JPS58190177A - Video and sound recording method - Google Patents

Abstract

PURPOSE:To ensure good reproduction of both a picture and a sound signal when a still picture, etc. is reproduced, by providing a sound track in addition to a video track, and recording divided sound signals and a complementary signal at skipping on the sound track. CONSTITUTION:For a video disk, the distance between points A and B is designated to a video track. Then the control information that designates the states of reproduction of both video and sound signals is recorded in a vertical flyback time. The channels Sa and Sb are recorded for sound signals on the video track with multiplexing of frequencies. While the distance between points B and C is designated to a sound track. Then signals S2-Sn obtained by dividing a sound signal of an optional time length related to the video signal are recorded on the sound track together with a switch sound signal S1 which complements the signal equivalent to the skip time that is produced when the sound track is scanned repetitively with multiplexing of frequencies.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for recording video and audio signals on a video/audio recording medium such as a video disc that records audio signals together with video signals for still images.

Generally, video discs record video signals for moving pictures and continuous audio signals simultaneously using frequency division multiplexing, but when obtaining still images from this, the same track is repeatedly scanned, so still images cannot be obtained. However, the problem is that parts of the audio signal are repeatedly played back, making them incomprehensible.

As a countermeasure to this problem, ``recording media for reproducing still images and slow motion images that can also reproduce audio signals'' (Japanese Patent Application Laid-open No. 53
-148316), but according to this K, video signals and audio signals are alternately and repeatedly recorded on the same track every horizontal scanning period, and the information of the Eirin signal is recorded. This decrease in the amount of image data causes a serious drawback in that the quality of the reproduced image deteriorates.

The present invention has an object of eliminating such drawbacks of the conventional art, and provides an audio track for recording audio signals in addition to an audio track for recording video signals, and also provides a plurality of channels by multiplexing to this audio track. In addition, a switching audio signal is recorded in one of these channels to compensate for the skip time that occurs when the audio track is repeatedly scanned by a skip operation, and a video signal is recorded after dividing the audio signal into one other channel.・Provides an audio recording method.

The present invention will be described in detail below with reference to figures showing embodiments, but first, let us look at the recording medium.

FIG. 1 is a schematic diagram when the present invention is applied to a video disc having a spiral track. The area between point A and point B is a video track TKv, and a predetermined number of fields of video signals are sent between this track. is recorded, and by scanning this portion with a pickup, a video signal for a still image can be obtained.

Also, the area between point B and point 0 is the audio track TKs, and the i! 52 channels are provided, each of which can record a specific audio signal.

However, in parallel with each of the tracks TKv and TKg, there is provided a tracking track on which a β trunking signal is recorded in order to regulate the trunking operation of the pickup during reproduction.

Fig. 2 is a spectrum diagram showing the frequency distribution of the Eirin signal at the Eirin track TK ma-no-seki as the relationship between the frequency f and the occupation level L, where the video signal V is distributed on the low frequency side and the high On the range frequency side, a channel Sa for audio signals is provided by frequency multiplexing.

sb is provided, and any audio signal is recorded onto this.

FIG. 3 is a spectrum diagram similar to FIG. 2 showing each channel for audio signals in audio track TK6,
In addition to the audio signal channels S a + S b, a plurality of audio signal channels Sl to Sn are provided by frequency multiplexing in a portion corresponding to the occupied frequency band of the video signal (2).

Therefore, after scanning the video track TKv and storing it in memory, the pickup successively scans the audio track TK3, performs a skip operation at point 0, and performs scanning from point B again.

Then, if the scanning from point B to point 0 is repeated,
Each channel of audio track TKs 61~Sn+8m
+ 8 b can be reproduced repeatedly 9. From the reproduced signal, extract the audio signal of channel s1 in the first scan, extract the audio signal of channel S2 in the second scan, and so on. Next, a series of audio signals can be obtained by extracting the audio signals of channels 83 to Sn, 8a, and Sb and arranging them in a predetermined order.

However, since the reproduction of the audio signal is interrupted during the skip operation from point 0 to point B, it is necessary to compensate for the audio signal for the skip time required for the skip operation. Therefore, a supplementary audio signal is prepared according to each skip time during repeated scanning by means as described below.

Each audio signal channel 81 to S n r Sa +
A switching audio signal for compensation is recorded in one of the channels Sb, for example, channel S] according to each skip time, and a series of switching audio signals are recorded in each of the audio signal channels 81 to other channels in Sn, Sa, and Sb. is recorded as audio signals divided according to the number of times of repeated scanning, and these are reproduced by repeated scanning to obtain a predetermined l! jK arrangement, a complete series of audio signals is obtained. In other words, the switching audio signal is played back and stored during the first scan of the audio track without skipping, and then the audio signal of each audio signal channel is played back by repeatedly scanning the same audio track, and the switching audio signal stored at this time is If you read out the ``Skip'' and ``Skip'' and play it back, you will get a complete series of audio signals.

However, it is necessary to specify the number of repeated scans, and a channel number signal indicating this number is sent to the movie track TK in advance.
Record it somewhere in v. In the present invention, this is represented by a predetermined binary code, and is called a control signal together with the binary codes of other signals described later. By the way, if we look at the recording state of the Eirin signal V in chronological order, we can see that the vertical synchronizing signal is inserted into the vertical blanking period, and the above-mentioned control signal is pulse-coded into the vertical blanking period of the video track TKv. After this is extracted and decoded during playback, the number of repeated scans is determined according to the content of the channel number signal.

If the explanation of the screen is still insufficient with repeated scanning of only one audio track TKs, if multiple audio tracks TKs are used after the 0 point in Fig. 1, it can be used for any length of time as needed. A continuous audio signal is obtained.

It is assumed that during this time, the video signal stored in the memory is repeatedly read out and displayed on the CRT.

In addition, in reality, there is a playback mode signal that specifies the playback status of whether the video signal is played back as a still image or as a continuous video, a title number signal for cueing, and a video track T.
Video control signals such as a track number signal indicating the number of Kv, a repetition number signal specifying the number of repetitive scans, an interval signal indicating the track interval, a time signal indicating the playback time, etc., and the number of audio tracks TKs. an audio track number signal indicating the number of repetition scans to be performed, a repetition number signal indicating the number of repetition scans, and an audio control signal specifying the reproduction status such as the aforementioned channel number signal,
It is coded and inserted into the vertical retrace period of the video track TKv.

The timing signal for regulating the timing of the reproduction operation is inserted into a portion of the tracking track corresponding to the vertical retrace period at least once per revolution of the video disc.

Alternatively, the video track used for video playback, slow playback, and quick playback may be recorded on the same recording medium, and each playback mode may be switched on the playback device side depending on the content of the video control signal and the timing signal.

Here, if the audio tracks TKs are multiplexed using, for example, a carrier multiplexing method, and when the occupied frequency band of the Eirin signal is the channel pitch of the F1 carrier frequency, the audio tracks TKi K are expressed by the following equation. Number of channels N
A plurality of channels can be provided.

N≦[Month...(1) However, 0 indicates the number rounded down to the decimal point.

Also, if it is assumed that the audio signal corresponding to the video signal of Eirin track TKv is continuous for t seconds, and the nulland track is used as the audio track, then the number of tracks is b1 the number of channels of each track is N1 to Nb-1, the number of channels of the last track is nb1, the number of channels used for switching audio signals for each track is d1 to db, ) 1 of the rack
Assuming that the time required for the rotation is T, and that there are two channels Sa and Sb for the original audio signal of O-Sho as shown in FIG. 3, the following equation holds true.

t = (N++2-ds ten N2+2-dz+Φ...
・−−−−・+Nb−++=−dh−1+r+h−dh
)T= (N*+Nz+■kai--+Nb-t+nb)T
+2(b-1)T-(d++d2+...+db-
++db)T (2) However, in the final track, all channels that can be accommodated are not used, but only the necessary number nb is used.

put it here, Then, the following equation can be obtained from equation (2).

t = (N(b-1)+nb)T+2(b-1)T-
d(b-1)T-db@T...(4) To find b, proceed as follows.

Substituting equation (1) into this, the number of tracks used as audio tracks is (
6) Determined by 2.

(9) For the number of switching audio signals, when focusing on the first track, if the number of channels is Nl and the number of channels for switching audio signals is di, no skip operation is necessary for the first channel. , is expressed by the following equation.

K = Ni +2 dl 1 = Ni +1-di
...@-(7) Note that the skip time is set to S times the horizontal scanning period, and the switching audio signals are arranged on the channel for switching audio signals at time intervals that are U times the horizontal scanning period. For example, in an interlaced scanning television system with 525 scanning lines, the following relationship holds true.

However, a is the number of fields recorded on one track.

If we calculate dl from equation (8)... (9) Therefore, the number of channels di for the switching audio signal is (9)
It is as shown by the formula.

FIG. 4 is a block diagram of the recording system, in which the video control signal VC8, audio control signal SCS, standard signal SS, etc. are created individually, and the The signals are directly fed to the synthesis circuit SYN, where they are synthesized as an Eirin track signal.

However, the tracking track signal is composed of a tracking signal and a timing signal. One timing signal is inserted into at least one track, and this one timing track means the trajectory of the pickup obtained by one rotation of the disk. In addition, in the present invention, this timing signal is not necessarily provided once per track.
Although the number does not have to be 1, the following explanation will be based on the case of 1.

Note that the video signal VS is subjected to frequency band limitation, frequency conversion of a color signal subcarrier, etc. in a frequency conversion circuit F'RC, and is converted into a video signal for a video disc.

Further, the synthesis circuit 5YNK has a built-in frequency modulator, and uses a synthesis signal to frequency modulate a carrier wave of about 5 to 6 MHz and sends it out as an Eirin track signal.

On the other hand, the audio signal 5Sij: is given to the multiplexing circuit MPX, where it is divided into predetermined time lengths, temporarily stored, and then assigned to each channel multiplexed by, for example, a carrier multiplexing method, and further 1 A carrier wave of about 5 to 6 MHz is frequency-modulated by each of these channels and then sent out as an audio track signal.

The respective outputs of the synthesis circuit SYN and the multiplexing circuit MPX are applied to the switch circuit SWI, selected by a switching operation corresponding to the control signal C8+, and then sent as a track signal to the cutting machine DCM, whereby the outputs of the recording medium are Recording is done.

However, the switch circuit SWt selects the output of the synthesis circuit SYN while recording the video track TKv, and selects the output of the multiplexing circuit MPX while recording the audio track TKs. A video signal, each control signal, and two channels of audio signals are recorded, and multiplexed audio signals are recorded as a plurality of channels on the audio track.

On the other hand, the tracking signal TR and the timing signal TM are recorded by the cutting machine DCMK on separate and independent tracking tracks in parallel with the above-mentioned video and audio tracks.

This timing signal TM is a tracking track I.
/C is applied to the tracking signal TRK by the cutting machine DCMK in response to switching of the switch SW2 so as to be inserted corresponding to an arbitrary position in the vertical retrace period of the above-mentioned video line signal VS. Such a signal 8C2 for controlling the switching of SW2 is appropriately generated by a well-known circuit.

FIG. 5 is a block diagram of a playback system, which plays back signals recorded by a capacitive or optical reflective pickup PUK from a video disc VD on a turntable TT driven and rotated by a motor MK. The output of this, that is, the signal reproduced from the video or audio track and the signal reproduced from the tracking track, is subjected to processing such as amplification in the reproduction processing circuit PBP, and then
Output. The signal reproduced from the tracking track is extracted by the separation circuit 5EP3. On the other hand, the signal played from the video or audio track is sent to the demodulator DEM.
The video signal, audio signal, and each control signal are extracted from the demodulated output.

Each of these signals is applied to a separation circuit SEP1, and separated into an audio signal, a video signal, and each control signal by a time gate means, a branching means, and the like.

Note that the audio signal directly applied to the switch circuit SW3 is a demodulated audio signal channel 5atSb in FIG. 3, and the other demodulator is the separation circuit 5EP1.
included in.

In addition, each channel of the video signal in the video track TKv and the audio signal system in the audio track TKs is as follows.
The signal is applied to the separation circuit 8EP2, where the video signal reproduced first and the signals of each channel of the audio signal system reproduced later are further separated in the separation circuit 5EP2. Here, since the Eirin signal has a storage capacity of at least one field, it is given to the memory IJ MEM and is stored under the control of the control circuit MCT.

On the other hand, the signals of each channel of the audio signal system sent out from the separation circuit 5EP2 are given to the multiplex demodulation circuit MDM, where a demodulation channel is selected based on the control from the processing circuit PR81, and the signals are converted into a switched audio signal and a divided audio signal. It is demodulated into an audio signal. A switching audio signal for compensating for the skip period is applied to an array circuit ARC using a charge transfer control element or the like, where the switching signal and the divided audio signals input to the channel are combined and arranged in a regular order.

Still, the audio control signal separated in the separation circuit SEP is applied to the processing circuit PR8, and the video control signal similarly separated is applied to the processing circuit PR82. Also,
The timing signal separated by the separation circuit 5EP3 is applied to the reproduction control circuit PCT, and the tracking signal is applied to the rotation control circuit RCT and the reproduction control circuit PCT. The processing circuit PR8 decodes the code of the input voice control signal in order to carry out the above-mentioned control, and sends its output to the multiplex demodulation circuit M.
A signal to be applied to the DM and specifying a reproduction status such as skip is generated by decoding the code in the same manner, and is sent to the reproduction control circuit PCT. In addition, this processing circuit PR
8l similarly generates the above-mentioned switch control signal and supplies it to the switch circuit SW3.

Therefore, the multiplex demodulation circuit MDλ1 selects a demodulation channel based on a predetermined binary code included in the audio control signal, and the switch circuit S'A'3 selects a demodulation channel from the separation circuit 5EP.
While selecting the audio signal from the array circuit ARC and then selecting the audio signal from the array circuit ARC, the reproduction control (2) circuit PCT
Based on the timing signal and the signal specifying the playback situation that is given in advance, the playback control mechanism PBM is controlled to cause the pickup PU to perform a skip operation.

By decoding a predetermined binary code included in the video control signal, the processing circuit PR82 sends the memory control signal to the control circuit MCT, and the subject number signal and time signal to the video processing circuit VFR, respectively. Supplied.

The control circuit MCT controls the writing and display operations of the memory MEM, and the video processing circuit VFR converts the title number signal and time signal into character signals, and
It is added to the video signal read from M. Furthermore, when the tracking signal is given, the reproduction control circuit PCT
controls the playback control mechanism PBX to cause the pickup PU to perform a tracking operation, and also controls the one-rotation control circuit RCT.
controls the rotation status of motor M.

However, the Eirin processing circuit VPR is equipped with a frequency conversion function, converting the frequency of the color signal subcarrier to that of the standard television system, and then mixing the Eirin signal with a character signal added according to the time signal. Send to device MIX.

On the other hand, the output of the switch circuit SW2 is given to the audio modulator SMD, where the audio carrier wave of 4.5 MHz etc. is frequency modulated, and this audio modulated wave is sent to the mixer MI.
At X, it is mixed with the video signal from the video processing circuit R and sent to the modulator MOD as a composite video signal.

In the modulator MOD, the carrier wave of a specific television channel is modulated by the composite signal, thereby obtaining a broadcast signal of the specific television channel.

Since this broadcast signal is given to the receiver VRX, when the video signal of the video track TKv is displayed as an image by the receiver VRX, the audio signal channel SF3. Sb
and each audio signal of the audio track TKs is sent out as a series of audio corresponding to the image.

Therefore, the image is displayed without deterioration, and the audio corresponding to the image is continuously reproduced for a time corresponding to the number of audio tracks TKsO and the number of channels.

However, the multiplexing circuit MPX in FIG. 4 may be a time division multiplexing circuit using pulse modulation. In this case, the configuration of the multiplex demodulation circuit MDM shown in FIG. 5 may be changed accordingly. Further, the contents of the video control signal and the audio control signal, that is, the control signals for each part, may be determined as binary symbols according to various conditions, and the configuration shown in FIG. 5 may be changed according to the contents. .

In addition, in Fig. 5, a memory is provided on the input side of the multiplex demodulation circuit For example, the modulator MOD may be omitted,
If the audio track comes before the video track,
The present invention can be modified in various ways, such as by providing an audio memo on the input side of the switch circuit Fax.

As is clear from the above explanation, according to the present invention, images are recorded without deterioration of image quality, and an audio signal having an arbitrary length of time related to the video is recorded. A remarkable effect can be obtained in recording the sound of still images and repetitive images of moving images such as exploded photographs.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention; Fig. 1 is a schematic diagram showing tracks of a video disc, Fig. 2 is a diagram showing the frequency spectrum of a signal recorded on an audio track, and Fig. 3 is a diagram showing a signal recorded on an audio track. A diagram showing the frequency spectrum of
FIG. 4 is a block diagram of the recording system, and FIG. 5 is a block diagram of the reproduction system. TKv *--Video track, TKs...Audio track, v, vs@--e video signal, Sa, 8b
. S1~Snφ...Audio signal channel, SS...
Audio signal, VO2...Video control signal, SO8...
・Audio control signal, SYN... synthesis circuit, MPX-@
@-Multiplex circuit, 8w1* SW2 * 11 @ @
Switch circuit, 8EP1, sgpz...distribution separation circuit, ■y...multiple demodulation circuit, ARC...array circuit, MEM---memory, MIX...mixer, v
RX...number/receiver. Patent applicant: ShinNippon Electric Co., Ltd. agent Masaki Yamakawa (and 1 other person) ＃、￥、t"＋.□A government official """'
"-57,'''"t, 31" mark 1, i person who does

Claims (1)

[Claims] A video control signal that specifies the playback status of the video signal and an audio control signal that specifies the playback status of the audio signal are recorded in a video track on which the video signal is recorded so as to be inserted into the vertical retrace period of the video signal. At the same time, a signal obtained by dividing an audio signal of an arbitrary length related to the video signal and a switching audio signal that compensates for the signal for the skip time that occurs during repetitive scanning are multiplexed to create an audio track different from the video track. A video/audio recording method characterized by recording to.