JPS62214558A - Video disk and its recording and reproducing device - Google Patents

Abstract

PURPOSE:To easily retrieve and reproduce specified pictures or data by regulating the length after interleaving and the position of end part of a block and recording directly for each corresponding frame. CONSTITUTION:Digital data signals are inputted to an ETM encoder 9 through a memory 41 and the memory 41 is controlled by a means 42 that detects specified position of video signals. By such constitution, the digital data signals are divided into blocks and interleaved to make the length after interleaving specified length, and the end part of the block is recorded near a specified position. Further, recording is made directly for each corresponding frame of field. Thus, digital data of related block structure can be made correspondent to each frame or each field, and retrieving or reproducing of specified pictures or digital data can be made easily.

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 sync chip level of a television video signal is 7.6MHz.

By frequency modulating the carrier wave so that the white level becomes 9.3M1-1z, the accompanying audio signals such as left and right stereo signals and bilingual signals can be changed to 2.
The data are recorded by frequency modulating carrier waves of 3 MHz and 2.8 MHz, respectively. On the other hand, as shown in FIG. 7, the spectrum of the EFM signal of the PCM-converted left and right stereo audio signals on an optical digital audio disc occupies a band of approximately 2 M l-1z or less.

As mentioned above, in a video disc, the band below 2 MHz is almost empty, so 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 a pre-emphasis circuit 1 is frequency-modulated by an FM modulator 2 and input to an adder 3.

Furthermore, the audio signals of the two channels are subjected to pre-assistance by a pre-emphasis circuit 4.5 and then to an FM modulator 6.
．． 7 and is input to the adder 3. Furthermore, the audio signals of the two channels are converted into digital (PCM) by a PCM encoder 8, EFM-modulated by an EFM encoder 9, unnecessary high-frequency components are removed by a low-pass filter 10, and then added via a pre-emphasis circuit 11. It is input to device 3. Therefore, in the adder 3, the 1:M 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 from the laser light source 14 is modulated in accordance with the signal, and is irradiated via the objective lens 15 onto the recording original plate 17 rotated by the motor 16, thereby recording the signal. Since the technique for forming a disk from such a recording original plate 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. The disk 22 rotated by the motor 21 is irradiated with a laser beam emitted from the pickup 23 via the objective lens 24, and the reflected light is directed to the pickup 2 via the objective lens 24.
3, and a reproduction signal is output. The reproduced RF signal is output 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. Pre-emphasis circuit 1 for the isthmus image signal, FM modulator 2, adder 3. Pre-emphasis circuit 4, 5 for the audio signal of two channels, FM
Modulators 6, 7, low-pass filter 10 in the signal path of EFM encoder 9, pre-emphasis circuit 11, adder 3
A limiter 12 and an optical modulator 1 placed in the signal path from
3. The construction of the laser light source 14, objective lens 15, motor 16, recording original plate 17, etc. is the same as that shown in FIG.

[Function of disk and recording device] The function will now be explained. The video signal and the two channels of audio signals are sent to the pre-emphasis circuit 1.4.5. F
The frequency modulation is performed by the M modulators 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, the odd field (A1.81.C1, Di, El
, Fl) followed by an even field (A2.B2.C
2,02°E2. F2) makes up one screen, so 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, el
, C2) and a portion where the same screen is recorded for three consecutive fields (bl, b2.b3.dl, d
2, d 3. r1. f2. r3),! : There is,
The positions you can jump to for still image playback are No. 2.
This is the position where the screen before the ruby and one field before are the same (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 position of the jumpable synchronization signal 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 S, the digital data signal 41 outputs the digital data signal that has been stored up to that time. This digital data signal is supplied to an EFM encoder 9, subjected to processing such as interleaving, and inputted to an adder 3 via a low-pass filter 10 and a pre-emphasis circuit 11, where it is frequency modulated.

Added to image signal and audio signal. As a result, the tail of the digital data signal is arranged and recorded near the position corresponding to the position S of the video signal.

By the way, the length of one block of digital data signal is
1 can be set to any value such as 1 to 2 kilobytes, but it is suitable for optical digital audio discs, for example. Block length of audio signal before EFM modulation (98 frames (1 frame is 24 bytes))
2°352V Robite (= 24 x 9
8), that is, if one block is a digital data signal of 18°816 kilobits, and its length before interleaving is, for example, approximately 13.3 ms, then the dispersion due to interleaving of the EFM encoder of an optical digital audio disc is approximately 14.3 ms. Since the length is 7ms, the length of one block after interleaving is approximately 28m5.
becomes. Since the vertical synchronization signal interval (length of one field) is approximately 16.7fflS, one block of ink-
The length before leaving is! l! It is shorter than the interval between direct signals (length of 1 field), but the length after interleaving is 1
It is longer than the length of a field and shorter than the length of one frame. Therefore, for example, two blocks of digital data signals Da1 . When Daz, Dtz, and C1b2 are made to correspond to each other discretely for each frame (Fig. 4 (C
)) is the block D'a2 after R after interleaving,
l) The tail of 'b2, D'c2, etc. is the iI of each frame.
It is recorded near the position corresponding to the post-I vertical synchronization signal (FIG. 4(f)) (FIG. 4(e)). Furthermore, when each block is made to correspond discretely to each field (FIG. 4(b)), each block D' after interleaving is
a 1, D' a 2, D' b+ , D' b2, D
The trailing part, such as 'c+, is recorded near the position corresponding to the vertical synchronization signal immediately after each field (FIG. 4(b)).

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 spread, and in each frame after interleaving, the beginning part of the previous block D'a+, D'tz, etc. is the second block signal of the previous frame, which does not necessarily correspond in content. The position corresponds to the inside of the field (FIGS. 4(d) and (e)).

[Means for Solving the Problems - Reproducing Apparatus 1 FIG. 2 shows a block diagram of the reproducing apparatus.
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 to the data decoder 52 or PCM decoder 3B
is being supplied to. The switch 51 switches EF in response to a command from a microcomputer, etc. (not shown).
When an audio signal is recorded as an M signal, the M signal is switched to the PCM decoder 38 side, and when a digital data signal is recorded, it is switched to the data decoder 52 side. 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 dragging control circuit, which includes an equalizer 55 to which the tracking error signal output from the amplifier 25 is input, and a loop switch 5 of the tracking servo loop.
6, an adder E+557, and a drive amplifier 58 that drives a tracking actuator (not shown). 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 of the reproducing device] The operation when the EFM signal is not a digital data signal is the same as that described above, so the explanation will be omitted, and only the case where it is a digital data signal will be explained. For example, when a search command for room A or digital data D'al, D'a2 is issued from the microcomputer, the loop switch 56 is turned on, and the search operation for frame A or digital data e'a1, D'a2 is activated. At the same time, the squelch control circuit 62 turns on the switch 53 to squelch the video signal. When frame A or digital data D' a 1 , D' a2 is retrieved, loop switch 56 is closed, tracking control device 54 is activated, and normal playback operation begins. The EFM signal of the reproduced signal from the 7-channel amplifier 25 is input to an EFM decoder 37 via a low-pass filter 35 and a de-emphasis circuit 36, where it is EFM-demodulated.

The EFM demodulated signal is input to the data decoder 52 via the switch 51, stored in a predetermined memory in response to a signal from the memory control circuit 63, and processed. On the other hand, when the storage operation of the main block D'a2 of digital data is completed, a jump command is issued to the jump pulse generation circuit 61 (FIG. 4(1), (j)). Then, the jump pulse generation circuit 61 outputs a jump pulse to the adder 57 at the next timing when the vertical synchronization signal is detected by the vertical synchronization separation circuit 60 (of course, the jump pulse generation circuit 61 outputs a jump pulse to the adder 57 in the next block Da 2
If the jump pulse is generated immediately after reading ', there is no need to hold it until the next vertical synchronization signal is detected). Therefore, the tracking actuator is driven, and the pickup 23 moves from the vicinity of the vertical synchronization signal between the second field A2 of frame A and the first field B1 of frame B to the vicinity of the vertical synchronization signal immediately before the first field A1 of frame A. 1 track (frame) jump pack. Thereafter, the operation of reproducing frame A and then jumping back by one track is repeated, and frame A is reproduced as a still image (FIG. 4(g)). On the other hand, when the squelch control circuit 62 first reaches a position near the vertical synchronization signal immediately before frame A, it closes the switch 53 and cancels the squelch. Therefore, the user only sees the still image of frame A (FIG. 4(h)). 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 (No. 8) is waveform-shaped by the waveform shaping circuit A1, demodulated by the EFM demodulator 72,
For example, it is temporarily stored in a 16 kilobit RAM 73, and after processing such as deinterleaving, it is stored in an error detection and correction circuit 74.
Errors are detected and corrected. 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 capacity of the RAM 75 is set to two blocks of approximately 38 kilobits, it is possible to import digital data for one image at a time, but it is also possible to set the capacity to one block of approximately 19 kilobits. In this case, the length of the series of digital data recorded on the disk exceeds the capacity that the RAM 75 can store at one time (of course, it is also possible that it does not exceed the capacity)
, from the vicinity of the vertical synchronization signal immediately before the first block D'a1 to the vicinity of the vertical synchronization signal immediately after the subsequent block D'a2, and from the vicinity of the vertical synchronization signal immediately after the subsequent block D'a2. The jump back operation is repeated to the vicinity of the vertical synchronization signal immediately before the first block D'a1 (regardless of its path), and after the processing of the once stored digital data is completed, the next block is sequentially stored and processed. It is also possible to do so. During this time, the field or frame to be squelched in the video output can be selected arbitrarily6. For example, it is also possible to record the same image in frames A, B, etc. and always play it back as a still image during the jump repetition operation. be. In addition, the start and end points for repeating the playback operation and the jumpback operation are, for example, two points near the vertical synchronization signal immediately before frame B and one near the vertical synchronization signal immediately after frame B, as shown in FIG. 4(g'). You can also track jump back.

In this case, after reading blocks D'a1 to D'b2, frames A and B are repeatedly reproduced. In either case, the search target may be S or S'.

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. Furthermore, regarding the jump position, compatibility with ordinary video discs that are already on the market can be ensured.

[Effects] As described above, in the present invention, a digital data signal is divided into blocks each consisting of predetermined bits, and the digital data signal is interleaved so that the length after interleaving is longer than one field of a television video signal and shorter than one frame. , at least one block corresponds to one frame or field of the television video signal, and is recorded so that the end of the block after interleaving is located near the position corresponding to the vertical synchronization signal of the television video signal, and Since each corresponding frame or node is recorded discretely, it is possible to associate the related block-structured digital data with each frame or field, making it easy to search and reproduce a given screen or digital data. becomes.

[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 schematic plan view of a field of a television video 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 13. ...Light modulator 14 ...Laser light source 15.24 ...Objective lens 17 ... Recording plate 22 ...Video disk 23 ... ...Pickup 25...
... Amplifier 26.29.30 ... Bandpass filter 27.31.32 ... FM demodulator 28.33.34 ... De-emphasis circuit 3
7...EFM decoder 38...PCM decoder 41...Memory 42...Position detection means 51.53...Switch 52 ...Data decoder 54...1-racking control circuit 61...
...Jump pulse generation circuit 73.75...R
AM Patent Application Person Pioneer Co., Ltd. Route 4 Figure 6 m wave 1k (MHz) Figure 7 Eyebrow 1u (MHz) □ Procedural amendment (Jiju 1. Indication of incident 1985 patent application No. 56462 No. 2, Title of Defense Video Disc and its Recording and Reproducing Device 3, Relationship with the Amendment Case Patent Applicant 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 are interleaved so that the blocks are longer than one field and shorter than one frame of the television video signal, at least one of the blocks corresponds to one frame or field of the television video signal, and the end of the block after interleaving is A video disc characterized in that the vertical synchronization signal of the television video signal is recorded in the vicinity of a corresponding position, and is recorded discretely for each corresponding frame or field. (2) In a video disc recording device that frequency-divides a television video signal and a digital data signal and multiplexes them onto the same track, the television video signal is modulated and the digital data video signal is and interleave so that the length after interleaving is longer than one field of the television video signal and shorter than one frame, and at least one of the blocks is divided into blocks of one frame of the television video signal. Alternatively, the vertical synchronization signal at the end of the frame or field to which the block corresponds is detected, and the end of the block after interleaving is in the vicinity of the position corresponding to the detected vertical synchronization signal. The digital data signal is modulated so that the digital data signal is located at A recording device characterized in that it adds information and records it on the video disc. (3) 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 equal to that of the television. The blocks are interleaved to be longer than one field and shorter than one frame of the television video signal, and one block corresponds discretely to one frame or field of the television video signal, and the blocks after interleaving are In a playback device for a video disc recorded in such a way that the end of the frame or field is located near the position corresponding to the vertical synchronization signal at the end of the corresponding frame or field, the playback signal of the video disc is filtered from the playback signal of the video disc. The modulation signal of the television video signal and the modulation signal of the digital data signal are separated, the digital data signal is reproduced, and the position corresponding to the end of the block of the digital data signal is extracted from the television video signal. The operation of detecting the vertical synchronization signal recorded nearby and the operation of detecting a predetermined position after the end of the block are repeated to reproduce the video signal of the frame or field to which the block corresponds. Characteristic playback device.