M × K (K> 0) area in units of M (M> N) bits,
In a digital magnetic recording / reproducing apparatus for recording / reproducing the high-definition information by a reproducing method, in an area for recording the N-bit and M-bit information amounts on the magnetic recording medium,
Recording means for recording information different from the high definition information,
A recording means for reproducing information different from the high-definition information recorded by the recording means, wherein the recording means
Information different from the high definition information is recorded in at least one area between the N-bit unit and the M-bit unit.

Further, when a common cassette is used, the cassette is inserted into a housing as a means for discriminating the different systems, and the housing of the cassette is mounted on the magnetic recording medium in the cassette. In a cassette digital magnetic recording / reproducing apparatus for recording / reproducing high-definition information consisting of video and audio according to identification information for identifying a plurality of types of recording / reproducing methods on a recording medium, an identification attached to the casing of the cassette. An identification information reading means for slidingly reading information, and a recording / reproducing method selecting means for selecting one kind of recording / reproducing method from the recording / reproducing method according to the identification information by the identification information reading means are provided. The reading operation of the identification information reading means is performed when the cassette is inserted into the housing.

Further, as means for distinguishing different systems when the tape is played back or when fast-forward is rewound, high-definition information consisting of video and audio is recorded on the magnetic recording medium and the amount of information is A.
Digital magnetic recording / reproducing the high-definition information by a first recording / reproducing method for recording / reproducing (A> 0) bits and a second recording / reproducing method for recording / reproducing B (B> A) bits. In the recording / reproducing apparatus, the high-definition recording,
Identification information recording means for recording reproduction / reproduction method identification information for selecting whether the reproduction method is the first recording / reproduction method or the second recording / reproduction method, and identification for reproducing the identification information by the identification information recording means. The information recording means comprises information reproducing means and recording / reproducing means for recording / reproducing by the first recording / reproducing method or the second recording / reproducing method according to the identification information by the identification information reproducing means. The means records the recording / reproducing method identification information on the magnetic recording medium.

[0013]

According to the present invention, the amount of information of the HDTV video signal of the 1125/60 system in Japan is larger than that of the 1250/50 system in Europe and the 1050 / 55.94 system in the United States. Therefore, if the recording / reproducing mechanism is the same and the format on the tape is substantially the same so that the 1125/60 system can be recorded, the 1250/50 system and the 1050 / system can be recorded.
In the 59.94 system, the recording area becomes redundant. Therefore, another useful signal is recorded in this redundant area. Since the HDTV signal has a large amount of information, the signal of one field is divided into a plurality of tracks and recorded. At this time, the audio signal contains AUDIO information per field,
The video information for one field is recorded in time division in a format that can be independently edited later on somewhere in the track group where the video information is recorded.

Editing is generally performed in units of frames or fields, but the tracks at the boundaries of frames or fields are easily damaged due to mechanical errors or defective tracking. Especially, the deterioration of the audio signal is easily detected. Therefore, the problem at the time of editing can be avoided by not recording the regular audio signal only in the track at the boundary of the frame or field and leaving it blank or recording another information signal.

Further, when a common cassette is used for recording and reproducing of different systems, it is preferable to automatically identify the system when the cassette is loaded into the VTR. In the present invention, the system identification information attached to the housing of the cassette is
At the time of insertion, the identification information reading means can be read and the recording / reproducing method selecting means can select an appropriate recording / reproducing method. As a result, the recording / reproducing method can be detected quickly, and the subsequent system settings can be performed quickly.

Besides, it is also possible to mix and record signals of different systems in the same cassette tape.
In this case, the identification by the cassette is not performed, and the Tape
The identification information is recorded on the identification information recording means. Then, at the time of reproduction, the recording / reproducing means is switched according to the identification information from the identification information reproducing means for judging the respective systems, and appropriate reproduction is executed. Further, by recording the identification information on the tape, even if the identification information on the cassette is set by mistake, the method can be identified quickly when the tape is reproduced or fast-forward rewind.

[0017]

EXAMPLE A first example of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a digital VTR for recording / reproducing an HDTV signal. On the rotating drum 11, there are 16 recording head groups 12 and 16 reproducing head groups 13.
Besides, an erase head (not shown) is provided. A recording amplifier group 14 for supplying a current to the recording head and a reproducing preamplifier group 15 for amplifying a signal from the reproducing head are also provided on the rotating drum 11.

The tape 17 in the cassette 16 is pulled out from the supply reel 18 and is wound around the rotary drum 11 at approximately 1 mm.
After being wound in the range of 80 °, it is wound on the take-up reel 9.

During recording and reproduction, the tape 17 is transported at a constant speed by the rotation of the capstan 110.

On the tape transport, an erasing head 112 and a recording / reproducing head 1 are provided for recording / reproducing cue audio, time code and control track signals.
11 is provided.

Analog component HDTV signals are externally connected to the video input terminals 113 to 115 of the VTR. Further, the reference synchronizing signal (S
An analog audio signal (8 channels) is connected to the input terminal 117 of YNC). Here, the input signal and the output signal are described as analog format, but it is of course possible to connect to an external device with a digital signal.

The input component video signal is A
After being converted into a digital signal by the / D converter 118/120, a valid image is extracted by the valid image extractor 121 and sent to the ECC encoder 122 as described later. Also, the AUDIO signal 117 is the A / D converter 1
After being converted into a digital signal in 23, the AUDIO encoder 124 is encoded by the audio signal and then ECC
It is sent to the encoder 122. On the other hand, the SyNC signal is sent through the switch 125 to the timing pulse generator 12
6 to generate the timing pulses required for signal processing. The SW 125 selects the SYNC that is normally added to the input video signal when recording or editing, and selects the external reference synchronizing signal (SYNC) when reproducing.

The ECC encoder 122 performs error correction coding for correcting a code error generated in the recording / reproducing process, and a code for recording the additional data sent from the additional data generator 127 together with the video and audio data. To convert. The data output from the ECC encoder 122 is 8-channel data corresponding to the recording head. The data is digitally modulated by the modulator 128 into a signal suitable for recording, and then a synchronization signal generated by the SYNC information generator 130. And an address signal are added by the adder 129, and are sent to the recording amplifier group 14 on the rotary drum through a rotary transformer (not shown).

In addition to recording and reproduction, operations such as fast forward and rewind, operations of additional data, setting of time code, etc.
Control panel 131 mounted on the front of TR
The control circuit 132 gives a control signal to a necessary circuit according to the operation content of the operator.

On the other hand, when reproducing the signal recorded on the tape, the signal read by the reproducing head group 13 is amplified by the preamplifier group 15 and passed through the rotary transformer (not shown) to the equalizer / detector circuit 133. Sent. After the distortion received in the recording / reproducing process is compensated by the equalizer, binary digital data is detected by the detector. The sync detector 134 detects the synchronization information in the digital data, supplies it to the demodulator 135, and also supplies it to the ECC decoder 136 as a timing reference for the reproduced signal. The demodulator 135 performs the reverse operation of the modulator 128 to convert the recorded data into an information signal. The ECC decoder 136 corrects the error of the information signal, and then separates and reconstructs the video information signal, the AUDIO information signal, and the additional information signal, respectively. The AUDIO signal is sent to the AUDIO decoder 1
After a copy unique to AUDIO is made at 37, an analog signal is formed by the D / A converter 138 and output from the output terminal 139.

The video signal is generated by the video information generator 140.
After the synchronization information and the like are added, the D / A converters 141 to 141-
Converted to an analog signal at 143 and output terminals 144 to 14
It is output to the outside through 6.

The video monitor signal is added with character information and the like from the D / A converters 141 to 143 through the character generator 147, and then the monitor output terminal 148.
Through 150 to the monitor 151.

On the other hand, the additional information is the additional information decoder 152.
Is decoded by and sent to the control circuit 132 once,
Display the contents on the display on the control panel, display on the monitor screen sent to the character generator 147, give data to an external personal computer,
Used to control the operating mode of R.

Simultaneously with recording / reproducing of video data or audio data, a CUE audio signal, a time code signal indicating time information, and a control track signal serving as a tracking reference are recorded / reproduced using the fixed head 111. As the CUE audio signal, in addition to the signal input from the outside, it is possible to select and record a signal of an arbitrary number of channels among audio signals for digital recording input to the AUDIO input terminal 117, and reproduce the digital audio. During variable speed playback (fast forward, rewind, slow, etc.) that cannot be performed, it is possible to search by voice and to find the beginning.

Signal processing of these linear tracks is performed by TC
/ CTL / CUE recording / reproducing circuit 153.

The rotation of the rotary drum 11, the rotation of the capstan 110, and the rotation of the supply reel 18 for driving the cassette tape are controlled by the servo circuit 154.

Although a time code signal is recorded on the linear track as time information for editing or searching, it cannot be read when the VTR is stopped or running slowly. Therefore, the time code is also recorded on the helical track and is used as the time code on the helical track when the time code on the linear track cannot be read.

In the conventional digital VTR, since the time code data was added to a part of the audio sector or the video sector of the recording signal and recorded, only the time code data could not be independently edited (post-recording). .
On the other hand, a VTR that digitally records HDTV (high-definition) signals of 1125/60 system has a data rate of 1.18.
Since it is extremely high at 8 Gbps and many high-performance audio channels are required, there is no room to provide an independently editable time code area on the helical track. Proposed in Europe for this digital VTR 1
If the 250/50 format HDTV signal or the 1050 / 59.94 format HDTV signal proposed in the US is recorded with a small change, the European and US formats are compared to the Japanese 1125/60 format. Since the image information data rate is low, it is possible to record the above independently editable time code signal and other information signals in the redundant recording area.

In the first embodiment, N tracks are set as one segment, and the first HDTV system in which the video data recorded in each segment is P bits and Q bits (P> Q). In the digital VTR capable of recording the second HDTV system, the second HDTV
A plurality of HDTVs characterized by recording time code data configured to be independently erasable and rewritable in at least a part of the one segment when recording the system.
The signal is recorded.

Here, the first HDTV system is 1125.
/ 60, and the second HDTV system is 1250/50.

The first HDTV system 1125 /
60, and the second HDTV system is 1050 / 59.94.

In the first embodiment, the tape is wound around the head drum by about 180 degrees, and the tape is wound on the head drum 16 times.
Recording is performed by providing individual recording heads. The rotation speed of the drum is 150 rotations per second, and 8 rotations per half rotation of the drum.
A 1125/60 high-definition signal is recorded in 5 fields in 1 field with a track of the book as 1 segment.

FIG. 2 is a diagram showing the track arrangement on the tape in a simplified manner.
Seven tracks a to 21g are dedicated video tracks, and one track 22 is a video / audio mixed track. This track 2 has 8 channel audio sector,
Each sector is partitioned by an edit gap and is configured to be independently editable.

FIG. 3A is a diagram showing an HDTV signal to be recorded for one frame. The video signal is a component signal consisting of a luminance signal and two color signals. The luminance signal is sampled at 74.25 MHz and the color signal at 37.125 MHz (quantization accuracy is 8 bits), and the number of horizontal samples is the luminance signal. 2200, 110 color signals each
It is 0. The numbers in parentheses in the figure represent color signals.
Also, there are 1125 lines in the vertical direction. This VT
In R, the effective pixel 3 excluding the blanking period 1 among these
Only 2 is recorded, and 1920 (96
0) Sample, 1035 lines in the vertical direction. Also, 5 lines are added and recorded as a data area that can be freely defined and used by the user. The recording data of one frame is divided into field data 33a and 33b of 520 lines each as shown in FIG.
Data of one field is recorded in a time of two and a half rotations of the drum (5 segments).

These data are divided into 8 channels after being coded for error correction by the ECC encoder 122 of FIG. 1 and channel-coded by the modulator 128 to obtain the synchronization information from the synchronization information generator 130. 16 recording heads 1 through the recording amplifier 14
It is recorded on tape using 2. As shown in FIG. 4, the video data recorded on the track has 8720 bits as a symbol, which is 60720 symbols in the video dedicated track 41 and 46000 symbols in the video / audio mixed track 42. The recorded video data includes redundant bits such as an error correction code and an address. Before and after each track, preamble 43 and post ampoule 4
There are 4 and there are 8 more in the video / audio mixed track.
Audio sectors 45a to 45h for channels are arranged so as to be sandwiched between edit gaps 46a and 46b. Each audio sector also has its own preamble 47 and postamble 48.

An embodiment in which signals of the HDTV system proposed in Europe and the US are recorded on this VTR will be described below.

Europe has proposed the 1250/50 system. That is, the number of lines in one frame is 1125 and the field frequency is 50 Hz. FIG. 5A shows a 1-frame video signal, and the luminance signal is 72 MHz.
Two color signals are sampled at 36MHz (quantization accuracy is 8
The number of horizontal samples is 230 for the luminance signal.
4 and 1152 for each color signal. The numbers in parentheses in the figure represent color signals. 1250 in the vertical direction
It has become a line. In this VTR, only the effective pixels 52 except for the blanking period 51 are recorded, and 1920 (960) samples in the horizontal direction and 1152 lines in the vertical direction. In addition, 48 lines are added and recorded as a data area that can be freely defined and used by the user. The recorded data of this one frame is shown in FIG.
As shown in (b), it is divided into field data 53a and 53b of 600 lines each, and one field of data is recorded during the time of three rotations of the drum (6 segments).
The total number of symbols that can be recorded per recording track is 1.
Same as 125/60. FIG. 6 shows the data arrangement on the track in the 1250 system. The number of symbols to be recorded on the video-only track 1 is 60384 symbols compared to 60720 symbols of the 1125 system. Difference from the 1125 system The 336 symbols 62 are added to the track margin 63, but can be used differently. On the other hand, the video data to be recorded on the video / audio mixed track is 1
319 compared to 46000 symbols in the 125 system
There are 68 symbols, and an open space 65 for 14032 symbols is generated. The open space 65 is newly provided with time code data 67 and user data 68 for the edit gaps 66a and 66b. Preambles 69a and 69b and postambles 610a and 610b are added before and after each data. In the time code data section, the same 32-bit time information and 32-bit time information per frame that are recorded on the linear track are subjected to error correction coding, and the same code configuration as that of video data or audio data is used. Record times. User data is also encoded and recorded a plurality of times in the same manner as video data, thereby increasing the reliability of information. The identification information of each data is recorded in the preambles 69a and 69b and is also included in the code configuration of the data.

In this embodiment, the time code data and the user data are arranged as shown in FIG. 6, but the time code data and the user data are distributed and arranged in several places of the track within the limitation of the total number of symbols in one track. You can also do it. Also, the user data can be omitted, or the number of audio channels can be increased instead.

Next, 1050/5 proposed in the United States
An embodiment for recording a signal of the 9.94 system will be described.

The number of lines in one frame is 1050 and the field frequency is 59.94 Hz. The difference from the field frequency of 60 Hz is 0.1%, and a can be treated in the same manner as 60 Hz by lowering the drum rotation speed, tape speed, and recording data rate as VTR by 0.1%. FIG. 7A shows a video signal of one frame, in which a luminance signal is 72 MHz and two color signals are 36 M.
The number of samples in the horizontal direction is 2288 for chrominance signals and 1144 for chrominance signals. The numbers in parentheses in the figure represent color signals. There are 1050 lines in the vertical direction.
In this VTR, recording is performed only for the effective pixels 72 excluding the blanking period 71 in the VTR, and 1920 pixels in the horizontal direction.
(960) samples, 966 lines in the vertical direction.
Further, 34 lines are added and recorded as a data area that can be freely defined and used by the user. The recorded data of one frame is 500 as shown in FIG.
It is divided into field data 73a and 73b for each line, and one field of data is recorded in a time of two and a half rotations of the drum (5 segments). The total number of symbols that can be recorded per recording track is the same as 1125/60. FIG. 8 shows the data arrangement on the track in the 1050 system. The number of symbols recorded on the video-only track 81 is 5860, compared with 60720 symbols of the 1125 system.
8 symbols. The difference 2121 from the 1125 system is added to the track margin 83, but it can be used for another purpose. Particularly in the 1050 method, since the number of surplus symbols is large, it is possible to record time code data with an edit gap also on a video dedicated track.

On the other hand, the video data to be recorded on the video / audio mixed track is 31968 symbols, compared with 46000 symbols in the 1125 system, and 1403 symbols.
An open space 85 for two symbols is created. In this open space 85, edit gaps 86a and 86b, time code data 87 and user data 88 are provided as in the 1250 system. Preambles 89a, 89b and postambles 810a, 8 are placed before and after each data.
10b is added. The time code data and the user data are the same as in the 1250 system.

In this embodiment, the time code data and the user data are arranged as shown in FIG. 6 or FIG. 8. However, the recording data of the video dedicated track is reduced and a space is provided to record the time code data at one or several places. It is also possible. In this way, the time code recording area can be set freely within the range of the remaining data area within one segment.

In the above-described first embodiment, eight tracks are used as a unit. Although the AUDIO signal is concentrated and recorded on a specific one track in one segment, there may be other modes of recording the AUDIO signal. A second embodiment as one example of this will be described below.

In this example, it is assumed that the audio signal is recorded as shown in FIG. This figure shows a track pattern of one field in the case of the 1125/60 system. Reference numeral 901 is a video recording area, and 902 is an audio recording area. That is, audio recording areas are provided on all tracks, and audio signals of the same channel for one field are recorded on adjacent (4 tracks). In the case of the 1125/60 system and the 1050 / 59.94 system, audio signals of 10 channels (8 channels + option 2 channels) can be recorded. 125
12 channels (8 channels +
Audio signals of optional 4 channels) can be recorded.

Generally, during editing, a track error in the track width direction causes unerased tracks and erasure of adjacent non-edited tracks, and the error rate is apt to deteriorate in the tracks immediately before and after the editing point. Therefore, when editing is performed on a field-by-field basis, the track adjacent to the end of the field, that is, the edit point, is more likely to be damaged than other tracks. Therefore, in this example, the two audio channels arranged at the end of the field as shown in FIG.
It is assigned to P1 and OP2. The same content as an arbitrary audio channel may be recorded in this optional channel for backup.

FIG. 10 shows one channel of FIG. 9, that is, four channels.
3 is an enlarged view of an audio recording area of a track. The audio data is written twice, and the data E regarding the even sample is written in the tracks 903 and 905.
Data O relating to odd-numbered samples are recorded twice in 904 and 906, respectively.

In the case of this recording system, the same number of audio advance reproducing heads (used for audio editing) as reproducing heads are required. However, if attention is paid to the fact that the same data is written twice, the number of preceding playback heads can be halved compared to the number of playback heads by playing back only one of them in the case of preceding playback. .

At this time, which one of the data written twice is reproduced by the preceding reproducing head will be described. In the case of the recording methods of FIGS. 9 and 10, for example, when performing insert editing in audio channel units, adjacent four audio recording areas of the same channel are always rewritten at the same time. That is, of these 4 tracks, 2 at both ends
Since the tracks (903 and 906 in FIG. 10) are adjacent to the editing point, they are easily damaged by the editing due to the above-mentioned reasons, and the inner two tracks (904 and 905 in FIG. 10).
Is less susceptible to damage. Therefore, since it is highly possible that the two tracks on both ends adjacent to the edit point have a bad error rate, the preceding reproduction head may be attached so as to scan the inner two tracks, excluding the object of the preceding reproduction.

As described above, even when the audio recording areas are provided in all tracks as shown in FIG. 9, only one of the double-written data is preliminarily reproduced, and in particular, at that time, it is adjacent to the editing point. By not including these tracks in the pre-reproduction, the number of audio pre-reproduction heads can be reduced to half and the error of the pre-reproduced data can be minimized.

As the audio signal recording system, each system as shown in FIGS. 11 to 14 can be considered. 11 to 14 show 40 tracks for one field when 10-channel audio is recorded by the 1125/60 system, and the numbers in the figures show audio channel numbers. (1-a) to (1-d) of FIG. 11 are a system in which eight tracks are grouped together and audio of the same channel is recorded on eight adjacent tracks, and (2-a) to (2) of FIG.
13-b) and (3-a) to (3-d) of FIG. 13 are a method of grouping four tracks, and (4-a) to (14-a) of FIG.
(4-b) is a system in which an audio recording area is provided in a predetermined number of tracks out of 8 tracks. The example of FIG. 9 is shown in FIG.
2 corresponds to (2-a).

Next, an example of reproducing a tape recorded by a different method will be described.

In a digital VTR compatible with a plurality of systems (1125/60 system, 1050 / 59.94 system, 1250/50 system) having different numbers of scanning lines and field frequencies, these plural types of systems are switched. Set by If the system set by this switch, the system of the input reference signal, and the system identified from the tape are not the same system but different systems, it is impossible to reproduce the conventional image.
That is, when the content recorded on the tape is recorded by a different method (first method), the video cannot be reproduced and displayed on the monitor of the second method.

In the third embodiment, the contents of the image can be confirmed even with different systems, and the system conversion can be performed even with different systems for reproduction.

In other words, the third embodiment is a digital VTR having a mode for reproducing signals recorded by a plurality of methods in which at least one of the number of scanning lines and the field frequency is different, and a memory is provided in the reproducing circuit. It is characterized in that it has a mode for writing to the memory by a method corresponding to the first method and reading from the memory for a method corresponding to the second method.

The third embodiment of the present invention will be described below.

In this embodiment, consider a digital VTR which is divided into 8 channels and recorded. The number of tracks per field is 1125/60 and 1050/59.
The 94 system has 40 tracks and the 1250/50 system has 48 tracks. That is, the number of tracks per field of 1 channel is 1125/60 and 1050 /
59.94 system is 5 tracks, 1250/50 system is 6 tracks
Become a truck. The structure of the error correction code is completed within these 5 tracks (or 6 tracks).

FIG. 15 shows the data per field actually recorded in this embodiment. The number of recording lines per field is 1125/60 and 1050/59.
As shown in FIG. 15 (a), the 94 method is 520, 1250.
The / 50 system is set to 624 as shown in FIG.
The number of recording samples per line is the luminance signal 1920 and the color signal 960 regardless of the method.

This data is first divided into 8 channels. An error correction matrix as shown in FIG. 16 is formed for the data of each channel. That is, the C2 parity symbol of P2 symbols is added to this for the number of C2 information symbols 120, and the C1 parity symbol of P1 symbols is added to this for the number of C1 information symbols of 104. (For example, P1 = P2 = 8.) 1 in FIG.
An array of data for one field and one channel is shown. Figure 1
The error correction matrices of 6 are 1125/60 and 10
In the 50 / 59.94 system, 0 to 1 as shown in FIG.
In the case of 20 of 9 and the 1250/50 system, 24 of 0 to 23 are arranged as shown in FIG. (However, in FIG. 4, the C1 parity symbol is excluded.) This is shown in FIG.
As shown on the right side of (a) and (b), it is divided into 5 (or 6) in the column direction, and 1125/60 system and 1050 /
In the 59.94 system, 5 tracks of tracks 0 to 4 and 12
In the 50/50 system, recording is performed by dividing into 6 tracks 0 to 5. As a result, the amount of data per track is exactly the same regardless of the method.

Recording is performed in units of sync blocks. An ID (identification) code indicating a field number, a channel number, a track number, and a sync block number in the track is added to each sync block.

FIG. 18 is a diagram showing an outline of address allocation when the data of FIG. 17 is actually stored in the field memory. Basically, they are assigned in the order of address recording, that is, in the order of sync block ID.
18 and the 1050 / 50.94 system for 5 tracks as shown in FIG. 18A.
As shown in (b), addresses for 6 tracks are assigned.

The rule (shuffling) for arranging the data on the screen of FIG. 15 as shown in FIG. 17 is 1125.
/ 60 method and 2 methods of 1050 / 59.94 method and 12
This is different from the 50/50 system due to the difference in the number of recording lines and the difference in the number of error correction matrices. In addition, the correspondence between the data array of FIG. 17 and the recording order determined by the sync block ID in FIG.
The two methods of the 50 / 59.94 method and the 1250/50 method differ due to the difference in the number of error correction matrices and the difference in the number of recording tracks.

FIG. 19 is a block diagram of the error correction circuit 136 (and related circuits) in the reproducing circuit of the digital VTR of FIG. 1 in this embodiment. In FIG. 19, the reproduced signal input to the error correction circuit is subjected to C1 code decoding in the CI decompression circuit 1901 and written in one or a plurality of reproduced field memories 1902a to 1902d. At the time of writing, the write address (real address of the field memory) is combined in the write address generation circuit 1905 based on the ID detected by the ID detection circuit 1904. The roles of the reproduction field memories 1902a to 1902d are data storage during deshuffling (reverse conversion of shuffling) and variable speed reproduction. The C2 decoding circuit 1903 decodes the C2 code of the data read from any of the reproduction field memories, and the data is output from the error correction circuit. At this time, a read (deshuffling) address is generated from the read address generation circuit 1906. As described above, the method of generating the read address differs depending on the method.

The control is performed by the control circuit 1907, and the channel system (writing system) control signal 1924 and the video system (reading system) control signal 1925 are generated respectively. The output (video system) reference signal 1922 is given to the timing signal generation circuit 1909, and the timing signal is generated.
At the same time, the system identification result of the output reference signal 1922 is sent to the mode setting circuit 1908 and the servo reference signal 1923 is generated. Here, the basic clock frequency is different between the channel system and the video system. The channel system clock is the same regardless of the system, but the video system clock differs depending on the system due to the difference in the video sampling frequency.

Further, which method is recorded is identified from the contents of the longitudinal track and the helical track of the cassette body or the tape, and the method identification signal 19 of the tape content is identified.
21 is supplied to the mode setting circuit 1908. The mode setting circuit 1908 determines the operation mode of the VTR by referring to the system identification result of the system identification signal 1921 and the output reference signal 1922 and the setting made by the switch (not shown). Normally, if the switch setting is inconsistent with the reference signal and the system identification signal, correct reproduction cannot be performed, and therefore video output is prohibited. However, in the different system reproduction mode, the control circuit 1907 is operated so as to reproduce and display even when the contents of the tape and the output reference signal are different. That is, if the tape content is the first system, the channel system control signal 1924 corresponding to the first system is generated, and if the output signal 1922 is the second system, the video reference signal corresponding to the second system. 125 is generated. At this time, the timing signal generation circuit 109 generates the servo reference signal 1923 corresponding to the first method.

First, the operation of reproducing a tape of the same method as usual will be described. Here is 1125/6
An example of reproducing a 0-system tape will be described. 1125
A / 60 type 30 Hz output reference signal 1922 is externally given to the timing signal generation circuit 1909.
A 30 Hz servo reference signal 1923 is generated. The control circuit 1907 generates a channel system control signal 1924 and a video system control signal 1925 corresponding to the 1125/60 system.

FIG. 20 shows control of the four reproduction field memories 1902a to 1d (# 1 to # 4) during normal reproduction. In the figure, the reproduction reference signal (servo reference signal) and the output reference signal are phase-locked, and at this time, the reproduction data is supplied to the reproduction field memory at the timing shown in the figure. In the figure, “0” is the reproduction data of the even field,
"1" represents the reproduction data of the odd field. Further, W represents writing and R represents reading. The subscripts 0 and 1 represent an even field and an odd field. That is, for example, W0 means writing to the field memory only in the even field.

As shown in the figure, switching between writing and reading is performed in units of fields, and data is sequentially read from the four field memories # 1 to # 4 with four fields as a cycle. Writing is performed in the two field period before reading. 1125/6 based on ID when writing
A write address corresponding to the 0 method is generated. Further, a read address corresponding to the deshuffling method of the 1125/60 method is generated. As described above, writing and reading are normally performed on the reproducing field memory according to the same method.

Next, the case of reproducing tapes of different systems will be described. In this embodiment, the control method is changed before and after the reproduction field memory. Here 1125 /
The 60 system and the 1250/50 system will be described.

First, let us consider a case where the 1250/50 system is the first system and the tape recorded by this system is reproduced according to the 1125/60 system (second system). 1
The 125/60 type 30 Hz output reference signal 122 is externally supplied to the timing signal generation circuit 109, but a 25 Hz servo reference signal 123 is generated. This 25 Hz reference signal may be generated asynchronously with the 30 Hz external reference signal. (Also, in some cases, it is not necessary to give a servo reference signal in frame units, that is, framing control may not be performed.) In addition, in the processing before writing to the reproduction field memory,
If there is a part that differs depending on the system, the channel system control signal 124 is generated so as to follow the 1250/50 system. That is, for example, if the length of the sync block, the synchronization pattern, the modulation method, the processing of the ID, etc. differ depending on the method, the processing of that portion follows the 1250/50 method. The generation of the write address is also performed according to the 1250/50 method. However, in the case of the format of this embodiment, these are the same regardless of most methods.

Playback field memory 102a in this case
21 shows an example of one control from d to d. Switching between writing and reading control is performed in units of fields of the 1125/60 system. As in FIG. 20, the read field memory is switched in a 4-field cycle.
However, as can be seen from the figure, the field of the reproduction data gradually shifts with respect to the output reference signal in time.
Therefore, writing is always performed except for reading, and field IDs are not distinguished at the time of writing, and reproduction data of even and odd fields are written together. The processing after reading from the field memory is the second method,
That is, the video system control signal 1925 is generated so as to follow the 1125/60 system.

It can be considered that the above control is almost the same as the control during shuttle reproduction (high speed reproduction) in the digital VTR. However, in this case, the image quality (resolution) is degraded because the screens of a plurality of fields are displayed in a mixed state.
It should be noted that switching between writing and reading of the reproduction field memory may be performed in a time-division manner in clock units instead of field units.

Next, the reproduction field memory 1902a ...
FIG. 22 shows another control example of d. In this example, the same field is repeatedly reproduced. The value of the field ID detected by the ID detection circuit 104 determines whether or not the input of a certain field is completed, and the reproduction field memory to be read from in the next field is determined. For example, the field next to the point A in FIG. 22 is originally the order of reading from the field memory # 3, but since the reproduction data input to the field memory # 3 has not been completed, the reading from # 3 does not proceed and from # 2. Read again. Similarly, the field next to the point B is originally to be read from the field memory # 4, but since the reproduction data input to the field memory $ 4 is not completed, #
Reading from # 3 is performed without proceeding to reading from # 4.
That is, the same field reading is repeated once every six fields.

In this case, when the field of the output reference signal and the even field of the read field do not match, it is desirable to correct the height deviation in the vertical direction. In FIG. 22, since the even and odd of the read field is reversed between points A and B, the field correction signal becomes H level, and the vertical height shift of the field is corrected. It can be considered that the above control is almost the same as the control during slow motion reproduction in the digital VTR.

Next, consider the case where the 1125/60 system is the first system and the tape recorded by this system is reproduced according to the 1250/50 system (second system). The control signals etc. are the opposite of the previous example. Here, an example of performing field thinning is shown, which is the reverse of the case of FIG. The control of the reproduction field memories 1902a to 1902d at this time is shown in FIG. The value of the field ID detected by the ID detection circuit 1904 determines whether or not the input of a certain field is completed, and from which reproduction field memory the next field is read. For example, in Figure 2.
The field next to point C of 3 is originally field memory # 4.
However, since the reproduction data input to the next field memory # 1 has been completed, the reading from # 4 is skipped and the reading from # 1 is performed. Similarly,
The field next to point D is originally the order of reading from field memory # 2, but the next field memory # 3
Since the reproduction data input has been completed, the reading from # 2 is skipped and the reading from # 3 is performed. That is, field reading is thinned out once every five fields.

From point C to point D in FIG. 23, the even / odd of the read field is reversed, so the field correction signal becomes H level, and the vertical height shift of the field is corrected. In addition, from 1125/60 method to 1250/5
When converting to the 0 system and reproducing, control similar to shuttle reproduction may be performed as in the case of FIG.

In the above examples, the reference signals of the two systems are asynchronous or indefinite in phase, but they may be provided with a synchronous relationship by using a PLL circuit or the like. If they are synchronized, regular thinning of repeated fields can be easily performed without a circuit for judging the completion of input of the reproduction field.

In the embodiments of FIGS. 22 and 23 described above, simple method conversion such as field thinning and repetition was explained, but if more advanced method conversion such as field interpolation is performed, unnatural motion will occur. It goes without saying that the resolution will be resolved and the playback image quality will be improved. That is, an interpolated signal is obtained by calculation (linear interpolation or the like) of data read from two or more field memories. However, in this case, it is generally necessary to add a field memory.

The control when reading from the reproduction field memory according to the second method will be described in more detail. Further, since the number of effective samples in the horizontal direction is the same regardless of the method, there is no problem in reading within one line.
However, as described above, the number of effective lines is different for each of the multiple systems. Therefore, when the signal of the first method is displayed on the monitor of the second method, the first method is the second method.
If the number of lines is smaller than that of the above method, the lower part of the screen may be cut, and conversely if the number of lines is larger, unsightly noise data may be displayed at the lower part of the screen.

Therefore, when the number of lines of the monitor (second method) is large, the reading start line is offset from the reproduction field memory so that the displayed area is substantially in the center (that is, reading of the effective line). In addition to sending the start), so-called letterbox display may be performed by replacing the upper and lower parts with a black level or a gray level so as not to be unsightly. Conversely, when the number of lines of the monitor (second method) is small, the read start line is offset so that the top and bottom of the screen are cut evenly (that is, the read start of the effective line is started earlier).
Good.

However, at this time, the entire screen on the monitor may be a vertically compressed or expanded image. The same line may be repeatedly read or the read line may be thinned out so that the video is not compressed or expanded due to the excess or deficiency of the number of lines. Also, line interpolation (for example, linear interpolation) using data of two or more lines
You may go.

In the above description, the 1125/69 system and 12
Although the 50/50 system has been described as an example of the first and second systems, the same applies to the 1050 / 59.94 system and other systems. However, the conversion between the 1125/60 system and the 1050 / 59.94 system can be realized significantly easily if the difference of 0.1% in display speed is allowed.

As described above, by performing the same control as that of the shuttle reproduction or the slow reproduction, even if the tapes of different systems are used, sufficient contents can be confirmed without adding any hardware. Further, if it is desired to obtain a sufficient image quality even with a different system, a full-scale system conversion may be performed by providing a synchronization relationship between reference signals and performing field interpolation or line interpolation.

The present invention is not limited to the above-mentioned embodiments, but various applications are possible. For example, by using the shuffling field memory on the recording side, the recording may be performed while changing the system at the time of recording.

In the above embodiment, the number of recording lines and the number of C1 information symbols per field is 1125.
520, 104 and 1050/5 respectively in the / 60 system
The values are set to 500 and 100 in the 9.94 system and 600 and 100 in the 1250/50 system, and accordingly, the sync block length and the recording wavelength may be changed depending on the system.

Next, a method of identifying each method when the same cassette is used in different methods will be described.

In this embodiment, a bar code label, a magnetic card, a memory card, and a selection switch, which are provided with identification information for identifying a plurality of scanning line information on a cassette case, are provided to insert a cassette, attach a tape, or tape. Pickup means for obtaining the scanning line identification information at the time of traveling at the start end and the recording / reproducing signal processing circuit are switched by the scanning line identification information obtained by the scanning line identification information pickup means,
It is provided with a function of displaying scanning line information, a means for storing the obtained scanning line identification information, and a means for sending the identification information stored when the cassette is attached and detached to the scanning line information identification storage means for rewriting.

As a result, a plurality of scanning line type identification information storage means are provided on the cassette case or on the magnetic tape. By storing this information by identification, the recording or reproducing operation by the desired scanning line type is performed automatically. I can do it. Further, since the scanning line type identification information is stored, the scanning line type identification information can be displayed at any time by the take-out display function, and the scanning line type identification information accumulating means and the display means on the cassette case can be used for the cassette. Since the identification information stored at the time of attachment / detachment can be sent and rewritten, the scanning line identification information on the cassette case can be provided with redundancy.

The fourth embodiment will be described below with reference to the drawings.

In FIG. 15, when the scanning line system is different, a circuit (timing) for generating control timing of the cassette digital VTR from the recording system signal processing units 121, 122 and 127, the reproduction system signal processing units 136, 140 and 152 and the reference signal. The pulse generator 126) is switched to a circuit operation corresponding to each scanning line system by a control signal from the control circuit 132 by the scanning line system identification method described below.

FIG. 24 is a block diagram showing a portion related to the identification of the scanning line system in FIG. Hereinafter, embodiments of the scanning line type identification and display method will be described in order. First, an embodiment of a scanning line type identification method using a bar code label will be described. FIG. 25 shows the cassette insertion port 15 of FIG.
5 is inserted by the laser detector 2502 mounted on the bucket 2503 when the cassette 16 having the bar code label 2501 is inserted.
FIG. 9 is a diagram showing an example of reading the scanning line identification information in which the scanning line method is printed and printed in advance. In the figure, when the cassette is inserted, the detection circuit 2 is detected only when the cassette 16 is inserted by the control signal from the control circuit 132.
504 is activated to read the barcode information. The identification information detected by the detection circuit 2504 is taken into the control circuit 132, and the circuit operation of each scanning line system of the recording signal processing circuit 2400, the reproduction signal processing circuit 2401, the timing generation circuit 126 and the scanning line display circuit 2405 of FIG. Circuit switching signal corresponding to. Since this identification information is stored until the cassette is ejected or replaced with another cassette, each scanning line system can be confirmed at any time by the display function described later. As the identification information, the Japanese method 112 of the scanning line method is used.
A simple 2-bit code is sufficient because it only identifies 3 types: 5/60, American system 1959 / 59.94, and European system 1250/60. Also barcode label 25
Since the 01 barcode is difficult to read with human eyes, direct text information is printed, and the barcode label 2501 and laser detector 2502 are used for the cassette 1
It goes without saying that the mounting position on 6 is not restricted. FIG. 26 shows a method using the magnetic card 2600 instead of the above-mentioned bar code label 2501 and FIG. 26 shows a method using the optical card 2700 as an example of another means for identifying the scanning line system when the cassette is inserted. 27
Is. In these two cases, since the identification information is stored by different means, the detector and the hardware circuit of the detection circuit are only different from the embodiment using the bar code label 2501 in FIG. .

In the embodiment described above, when the cassette is inserted, the identification method of the embodiment described below is an embodiment in which the scanning line method is identified after the cassette is mounted. FIG. 28 shows an embodiment in which a memory card 600 is used as a means for accumulating identification information. The scanning line identification information stored in the memory of the memory card 2800 is stored in the cassette 16 when the cassette 16 is completely inserted and then mounted in the cassette frame.
The tangential portion of the attached memory card 2800 on the bottom surface of the memory card comes into contact with the memory card contact 2801 attached to the cassette frame, the memory control circuit 2802 starts to operate by the control signal from the control circuit 132, and the scanning line identification information is sent by the memory handshake signal. Are taken into the control circuit 132. PR as a memory chip to be mounted in a memory card
Any of OM, rewritable EEPROM, and CMOS RAM with backup function may be used. After the scanning line identification information is fetched by the control circuit 132, the description is omitted because it is the same as the above description.

As another means for identifying the scanning line system after the cassette is mounted, the identification method described below is an embodiment using mechanical identification means in addition to the above-mentioned electronic identification method. Figure 2
9 is a rotary selection switch 29 attached to the cassette 16
00 or a slide plate 2903 is a diagram showing an embodiment in which the scanning line method is identified by a slide type selection switch 2901. The detection of the switch position is performed by the detection device 2904. However, as shown in FIG. 30, the contact 30 of the pickup is obtained by the method using the conductor plate 302 shown in FIG.
3 is in contact with the conductor portion (hatched portion) of the conductor plate 302, the detection by the reflector 304 and the optical sensor 305 shown in (b), and the height of the groove using the cam 306 shown in (c). There is a means for identifying the scanning line system by the position sensor 307. In each of the three methods, the identification information is taken out by the mechanical detecting means and converted into an electric signal, and the scanning line identification information is taken into the control circuit 132 through the detection device 2904. After being imported, the description is the same as the above description and will be omitted. Sliding selection switch 29
The description of 01 is omitted because the rotary plate 301 shown in FIG. 30 only changes from a round type to a horizontal type. The selection switches 2900 and 2901 are the selector switching device 2
By 905, switching can be performed according to a control signal from the outside.

The content of the embodiment described so far has described the method of fixing and identifying one of the three scanning line methods, but there is also the second method of not fixing. This method can be achieved by switching the scanning line system for recording / reproducing at an arbitrary position on the cassette tape or by adding the fourth free scanning line system information to the scanning line identification information by a method of recording / reproducing by an arbitrary scanning line system. . The scanning line system designation in the free scanning line system is switchable by a switch on the operator control panel 131 in FIG. 1 or a switch (not shown) mounted in the cassette VTR, and is a circuit corresponding to the scanning line system for recording and reproducing. Switch to operation. Also, the scanning line identification information switchable can be changed to the captured line before the cassette mounting is completed and the recording / reproducing operation is started.

Next, an embodiment of the display function of which scanning line system the recording / reproducing is performed on the cassette mounted on the VTR will be described. The scanning line memory circuit 2404 in FIG.
The scanning line display device 2405 for allowing the operator to recognize the scanning line system information stored in the first means is, as the first means shown in FIG. Display, Indicator or Pix Moni
It is displayed on the tor 151. Next, as a second means, FIG.
In the embodiment shown in (1), a liquid crystal display (LCD display) 3100 is mounted on the cassette case 16 and a display means is provided on the cassette itself for displaying.
The power source of the drive circuit 3102 of the liquid crystal display 3100 may be either a micro battery or a solar cell. As a third means, the embodiment shown in FIG.
This is an example showing that the scanning line method is recognized by the voice from the speaker 3201 by 0. For example, Japanese 1125/60 is Japanese, US 1050 / 59.94 is American, and European 12
If 20/50 is German or French, the distinction between scanning line systems is obvious. It should be noted that the switching of the voice may be automatically switched by each method or may be designated by the user. Regardless of which method is used, it is possible to specify that the language should be converted into a predetermined language and then output, or the translated text can be inserted as a supermarket on the screen without changing the language.

Although the embodiments described above relate to the scanning line type display, the embodiments described below are for the function of rewriting the scanning line identification information attached to the cassette case. When the scan line method is switchably selected by the switch on the operator control panel 131 of FIG. 1 or the switch mounted in the cassette VTR by the second method, the magnetic card of FIG. 27, the optical card of FIG. 27, FIG.
In the case of the memory card of No. 8, the scanning line identification information is rewritten, and in the case of the selection switch shown in FIG. 29, the position of the scanning line identification information is changed by the rotating mechanism shown in FIG. Of course, the liquid crystal display (LCD display) of FIG. 31 is also rewritten. However, the barcode label of FIG. 25 is displayed on the operator control panel 131 shown in FIG. 1 or the Pix Monitor 151 displays a barcode label replacement message, and in this case only, the scan line identification information may be automatically rewritten. It can't be done manually. Since magnetic cards, optical cards and memory cards have a large memory capacity, not only scanning line identification information but also additional information such as recording date and title can be entered.

Next, an embodiment will be described in which identification information is recorded on a tape and read at a variable speed during reproduction of the tape.

One method is to record the system identification code in the subcode area of the same helical track as the video,
It is conceivable to read the code during playback to determine the recording mode. However, even if the playback speed can be correctly identified at the standard playback speed, the playback head does not work in slow playback or high-speed playback (shuttle playback), which are indispensable operation modes for VTRs. Since the recording track is slanted, the identification code recorded on the helical track cannot always be read correctly.

By the way, the discrimination of the recording signal is the important information which is ranked the highest in the operation mode of the VTR, and it is necessary to always discriminate it stably and correctly. I mean,
If this judgment stops, it will go far beyond the area where the quality of the reproduced video deteriorates and it will become a mess. Expensive HD
There is a risk of destroying TV software.

The purpose of this embodiment is to provide a stable reproduced image in any operation mode by making stable and accurate determination of the recording mode during the special reproduction.

The first embodiment is an embodiment in which the scanning line identification information is recorded and reproduced on the cue track of the long track on the magnetic tape shown in FIG. In the case of a commercial VTR, a video and audio test signal and a title are always inserted at the beginning of the tape. An identification signal is put in the cue track of this portion for recording and reproduction. FIG. 33 is a diagram showing this embodiment. First, as the scanning line identification information at the time of recording, for example, as shown in FIG.
(A) 1 KHz, (b) 5 KHz, (c) 10 shown in
Among the signals from the three kinds of KHz oscillation circuits 3300, one kind is selected by the selection circuit 3301 by the control signal from the control circuit 32 which is issued only when the tape start end recording, and the scanning line identification information is recorded in the cue track. . At the time of reproduction, the scanning line identification information recorded in the cue track is obtained by the signal identification circuit 1202 by the control signal from the control circuit 32 which is issued only when the beginning of the tape is reproduced. In this example, the scanning line identification information is a sine wave of 1 KHz, 5 KHz, and 10 KHz, but any combination of waveforms that can be distinguished may be used.

As described above, according to the present invention, the corresponding circuit operation can be automatically performed by reading the scanning line identification information attached on the cassette case or the scanning line identification information on the cue track.

In the next embodiment, the identification signal is recorded on the control track shown in FIG.

That is, the identification signal indicating the type of the input video signal is recorded on the longitudinal track in the tape running direction by being superimposed on the control track signal having the frame frequency of the video signal or an integral multiple of the frame frequency. .

At this time, the frame frequency signal and the identification signal indicating the type of the input video signal are alternately multiplexed. Further, the frame frequency and the identification signal frequency have an integer ratio relationship. Further, the frequency of the identification signal to be multiplexed is set to the greatest common divisor 1 / N of different frame frequencies corresponding to different video signals.
(N: integer).

As another method, the number of pulses of the identification signal to be multiplexed corresponding to different video signals is changed and recorded.

In the present embodiment, in order to identify three kinds of video signals having frame frequencies of 30 Hz, 25 Hz and 59.94 / 2 Hz, respectively, each video signal is recorded in the control track signal which is conventionally recorded in the longitudinal direction of the tape. The identification signals with different frequencies are intermittently multiplexed corresponding to the above. FIG. 35 shows the TC / CTL / CU of this embodiment.
The block diagram of the E recording / reproducing circuit 153 is shown. Oscillation circuit 1
The oscillation frequency of (15301) is 600 Hz, and its output a1 is frequency divider circuit 1 (15302) and frequency divider circuit 2 (1
5304). The frequency divider circuit 1 has an oscillator circuit output a
A 120 Hz pulse signal b1 obtained by dividing 1 into 1/5, a 60 Hz pulse signal b2 obtained by further dividing by 1 and a pulse signal b3 obtained by further dividing by 1 are output. 120Hz
The pulse signal b1 of 60 Hz and the pulse signal of 60 Hz are the switching circuit 1
By (15303), switching is performed by the first frame pulse signal b3 of 30 Hz, and the control signal c1 corresponding to the first video signal is generated. Frequency divider 2 (1
5304) is obtained by dividing the oscillation circuit output a1 by 1/3.
0Hz pulse signal b4, 50H divided by 1/4
z pulse signal b5 and further divided by 2
The pulse signal b6 of 5 Hz is output. Switching circuit 2 (15
305) is a pulse signal b4 of 200 Hz, a pulse signal b5 of 50 Hz, and a second frame pulse b6 of 25 Hz.
And the control signal c2 corresponding to the second video signal is output. The oscillation frequency of the oscillation circuit 2 (15306) is 6 times 59.95 Hz, and its output signal a2
Is input to the frequency dividing circuit 3 (15307). Frequency divider 3
(15307) is a pulse signal b7 of about 180 Hz obtained by dividing the oscillation circuit output a2 by 1/2, and further divided by 1/3 by 5
A pulse signal b8 of 9.95 Hz and a pulse signal b9 that is further divided by 1/2 are output. The pulse signal b7 of about 180 Hz and the pulse signal of 59.94 Hz are for the switching circuit 3
By (15308), switching is performed by the third frame pulse signal b9 of 59.94 / 2 Hz, and the control signal c3 corresponding to the third video signal is generated. The selection circuit (15309) has three types of control signals c1, c2 and c3 corresponding to three types of video signals respectively.
One of the two is selected by the recording mode selection signal k and supplied to the recording head (111) via the recording circuit (15310) to record on the longitudinal track on the magnetic tape. FIG. 36 shows a signal waveform of the recording system of the first embodiment according to the present invention. The signal e read from the magnetic tape by the reproducing head (11) is waveform-shaped by the reproducing circuit (15314) and converted into a pulse signal f. The frequency discriminating circuit (15313) discriminates and outputs a plurality of frequency component pulses g1 and g2 included in the reproduced control signal, and also generates and outputs a frame pulse g3. Frequency discriminated signal g at standard tape speed
The frequencies 1 and gt2 are 12 for the first video signal.
0 Hz and 60 Hz, 200 for the second video signal
About 1 for Hz and 50 Hz and the third video signal
They are 80 Hz (3 times 59.94 Hz) and 59.94 Hz. The comparison circuit (15312) calculates the frequency ratio between the signals g1 and g2. That is, 120/60 = for the first video signal in the standard speed playback mode.
2, 200/50 = 4 for the second video signal, and 59.94 × 3/5 for the third video signal.
9.94 = 3. The ratio of these frequencies remains constant even when used in trick play mode. For example, when the double speed reproduction mode is taken as an example, the tape speed is doubled, so that the frequency of the signal contained in the control signal recorded on the longitudinal track is doubled uniformly. The frequencies of the frequency discriminated signals g1 and g2 for the first video signal are 240 Hz and 120 Hz, respectively. Therefore, the comparison circuit (15
312) The output h is 240/120 = 2, which matches the value at the standard tape speed. Similarly, for the second and third video signals, the output h of the comparison circuit (15312) is the same even if the tape speed during reproduction is changed. The output of the comparison circuit (15312) is input to the identification circuit (15311), and the standard of the recorded video signal can be determined depending on whether the input signal is 2 or 3 or 4. Identification circuit (1531
The determination signal i of 1) is the recording mode signal of the system,
It is transferred to a system control circuit (not shown), and the mechanism / control system and the signal processing circuit are set to an operation mode suitable for a predetermined video signal.

FIG. 37 shows a second embodiment of the TC / CTL / CUE recording / reproducing circuit of the present invention. In this embodiment, with respect to two types of video signals, the identification pulse having the frequency of the greatest common divisor of each frame frequency is superimposed on the frame pulse and recorded on the control track. The recorded video signal is discriminated. Further, FIG. 38 shows the main waveforms of FIG. 37. This will be described below with reference to FIGS. 37 and 38. The output signal j of the oscillator circuit (15318) is the frequency divider circuit (15319).
The signals k1 and k of 5 Hz for generating the mode identification signal of the frame frequency of the first video signal of 30 Hz, the frame frequency of the second video signal of 25 Hz and the greatest common divisor thereof.
It is divided into 2 and k3. Two frame signals k1 and k2
The frame signal of the recording video signal is selected by the selection circuit (15321) by the mode selection signal k. On the other hand, the signal k3 is supplied to the pulse generation circuit (15320) in FIG. 38 (k4).
Is converted into a mode identification pulse signal shown in. The selected frame signal 1 and the mode identification pulse k4 are added by the addition circuit (1
The control signal m added in 5322) is generated. The control signal m is recorded on the longitudinal control track on the magnetic tape via the recording circuit (5233) and the magnetic head 11. FIG. 38 (e) shows control signals corresponding to two video signals. From the relative phase relationship between the frame frequency and the mode identification pulse, the video mode can be identified even if the tape speed changes. The reproduction signal read from the magnetic head 11 is reproduced by the reproduction circuit (1532).
In 6), waveform shaping and identification are performed and converted into a control pulse signal o. The control pulse signal o is input to the counting circuit (15327) and the pulse detection circuit (5327) to count the rising edges of the control pulse signal o, the mode identification pulse of FIG. 38 (k4) is extracted, and the counting circuit (15327). To reset. The count value q at the standard playback speed is 5 and 6 for two video signals, respectively.
Then, the identification circuit (15323) identifies the video signal. The count value of the counting circuit becomes 5 and 6 respectively during special reproduction different from the standard speed, and the video signal can be identified.

FIG. 39 shows a third embodiment of the TC / CTL / CUE recording / reproducing circuit 153 of the present invention. In this embodiment, a different number of pulse trains are superimposed on frame signals of different frequencies, and the mode of the video signal is identified by the number of pulses. Further, FIG. 40 shows the main pulse train of FIG. 39.
This will be described below with reference to FIGS. 39 and 40. Oscillation circuit (15
The output signal j of 330) is input to the frequency dividing circuit (15331), and the first video frame signals k1 and 25 of 30 Hz are input.
A second video frame signal k2 of Hz and a multiplexed pulse signal k5 of 60 Hz are generated. The two frame signals k1 and k2 are selected by the mode selection signal k (15
In 332), the frame signal 1 of the recording video signal is selected.

The frame signal 1 is the gate generation circuit (153
33), the gate pulse shown in FIG. 40 (s) corresponding to the first and second frame signals selected by the mode selection signal k is generated with reference to the falling edge of the frame signal. The pulse width of the gate pulse s is the first and the second.
2 of multiplexed pulse k5 for each frame signal
Corresponds to pulses and 4 pulses. This gate pulse S
Thus, the multiplexed pulse k5 is intermittently selected by the gate circuit (15334), and the mode identification pulse train t is generated. Further, the frame signal 1 and the mode identification pulse train t are multiplexed by the adder circuit (15335) to generate the t control signal u. Recording is performed on the tape longitudinal control track via the recording circuit (15336) and the magnetic head 11. As is clear from the control signal waveform of FIG. 40 (u), if the number of mode identification pulse trains multiplexed in the frame signal is counted regardless of the tape speed, the reproduced video signal can be specified by that number. The reproduction signal v read from the magnetic head 11 is subjected to waveform shaping and identification by the reproduction circuit (15337) to reproduce the control pulse w.
Similar to the recording system, the gate pulse x for extracting the multiplexed pulse from the control pulse w is generated by the gate generation circuit (1
5338), and the gate circuit (15339) extracts the multiplexed pulse y from the control pulse w. The counting circuit counts the number of multiplexed pulses, and if the count value z is 2 in the discrimination circuit (15341), the first video signal, 4
If so, it is judged as the second video signal and the identification signal α is transferred to a system control circuit (not shown).

As described above, according to the present invention, since the recording mode identification signal is recorded on the longitudinal track in the tape running direction as the recording mode identification method of the different video signal system,
It does not cause an unstable operation due to erroneous determination due to a missing signal in the special reproduction operation mode such as slow and high speed reproduction which occurs when recording on a helical track.
Further, since a control signal in which a discrimination signal having a relatively simple frequency or phase relationship with the frame signal is recorded is recorded, not only can it be realized with a simple circuit configuration, but also the discrimination of the discrimination signal can be easily performed. Even if the recording / playback condition deteriorates due to pain or wear, the recording mode can be determined in a stable manner, which prevents a fatal accident such as damage to the VTR body or software destruction due to a malfunction of the recording mode determination, and always stable audio and video. Recording and reproduction of signals can be realized. Further, since it is continuous with the conventional VTR by the method of recording on the control track based on the frame signal, it is excellent in compatibility with the conventional VTR peripheral equipment such as an editing machine and a camera.

Next, a method of identifying by devising the information signal in the video signal track or the AUDIO signal track will be described. That is, in this embodiment, signals based on different standards are recorded on the medium at the same recording rate, and the signals are segment signals each including a synchronization block to which a synchronization signal for timing synchronization during reproduction is added. Having a plurality of the above synchronization signals in a certain period immediately before the synchronization block at the beginning of the segment signal,
The number of sync signals existing in a fixed period immediately before the leading sync block is changed in accordance with different standards.

At this time, as another aspect, the phase of the synchronizing signal existing in the certain period immediately before the leading synchronizing block of each segment signal within the certain period can be changed corresponding to different standards.

There is also a method in which there is a pattern in which a constant frequency is obtained during reproduction in a constant period immediately before the leading sync block of each segment signal, and the frequency of the pattern is changed according to different standard. As another embodiment, a signal based on different standards is recorded on a medium at a recording rate unique to each standard, and a segment signal composed of a plurality of synchronization blocks to which synchronization signals are added for timing synchronization during signal reproduction. age,
Each segment signal has a pattern such that it has a constant frequency at the time of reproduction for a certain period immediately before the synchronization block at the beginning,
An example of identifying different standards depending on the frequency components obtained by reproducing the pattern part will also be described.

At this time, the pattern having a constant frequency at the time of reproduction provided for a constant period immediately before the leading sync block of each segment signal is a bit synchronization pattern or a part thereof.

Further, in a recording / reproducing apparatus compatible with multi-standards, a signal is made into a segment signal composed of a plurality of synchronization blocks to which synchronization signals for timing synchronization at the time of reproduction are respectively added, and the above-mentioned synchronization signal for each standard. There is also a way to make the patterns different.

As another aspect, it is also possible to identify each standard by changing the channel coding method.

When the above identification method is used, a plurality of changes or setting elements of the recording / reproducing apparatus, which are necessary when the recording / reproducing apparatus is made to correspond to each standard, are changed or set to the correct state with respect to the standard. Only when it is determined, it is determined that the recording / reproducing apparatus is ready for the standard.

This is the state of the switch in which the plurality of changing or setting elements change at least the signal processing circuit,
The type of reference signal required for recording and reproducing the signal and the recorded standard given by the recording medium itself or the physical deformation added to the case of the recording medium or the information storage medium added to the case of the recording medium are described. It is characterized by including the information to be shown.

Since a plurality of HDTV standards differ in the number of active lines, frame frequencies, sampling rates, etc., recording / reproduction is performed by devising the signal processing part so that the recording / reproduction system is not complicated, with the same format and recording rate. Countermeasures are possible. In such a case, when reproducing a signal, data can be identified by any standard. The following embodiment relates to a method for reproducing the signals of different standards recorded with the same format and recording rate and identifying the standards.

FIG. 41 shows an example of the structure of the segment signal in the embodiment. As shown in the figure, this segment signal is the first block 4109 of the digital information signal.
In front of the first block 4109, a portion in which M = 5 synchronization signals 4102 to 4106 are continuously arranged in a concentrated manner is provided so as to be continuous with the synchronization signal 4108 (consisting of n bits) added to the head of the first block 4109. There is. The synchronization signal 41
The numbers 02 to 4106 may not be continuous and may be arranged with a certain interval. A pull-in signal 4101 for bit clock reproduction is arranged in front of the concentrated arrangement portion of the synchronizing signals 4102 to 4106. The signal 41 placed in the portion between the sync signal group and the first block 4109
Although any signal other than the synchronization signal may be used as 07, it may be the same signal as the pull-in signal 4101 for reproducing the bit clock in consideration of the synchronization of the bit clock.

FIG. 42 is a block diagram showing the configuration of the standard identification circuit in this embodiment. Each element operates, for example, on the basis of a bit clock reproduced from a reproduction signal by a PLL circuit or the like, but the bit clock reproduction system and the supply system are omitted in the figure.

In FIG. 42, the input terminal 4201 has
The segment signal shown in FIG. 41 is input. This segment signal is serially taken into the n-bit shift register 4203. The output of the n-bit shift register 4202 is compared with the bit corresponding to the n-bit sync signal pattern stored in advance in the sync signal detector 4203, and when all n bits match, a sync signal detection pulse is output. The synchronization signal detection pulse is supplied to the gate generator 4204 and the counter 4205.

When the synchronization signal detection pulse is input, the gate generator 4204 creates a gate pulse having a constant width and supplies it to the counter 4205. The counting unit 4205 counts the synchronization signal detection pulses input while the gate pulse is being supplied, and outputs the count value. The identification unit 4206 outputs an identification pulse when the count value satisfies a certain condition with respect to the set value N. The set value N is a different value corresponding to each standard. For example, when there are three different standards, three values are N1 for standard 1, N2 for standard 2 and N3 for standard 3. Value is prepared. The number M of sync signals in the sync signal group of the concentrated arrangement shown in FIG. 41 is N ≦ M with respect to this set value N.
It is recorded with different values for each standard. For example, if there are three different standards, three values of M1 for standard 1, M2 for standard 2 and M3 for standard 3 are prepared. For example, the relationship of each value is 2 ≦ N1 ≦ M1 <N2 ≦
If M2 <N3 ≦ M3 is set, the count value C of the counter is N
If 1 ≦ C ≦ M1, an identification pulse indicating standard 1 is output, if the count value C is N2 ≦ C ≦ M2, an identification pulse indicating standard 2 is output, and the count value C is N3 ≦ C.
If ≦ M3, three different types of standards can be identified by outputting an identification pulse indicating standard 3. The reason why the set value N of the count value is smaller than the number M of the centrally arranged synchronizing signals is that not all the centrally arranged synchronizing signals are necessarily detected even if an error or the like does not occur. Optimum values may be selected for the number M of centrally arranged synchronization signals and the set value N of the count value according to the system.

FIG. 43 shows an embodiment of another segment signal. 43 (a) shows a segment pulse indicating the beginning of a segment, and FIG. 43 (b) shows the beginning of a segment signal, which is added to the beginning of the first block 4306 before the first block 4306 of the digital information signal. The two regions 4302 and 4303 for arranging the synchronizing signal group are provided so as not to be continuous with the generated synchronizing signal 4305 (consisting of n bits). Note that the regions 4302 and 4303 may be arranged with a certain interval instead of being continuous. This area 4302, 4303
Signal for pull-in for bit clock recovery before
301 is arranged. Area 4 where the sync signal group is placed
The signal 4304 arranged between the 303 and the first block 9 may be any signal other than the synchronization signal, but in consideration of the bit clock synchronization, a signal 4301 for pulling in the bit clock is used. It should be the same signal. FIGS. 43 (c) and 43 (d) are gate pulses for detecting the two regions 4302 and 4303 in which the sync signal groups are arranged, respectively, and are formed on the basis of the segment pulse of (a).

The standard is identified by which of the areas 4302 and 4303 the synchronization signal group is arranged. Since two regions are provided in this embodiment, a maximum of four types can be distinguished. The types that can be distinguished can be increased or decreased depending on the number of areas provided.

FIG. 44 is a block diagram showing the structure of the second standard identification circuit in this embodiment. Each element operates on the basis of a bit clock reproduced by, for example, a reproduction signal PLL circuit, but the bit clock reproduction system and the supply system are omitted in the figure.

In FIG. 44, the input terminal 4501 is
The segment signal shown in FIG. 43 is input. This segment signal is serially taken into the n-bit shift register 4402. The output of the n-bit shift register 4402 compares the bits corresponding to the n-bit sync signal pattern stored in advance in the sync signal detection unit 4403, and when all n bits match, a sync signal detection pulse is output. The sync signal detection pulse is supplied to the counting gate generation unit 4404 and the counting unit 4405. When the synchronization signal detection pulse is input, the counting gate generation unit 4404 creates a gate pulse having a constant width and supplies the gate pulse to the counting unit 4405. The counting unit 4405 counts the sync signal detection pulses input while the gate pulse is being supplied, and outputs the sync signal group detection pulses when the count value satisfies a certain condition with respect to N as a set value. If the number of synchronization signals included in the synchronization signal group is M, then N <M and, for example, the count value is N.
When ≦ C ≦ M, an identification pulse is output. Here, the counting unit N44
The reason why the set value N of the count value of 05 is set to be smaller than the number M of sync signals included in the sync signal is that not all sync signals included in the sync signal group are necessarily detected due to an error or the like. For the number M of sync signals included in the sync signal group and the set value N of the count value, optimum values may be selected according to the system. The detection pulse of the synchronization signal group is detected by the detection unit 1 (450
6) and the detection unit 2 (4407). Further, with reference to the segment pulse input from the input terminal 4408, the regions 4302, 43 in which the presence of the synchronization signal group should be detected
A detection gate indicating 03 is created by the detection gate generation unit 4409, and detection unit 1 (4406) and detection unit 2 (44
07). The detection unit 1 (4406) and the detection unit (4407) determine whether or not a sync signal group exists in each area. For example, “1” if the sync signal group exists, and “0” if the sync signal group does not exist. Output terminal 441
0, 4411. By decoding this 2-bit output, the corresponding standard can be identified.

In the above two embodiments, the case where the sync signal is used as the identification signal is shown. However, even if the identification signal having a pattern different from that of the sync signal is used, there is no problem, and the identification is performed instead of the synchronization signal detector in terms of the configuration. A detection unit capable of detecting the signal pattern may be provided.

FIG. 45 shows an embodiment of another segment signal. FIG. 45 (a) shows the head portion of the segment signal. Before the first block 4505 of the digital information signal, an area 4502 for recording a pattern having a constant frequency during reproduction is provided. This area 4
In front of 502, a pull-in signal 4501 for bit clock recovery is arranged. The signal 4503 arranged between the area 4502 for recording a pattern having a constant frequency during reproduction and the first block 4505 may be omitted, and the pull-in for reproduction of the bit clock is taken into consideration in consideration of bit clock synchronization. It may be the same signal as the signal 4501. FIG. 45B shows a segment pulse indicating the beginning of the segment. FIG. 45C shows an area 4502 in which a pattern having a constant frequency during reproduction is recorded.
Is a gate pulse for detecting the pulse width, and is generated based on the segment pulse of (a). The standard is identified by changing the frequency of the recording pattern according to the standard in the area 602 for recording the pattern having a constant frequency during reproduction. For example, "10" for standard 1.
Repeat pattern of "11" for Standard 2
If the repeating pattern of "00" and the repeating pattern of "11110000" for the standard 3 are f, the reproduction frequency of the repeating pattern of "10" of the standard 1 is f / 2 for the standard 2 and the standard 3 Then, the standard becomes f / 4, and the standard can be identified depending on which frequency is reproduced.

FIG. 46 is a block diagram showing the configuration of the third standard identification circuit in this embodiment. A reproduction signal of the segment having the configuration shown in FIG. 45A is input to the input terminal 4601. This reproduction signal is applied to the gate circuit 4
Only the identification pattern portion is taken out by the gate shown in FIG. 45C, which is generated by the gate generation unit 4604 with reference to the segment pulse supplied to the input terminal 602 and supplied to the input terminal 4603, and the extracted identification pattern portion. Is supplied to the identification unit 4605. Identification 4605
Is composed of a frequency detection unit, and here, in order to identify the above-mentioned three types of standards, a detection unit (1) 4606 for detecting the frequency f and a detection unit (2) 4607 for detecting the frequency f / 2 are provided. The detection unit (3) 4608 for detecting the frequency f / 4 is provided. The standard can be identified by which detection unit outputs the detection pulse. It is conceivable that the detection unit is composed of, for example, a bandpass filter and a level detection circuit.

A plurality of patterns having different frequencies are prepared at the time of reproduction, and in FIG. 45 (a), the combination of patterns to be recorded in the pattern recording area 4502 is made to correspond to each standard, and detected at the time of reproduction. It is also possible to identify the standard by a combination of frequencies. FIG. 47 is a block diagram showing the configuration of the identification circuit in this case. The basic configuration is exactly the same as in FIG. Here, two types of patterns, for example, the repeating pattern of “10” and the repeating pattern of “1100” described above are prepared, and when the frequency at the time of reproducing the repeating pattern of “10” is f, the identification unit Reference numeral 4605 includes a detection unit (1) 4706 for detecting the frequency f and a detection unit (2) 4707 for detecting the frequency f / 2. For example, only the repeating pattern of "10" for standard 1 and "1" for standard 2
If only the repeating pattern of “100” and the repeating pattern of “10” and the repeating pattern of “1100” for the standard 3 are recorded in the pattern recording area 4502 in FIG. A detection pulse can be obtained only from the detection unit (1) 4706 that detects the frequency, or the detection unit (2) 470 that detects the frequency f / 2.
Whether the detection pulse can be obtained from only 7 or the detection unit (1) 47
It is possible to distinguish three types of standards depending on whether detection pulses are obtained from both 06 and detection (2) 4707. That is, the standard can be identified by decoding the combination of the presence or absence of the detection pulse of the frequency detection unit.

When the recording rate is different depending on the standard, the frequency at the time of reproduction is different even for the same pattern, so it is not necessary to prepare different patterns for each standard, and the same pattern, for example, "10" is used. If the repeating pattern is provided with a detection unit capable of detecting the frequency for each standard shown at the time of reproduction depending on the recording rate, the standard can be identified. Since the pattern for bit synchronization usually has a single frequency at the time of reproduction, the pattern portion for bit synchronization or a part thereof can be used together as a standard identification pattern.

According to the present invention, when the tape is reproduced, the recorded standard is automatically identified.
Changes to TR standards can be automated. Since the identification is always performed at the beginning of the segment, even if the tape is reproduced from the middle, it can be automatically identified even if the standard is changed and recorded in the middle of the tape. Further, since the synchronizing signal or the pattern having a single frequency is used as the identification signal, the signal configuration and the identification circuit configuration are not complicated.

FIG. 48 shows an embodiment in which the sync signal for block synchronization is made different depending on the standard so that the reproduced image and reproduced sound are not output when the tape recorded with the standard different from the setting of the DVTR is reproduced. It is a block diagram for explaining. Here, there are three types of standards. Note that only the configuration different from that in FIG. 1 will be described here. When recording on a tape, the synchronization signal information 4801, 4802, and 4803, which have been determined for the standard, are selected by the changeover switch 4.
In the case of selecting and reproducing according to 804, the synchronization signal pattern 4805 according to the originally recorded standard,
4806 and 4807 are selected by the changeover switch 4808 so that the sync signal can be detected. However, DVT
When a tape recorded with a standard different from the setting of R is reproduced, the synchronization signal pattern selected by the changeover switch 4808 is also different from the recorded synchronization signal pattern, so the synchronization detection unit 134 outputs the synchronization signal. Cannot be detected. Therefore, the block synchronization cannot be obtained, so that the demodulation unit 135 and the decoding unit 136 cannot process the data, the signal is not sent to the video and audio output unit, and the reproduced image and the reproduced sound are not output.

It is possible to inform that the setting of the standard is wrong by judging that the sync signal is not detected even though the reproduction signal is inputted to the sync signal detecting portion and the block synchronization is not established. .

FIG. 49 shows that when the channel coding is made different according to the standard and the tape recorded with the standard different from the setting of the DVTR is reproduced,
FIG. 9 is a block diagram for explaining an embodiment in which a reproduced image and reproduced sound are not output. Here, there are three types of standards. Here, similarly to FIG. 48, only the configuration different from FIG. 1 will be described. When recording on tape, modulation circuits 4901, 4902, and 4 of channel coding, which are determined for the standard
903 is selected by the changeover switch 4904. When reproducing, the channel coding demodulation circuits 4905, 4906, 4 are used according to the originally recorded standard.
907 is selected by the changeover switch 4908 to enable correct demodulation. However, when a tape recorded with a standard different from the setting of the DVTR is reproduced, the demodulation circuit selected by the changeover switch 4908 is different from the recorded channel coding demodulation circuit, so that correct demodulation is not performed, Since the data supplied to the decoder or 136 cannot be decoded and no signal is sent to the video and audio output section, no reproduced image or reproduced audio is output.

Despite the reproduction signal being input to the demodulation section, it is possible to judge from the data supplied to the decoder 136 that decoding is not possible and inform that the standard setting is incorrect. .

According to the above-described embodiment, when a tape recorded with a standard different from the setting of the DVTR is reproduced, it is possible to prevent a disordered image from being output to the monitor or an unpleasant sound from being output. In particular, when a program is sent out, a disturbed image or unpleasant sound is not sent out as it is. In addition, it is possible to inform that the standards are different by judging the non-detection of the sync signal or the state of decoding addition.

FIG. 50 is a block diagram showing an example of a configuration for managing and determining the states of changes or setting elements required when the DVTR is made compatible with each standard. Note that FIG. 50 can also be applied to the controller 132 of FIG.

Here, as a change or setting element, A /
D clock frequency, type of frame pulse, additional identification information, encoding circuit switching, decoding circuit switching, servo circuit switching, recording / reproducing circuit switching, recording standard information (cassette), and display.

In FIG. 50, reference numerals 5001 to 5009 are parts for detecting the states of the above-mentioned changed or set elements and outputting information on the states. The information management determination unit 5010 takes in the information output from the status information output units 5001 to 5009, selects the necessary status information from the mode information from the recording / playback mode output unit 5011, and the entire DVTR can support the desired standard. Output the determination information. The determination method determines that the entire DVTR can support the desired standard when all status information is correct for the desired standard.

The judgment information can be used for warning, change or status check or resetting of setting elements.

The above embodiment manages the states of all changed or set elements and determines that the entire DVTR can support the desired standard when all state information is correct for the desired standard. You can prevent tapes that are recorded in a method that does not apply to the standard. Further, since the processing is correctly performed even during reproduction, it is possible to prevent the reproduced image from being disturbed or an unpleasant sound to be generated.

[0150]

As described in detail, according to the cassette type digital magnetic recording / reproducing apparatus of the present invention, the HDT of different systems is used.
By sharing the VTR mechanism, circuit, cassette tape, etc. for recording and reproducing the V system image signal, it is possible to easily exchange programs between Japan, the US and Europe, and reduce the equipment cost and running cost. You can

[Brief description of drawings]

FIG. 1 is a block diagram according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a track arrangement on the tape of the present invention.

FIG. 3 is a diagram showing one frame of a Japanese HDTV signal to be recorded.

FIG. 4 is a data arrangement diagram on a track in the method of FIG.

FIG. 5 is a diagram showing a one-frame video signal of the European system.

FIG. 6 is a data layout diagram on a track in the method of FIG.

FIG. 7 is a diagram showing an American 1-frame video signal.

8 is a data layout diagram on a track in the system of FIG. 7. FIG.

FIG. 9 is a diagram showing a track pattern of one field according to a second embodiment of the present invention.

FIG. 10 is an enlarged view showing an audio recording area of the channel of FIG. 9.

FIG. 11 is a first diagram showing various audio recording systems.

FIG. 12 is a second diagram showing various audio recording systems.

FIG. 13 is a third diagram showing various audio recording systems.

FIG. 14 is a fourth diagram showing various audio recording systems.

FIG. 15 is a diagram showing recording data per field according to one embodiment of the present invention.

FIG. 16 is a diagram showing an error correction matrix of the embodiment.

FIG. 17 is a diagram showing a data array of one field of the embodiment.

FIG. 18 is a diagram showing address allocation on the field memory of the embodiment.

FIG. 19 is a configuration diagram of an error correction circuit according to the same embodiment.

FIG. 20 is a diagram showing control of a normal reproducing field memory of the embodiment.

FIG. 21 is a diagram showing control of a reproduction field memory when reproducing a different method of the embodiment.

FIG. 22 is a diagram showing control of a reproduction field memory when reproducing a different system of the embodiment.

FIG. 23 is a diagram showing control of a reproduction field memory in the case of reproducing a different method of the embodiment.

FIG. 24 is a block diagram of scan line identification according to a fourth embodiment of the present invention.

FIG. 25 is a block diagram of scanning line identification by the barcode label of the same embodiment.

FIG. 26 is a scanning line identification block diagram of the magnetic card of the embodiment.

FIG. 27 is a block diagram of scanning line identification by the optical card of the example.

FIG. 28 is a block diagram of scanning line identification by the memory card of the embodiment.

FIG. 29 is a block diagram of scanning line identification by the selection switch of the embodiment.

FIG. 30 is a view showing the structure of the selection switch of the embodiment.

FIG. 31 is a block diagram of the liquid crystal display device of the embodiment.

FIG. 32 is a block diagram of voice display of the embodiment.

FIG. 33 is a scanning line identification block diagram by cue tracks according to the fifth embodiment of the present invention.

FIG. 34 is a diagram showing an example of signals of the oscillation circuit shown in FIG. 33.

FIG. 35 is a first TC / CTL according to an embodiment of the present invention.
6 is a block diagram of a / CUE recording / reproducing circuit.

36 is a signal waveform of the recording system in FIG. 35.

FIG. 37 is a second TC / CTL according to an embodiment of the present invention.
6 is a block diagram of a / CUE recording / reproducing circuit.

FIG. 38 shows the main waveform of FIG. 37.

FIG. 39 shows a third TC / CTL according to an embodiment of the present invention.
6 is a block diagram of a / CUE recording / reproducing circuit.

FIG. 40 is the main pulse train of FIG. 39.

FIG. 41 is a configuration example of a first segment signal according to an embodiment of the present invention.

FIG. 42 is a block diagram of a first standard identification circuit according to an embodiment of the present invention.

FIG. 43 is a configuration example of a second segment signal according to an embodiment of the present invention.

FIG. 44 is a block diagram of a second standard identification circuit according to an embodiment of the present invention.

FIG. 45 is a configuration example of a third segment signal according to an embodiment of the present invention.

FIG. 46 is a block diagram of a third standard identification circuit according to an embodiment of the present invention.

FIG. 47 is a block diagram of a modified example of FIG. 46.

FIG. 48 is a first block diagram showing a configuration in which reproduced images and reproduced sound are not output when tapes of different standards are applied according to an embodiment of the present invention.

FIG. 49 is a second block diagram showing a configuration in which reproduced images and reproduced sound are not output when tapes of different standards are applied according to an embodiment of the present invention.

FIG. 50 is a block diagram for managing and determining a state for supporting each standard according to an embodiment of the present invention.

[Explanation of symbols]

 65, 85 ... Open space 1904 ... ID detection circuit 1907 ... Control circuit 1908 ... Mode setting circuit 2501 ... Bar code label 2600 ... Magnetic card 153 ... TC / CTL / CUE recording / reproducing circuit

Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI Technical indication location H04N 5/92 H 4227-5C (72) Inventor Yasuyuki Nishikawa 1 Komukai Toshiba-cho, Kawasaki-shi, Kanagawa Prefecture Incorporated company Toshiba Research Institute (72) Inventor Toshinobu Murakami 1 Komukai Toshiba-cho, Sachi-ku, Kawasaki-shi, Kanagawa Incorporated Toshiba Research Institute (72) Inventor Keisuke Ogi Komukai-Toshiba, Kawasaki-shi, Kanagawa No. 1 inside Toshiba Research Institute, Inc. (72) Inventor Fumihiko Murakami No. 1 Komukai Toshiba-cho, Sachi-ku, Kawasaki-shi, Kanagawa Inside Toshiba Research Institute, Inc.

Claims (3)

[Claims] 1. A high-definition information consisting of video and audio is recorded and reproduced in an area of N × L (L> 0) in units of N (N> 0) bits on a magnetic recording medium. 1 recording / reproducing method and M (M> N) bits as a unit M ×
A digital magnetic recording / reproducing apparatus for recording / reproducing the high-definition information by a second recording / reproducing method for recording / reproducing in an area of K (K> 0), comprising: A recording unit for recording information different from the high-definition information and a reproduction unit for reproducing information different from the high-definition information recorded by the recording unit, in the area for recording the information amount; The means records information different from the high-definition information in at least one area between the N-bit unit and the M-bit unit. 2. A cassette is inserted into a housing, and on the magnetic recording medium in the cassette, identification information for identifying a plurality of types of recording / reproducing methods for the recording medium attached to the housing of the cassette is provided. Therefore, in a cassette digital magnetic recording / reproducing apparatus for recording and reproducing high-definition information composed of video and audio, an identification information reading means for slidingly reading the identification information attached to the casing of the cassette, and the identification information reading means. Recording / reproducing method selecting means for selecting one kind of recording / reproducing method from the recording / reproducing method according to the identification information by the means, and the reading operation of the identifying information reading means is performed in the housing of the cassette. A cassette digital magnetic recording / reproducing apparatus characterized by being performed at the time of insertion. 3. A high-definition information consisting of video and audio having an information amount of A (A> 0) bits recorded on a magnetic recording medium,
A digital magnetic recording / reproducing apparatus for recording / reproducing the high-definition information by a first recording / reproducing method for reproducing and a second recording / reproducing method for recording / reproducing B (B> A) bits, The recording / reproducing method of the first recording / reproducing method or the second recording / reproducing method is selected, and the identification information recording means for recording the reproducing method identification information, and the identification information by the identification information recording means. An identification information reproducing means for reproducing, and a recording and reproducing means for recording and reproducing by the first recording and reproducing method or the second recording and reproducing method according to the identification information by the identification information reproducing means, An identification information recording means records the recording / reproducing method identification information on the magnetic recording medium.