JPS643430B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an information signal recording disk, in which a video signal of the same frame of a movie film of 24 frames per second is repeatedly recorded during a plurality of field periods per revolution, and an audio signal is The tracks are sequentially arranged and recorded according to the track scanning locus during playback, and in principle, a track change address signal (hereinafter referred to as "kick") is placed at one location for each rotation to instruct whether or not to forcibly change the track of the pick-up playback element and in its direction. information that enables selective reproduction of a complete still image and normally reproduced images and normally reproduced audio by track reproduction based on the 2-3 (or 3-2) pull-down method. The purpose is to provide a signal recording disk.

Conventionally, when obtaining a still image from an information signal recording disk (hereinafter referred to as a "disk") in which a video signal and an audio signal are recorded on the same spiral track, one track formed for one rotation of the disk is used. It is known that this can be done by repeatedly reproducing. However, on a disk where video and audio signals are recorded in a plurality of fields, for example at a rate of 4 fields, on a track formed per revolution of the disk, the video signals of 4 fields are repeatedly played back by the above still image playback. Therefore, if this video signal is a moving image, the reproduced image will not be a completely still image and will have jitters, and the faster the video signal is for an image, the more the still image will not look static and the reproduced image will be unsightly. Ta.

On the other hand, when playing back a still image from a disc where the same video signal is recorded four times as a 4-field video signal recorded on a track formed per revolution of the disc, the same field (or the same frame) ) video signal is played repeatedly, so it is possible to obtain a completely still image, but on the other hand,
When conventional normal playback is performed without forcibly changing the track of the pick-up playback element, if the disc is recorded with 3/4 of the image information dropped, the movement of the playback image becomes awkward, and the image information is also dropped. In the case of a disc recorded without recording, the reproduced image looks like a slow motion image, and it is not possible to obtain a normal reproduced image or normal reproduced sound.

Therefore, the present applicant has proposed an information signal recording disk that can arbitrarily select and reproduce a complete still image, a normally reproduced image and normally reproduced sound based on a pull-down method, in Japanese Patent Publication No. 51313/1983.

In this information signal recording disk proposed by the present applicant, in order to obtain normally reproduced images and normally reproduced sounds, the pick-up reproduction element is forcibly changed at least once per rotation based on a pull-down method. Draw a scanning trajectory. However, this scanning trajectory is determined by the difference between the field frequency of the recorded video signal or the number of frames per second of movie film and the field frequency of the video signal to be reproduced (in other words, the specified field frequency of the video signal that can be displayed by the monitor receiver). Depends on the relationship.
Therefore, in the information signal recording disc proposed by the present applicant, it is necessary for the player to inform the player by some means in advance of what kind of scanning trajectory he or she wants the player to draw, which is troublesome, and it is difficult to specify the scanning trajectory. If you make a mistake, the discontinuous points in the audio signal will be reproduced, making it impossible to obtain a normally reproduced audio signal or a normally reproduced image.

Furthermore, depending on the software, tracks on which recording is performed, such as the information signal recording disk proposed by the present applicant, may not be formed over the entire recording area of one information signal recording disk. First, the video signal is recorded only in a part of the recording area, and the video signal is recorded in the remaining part of the recording area in order to obtain a normal playback image and a normal playback sound without any forced change in the track of the pick-up playback element, as in the past. and an information signal recording disk on which audio signals are recorded. Therefore, in this type of information signal recording disk,
During normal playback, the pick-up playback element must be selectively forced to change tracks in some areas and not in other areas.

The present invention has been made in view of the above points, and each embodiment thereof will be described below with reference to the drawings.

The present invention relates to a disk in which a video signal and an audio signal are recorded on the same track at a rate of multiple fields per revolution, and will be explained using, as an example, a case in which the present invention is applied to a disk previously proposed by the applicant. do. In this disk proposed by the present applicant, the main information signal is recorded on a spiral main track without forming a needle guide groove, and the main information signal is recorded at a frequency lower than the recording frequency band of the main information signal. First and second tracking control reference signals (hereinafter referred to as "tracking signals") _p1 and _p2 that have different frequencies and are burst-like;
are alternately switched every rotation period of the disk to form a sub-track approximately in the middle between the respective track center lines of adjacent main tracks, and furthermore, a sub-track is recorded at the switching connection part of _p1 and _p2 . is a disk having an electrode function in which the third tracking signal _p3 is recorded on the main or sub-track at a level below a predetermined level so as not to affect the main information signal.

Here, a description will be given of an example of a capacitance change detection/reading type disk in which video signals and audio signals as the main information signals are recorded as a series of pits that are intermittent at a rate of four fields per revolution. FIG. 1 is a diagram schematically showing the recording arrangement relationship of the recording tracking signals of the disk proposed by the applicant, and in the figure, the ○ mark indicates the tracking signal _p1.
Recording positions, the x marks indicate the recording positions of the tracking signal _p2 , the solid lines indicate the track center line of the main track, and a, b, c, and d indicate the vertical blanking period recording portions, which are further indicated by diagonal lines. A tracking signal _p3 is recorded in the vertical blanking period recording portion a.

FIG. 2 shows a block system diagram of an embodiment of the main part of the disk recording system according to the present invention. In the same figure, 1
and 2 are audio signal sources, and audio signals to be recorded on the disk are reproduced by, for example, a tape recorder. These audio signal sources 1 and 2 are arranged in advance in a predetermined order for each field so that the audio signals are arranged in a chronological order in a predetermined order for each field unit, and the audio signal portions are recorded in correspondence with the still image recording portions of the video signals, which will be described later. The synthesized audio signals are output to frequency modulators 3 and 4, respectively. The frequency modulator 3 outputs the input audio signal as a first audio frequency modulated wave of, for example, 3.43MHz±75kHz to the mixer 5, and the frequency modulator 4 outputs the input audio signal as a first audio frequency modulated wave of, for example, 3.73MHz±75kHz. Output to mixer 5.

On the other hand, 6 is a color video signal source from which a color video signal from a movie film of 24 frames per second is extracted and supplied to a luminance signal processing circuit 7, where the upper limit frequency of the luminance signal is limited. The carrier color signal is supplied to a carrier color signal processing circuit 8, where the carrier color signal is separated and converted to a lower frequency. The luminance signal taken out from the brightness signal processing circuit 7 and the low-pass converted carrier color signal taken out from the carrier color signal processing circuit 8 are each subjected to, for example, band sharing multiplexing in a mixer 9, and then supplied to the mixer 5. Ru.

Furthermore, 10 is an address signal generation circuit which generates a chapter address signal, a time address signal, and a kick address signal to be described later in a predetermined manner corresponding to the vertical blanking period of the luminance signal taken out from the luminance signal processing circuit 7. Output in order. A _K1 and A _K2 shown in FIG. 3D indicate address signals for kick.
The chapter address signal, time address signal or kick address signal is supplied to the mixer 5. Further, the tracking signal generator 11 is supplied with the luminance signal from the luminance signal processing circuit 7 and the low-pass converted carrier color signal from the carrier color signal processing circuit 8, and separates the subcarrier frequency of the low-pass converted carrier color signal. the first, second and third tracking signals _p1 , _p2 having different frequencies and different frequencies;
and _p3 are generated at predetermined timing. here,
As shown in FIG. 3B, the tracking signals _p1 and _p2 correspond to the horizontal blanking period of the band-sharing multiplexed signal (shown in FIG. 3A) of the luminance signal and the low-frequency conversion carrier chrominance signal output from the mixer 9, as shown in FIG. 3B. This is a burst-like signal that is output only during a period in which the color burst signal is avoided so as not to adversely affect the color burst signal, and the tracking signals _p1 and _p2 are output from the output terminal alternately every one rotation period of the disk. 12,1
The output is switched to 3.

The waveform of the modified color video signal to be recorded, which is the output of the mixer 9, is shown in FIG. Numbers C _b1 to C _b7 indicate color burst signals. Also, a third tracking signal
As shown in FIG. 3C, _p3 is generated for one rotation of the disk and is outputted to the output terminal 15 over a period of about 3H corresponding to the vertical synchronizing pulse period of the modified color video signal recorded in FIG.

The modified color video signal to be recorded by the mixer 5, first and second audio frequency modulated waves occupying vacant frequency bands higher than this, a chapter address signal, and a time address. The signal and the kick address signals A _K1 to A _K8 generated and outputted at the timing shown in FIG. The output terminal 15 outputs the third tracking signal _p3 and the first and second tracking signals _p1 and _p2 from the output terminals 12 and 13 to the recording optical system (not shown) as a main information signal. Note that the carrier wave shift frequency band of the luminance signal of the output frequency modulated wave of the frequency modulator 14 is determined by the sync chip when, for example, a color video signal from a movie film with 24 frames per second is reproduced as an NTSC color video signal. Level is 6.1MHz, pedestal level is 6.6M
Hz, white peak is 7.9MHz.

The above main information signal is applied to, for example, an optical modulator (not shown) to modulate a laser beam and convert it into a modulated light beam, which is applied onto a synchronously rotating disc-shaped recording master (not shown). The light is focused on the photosensitive material, and is subjected to a well-known development process to form a main track in the form of a series of pits that are intermittent in accordance with the repetition frequency of the main information signal. Therefore, the video signal and the audio signal are recorded simultaneously on the same main track. Note that the tracking signals _p1 and _p2 are applied to a different optical modulator (not shown), which similarly modulates the laser light and converts it into a modulated light beam, and then outputs the tracking signals p1 and p2 to the sub-modulator of the intermittent pit row. A track is formed simultaneously with the main track. A disk having a track pattern as shown in FIG. 1 is duplicated from the above-mentioned recording master through a well-known disk manufacturing process.

Next, one embodiment of the track pattern of the disk according to the present invention will be described in more detail.

FIG. 4 shows a schematic diagram of a track pattern of an embodiment of the disk according to the present invention. In the figure, a spiral broken line indicates the track center line of the main track for recording the main information signal, and illustration of the sub-track for recording the tracking signals _p1 and _p2 is omitted. Also a, b, c
and d indicate the recorded portion of the vertical blanking period recorded on the main track, as in FIG. The signal _p3 and any one of the kick address signals A _K1 to _{A K8} are time-division multiplexed and recorded. The present invention is characterized in that the kick address signals A _K1 to A _K8 are recorded respectively, and the details thereof will be described later.

Further, in FIG. 4, the alphabet represents one frame of the movie film of 24 frames per second which is the color video signal source 6, and the order of the alphabet represents the order of the frames. Therefore, as shown in FIG. 4, the color video signal of the same frame is formed on a main track (hereinafter also referred to as "one track") that is formed for one rotation of the disk starting from the vertical blanking period recording section a. (note that one frame of color video signal is recorded during a 1/4 rotation period of the disk). Furthermore, color video signals of each frame of a movie film at 24 frames per second are recorded sequentially on each track from the outer circumferential side to the inner circumferential side of the disk without losing any image information.

Furthermore, in FIG. 4, the number written next to the alpha alphabet indicates the division order of the divided audio signal portions obtained by dividing the audio signal to be recorded for each field period, and the illustrated position of the number indicates the division order. The divided audio signal partial recording range of the division order is shown. In other words, the audio signal is, in principle, divided into units of one field period, and in Figure 4, the number "2" in the outermost "A2" indicates the length of one field period to be played next to "A1". The number "3" in "A3" indicates that an audio signal with a length of one field period to be reproduced next to "A2" has been recorded. However, "1"
Only is the divided audio signal portion of 0.5 field period. Therefore, when the tracks are played back in numerical order, a normally played audio signal is obtained.

In the embodiment shown in FIG. 4, recording of the audio signal is started from the vertical blanking period recording portion a, and is normally recorded (recorded in the same way as in the conventional method) over 5.5 field periods (1.375 rotation periods). From the position (indicated by 400 in Figure 4) where 5.5 field periods have elapsed from the position, this time from the divided audio signal portion "3" recorded during the rotation period of angle γ (here, γ = 90°, 1 field period). The audio signal is normally recorded over 9 field periods, and then the audio signal is normally recorded over 11 field periods from the divided audio signal portion "8" from that position (indicated by 401 in FIG. 4). The audio signal is normally recorded over 12 field periods from the divided audio signal portion "15" recorded one track before the position (indicated by 402 in FIG. 4).
Thereafter, the same recording as above is repeated.

Therefore, the discontinuous point of the audio signal is 40 in FIG.
As shown at 1,402,403, the position is rotated by an angle (α + β) and an angle (α + β + γ) from the position of the vertical blanking period recording portion a (that is, here α = 45°, β = γ = 90°, , the position after 1.5 field periods and the position after 2.5 field periods). In FIG. 4, angles δ and ε are 90° and 45°, respectively. Also, the above positions 401, 402, 40
3 is a position where the recorded audio signal content is not continuous;
In this specification, this is referred to as a "discontinuous point of the audio signal."

Furthermore, in FIG. 4, the white square marks in the vertical blanking period recording portions b, c, and d on the main track indicate that the chapter address signal A _C and the time address signal A _T are recorded, respectively. show. Fifth
Figure A schematically shows the structure of a total 29-bit chapter address signal _AC , which mainly indicates the order of recording programs on the same recording surface of a disk.
A 4-bit synchronization code 16 indicated by SYNC, a 2-bit line identification code 17, a 2-bit voice identification code 18, an 8-bit chapter number identification code 19, a 12-bit time identification code 20, and a 1-bit parity bit 21. Become. When the recorded video signal is in the NTSC format, this chapter address signal A _C is used for each horizontal scanning period of horizontal scanning line numbers 17 and 280 (that is, for each of the odd and even fields, the equalization pulse after the vertical synchronization pulse is used). After, 8
The horizontal synchronizing signal is transmitted in a superimposed manner during one horizontal scanning period (from the time when the horizontal synchronizing signal is received).

The synchronization code 16 is 2, which indicates the value "C" in hexadecimal notation.
The base number is "1100", the line identification code 17 is a code that identifies the transmission line of the address signal A _C for the chapter, and the audio identification code 18 is a code that identifies the type of recording audio signal (for example, stereo, monaural,
This is a code indicating whether the person is bilingual, etc.). Furthermore, the chapter number identification code 19 is a code indicating the order of recording programs, and can indicate chapter numbers up to 99, for example. Also time identification code 2
0 is a code that indicates the track position from the initial position of each head of the recording program of each chapter number indicated by the chapter number identification code 19 in seconds, and is called a local address, and can range from 0 seconds to a maximum of 4095 seconds.
It can be expressed up to (=2 ¹² -1) seconds.

On the other hand, FIG. 5B schematically shows the structure of a total 29-bit time address signal A _T that mainly indicates the track position by the time from the initial position of the first recorded program in the program recording section of the disk. 4-bit synchronization code 22, 2-bit line identification code 23, 2-bit audio identification code 2
It consists of a time identification code 25 of 4.16 bits, a track identification code 26 of 4 bits, and a parity bit 27 of 1 bit. This time address signal A _T is transmitted during one horizontal scanning period (horizontal scanning line numbers 18 and 2) following the transmission period of the chapter address signal A _C.
81). The line identification code 23 indicates this transmission period, and the synchronization code 22 and voice identification code 24 have the same contents as the synchronization code 16 and the voice identification code 18, respectively. Further, the time identification code 25 indicates the time during normal playback from the first recording position of all recorded programs, and is 0.
It can indicate minutes from 0 seconds to a maximum of 59 minutes and 59 seconds.
However, in this example, as described later, the known 2-3
Since playback is based on the pull-down method (or 3-2 pull-down method), the maximum length on one side is 37 minutes and 30 seconds, whereas 60 minutes can be recorded using conventional normal recording. The track identification code 26 is a code for identifying the number of the track played in one second. This is because the disk according to the present invention, which reproduces video signals with a field frequency of 60 Hz together with audio signals, is rotated 15 times per second. This is because it is necessary to identify whether a track is being played back. However, the disk of this embodiment records video signals from a movie film at 24 frames per second repeatedly four times per revolution, and reproduces this as a video signal with a field frequency of 60Hz.
Normal playback is based on the 2-3 pulldown method.
Since the track is changed more than once to the rotation,
The result will be as shown in FIG. 8A, B or C.

In FIG. 8A, the values of the synchronization code 22, line identification code 23, audio identification code 24, and track number identification code 26 of the time address signal A _T recorded on the 8 tracks are shown in hexadecimal notation. , the track number identification code 26 is "0" for the first track, "1" for the second track,
Below "1", "2", "2", "3", "4", "4"
takes the value of The track number identification codes 26 recorded from the 9th track to the 16th track take the hexadecimal values shown in FIG. The number identification code 26 takes the hexadecimal values shown in C in the figure in order from the top. The code 26 successively takes on the values shown in FIGS. 8A to 8C for every 24 tracks. During normal playback, the track is played back so that the value of the code 26 increases sequentially from ``0'' by ``1'' to ``E'' every rotation of the disk.

That is, on the disk of this embodiment, the time address signal A _T is recorded at a cycle of 24 tracks.
The content shown in Figure 8A is recorded on the first eight tracks, and the content shown in Figure 8A is recorded on the next eight tracks.
The contents shown in FIG. 8B are recorded, and the last eight tracks of one cycle are recorded with the contents shown in FIG. 8C. However, in FIG. 8A, the value of the time identification code shown at 25 in FIG. 5B is omitted because it differs depending on the track position, and in FIGS. Only the value of code 26 is shown.

The above-mentioned chapter address signal A _C and time address signal A _T are shown in white squares b, c, and d in Fig. 4 among the four vertical blanking periods recorded per disk revolution. As shown, the third tracking signal _p3 is recorded in each of the three unrecorded vertical blanking period recording portions.

Furthermore, in FIG. 4, the black circle in the vertical blanking period recording portion a is the blanking address signal.
Indicates that A _K is recorded at that position. This kick address signal A _K has a structure as shown in FIG.
There are eight types, A _K1 to A _K8 , as shown in Figures A to H, respectively.
These are the fourth address signals A _C and A _T instead of the address signals A C and AT.
As shown in the figure, the third tracking signal _p3 is transmitted at an 8-track period and is recorded twice in two horizontal scanning periods within the vertical blanking period (here, from a movie film with 24 frames per second). Since the color video signal is reproduced using the NTSC system, it is recorded in two horizontal scanning periods of horizontal scanning line numbers 17 and 18, as shown in FIGS. 3A and 3D).

The address signal A _K for kick is as shown in Fig. 6.
Consists of a total of 29 bits, including a 4-bit synchronization code 2
8, a 2-bit line identification code 29, a 2-bit audio identification code 30, a disk identification code in which the upper 4 bits of the 8 bits are 31a and the lower 4 bits are 31b, a 4-bit kick presence/absence instruction code 32, 4-bit track direction code 33, 4-bit track number code 34 and 1
The parity of the bits is 35. The synchronization code 28 has the same value ("C" in hexadecimal notation) as each of the synchronization codes 16 and 22 of the address signals A _C and _AT . Also, disk identification codes 31a and 31b
is a code for identifying that the disk has a track pattern as shown in Fig. 4, and all of the kick address signals A _K1 to A _K8 are in hexadecimal notation as shown in Fig. 7 A to H, respectively. "A" of
takes the value of Furthermore, the tightness presence/absence instruction code 32 is
This is a code that instructs whether or not to force the playback element to change the track by one track pitch (hereinafter referred to as "kicking") within the vertical blanking period. When the kick is "present", when it is "0", the kick is "absent", and each of the 4 bits is set to indicate the kick at the positions b, c, d, and a of the vertical blanking period recording part in order from the MSB to the LSB. Indicates presence or absence.

Furthermore, the hard direction instruction code 33 is a code that indicates the hard direction, and each of the 4 bits is
Indicates the kick direction at the vertical blanking period recording portions b, c, d, and a in order from MSB to LSB, and when the bit value is "1", the forward direction (inner direction in this case), " When it is "0", it instructs a kick in the opposite direction (in this case, toward the outer circumferential direction), and when the value of the corresponding bit of the kick presence/absence instruction code 32 is "0", it is set as "0". Additionally, track number code 3
4 is "0" to "3" in hexadecimal notation depending on the tight condition.
Here, as shown in FIGS. 7A to 7H, the address signal A _K1 recorded on the track to be played normally is set to "0", and the other tracks are set to "1". Ru.

7A to 7H show the hexadecimal values of the respective codes of the kick address signals A _K1 to _{A K8} recorded on the disk according to the present invention, respectively. In FIGS. 7A to 7H, the values of the synchronization codes 28 of address signals A _K1 to _{A K8} are all "C", and the address signals A _C ,
This value is the same as the _AT synchronization codes 16 and 22. Furthermore, the 4-bit value consisting of the line identification code 29 and the audio identification code 30 is "C" if recorded within one horizontal scanning period of the horizontal scanning line number 17, and "C" is recorded within one horizontal scanning period of the horizontal scanning line number 18. Those recorded within the period are given an "8".

Next, the values of the kick presence/absence instruction code 32 and the kick direction instruction code 33 and their instruction contents will be explained. First, as shown in FIG. 7A, the address signal A _K1 for kick is code 32, which is "5" in hexadecimal.
The value of code 33 is selected as the hexadecimal value of "4". The value of "5" in hexadecimal is "0101" in binary, and the second and fourth bits (LSB) are each "1", so the vertical blanking period recording parts c and a Code 32 indicates that the code is to be turned in the forward direction in the recorded part c, and in the reverse direction in the recorded part a, since the value of "4" in code 33 is "0100" in binary. It shows that. Further, the code 32 of the kick address signal A _K2 recorded in the track next to the kick address signal A _K1 is the 7th track.
As shown in Figure B, "B", the above code 33 is "A"
Therefore, it is shown that the vertical blanking period recorded portions b and d are kicked in the forward direction, and the vertical blanking period recorded portion a is kicked in the reverse direction.

As can be clearly inferred from the above explanation, the kick address signal shown in FIG.
A _K3 and A _K6 shown in FIG _. indicates a forward kick in the vertical blanking period recorded portion c, and E,
The kick address signal A _K5 shown in H, respectively.
A _K8 does not perform a kick for one rotation of the disk, and the address signal for the kick shown in G in the same figure.
A _K7 indicates a forward kick in the vertical blanking period recorded portion b. The values of the codes 32 and 33 of the pick address signals A _K1 to A _K8 are selected in this manner so that the pick-up playback element can accurately scan the track to be normally played during normal playback, which will be described later. This is so that even if a track other than the track to be normally played is played back, the track to be played normally can be quickly played back.

FIG. 9 shows the video signal of each frame recorded on the disk according to the present invention and the kick address signal A _K1 ~
This diagram shows the values of codes 32, 33, and 34 of A _K8 and the recording order of the divided audio signal portions in relation to each other. It is shown. However, the fourth
The discontinuous points in the sound shown in the figure are indicated by black triangles in FIG. In addition, the broken line "1'" shown in the divided audio signal order indicates the silent part of the 0.5 field period before the divided audio signal part "1" recorded on the first track, and since it is not actually recorded, it is shown as a broken line. . Further, subscripts a and b indicate the first half 0.5 field period and the second half 0.5 field period of the divided audio signal portion. In addition, the address signal for kick A _K1 ~
Codes 32, 33, and 34 of A _K8 are shown in FIG. 9 as being recorded over one field period for convenience of illustration, but this is to clarify the recording relationship, and in reality, As described above, the data is recorded in two horizontal scanning periods within the vertical blanking period.

Next, an example of a reproducing apparatus for reproducing a disc according to the present invention will be explained. FIG. 10 shows a block system diagram of an example of a disc playback device applied to the disc playback device previously proposed by the present applicant. In the figure, reference numeral 41 denotes a disk having the track pattern shown in FIGS. 4 and 9, which is placed on a turntable and is driven along with the turntable at high speed in the Y direction in the figure by a motor (none of which is shown). They can be rotated synchronously. Here, the rotation speed of the disk 41 is selected to be 900 rpm. The rotation of the disk 41 causes the playback needle 42 to move over the surface of the disk 41.
slides and scans.

The regeneration needle 42 is fixed to one end of a cantilever 43, and a permanent magnet 44 is fixed to the base side of the other end of the cantilever 43. cantilever 4
The portion where the permanent magnet 44 of No. 3 is fixed is surrounded by a tracking coil 45 and a jitter correction coil 46 which are fixed to the reproducing device. Since the left and right coil parts of the jitter correction coil 46 are wound in the same phase, they simultaneously act as attraction or repulsion to the permanent magnet 44 depending on the polarity of the jitter correction signal from the input terminal 47. , the cantilever 43 moves directly in the track tangential direction of the disk 41 to correct jitter caused by surface runout or eccentricity of the disk 41. The tracking coil 45 generates a magnetic field in a direction perpendicular to the magnetic field direction of the permanent magnet 44, and moves the cantilever 43 upward in the Z direction (track width direction) in accordance with the polarity of the tracking error signal from the tracking circuit 61. Displace it in one direction and with an amount of displacement depending on its size.

A resonant circuit whose resonant frequency changes in response to changes in capacitance formed between the disk 41 and an electrode fixed by vapor deposition on the rear end surface of the regeneration needle 42 in accordance with the intermittent row of pits; A circuit that applies a constant frequency to a resonant circuit, a circuit that detects the amplitude of a high-frequency signal whose amplitude changes according to the change in capacitance from the resonant circuit, and a circuit that detects the amplitude of a high-frequency signal whose amplitude changes according to the change in capacitance. The high-frequency reproduction signal taken out from the pick-up circuit 48, which consists of a circuit for positional amplification, is supplied to the demodulation circuit 49, where the main information signals of the main track (in this case, the video signal and the audio signal) are demodulated and output. While it is output from the terminal 53, a part of it is branched and supplied to _{the p3} detector 50 and band filters 51 and 52, respectively.

_p3 detector 50 detects the third tracking signal.
The frequency of _p3 is selected from among the reproduced signals, and a _p3 detection signal phase-synchronized with this is generated and applied to the switching pulse generator 57. Further, the band filter 51 selects the frequency of the first tracking signal _p1 from the reproduced signal and sends it to the switching circuit 5.
On the other hand, the bandpass filter 52 selects the frequency of the second tracking signal _p2 from the reproduced signal and sends it to the switching circuit 54.
is applied to the second input terminal of. The switching circuit 54 is caused to switch by a switching pulse from a switching pulse generator 57,
For example, during the period when the switching pulse is at a high level, each output terminal of the band filters 51 and 52 is connected to the detection circuit 5.
On the other hand, during the low level period, the output ends of the bandpass filters 51 and 52 are connected to the input ends of the detection circuits 59 and 58, respectively.

The switching pulse from the switching pulse generator 57 is generated by the detection signal from _{the p3} detector 50 or the kick pulse from the kick pulse generator 56 (excluding the kick pulse that came in during _{the p3} regeneration period), which will be described later. When this occurs, the polarity is reversed. In this way, the detection circuit 58 extracts the envelope detection output of the reproduced tracking signal from the outer sub-track of the main track to be reproduced, and the detection circuit 59 extracts the envelope detection output from the inner sub-track of the main track to be reproduced. The envelope detection output of the reproduced tracking signal is taken out and applied to the next stage differential amplifier 60. A tracking error signal having a polarity corresponding to the direction of track deviation and a level corresponding to the amount of track deviation is taken out from the differential amplifier 60, and this tracking error signal is used for desired driving by a tracking circuit 61 including a drive circuit, etc. After being converted into electric power, it is applied to the tracking coil 45, thereby displacing the reproducing needle 42 in a direction and displacement amount that corrects the upward tracking deviation in the radial direction of the disk 41.

Further, although not shown in the drawings, a pick-up device including a regenerating needle 42 is fed by a feed motor in the radial direction of the disk, thereby performing linear tracking.

Further, the main information signal demodulated by the demodulation circuit 49 is supplied from an output terminal 53 to a known color video signal reproduction system and an audio signal reproduction system (none of which are shown in the figure), respectively. After being converted into a reproduction audio signal of each channel, the signals are output to a monitor television receiver (not shown).

In the disc reproducing apparatus proposed by the present applicant, the disc reproducing apparatus according to the present invention is further provided with a kick control system for the reproducing needle 42, which includes a kick address signal reproducing circuit 55 and the like. That is, in FIG. 10, the demodulation circuit 4
The main information signal taken out from 9 is output terminal 53
On the other hand, it is supplied to the kick address signal reproducing circuit 55. The kick address signal reproducing circuit 55 detects and reproduces the kick address signal, and also determines the presence or absence of a kick and the kick direction based on the values of the codes 32 and 33. If the kick is present, the kick address signal reproducing circuit 55 detects and reproduces the kick address signal. Outputs a detection signal with the same polarity. Reference numeral 62 denotes a changeover switch, which is connected to the contact A side during conventional disc playback and selectively outputs the playback mode signal input to the terminal 63 to the kick pulse generator 56, and is connected to the contact B side during normal playback of the disc according to the present invention. The reproduced output of the kick address signal is selectively output to the kick pulse generator 56.

Next, the cases of the still motion playback mode and the normal playback mode of the disc according to the present invention will be explained. First, during still motion playback, the still motion playback mode signal is input from the input terminal 63 as in the conventional case. The pulse is supplied to the kick pulse generator 56 via the changeover switch 62, which generates a kick pulse for forcibly moving the reproducing needle 42 one track pitch in the opposite direction (toward the outer circumference in this case) every rotation period of the disk 41. This kick pulse is applied to the tracking coil 45 via the tracking circuit 61 and is applied to the regeneration needle 42.
By applying a force to move the needle toward the outer circumference every time the third tracking signal _p3 is reproduced, and at the same time maintaining the polarity of the output switching pulse of the switching pulse generator 57, the regeneration needle 4 is
2 is shifted outward by one track pitch within the vertical blanking period recording portion a, and the same track is repeatedly reproduced. The solid line in FIG. 11 shows the scanning locus of the playback needle 42 during still motion playback of the disk 41. Among the track portions on the disk 41 having the track pattern shown in FIG. 4, in which the color video signal of a movie film that is played back at 24 frames per second is recorded, one rotation is made from the recording position of the third tracking signal _p3 as the starting point. Since the video signal of the same frame is repeatedly recorded on the track that is formed, a completely still still image of the color video signal of the same frame can be obtained by repeatedly reproducing the same track. In addition,
The disk reproducing apparatus shown in FIG. 10 reproduces a color video signal recording disk of 24 frames per second of movie film at a field frequency of about 60 Hz.

Note that when playing this still motion, normally,
The reproduced audio signal is muted and is not produced, and the feed of the pickup device including the reproduction needle 42 is stopped.

Next, the operation of the disc according to the present invention during normal playback will be explained. During normal reproduction, the changeover switch 62 is switched to the contact low side, and the kick control signal obtained by decoding and reproducing the code by the kick address signal reproducing circuit 55 is applied to the kick pulse generator 56. Here, as mentioned above, for 1 second
In order to normally reproduce video signals from a movie film that is played at a rate of 24 frames as a video signal with a field frequency of 60 Hz from a disk on which the video signal is recorded, without any time axis deviation, it is necessary to
It is necessary to play back a frame (1/12 second) in 5 field periods (1/12 second). Therefore, the video signal for one frame must be played back for 2 field periods, and then the video signal for the next frame must be played back in 5 field periods (1/12 second). It is necessary to reproduce the signal based on the well-known 2-3 (or 3-2) pulldown method in which reproduction operations for three field periods are alternately repeated.

Thus, in the vertical blanking period recording portion a, kick address signals A K1 to A K8 whose code values are shown in FIGS. 7A to H, respectively, are recorded, and these reproduced address signals A _{K1 to} A _K8 Kick pulses corresponding to the code contents of A _K8 are generated and outputted from the kick pulse generator 56 to the switching pulse generator 57 and the tracking circuit 61, respectively. As a result, the regeneration needle 42 draws a scanning locus as shown by the solid line in FIG.

FIG. 13 shows the relationship between the scanning locus of the playback needle 42, the frames of the movie film being played, and the divided audio signal portions during normal playback. In Figure 13, 4th
The same parts as those in the figure are given the same reference numerals. 13th
In the diagram, each diagonal line at the bottom right indicates one track, the left side of the diagonal line indicates the recording position of the frame of the movie film of the recorded color video signal, and the number on the right side of the diagonal line indicates the recording position of the recorded divided audio signal portion. Indicates the recording position. The solid line portion of the diagonal lines above indicates the track portion of the recorded track that has been scanned for reproduction. Further, an arrow pointing to the left indicates that a recording portion a of the same track is to be ticked. Figure 12 and 1
As is clear from FIG. 3, the regeneration needle 42 moves from A to A to B to B to B to C to C to D in every field period.
D→D→E→E→F→F→... After the color video signal of the same frame is repeatedly played for 2 field periods of the frames of the recorded movie film, the color video signal of the next same frame is played back for 3 fields. Since the image is repeatedly reproduced for each period, a normally reproduced image without time axis deviation based on the well-known 2-3 pulldown method can be obtained.

On the other hand, as for the audio signal, as is clear from FIG. 13, the divided audio signal portions are sequentially reproduced in the division order, so that a normally reproduced audio signal is obtained.
Furthermore, in this case, the kick position of the playback needle 42 is located within the vertical blanking period recording portion c, avoiding the sound discontinuity point shown in FIG. 13, so the kick position may vary for some reason. However, there is no discontinuity in the reproduced audio due to a shock, and a normally reproduced audio signal can be obtained continuously.

By the way, the above is the address signal for the kick.
This is an operation during normal playback in which A _K1 , A _K2 , A _K4 , A _K6 and A _K7 are played back, but there may be cases where these kick address signals cannot be played back due to dropout or other reasons. Since the disc playback device is configured so that it does not perform kicking when the kicking address signal A _K is not reproduced, in the above case, the kicking address signals A _K1 , A _K2 , A _K4 , A _K6 that were not reproduced are or
Kick address signals _{A K2 ,} A _K3 , A _K5 , recorded on the track next to the recording track A K7 ,
A _K7 or A _K8 is played. For example, if the kicking address signal A _K1 recorded on the outermost track shown in FIG. _K2 is played. The kick address signal reproducing circuit 55 decodes the code of the kick address signal A _K2 , but as mentioned above, A _K2 is in the forward direction in the vertical blanking period recording portions b and d, and in the reverse direction in the recording portion a. Since the instruction indicates that the regeneration needle 4
2 is turned inward at the vertical blanking period recording portion b of the second track from the outermost track shown in FIG. 4, and is turned inward at the vertical blanking period recording portion d of the third track. In order to reproduce the kick address signal A _K3 , which is kicked to the outer circumferential side in the vertical blanking period recording portion a of the fourth track and recorded in the third track, this A After _{the K3} reproduction is performed, the scanning trajectory during normal reproduction as shown in FIG. 12 is drawn.

In this case, A→A→B→B→B→C→C→D→
The frames of a movie film to be played in this order are A→A→A→A→B→C→C→D→D→...
Since the images are reproduced in this order, a completely normal reproduced image cannot be obtained, but a normal reproduced image can be obtained in a short time. Also in the above case, a completely normal reproduced audio signal can be obtained.

As described above, the disk according to the present invention is
When the track is scanned and reproduced as shown in the figure, a completely still image can be obtained, and when the track is scanned as shown in Figure 12, a normal reproduced image with no time axis shift can be obtained. Normal playback audio can be obtained. Furthermore, since the color video signal of a motion picture film is recorded on the disk of this embodiment having the track pattern shown in FIG. You can get 5/8x slow motion playback images. Furthermore, during the normal playback described above, since every other track is played back, the conventional image information of 60 minutes on one side will be normally played back in 37 minutes and 30 seconds.

Note that the disk according to the present invention is not limited to one having the track pattern shown in _FIG . It may also be recorded separately. Further, the kicking address signal _AK is recorded at the position where the reproduction needle 42 is to be turned during still motion reproduction, that is, within the vertical blanking period recording portion a where the third tracking signal _p3 is recorded. It may also be recorded in other recording portions b, c, or d. Further, when the track number code 34 is "0", it is a track to be played normally, so the scanning locus of the playback needle 42 may be changed by identifying this on the playback side.

Also, the values of the disk identification codes 31a and 31b are
Although the explanation has been made so that the value is "AA" in hexadecimal notation, for example, the value of the address signal A _K1 for the lock may be set to "BF", and that of the other A _K2 to _{A K8} may be set to the value "BB". . In this case, the above values "BF" and "BB" are stored in the playback device in advance, and the code 3
It is also possible to draw the desired scanning locus without having to decode each value from 2 to 34.

Furthermore, since there are two channels of recording audio signals, one channel is sequentially arranged and recorded according to the scanning locus during normal playback as shown in Figure 4, and the other channel is used for other purposes (for example, 5/8x speed). For example, normal playback audio may be obtained during slow motion playback. Furthermore, although the above embodiment has been explained using the disk previously proposed by the present applicant as an example, it can also be applied to a light beam reading disk on which tracking signals _p1 to _p3 are not recorded (however, one rotation (It is preferable to use a disc on which video signals of four or more fields are recorded.)

Further, in FIG. 10, the kick address signal reproducing circuit 55 decodes the values of the disk identification codes 31a and 31b of the address signal _AK , and if the values are not predetermined values, the kick address signal reproducing circuit 55 decodes the disk identification codes 31a and 31b of the address signal AK, and if the values are not predetermined values, the kick address signal reproducing circuit 55 decodes the disk identification codes 31a and 31b of the address signal AK. Since it can be configured to generate a control signal, the changeover switch 62 can also be made unnecessary.

As described above, the information signal recording disk according to the present invention can be used for one rotation period equal to a plurality of field periods,
A pick-up playback element in which the video signal of the same frame of a movie film of 24 frames per second is repeatedly recorded, and the track is forcibly changed at least once per rotation when obtaining a normal playback image of the video signal. It is an information signal recording disk in which divided audio signal parts are sequentially arranged and recorded according to the scanning locus, and consists of a synchronization code, a disk type identification code, a kick presence/absence instruction code, and a kick direction instruction code. Since the track change address signal to instruct whether or not to change the track, the change direction, and the change position is recorded in at least one location for each revolution, software producers can freely record still images, normal images, and audio. A complete still image of a movie film video signal of 24 frames per second, normal playback images and normal playback audio at a field frequency of 60Hz with no time axis deviation can be selectively played back. The track change position can be indicated by the bit position of each code, and the presence or absence of track change and the direction of track change can be indicated by the bit value.Furthermore, the discontinuity of the audio signal can be detected at a position different from the forced track change position of the pick-up playback element. Since the points are arranged and recorded, even if the track is changed during playback, normal playback audio can be smoothly obtained without causing audio discontinuity at that position, and it is also possible to obtain normal playback audio smoothly without causing audio discontinuity at that position. It has the advantage of being able to smoothly obtain normally reproduced audio even if there is a slight positional shift.

[Brief explanation of the drawing]

FIG. 1 is a diagram schematically showing an example of a track pattern of an information signal recording disk proposed by the applicant;
FIG. 2 is a block system diagram showing an example of the recording system of the information signal recording disk according to the present invention, FIGS. 3A to 3D are signal waveform diagrams for explaining the operation of FIG. 2, and FIG. 4 is the present invention. A diagram showing a track pattern of an embodiment of an information signal recording disk, FIGS. 5A and 5B are diagrams showing an example of the structure of a chapter address signal and a time address signal, respectively, and FIG. 6 is an information signal according to the present invention. FIGS. 7A to 7H are diagrams showing an example of the configuration of the kick address signal recorded on the recording disk.
Figures 8A to 8C are diagrams showing the hexadecimal values of each code of the clock address signal shown in the figure, Figures 8A to C are diagrams each showing the hexadecimal values of predetermined codes of the time address signal, and Figure 9 is a diagram showing the hexadecimal values of each code of the time address signal. A diagram schematically showing an example of the relative recording positional relationship between the frames of a movie film recorded on the information signal recording disc according to the present invention, the predetermined code of the kick address signal, and the recording order of the divided audio signal portions. , FIG. 10 is a block system diagram showing an example of a reproducing apparatus for reproducing an information signal recording disk according to the present invention, FIG. 11 is a diagram showing an example of a track scanning locus during still motion reproduction, and FIG. 12 is a diagram showing an example of a track scanning locus during still motion reproduction. FIG. 13 is a diagram schematically showing an example of the relationship between the track scanning locus during normal reproduction and the signal recorded on the track. 1, 2... Audio signal source, 5, 9... Mixer, 6
... Color video signal source, 10 ... Address signal generation circuit, 11 ... Tracking signal generator, 1
6, 22, 28...Synchronization code, 17, 23, 2
9... Line identification code, 18, 24, 30...
Voice identification code, 31a, 31b... Disk identification code, 32... Kick presence/absence instruction code, 33
... Kick direction instruction code, 34 ... Track number code, 41 ... Information signal recording disk (disk), 42 ... Reproduction needle, 43 ... Cantilever,
44... Permanent magnet, 49... Demodulation circuit, 54...
Switching circuit, 55... Kick address signal regeneration circuit, 56... Kick pulse generator, 60
...Differential amplifier.

Claims (1)

[Claims] 1. To one rotation period equal to a plurality of field periods;
A pick-up in which the video signal of the same frame of a movie film with 24 frames per second is repeatedly recorded multiple times, and the track is forcibly changed at least once per revolution when obtaining a normal playback image of the video signal. It is an information signal recording disk in which divided audio signal parts are sequentially arranged and recorded according to the scanning locus of the playback element, and includes a synchronization code, a disk type identification code, a kick presence/absence instruction code, and a kick direction instruction code. A track change address signal for instructing the presence or absence of a forced track change, the change direction, and the change position is recorded in at least one location for each rotation, and is different from the forced track change position of the pick-up playback element. An information signal recording disk characterized in that discontinuous points of an audio signal are arranged and recorded at positions.