JPS62214557A - Video disk and its recoding and reproducing device - Google Patents

Abstract

PURPOSE:To effectively read out a picture and digital data of related block structure by regulating the length after interleaving and position of end part in blocks made by dividing digital data signals. CONSTITUTION:Digital data signals are inputted to an EFM encoder 9 through a memory 41 and the memory 41 is controlled by a position detecting means 42 that detects specified position of video signals. By such constitution, digital data signals are divided into blocks constituting of specified bits, and the length after interleaving is interleaved to become longer than one field of television video signals shorter than one frame. The end part of the block after interleaving is recorded near a position to which vertical signals of the television video signals correspond. Thus, digital data of a series of pictures and a series of related block structure can be read at high efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a video disc on which a television video signal is recorded, and a recording and reproducing apparatus thereof.

[Prior Art] Recently, disks that record information at high density have been developed and commercialized. Typical examples are video discs and digital audio discs.

There are several types of methods, but in the case of optical video discs, the spectrum is as shown in FIG. In other words, the television video signal has a sync chip level of 7.6M1-(z and a white level of 9.6M1-(z).
By frequency modulating the carrier wave so that it becomes 3 MHz, the accompanying audio signals such as left and right stereo signals and bilingual signals can be adjusted to 2.3 MHz and 2.8 MHz.
Each signal is recorded by frequency modulating a carrier wave.

On the other hand, PC in optical digital audio disc
As shown in FIG. 7, the spectrum of the EFM signal of the M-converted left and right stereo audio signals occupies a band of approximately 2 MHz or less.

As mentioned above, on a video disc, the band below 2M)-12 is almost empty, so such EFM signals can be frequency-division multiplexed and recorded on the video disc. The spectrum in this case is as shown in FIG. 8, and it can be seen that both signals can be sufficiently separated.

FIG. 9 shows a block diagram of such a video disc recording device. That is, a television video signal whose high-frequency components have been pre-emphasized by a pre-emphasis circuit 1 is input to an adder 3 which is subjected to frequency modulation by an FM modulator 2.

Another chi 1? The channel audio signal is pre-emphasized by pre-emphasis circuits 4 and 5, frequency-modulated by an FM modulator 6.7, and input to an adder 3. Furthermore, the audio signal of one channel is converted into digital (PCM) by a PCM encoder 8, EFM-modulated by an EFM encoder 9, and then processed by a low-pass filter 1.
After unnecessary high-frequency components are removed by 0, the signal is input to the adder 3 via the pre-emphasis circuit 11. Therefore, in the adder 3, the FM signal (No. 8) of the video signal, the FM signal of the 2-channel audio signal, and the EFM signal of the 2-channel audio signal are added, and after being multiplexed by the limiter 12, the optical modulator As a result, the laser beam output from the laser light source 14 is modulated in accordance with the signal, and is irradiated via the objective lens 15 onto the recording ratio A17 rotated by the motor 16, where the signal is recorded. Since the technique for forming a disk with such a recording ratio of !17 is well known, detailed description thereof will be omitted.

FIG. 10 shows a block diagram of a reproducing apparatus for a disc formed in this manner. A laser beam emitted from a pickup 23 is irradiated onto a disk 22 rotated by a motor 21 through an objective lens 24.
The reflected light passes through the objective lens 24 to the pickup 23.
The light is received by and a reproduced signal is output. The reproduced RF signal is outputted via the amplifier 25, of which the F of the video signal is
The M carrier wave components pass through a bandpass filter 26 and become FM.
The signal is supplied to a demodulator 27, demodulated, and then output via a de-emphasis circuit 28. The FM carrier components of the audio signals of the two channels are each supplied to FM demodulators 31.32 via bandpass filters 29.30, where they are FM demodulated and then de-emphasis circuit 33.
．． 34. The rough EFM signal component is separated by a low-pass filter 35 and supplied via a de-emphasis circuit 36 to an EFM decoder 37 and a rough PCM decoder 38, where it is demodulated by EFM and PCM, respectively.
It is demodulated and output as an analog signal. Therefore, the viewer can select and listen to a higher fidelity audio signal as desired along with the video signal.

[Problems to be Solved by the Invention] By the way, it is conceivable to record a digital data signal instead of an audio signal as the EFM signal. Since digital data signals, unlike audio signals, are not necessarily continuous signals, it may be advantageous to have a block structure. The player can be simple or complex depending on how the positional relationship between the block and the corresponding video signal on the disc is selected.

[Means for solving the problem - disk and recording device] FIG. 1 shows a block diagram of a recording device of the present invention, and parts corresponding to those in FIG. 9 are given the same reference numerals. Yes, the details are omitted.

In the case of FIG. 9, two channels of audio signals were input to the EFM encoder 9 via the PCM encoder 8, but in the present invention, digital data signals are input to the EFM encoder 9 via the memory 41. (Of course, a changeover switch or the like may be provided so that either the audio signal or the digital data signal is selectively input). Reference numeral 42 denotes a position detection means, which detects a predetermined position of the video signal and controls the memory 41. Other video signal pre-emphasis circuit 1, FM modulator 2, adder 3. Two channel audio signal pre-emphasis circuit 4.5, FM
A modulator 6.7, a low-pass filter 10 in the signal path of the EFM encoder, a pre-emphasis circuit 11, a limiter 12 arranged in the signal path from the adder 3, and an optical modulator 13.
, the laser light source 14, the objective lens 15, the motor 16, the recording master 17, etc. are the same as those shown in FIG.

[Function of disk and recording device] The function will now be explained. The video signal and the audio signals of the two channels are pre-emphasis circuit 1.4.5, F.
The frequency modulation is performed by the M modulator 2.6.7 and the adder 3, and then the signals are added, as in the case described above. In the present invention, the position detection means 42 detects a predetermined position of the video signal.

The detected position may be any vertical synchronizing signal position, and may be, for example, the position indicated as S in FIG. 5 among the vertical synchronizing signals.

In FIG. 5, arrows indicate positions where the pickup can jump to reproduce still images on a CAM disk in which one frame (two fields) of video signals are recorded per revolution. In the case of a normal television video signal, odd fields (A1, 81.C1, Dl, El
, Fl) followed by an even field (A2.B2.C
2, C2°F2. F2) makes up one screen, so the area near the position of the vertical synchronization signal that changes from an even field to an odd field is a jumpable position (
Figure 5(a)). On the other hand, when a movie film with 24 frames per second is subjected to so-called 3-2 pulldown to produce a television video signal, the portions where the same screen is recorded in two consecutive fields (al, C2, cl, c2... e
l, C2) and a portion where the same screen is recorded for three consecutive fields (bl, b2.b3.di,
d2, d3. t1. f2. The position that can be jumped to for still image playback is the position where two fields before and one field before are on the same screen (FIG. 5(b)). Therefore, the position S detected by the position detecting means 42 is the position of the synchronization signal one frame (two fields) before the jumpable synchronization signal position indicated by this arrow. In a portion where the same screen is recorded for three fields, there are two positions S, and one of them is selected.

After a predetermined period of time has elapsed since the position detection means 42 detected the position jJs, the memory 41 outputs the digital data signal that has been stored up to that point. This digital data signal is supplied to an EFM encoder 9, subjected to processing such as interleaving, and then passed through a low-pass filter 10. The signal is input to the adder 3 via the pre-emphasis circuit 11 and added to the frequency-modulated video signal and audio signal. As a result, the tail of the digital data signal is located at the position S of the video signal.
It will be placed and recorded near the position corresponding to .

By the way, the length of one block of digital data signal is
It can be set to any value such as 1 kilobyte or 2 kilobytes, but for example, 2. A digital data signal of 352 kilobytes (=24 x 98), or 18°816 gigobints, is
For example, if the length before interleaving is approximately 13.3 ms, the dispersion due to interleaving of the EFM encoder of an optical digital audio disc will cover a length of approximately 14.7 ms, so the length after interleaving of one block will be: It will be approximately 28m5. Since the interval of vertical synchronization signals (length of one field) is approximately 16.7 ms, the length before interleaving of one block is shorter than the interval of vertical synchronization signals (length of one field), but the length after interleaving is shorter than the interval of vertical synchronization signals (length of one field). is longer than the length of one field,
It will be shorter than the length of one frame. Therefore, for example, five blocks of digital data signals D1 to Ds (fourth frame) correspond to two frames of video signals A and B (FIG. 4(a)).
If Figure (b)) is interleaved and recorded, the tail of the fifth block Ds' after interleaving corresponds to the vertical synchronization signal immediately after the second field B2 of frame B (Figure 4(d)). Recorded near the location. However, since it is preferable to jump back during playback in the vertical retrace interval, it is preferable not to record digital data signals within the vertical retrace interval that includes the vertical synchronization signal.

Then, mutually adjacent block signals are convolved,
The beginning of the first block D1' after interleaving is
The position corresponds to the second field of the previous frame, which does not necessarily correspond in content (FIG. 4(C)).

[Means for solving the problem - reproducing device] FIG. 2 shows a block diagram of the reproducing device.
The same reference numerals are given to the parts corresponding to those in FIG. In the playback device according to the present invention, the output of the EFM decoder 37 is
1 via data decoder 52 or PCM decoder 3
8. The switch 51 is set to E in response to a command from a microcomputer, etc. (not shown).
PCM if the audio signal is recorded as an FM signal
It is possible to switch to the decoder 38 side, or to the data decoder 52 side if a digital data signal is recorded. Of course, if the PCM decoder 38 can be shared for digital data signals, the data decoder 52 can be omitted and the switch 51 can be used as the PCM decoder 3.
It may be provided on the output side of 8. 53 is a switch for squelching the video signal from the de-emphasis circuit 28.

54 is a tracking control circuit, which includes an equalizer 55 to which the tracking error signal output from the amplifier 25 is input, a loop switch 56 of the tracking servo loop, an adder 57, and a drive amplifier 58 that drives a tracking actuator (not shown). It consists of The video signal output from the de-emphasis circuit 28 is input to a synchronization separation circuit 59 and further to a vertical synchronization separation circuit 60, where the vertical synchronization signal is separated and detected. The vertical synchronization signal detection signal is supplied to a jump pulse generation circuit 61 and a squelch control circuit 62. 63 is a memory control circuit that controls the memory (RAM 75 in FIG. 3) of the data decoder 52. Jump pulse generation circuit 6
1. A jump command signal, a squelch command signal, and a memory control signal are output from the microcomputer to the squelch control circuit 62 and memory control circuit 63, respectively.

[Operation 1 of Reproducing Apparatus The operation when the EFM signal is not a digital data signal is the same as in case (e) above, so it will be omitted, and only the case where it is a digital data signal will be explained. Frame A
Alternatively, when a search command for digital data 01' to Os' is issued from the microcomputer, the loop switch 56 is turned on, and the search operation for frame A or digital data D1' to Os' is started, and the squelch control circuit 62 turns on the switch 53 to squelch the video signal. When frame A or digital data D1' to Os' is retrieved, the loop switch 56 is closed, the tracking control device 54 is activated, and normal playback operation begins. A] Out of the reproduced signals from B 25, the EFM signal is passed through the low-pass filter 35.
, EFM decoder 3 via de-emphasis circuit 36
7 and is EFM demodulated. The EFM demodulated signal is input to the data decoder 52 via the switch 51, and is stored in a predetermined memory and processed in response to a signal from the memory control circuit 63. On the other hand, when the storage operation of the last block Ds' of the digital data is completed, a jump command is issued to the jump pulse generation circuit 61 as shown in FIG. Then, the digital pulse generation circuit 61
then outputs a jump pulse to the adder 57 at the timing when the vertical synchronization signal is detected by the vertical synchronization separation circuit 60 (of course, if the jump pulse is to be generated immediately after reading the last block Ds', the next (There is no need to wait until the vertical sync signal is detected.) Therefore, the tracking actuator is driven, and the pickup 23 moves the second field B2 of frame B and the first field B2 of frame C.
Jump back one track (frame) from the vicinity of the vertical synchronization signal between field C1 to the vicinity of the vertical synchronization signal between the second field A2 of frame A and the first field 81 of frame B. Thereafter, the operation of reproducing frame B and then carrying out one track jump is repeated, and then frame A is reproduced as a still image (FIG. 4(e)). On the other hand, the squelch control circuit 62 closes the switch 53 and cancels the squelch when it reaches a position near the vertical synchronization signal immediately before frame B for the first time. Therefore, the user only sees the still image of frame B (Figure 4(f)).
). When the processing of the digital data signal is completed, this still image reproduction operation is also canceled and the next operation is started.

FIG. 3 shows a more detailed block diagram of EFM decoder 37 and data decoder 52 (switch 51 between them is omitted). That is, EFM decoder 37
, the input EFM signal is passed through the waveform shaping circuit 71.
The signal is waveform-shaped, demodulated by an EFM demodulator 72, and temporarily stored in a RAM 73 of, for example, 16 kilobits. After processing such as deinterleaving, an error detection and correction circuit 74 detects and corrects errors. In the data decoder 52, the digital data is temporarily stored in the RAM 75, read out and other processes are performed by the control signal from the memory control circuit 63, and the error detection and correction circuit 76 performs error detection and correction before outputting the data. ing. For example, if the size of the RAM 75 is approximately 38 kilobits for two blocks, it is possible to import the digital data for one image at a time, but it is approximately 19 kilobits for one block.
It can also be expressed in kilobits. In this way, the length of the series of digital data recorded on the disk is R
If the capacity of AM75 exceeds the capacity that can be stored at one time (of course, it may not exceed the capacity), the vertical sync signal from the vicinity of the vertical sync signal immediately before the first block D1' to the vertical sync signal immediately after the last block Ds'. , and a jump back operation from the vicinity of the vertical synchronization signal immediately after the last block D5' to the vicinity of the vertical synchronization signal immediately before the first block D1' (regardless of the path), It is also possible to sequentially store and process the next block after the once stored digital data has been processed. Meanwhile, the field or frame to be squelched in the video output can be arbitrarily selected. For example, it is possible to record the same image in frames A, B, C, etc., and always play it back as a still image during the jump repetition operation.The start and end points for repeating the playback operation and the jump back operation can be set, for example, at the As shown in Figure 4(e), regardless of the route, the frame t1 is played back by 2 tracks, then the frame t1 is played back as a still image (4th track jump back).
Figure (M)) can also be used. Furthermore, for example, Fig. 4 (
As shown in FIG. M')) In either case, the search target position is S
But S' is also fine.

If the length of digital data is 1 block, the length after interleaving of 1 block, which is the minimum unit, is shorter than 1 frame, and the end part can be jumped as described above instead of the position of all vertical synchronization signals. By setting the position near the position S of the vertical synchronization signal, the squelch of the video signal can be canceled at the time when the position S is searched, and the squelch time can be shortened. Mata Ji V
Regarding the disc location, it is possible to ensure compatibility with ordinary video discs that are already on the market.

[Effects] As described above, in J3 of the present invention, in a video disc in which a television video signal and a digital data signal are frequency-divided and multiplexed onto the same track, the digital data signal is divided into blocks each consisting of predetermined bits. Interleaving is performed so that the length of the block after interleaving is longer than one field of the television video signal and shorter than one frame, and the tail of the digital data signal is located near the position corresponding to the vertical synchronization signal. Since the digital data is recorded in such a manner that a series of screens and a series of block-structured digital data related thereto can be efficiently read out.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the recording device of the present invention, FIG. 2 is a block diagram of the playback device, FIG. 3 is a more detailed block diagram of a part of the playback device, and FIG. 4 is the recording and playback mode. Fig. 5 is a schematic plan view of the field of a television video signal, Fig. 6 is a spectrum diagram of an optical video disc, Fig. 7 is a spectrum diagram of an EFM signal, and Fig. 8 is a recording EFM signal. FIG. 9 is a block diagram of a conventional optical digital audio disc recording apparatus, and FIG. 10 is a block diagram of its reproducing apparatus. 1.4.5.11... Pre-emphasis circuit 2
．． 6.7 FM modulator 3 Adder 8 PCM encoder 9 EFM encoder 10 Low pass filter 12 ...Limiter 13...Light modulator 14...Laser light source 15.24...One objective lens 17...Recording master 22... ...Video disc 23...Pickup 25...
...Amplifier 26.29.30...Band pass filter 27.31.32...FM demodulator 28
．． 33.34...De-emphasis circuit 37.
... EFM decoder 38 ... PCM decoder 41 ... - Memory 42 ... Position detection means 51.53 ... Switch 52 ...・Data decoder 54...Tracking control circuit 61...
・Jump pulse generation circuit 73.75...RA
M Patent application Person Pioneer Co., Ltd. Figure 6 Capacity frequency (t4Hz) No. 7■1 Shield U return 71 (MHzλ□ Procedural amendment book form) 21 Name of the invention 1-4-1 Meguro, Meguro-ku, Tokyo 153 Japan (501
) Pioneer Co., Ltd. (shipped on May 27, 1986) 5. Amendment to the drawing procedure to be amended by Hakuju 1. Indication of the case 1985 Patent Application No. 56461 2. Title of the invention: Video discs and their recording and playback. Apparatus 3, Relationship with the case of the person making the amendment Patent Applicant Address Address: 1-4-1 Meguro, Meguro-ku, Tokyo 153 Name (501) Ionia Co., Ltd. Seiya Matsumoto (763) 2111 (Main Representative) )゛2 Specification (corrected full text) 1. Title of the invention Video disc and its recording and reproducing device 2. Claims <1) A television video signal and a digital data signal are frequency-divided and recorded on the same track. In a multiplexed video disc, the digital data signal is divided into blocks each consisting of predetermined bits, and interleaved so that the length after interleaving is longer than one field and shorter than one frame of the television video signal. , wherein the interleaved tail portion of a digital data signal consisting of one or more blocks is recorded ahead of the vicinity of a position corresponding to a vertical synchronization signal of the television video signal. (2) In a recording device that frequency-divides a television video signal and a digital data signal and multiplex-records them on the same track of a video disk, the television video signal is modulated and the digital data signal is made up of predetermined bits. divided into blocks, and interleaved so that the length after interleaving is longer than one field and shorter than one frame of the television video signal,
detecting a vertical synchronization signal from the television video signal;
arranging the digital data signal such that the tail portion of the digital data signal made up of the above blocks after undergoing modulation such as interleaving is located ahead of the vicinity of the position corresponding to the detected vertical synchronization signal; A recording device characterized in that the modulated signal of the television video signal and the digital data signal are added together and recorded on the video disc. (3) A television video signal and a digital data signal are frequency-divided and multiplexed onto the same track, and the digital data signal is divided into blocks each consisting of predetermined bits, and the length after interleaving is the same as that of the television video. The digital data signal is interleaved so that it is longer than one field and shorter than one frame, and the tail part after undergoing modulation such as interleaving of a digital data signal consisting of one or more blocks is the vertical synchronization signal of the television video signal. In a playback device for a video disc recorded ahead of the vicinity of a corresponding position, a filter means separates the digital data signal and the modulation signal of the television video signal from the playback signal of the video disc, and The digital data signal is reproduced from the beginning part to the end part, and the beginning part of the block is ahead of a predetermined position of the television video signal after the end part of the block of the digital data signal, and the beginning part of the block is A playback device characterized in that it plays back at least one frame or field of the television video signal that is a field or frame recorded after a vertical synchronization signal near a corresponding position. 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a video disc on which a television video signal is recorded, and its recording and reproduction 8@. [Prior Art] Recently, disks that record information at high density have been developed and commercialized. Typical examples are video discs and digital audio discs. There are several types of methods, but in the case of optical video discs, the spectrum is as shown in FIG. In other words, the sync chip level of a television video signal is 7.6MHz. By frequency modulating the carrier wave so that the white level is 9.3MHz, the accompanying audio signals such as left and right stereo signals and bilingual signals can be adjusted to 2.3MHz.
z and 2.8 MHz carrier waves are respectively recorded by frequency modulation. On the other hand, PC in optical digital audio disc
As shown in FIG. 7, the spectrum of the EFM signal of the M-converted left and right stereo audio signals occupies a band of approximately 2 MHz or less. As mentioned above, since the band below 2 MHz is almost empty on a video disc, such an EFM signal can be frequency division multiplexed and recorded on the video disc. The spectrum in this case is shown in Figure 8,
It can be seen that both signals can be sufficiently separated. FIG. 9 shows a block diagram of such a video disc recording device. That is, a television video signal whose high-frequency components have been pre-emphasized by the 19127192 circuit 1 is input to the adder 3 where the frequency is modulated by the FM modulator 2. Also, the audio signal of one channel is 19127192
The signals are pre-emphasized by circuits 4 and 5, frequency-modulated by FM modulators 6 and 7, and input to adder 3. Furthermore, the audio signal of one channel is digitized (PCM) by a PCM encoder 8, EFM-modulated by an EFM encoder 9, and then processed by a low-pass filter 10.
After unnecessary high-frequency components are removed, the signal is input to the adder 3 via the pre-emphasis circuit 11. Therefore, in the adder 3, the FM signal of the video signal, the FM signal of the 2-channel audio signal, and the E of the 2-channel audio signal are combined.
The FM signals are added together, multiplexed by a limiter 12, and then supplied to an optical modulator 13. As a result, the laser beam output by the laser light source 14 is modulated in accordance with the signal, and is irradiated via the objective lens 15 onto the recording source 117 rotated by the motor 16, thereby recording the signal. Since the technique for forming a disk from such a recording master 17 is well known, detailed description thereof will be omitted. FIG. 10 shows a block diagram of a reproducing apparatus for a disc formed in this manner. A laser beam emitted from a pickup 23 is irradiated onto a disk 22 rotated by a motor 21 through an objective lens 24.
The reflected light passes through the objective lens 24 to the pickup 23.
The light is received by and a reproduced signal is output. The reproduced RF signal is outputted via the amplifier 25, of which the F of the video signal is
The Mlffl transmission component passes through the bandpass filter 26 and is supplied to the FM demodulator 27, where it is demodulated and then
It is output via the 7122 circuit 28. Furthermore, the FM 11!2 transmission components of the audio signals of the two channels are sent to the FM demodulator 31 via band pass filters 29 and 30, respectively.
．． 32, where it is FM demodulated and then output via de-emphasis circuits 33 and 34. Further E
The FM signal component is separated by a low-pass filter 35,
EFM decoder 37 via de-emphasis circuit 36
, are roughly supplied to the PCM decoder 38, where each E
FM demodulation and PCM demodulation are performed and an analog signal is output. Therefore, the viewer can select and listen to a higher fidelity audio signal as desired along with the video signal. [Problems to be Solved by the Invention] By the way, it is conceivable to record a digital data signal instead of an audio signal as the EFM signal. Since the digital data signal, unlike the audio signal, is not necessarily an M-continuous signal, it seems advantageous to use the block 'f4Ti. The player can be simple or complex depending on how the positional relationship between the block and the corresponding video signal on the disc is selected. [Means for Solving the Problems - Disk and Recording Device 1 FIG. 1 shows a block diagram of the recording device of the present invention, and parts corresponding to those in FIG. 9 are given the same reference numerals. Yes, the details are omitted. In the case of FIG. 9, two channels of audio signals were input to the EFM encoder 9 via the PCM encoder 8, but in the present invention, digital data signals are input to the EFM encoder 9 via the memory 41. (Of course, a changeover switch or the like may be provided so that either the audio signal or the digital data signal is selectively input). Reference numeral 42 denotes a position detection means, which detects a predetermined position of the video signal and controls the memory 41. Pre-emphasis circuit 1 for the isthmus image signal, FM modulator 2, adder 3. 19127122 circuit 4, 5 for the audio signal of two channels, FM
Modulators 6 and 7, a low-pass filter 10 in the signal path of the EFM encoder, a pre-emphasis circuit 11, a limiter 12 placed in the signal path from the adder 3, and an optical modulator 13
, the laser light source 14, the objective lens 15, the motor 16, the recording master 17, etc. are the same as those shown in FIG. [Function of disk and recording device] The function will now be explained. The video signal and the two channel audio signals are 19127122 circuit 1.4.5, F
As in the case described above, the signals are frequency-modulated by the M modulators 2, 6.7 and the enhancer 3 and then added. In the present invention, the position detection means 42 detects a predetermined position of the video signal. The detected position may be any vertical synchronizing signal position, and may be, for example, the position indicated as S in FIG. 5 among the vertical synchronizing signals. In FIG. 5, the arrows indicate positions where the pickup can jump to reproduce still images on a CAV disc in which one frame (two fields) of video signals are recorded per revolution. In the case of a normal television video signal, odd fields (A1, 81.CI, DI, E
l, Fl) followed by an even field (A2, 82 .
C2, C2°F2. Since one screen is constructed by F2), the position near the vertical synchronization signal where the even field changes to the odd field is a jumpable position (FIG. 5(a)). On the other hand, when a movie film with 24 frames per second is subjected to so-called 3-2 pulldown to produce a television video signal, the portions where the same screen is recorded in two consecutive fields (al, C2, cl, c2...
el, C2) and a portion where the same screen is recorded for three consecutive fields (bl, b2.b3.dl
,d2,d3. f1. f2. f3)
The position that can be jumped to for still image playback is the position where two fields before and one field before are on the same screen (Fig. 5(b)).Therefore, the position S detected by the position detection means 42 is , is the position of the synchronization signal one frame (two fields) before the jumpable synchronization signal position indicated by this arrow.In the part where the same screen is recorded for three fields, there are two positions @S. However, one of them is selected. After a predetermined period of time has elapsed since the position detecting means 42 detected the position S, the memory 41 outputs the digital data signal that has been stored up to that point. The digital data signal is supplied to the EFM encoder 9, subjected to processing such as interleaving, and input to the adder 3 via the low-pass filter 10 and pre-emphasis circuit 11, where it is added to the frequency-modulated video signal and audio signal. As a result, the tail of the digital data signal is positioned and recorded in front of the position corresponding to the position S of the video signal.By the way, the length of one block of the digital data signal is:
It can be set to any value such as 1 kilobyte or 2 kilobytes, but for example, 2 kilobytes can be set according to the block length (98 frames (a frame is 24 bytes)) of the audio signal before EFM modulation on an optical digital audio disc. .352 kilobytes I- (=24X98), that is, 18°816 kilobits of digital data signal
For example, if the length before interleaving is approximately 13.3 Ils, the dispersion due to interleaving of the EFM encoder of an optical digital audio disc will cover a length of approximately 14.711 seconds, so the length after interleaving of one block will be: Approximately 28113. The vertical synchronization signal interval (length of one field) is approximately 16.7I
ls, the length of one block before interleaving is shorter than the vertical synchronization signal interval (the length of one field), but the length after interleaving is longer than the length of one field and shorter than the length of one frame. Therefore, for example, 5 blocks of digital data signals D1 to D correspond to 2 frames of video signals @A and B (Fig. 4(a)).
s (FIG. 4(b)) after a predetermined time has elapsed from the position S in front of the television frame A.
When recording starts from , the tail of the fifth block Ds' after interleaving is the second field B of frame B.
It is recorded in front of the position corresponding to the vertical synchronization signal (FIG. 4(d)) immediately after 2. However, since it is preferable to jump back during playback in the vertical retrace interval, it is preferable not to record digital data signals within the vertical retrace interval that includes the vertical synchronization signal. Then, mutually adjacent block signals are convolved, and the beginning of the first block D+' after interleaving exists in the previous frame, which does not necessarily correspond in content (Fig. 4(C)).
). By not using the data in blocks D+ and D2 or making them invalid data, it is possible to avoid related data from existing in the previous frame as described above. however,
In this case, the data Φ will decrease by that amount. Means for Solving Problem C - Reproducing Apparatus 1 FIG. 2 shows a block diagram of the reproducing apparatus Φ.
The same reference numerals are given to the parts corresponding to those in FIG. In the playback device according to the present invention, the output of the EFM decoder 37 is
1 via data decoder 52 or PCM decoder 3
8. The switch 51 is set to E in response to a command from a microcomputer, etc. (not shown).
FM (if an audio signal is recorded as No. 8, it is switched to the PCM decoder 38 side, and if a digital data signal is recorded, it is switched to the data decoder 52 side. Of course, the digital data signal If the PCM decoder 38 can be shared, the data decoder 52 may be omitted and the switch 51 may be provided on the output side of the PCM decoder 38. 53 is a switch that squelches the video signal from the de-emphasis circuit 28. 54 is a tracking control circuit, and amplifier 2
5, a tracking servo loop loop switch 56, an adder 57, and a drive amplifier 58 that drives a trunking actuator (not shown). The video signal output from the de-emphasis circuit 28 is input to a sync separation circuit 59 and further to a vertical sync separation circuit 60, where the vertical sync signal is separated and detected. The vertical synchronization signal detection signal is supplied to a jump pulse generation circuit 61 and a squelch control circuit 62. 63 is the memory of the data decoder 52 (RAM 7 in FIG.
5) is a memory control circuit that controls. A jump command signal, a squelch command signal, and a memory control signal are output from the microcomputer to the jump pulse generation circuit 61, squelch control circuit 62, and memory control circuit 63, respectively. [Operation of reproduction device] The operation when the EFM signal is not a digital data signal is the same as that described above, and therefore will be omitted, and only the case where it is a digital data signal will be explained. When a search command for frame A or digital data D+' to Ds' is issued from the microcomputer, the loop switch 56 is turned on, and the search operation for frame A or digital data D+' to Ds' is started, and squelch control Circuit 62 opens switch 53 to squelch the video signal. When frame A or digital data D+' to D5' is retrieved, the loop switch 56 is closed, the tracking control device @54 is activated, and normal playback operation begins. Of the reproduced signals from the amplifier 25, the EFM signal is passed through a low-pass filter 35,
EFM decoder 37 via de-emphasis circuit 36
The signal is inputted into the EFM demodulator. The EFM demodulated signal is input to the data decoder 52 via the switch 51, and is stored in a predetermined memory and processed in response to a signal from the memory control circuit 63. On the other hand, when the storage operation of the last block Ds' of digital data is completed (Fig. 4 (
(+>), a jump command is issued to the jump pulse generation circuit 61. Then, the jump pulse generation circuit 61
Next, a jump pulse is output to the adder 57 at the timing when the vertical synchronization signal is detected from the vertical synchronization separation circuit 60 (of course, if the jump pulse is to be generated immediately after reading the last block D5', the next vertical There is no need to wait until a synchronization signal is detected). Therefore, the tracking actuator is driven, and the pickup 23 picks up the second field A2 of frame A and the first field B1 of frame B from the vicinity of the vertical synchronization signal between the second field B2 of frame B and the first field C1 of frame C.
One track (frame) near the vertical synchronization signal between
Jump back. After that, play frame B and then
The track jump back operation is repeated to reproduce frame B as a still image (FIG. 4(e)). On the other hand, when the squelch control circuit 62 first reaches a position near the vertical synchronization signal immediately before frame B, it closes the switch 53 and cancels the squelch. Therefore, the user only sees the still image of frame B (FIG. 4(f)). When the processing of the digital data signal is completed, this still image reproduction operation is also canceled and the next operation is started. FIG. 3 shows a more detailed block diagram of EFM decoder 37 and data decoder 52 (switch 51 between them is omitted). That is, EFM decoder 37
, the input EFM signal is passed through the waveform shaping circuit 71.
The signal is waveform-shaped, demodulated by an EFMI modulator 72, and temporarily stored in a RAM 73 of, for example, 16 kilobits. After processing such as deinterleaving, an error detection and correction circuit 74 detects and corrects errors. In the data decoder 52, the digital data is temporarily stored in the RAM 75, read out and other processes are performed by the control signal from the memory control circuit 63, and the error detection and correction circuit 76 performs error detection and correction before outputting the data. ing. If the capacity of the RAM 75 is made larger than the data capacity of a series of digital data, it is possible to take in all the necessary digital data at once, but it is also possible to take in about 19 kilobits for one block. In this way, a series of nine digital data recorded on a disk can be transferred to the RA.
If M75 exceeds the capacity that can be stored at one time (of course, it may not exceed the capacity), the vertical synchronization signal from the vicinity of the vertical synchronization signal immediately before the first block D+' to immediately after the block Ds' after R Repeat the playback operation to the vicinity of the signal and the jump back operation from the vicinity of the vertical synchronization signal immediately after the last block Ds' to the vicinity of the vertical synchronization signal immediately before the first block D+' (regardless of the route) , it is also possible to sequentially store and process the next block after the processing of the once stored digital data is completed. Meanwhile, the field or frame to be squelched in the video output can be arbitrarily selected. For example, record the same image in frames A, B, C, etc.
It is also possible to play back an apparently still image during a jump repetition operation, and the start and end points of repeating the playback operation and jump-back operation are two-track jumps, as shown in FIG. 4(e'), for example. back,
After that, after playing frame A, the operation of jumping back one track is repeated, and frame A is played back as a still image (fourth frame).
Figure (f')) - can also be done. Furthermore, as shown in FIG. 4(e), for example, after performing a two-track jump back and reproducing frames A and B, the two-track jump back operation is repeated again to reproduce frame A and frame B. It is also possible to repeatedly reproduce (Fig. 4 (M')). If the length of digital data is one block, the length of one block, which is the minimum unit, after interleaving is made shorter than one frame, and the last part is By placing S before the vertical synchronization signal of the jumpable position of the related frame, the squelch of the video signal can be canceled at the time when position S is searched, and the squelch time can be shortened. In this regard, it is possible to ensure compatibility with ordinary video discs that are already on the market.The above playback devices obtain still images by jumping back the reading pickup, but only one field or one frame of video memory can be obtained. [Effect 1] As described above, in the present invention, in a video disc in which a television video signal and a digital data signal are frequency-divided and multiplexed onto the same track, Divide the data signal into blocks consisting of predetermined bits,
Interleaving is performed so that the length of the block after interleaving is longer than one field of the television video signal and shorter than one frame, and the tail of the digital data signal is located in front of the position corresponding to the vertical synchronization signal. Since a series of screens and a series of block-structured digital data related thereto can be read out efficiently. 4. Brief description of the drawings FIG. 1 is a block diagram of the recording device of the present invention, FIG. 2 is a block diagram of the reproducing device, FIG. 3 is a more detailed block diagram of a part of the reproducing device, and FIG. 5 is a schematic plan view of a field of a television video signal, FIG. 6 is a spectrum diagram of an optical video disc, FIG. 7 is a spectrum diagram of an EFM signal, and FIG. Figure 8 is a spectrum diagram of an optical video disc recording EFM (No. 8), Figure 9 is a block diagram of a conventional optical digital audio disc recording device, and Figure 10 is a block diagram of its playback device. .4,5.11... Pre-emphasis circuit 2
．． 6.7...FM modulator 3...Adder 8...PCM encoder 9...EFM encoder 10...Low pass filter 12. ...Limiter 13...Light modulator 14...Laser light source 15.24...Objective lens 17...Record source a 22... ...Video disc 23...Pickup 25...
...Amplifier 26.29.30...Band pass filter 27, 31.32...FM demodulator 2
8.33.34...De-emphasis circuit 37
... EFM decoder 38 ... PCM decoder 41 ... Memory 42 ... Position detection means 51.53 ... Switch 52 ... ...Data decoder 54...What?Racking control circuit 61...
・Jump pulse generation circuit 73.75...RA
M Patent Applicant Pioneer Co., Ltd. Figure 4

Claims (3)

[Claims] (1) In a video disc in which a television video signal and a digital data signal are frequency-divided and multiplexed onto the same track, the digital data signal is divided into blocks each consisting of predetermined bits, and the length after interleaving is , interleaved so that the block is longer than one field and shorter than one frame of the television video signal, and the tail part of the block after interleaving is recorded near the position corresponding to the vertical synchronization signal of the television video signal. A video disc characterized by: (2) In a recording device that frequency-divides a television video signal and a digital data signal and multiplex-records them on the same track of a video disk, the television video signal is modulated and the digital data signal is made up of predetermined bits. divided into blocks, and interleaved so that the length after interleaving is longer than one field and shorter than one frame of the television video signal,
A vertical synchronization signal is detected from the television video signal, and the digital data is processed so that the end of the block after being modulated such as interleaving is located near the position corresponding to the detected vertical synchronization signal. 1. A recording device for arranging signals, adding the modulated signal of the television video signal, the digital data signal, etc., and recording the result on the video disc. (3) A television video signal and a digital data signal are frequency-divided and multiplexed onto the same track, and the digital data signal is divided into blocks each consisting of predetermined bits, and the length after interleaving is the same as that of the television video. The signal is interleaved so that it is longer than one field and shorter than one frame, and the tail part of the block after undergoing modulation such as interleaving is recorded near the position corresponding to the vertical synchronization signal of the television video signal. In the video disc playback device that is
The digital data signal and the modulation signal of the television video signal are separated from the reproduction signal of the video disc by a filter means, and the digital data signal is reproduced from the beginning to the end of the block, and the digital data is A predetermined position of the television video signal behind the tail of the block of signals is detected, the pickup is jumped back at the predetermined position, and the vertical synchronization signal near the position corresponding to the beginning of the block is detected. A playback device characterized in that it plays back a field or frame of the television video signal recorded later.