JPH02149087A - Information signal recording disk and reproducing device therefor - Google Patents

Abstract

PURPOSE:To prevent the generation of an extremely uncomfortable hearing sound due to the generation of delay or the like in a sound signal of a specific channel by modulating the frequency of sound signals in 1st to 4th channels in synchronism with a video signal whose image is changed in each two-field period per rotation, adding the modulated signals to a signal corresponding to the video signal and recording the added signal. CONSTITUTION:A video synchronizing signal outputted from a reference signal generator 49 is respectively supplied to a VTR 2 for reproducing and outputting a video signal and PCM systems 7, 9 and the reproduced video signal is synchronized with the frames of PCM signals from the PCM systems 7, 9. The frequency values of prescribed carriers of respective sound signals in the 1st to 4th channels CH1 to CH4 are modulated in CH1 to CH4 FM blocks 11 to 14, a time axis is varied and an unnecessary signal component is removed, and the sound signals of the CH1 to CH4 are synchronized with each other in a horizontal scanning frequency (fH). The 1st to 4th FM signals fs1 to fs4 are added by an adder 48, the added signal is added to a superposed signal outputted from a video signal processing circuit 5, the added signal is added to tracking signals fp1, fp2 and an index signal fp3, and then the added signal is recorded in an information signal recording disk.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides an information signal recording disk on which a video signal and four channels of fame signals are multiplexed and recorded in synchronization with each other, and a method for reproducing this information signal recording disk. The present invention relates to an information signal recording disk reproducing device.

(Prior Art) There is no conventional information signal recording disk in which a video signal and four channels of audio signals are multiplexed and recorded in synchronization with each other.

FIGS. 8 and 9 are diagrams showing ItF spectra of recording signals recorded on conventional information signal recording disks.

As shown in Fig. 8, the optical information signal recording disk modulates and records the video signal in the video FM carrier wave area, and the 4-channel audio signal in the audio FM carrier wave area. Of these, two-channel analog audio signals are recorded in the C111 and CH2 signal portions, and two-channel digital audio signals are recorded in the EF)l signal portion.

When an optical information signal recording disk recorded in this way is played back, the video signal and audio signal can be played back at the same time.
Since the audio signals of the four channels cannot be reproduced in perfect synchronization, when they are synthesized, the audio signals of specific channels are delayed, resulting in extremely unpleasant audio.

In addition, as shown in FIG. 9, the capacitive information signal recording disk records the 2-channel audio signal at C11 of the audio FM carrier wave.
1. Frequency modulate the CH2 signal. And the previous audio F
The sum signal obtained by adding the MIII transmission wave and the video FM carrier wave frequency modulates the video FMI transmission wave, and the tracking signals are recorded as fpl and fp2, and the index signal is recorded as rp3.

When a capacitive information signal recording disk recorded in this manner is reproduced, a video signal and a two-channel audio signal can be simultaneously reproduced, but a video signal and a four-channel audio signal cannot be reproduced simultaneously.

(Problems to be Solved by the Invention) As mentioned above, in the conventional information signal recording disk, a video signal and four channels of audio signals are multiplexed and the audio signals of each channel cannot be reproduced in perfect synchronization. There is a problem in that a delay occurs in the audio signal of a specific channel, resulting in extremely unpleasant audio, and it is not possible to expand the sound field satisfactorily.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides the following (1) to
There is provided an information signal recording disk and its reproducing device configured as in (5).

(1) The audio signals of the first to fourth channels, which are independent of each other in synchronization with the video signal whose image changes every two field periods per revolution, are obtained by frequency modulating the first to fourth carrier waves. The first added signal is obtained by adding the first to fourth FM signals, and the second added signal obtained by adding the first added signal and the signal corresponding to the video signal is the fifth added signal. An information signal recording circle characterized by recording a recording signal obtained by adding a tracking signal and an index signal to a signal obtained by frequency modulating a carrier wave! ! (0 ■ Among the audio signals of the first to fourth channels, which are independent from each other in synchronization with the video signal whose image changes every two field periods per rotation, the audio signals of the first and second channels are the 11th channel. The first and second FM signals are obtained by frequency modulating the first and second carrier waves, and the audio signals of the third and fourth channels are stereo modulated by carrier wave suppression^)1-FM stereo modulation. The signal becomes a third FM signal obtained by frequency modulating the third carrier wave, and the third FM signal is obtained by frequency modulating the third carrier wave.
The audio signals of the first to fourth channels are transmitted to the first to third F channels.
This is the first added signal obtained by adding the M signals, and this first
1 by adding the added signal and the signal corresponding to the video signal.
9. An information signal recording disk characterized in that a recording signal obtained by adding a tracking signal and an index signal to a signal obtained by frequency modulating a fourth carrier wave with a second addition signal is recorded.

■ Of the audio signals of the first to fourth channels that are independent of each other in synchronization with the video signal whose image changes every two field periods per rotation, the audio signals of the first and second channels are the first and second audio signals. The first wave obtained by frequency modulating the carrier wave of
and a second FM signal, and the audio signals of the third and fourth channels are a fourth FM signal obtained by frequency modulating a subcarrier with the audio signal of the fourth channel, and the audio signal of the third channel. The mixed signal obtained by frequency modulating the third carrier wave becomes the third FM signal, and the mixed signal becomes the third FM signal obtained by frequency modulating the third carrier wave.
The audio signals of the first to fourth channels are transmitted to the first to third F channels.
This is the first added signal obtained by adding the M signals, and this first
A recording signal obtained by adding a tracking signal and an index signal to a signal obtained by frequency modulating a fifth carrier wave with a second sum signal obtained by adding the sum signal of and a signal corresponding to the video signal. An information signal recording disc characterized by recording.

(4) Among the audio signals of the first to fourth channels, which are independent from each other and synchronized with the video signal whose image changes every two field periods per rotation, the audio signals of the first and second channels are the first and second channels. The audio signals of the third and fourth channels are the first and second FM signals obtained by frequency modulating the second carrier wave, and the audio signals of the third and fourth channels are the third and second FM signals obtained by frequency modulating the third and fourth carrier waves. 4 FM signal, and the first added signal obtained by adding the first and second FM signals and the second added signal obtained by adding the signal corresponding to the 1) h video signal. Record a recording signal obtained by adding a tracking signal and an index signal to a signal obtained by adding the third and fourth audio FM signals to a fifth FM signal obtained by frequency modulating the fifth carrier wave. An information signal recording disc characterized by:

(9) By reproducing the information signal recording disk according to claims 1 to 4, an RF multiplied signal corresponding to the audio signals of the first and second channels and the audio signals of the third and fourth channels is reproduced. , and a video signal; and an audio signal!l!1 filling part that modulates the audio signals of the third and fourth channels from the RF multiplied signal supplied from the disc reproducing part to v!i. , a microphone for renaming audio; an audio signal from this microphone; an audio signal of the first and/or second channel; a B-angle signal of the third and/or fourth channel; Alternatively, the second channel audio signal and the audio signal of the third and/or fourth channel are selected and outputted, and if necessary, these audio signals and the audio signal from the microphone are output. An information signal recording disk reproducing apparatus, comprising: a mixing switching section for outputting an output; and an image display device for displaying a reproduced image according to the video signal supplied from the disk reproducing section.

(Embodiment) The present invention relates to an information signal recording disk on which a video signal and four channels of audio signals are multiplexed and recorded in synchronization with each other, and an information signal recording disk reproducing device (9) for reproducing this information signal recording disk.

First, a signal recording method on an information signal recording disk according to the present invention will be explained.

As this recording signal, for example, FIGS. 5(A) to (B)
As shown in the RF spectrum according to the FM-FM recording method shown in the figure, it consists of a video signal, audio signals of 4 channels (C111 to CI+4), two tracking signals, and an index signal, and each audio signal of CH2-CH2 is a video signal. are multiplexed and recorded together with the video signal.

Now, the signal recording method used here is (1) FM
- FM recording system (configuration shown in Figure 1, recording signal having the RF spectrum shown in Figure 5 (8)) ■ (Carrier suppression type H-FM) - FM recording system (configuration shown in Figure 2, recording signal having the RF spectrum shown in Figure 5 (8)) (3) (WA carrier wave FM-FM) - FM recording method (configuration shown in Figure 3, recording signal having the RF spectrum shown in Figure 5 (B)) (4) There are four types: (FM-FM) plus DCH recording method (configuration shown in FIG. 4, R "recording signal with spectrum" shown in FIG. 5(C)).

(1) FM-FM recording method The video signal to be recorded has a band of 3.1 MHz, for example.
Bandwidth ±500 with 2.56 MH subcarrier for luminance signal
This is a superimposed signal (a signal corresponding to a video signal) in which kHz chroma signals are superimposed in an interleaved manner, and the audio signals of C'H1 to C]14 to be recorded are, for example,
217.75fn (Cl1l), 237.25f open (C112).

256, 75 ('engineering (CHI3), 276.25f,
As shown in (CH4), the first to fourth FM signals fs+ to fs4 are obtained by frequency modulating the first to fourth carrier waves, and are obtained by adding these four FM signals fs1 to fs4. A fifth carrier wave of, for example, 6.7 MHz is frequency-modulated by a second sum signal obtained by adding the first sum signal and the superimposed signal.

After this, a tracking signal for tracking of a reproduction sensor (not shown) is added to the frequency-modulated second addition signal.
For example, 32.5f, 1(fp I), 45.5
h(fp2), index signal, e.g. 17.5f
The signal obtained by adding H(fp3) becomes the recording signal recorded on the information signal recording disk. Note that fll is the horizontal scanning frequency.

(tl12 transmission suppression^H-FM) -FM recording method The video signal to be recorded is a superimposed signal similar to the above method, and among the audio signals of C111 to C114 to be recorded, C11l , CH2 audio signal is similar to the above method, for example, 217.75fn (CHI),
The first and second carrier waves of 237°25fn (CH2) are frequency modulated.

The first and second FM signals fsfs2 are thus obtained. The audio signals of CH3 and C114 are carrier wave suppressed AM-
After being subjected to FM stereo modulation into one stereo modulated signal, this signal is used to generate a third carrier wave, for example, 256.
A third FM signal fs3 obtained by frequency modulating 75% is obtained. This stereo modulation converts left and right and R signals into Cl3. C
H4 audio signal, main channel is sum signal (L+R)
, the subcarrier (
For example, this is a modulation in which 3 fn ) are respectively amplitude-modulated signals.

Now, the first and second FM signals fs1. A first addition signal obtained by adding fs2 and third FM signal fs3 and a second addition signal obtained by adding the above superimposed signal,
For example, frequency modulating the fourth carrier wave of 6.7 MHz,
Two tracking signals fp1. The signal obtained by adding the index signal fp3 and the index signal fp3 becomes the recording signal recorded on the information signal recording disk.

Therefore, in this method, the recording frequency band of the audio signals from C old to C114 to be recorded can be reduced to three signals, so compared to the above method which has four signals, it has the advantage of reducing beats. It is advantageous.

(3) (Subcarrier FM-FM) - FM recording method The video signal to be recorded is a superimposed signal similar to the above method, and among the audio signals of CHI to C114, Cl-
The audio signal of 11, CH2 is the same as the previous method (1), for example, 217.75fn (Cl11), 237.25%.
The first and second carrier waves of (CHI2) are frequency modulated to obtain first and second FM signals fs, , fs2.

Then, the audio signal of C114 is, for example, 276.25
Fourth FM signal f obtained by frequency modulating the subcarrier of fn
s4, and the mixed signal mixed with the audio signal of this fourth FM multiplied signal C113 is, for example, the third FM signal fs obtained by frequency modulating the third carrier wave of 256.75%.
3, and the first to third FM signals fs1 to fs
A signal obtained by frequency modulating the fifth carrier wave with a second sum signal obtained by adding the first sum signal and the superimposed signal. ni, before (1
) method, two tracking signals fp1. fp2
, the index signal @[p3, and the signal obtained by adding them together becomes the recording signal recorded on the information signal recording disk.

Therefore, like the previous method (2), there are three audio signal carrier waves, which is advantageous in that four audio signal carrier bands are not required as in the previous method (1) and in terms of beat reduction.

(4) (FM-FM) Plus DCH recording method The video signal to be recorded is a superimposed signal similar to the above method, and among the audio signals of C old to C]14, CHI, C
As in the previous method (1), the HI2 audio signal is, for example, 21
7.75fn (CHI), 237.25fn (C1
The first and second carrier waves of fs1.12) are frequency modulated to produce first and second FM signals fs1. Obtain fs2.

The audio signals of CH3 and CH4 are, for example, 77,
The third and fourth carrier waves of 75 (C113) and 107.25 (CH4) are frequency modulated to obtain third and fourth FM multiplied signals s3°fsa.

Then, the first and second FM multiplied signals s1. a fifth FM multiplied signal obtained by frequency modulating the fifth carrier wave with a second sum signal obtained by adding the first sum signal obtained by adding fs2 and the above superimposed signal; 3rd and 4th FM times signal s
3. fs4 is added, and to the added signal, two tracking signals fp1. fp2
, index signal fl)3, and the resulting signal becomes a recording signal recorded on the information signal recording disk.

Next, a circuit configuration embodying the signal recording methods (1) to (4) described above will be described.

The basic circuit configuration is (1) the FM-FM recording method (the configuration shown in Figure 1), so this configuration will be explained first, and the recording methods in (1) to (4) will be explained below. Only the components that differ from this configuration will be described.

(1) FM - The circuit configuration of the FM recording method is shown in FIG. That is, the video synchronization signal output from the standard signal generator 49 is supplied to the VTR 2 and the PCH system 7.9 which reproduce and output the video signal, and the video signal to be reproduced and the PCH signal of the PGM system 7.9 are combined. frame synchronization. The synchronizer 50 connects the VTR 2 as a mask and the PCH system 7 as a slave.
9, and controls the output timing from the PCH system 7.9 so that the PCH signal of the PGM system 7.9 is output in synchronization with the output of the video signal.

The video signal outputted from the VTR 2 is supplied to the image quality improvement processing circuit 3 and subjected to image quality improvement processing, and then sent to one of the addition circuits 6 via the video signal processing circuit 5 in the modulation block 4, which will be described later. Applied to the input terminal. The video signal processing circuit 5 converts the supplied video signal into a superimposed signal (video signal) in which a luminance signal with a band of 3.1M is interleaved with a chroma signal of ±500 in the band using a subcarrier of 2.56MH. a signal corresponding to the signal).

Among the 4-channel recording audio signals of different types (signals for forming each audio signal CI+1 to C114) converted into PCM, one 2-channel audio signal is supplied to the PCH system 7, where it is The demodulated audio signal as an analog signal is supplied to the audio signal processing circuit 8.10 via the mixing circuit 100. At the same time, the PC
The other two channel audio signals converted into M are supplied to the PCH system 9, and the two channel audio signals demodulated here and made into analog signals are supplied to the audio signal processing circuit 8.10 via the mixing circuit 100. Ru. The mixing circuit 100 has analog signals from 0111 to CH4.
Each audio signal is added/subtracted and mixed in an appropriate amount as necessary.

CHI to C11 supplied to the audio signal processing circuits 8 and 10
Each audio signal of 4 is subjected to pre-processing such as frequency modulation, for example, pre-emphasis processing, in the modulation block 4, and then supplied to the CH1 to C114 FM blocks 11 to 14 in the modulation block 4.

In the 0111 to C114 FM blocks 11 to 14, each audio signal of the C111C114 is frequency-modulated on a predetermined carrier wave, and time axis fluctuations and unnecessary signal components of this frequency-modulated signal are removed, respectively, and the horizontal scanning frequency (fs) is
This synchronizes the audio signals of C111 to C114.

C1) Frequency modulation of a predetermined carrier wave with the audio signal of 1
The old FM block 11 includes a counter circuit 15゜17, a phase comparison circuit 16, a buffer circuit 18, for example, 400kl,
It is comprised of a frequency conversion wA (FM) circuit 19 for frequency modulating the audio signal of 0111 with a carrier wave of , a frequency conversion circuit 20, a bandpass filter 21, and an oscillation circuit 22.

Similarly, the C112 FM block 12, which frequency modulates a predetermined carrier wave with the audio signal of CH2, has a counter circuit 23.
．． 25, a phase comparison circuit 24, a buffer circuit 26, for example 400, an FM circuit 27 for frequency modulating the audio signal of CH2 with an electric carrier wave, a frequency conversion circuit 28, a band pass filter 29, an oscillation circuit 30; C113 FM that frequency modulates a predetermined carrier wave with the audio signal of
The block 13 includes a counter circuit 31, 33, a phase comparison circuit 32, a buffer circuit 34, for example, 400 kHz.
FM circuit 35, frequency conversion circuit 36, and bandpass filter 37 that frequency modulates the audio signal of 0113 using the carrier wave of
, an oscillation circuit 38, and frequency-modulates a predetermined carrier wave with the audio signal of CH4.
0, a buffer circuit 42, an FM circuit 43 that frequency modulates the C114 audio signal with a carrier wave of 400 kHz, for example;
Frequency difference signal ii'1J44, bandpass filter 45
, and an oscillation circuit 46.

Now, the operation of the Cl1l F14 block 11 will be explained. In addition, Cl1l FM block 11 is 0112
-C114 FM blocks 12-14, therefore, only the operation of the Cl1I FM block 11 will be explained, and the explanation of the operation of the 0112-C114 FM blocks 12-14 will be omitted.

As shown in FIG. 1, the frequency conversion circuit 20 receives an oscillation signal having a predetermined frequency supplied from an oscillation circuit 22, and
A frequency difference signal corresponding to the frequency difference with the FM doubler supplied from one FM circuit is supplied to the counter circuit 17. The counter circuit 17 divides the supplied frequency difference signal and supplies the obtained frequency-divided signal to one comparison input terminal of the phase comparison circuit 16 . This other comparison input terminal is connected to the counter circuit 1.
5 is supplied with the fs signal from the image quality improvement processing circuit 3 whose frequency has been divided by a predetermined frequency division ratio, and the phase comparator circuit 16 calculates the phase of both the divided signals supplied from each of the counter circuits 15 and 17. The phase comparison signal obtained from this is the FM
The signal is supplied to a circuit 19, where time-axis fluctuations of the carrier wave are removed. The FM circuit 19 is connected to the buffer circuit 18 through the buffer circuit 18.
An audio signal of 0111 from the audio signal processing circuit 8 is supplied. In the FM circuit 19, the fame signal of C111 is transmitted at a predetermined frequency (for example, 400K) 1. ), this FM signal is sent to the frequency conversion circuit 20.
The first FM signal fs1 corresponding to the audio signal of C]11 is output from here after unnecessary signal components are removed therefrom and sent to the adder circuit 48. Supplied.

Similarly, from the CH2-CH2FM blocks 12 to 14, 0112 to C1 frequency modulated with a predetermined carrier wave are transmitted.
2nd to 4th FM double fs corresponding to each of the 14 audio signals
2 to rs4 are output respectively, and all of these are added to the adder circuit 48.
is supplied to

In this way, the first to fourth FM signals fs, ~fS4 are added in the adder circuit 48 and then supplied to the other adder input terminal of the adder circuit 6, where the "-2 video signal processing circuit 5
After being added to the above-mentioned superimposed signal (signal corresponding to the video signal) from the above, this added signal is supplied to the FM circuit 47, where the added signal is frequency modulated and converted into a tracking signal [prp2, index signal (not shown)]. After being added to fl)z, a recording signal is generated to be recorded on an information signal recording disk (not shown).

Next, (2) (H-FM to carrier wave suppression) -The circuit configuration of the FM recording method is shown in FIG. Components that are the same as those described above are given the same reference numerals, and their explanations will be omitted.

Each audio signal of C113 and CH4 from the audio signal processing circuit 10 is sent to the stereo modulation block 10 in the modulation block 4.
1. (CH3, Cl+4) FM block 1
3 has the same configuration as the above-described C113FM block 13, and therefore is given the same reference numeral.

Stereo modulation block 101 is pre-emphasis circuit 1
02.103, matrix circuit 104, surface modulator 10
5, a mixer 106, and frequency dividers 107 and 108.

The audio signals C113 and C114 from the audio signal processing circuit 10 are supplied to pre-emphasis circuits 102 and 103, respectively, and after being pre-emphasized there, are supplied to the matrix circuit 104, where the sum signal (Cl+3 + 0114) and a difference signal (Cl+3-C114) are generated.

Sum signal (Cl+3+CH4) direct, mixed 'a10GM
Supply and difference (CH3-Cl+4) are balanced modulator 1
After being balanced modulated at step 05, it is supplied to mixer 10G. The frequency dividing circuit 107 is supplied with an fsc signal from a video signal processing circuit 109 that separates and outputs a carrier color signal subcarrier fsc and a frequency-modulated video signal from the video signal supplied from the image improvement circuit 3. After dividing this signal, it is supplied to a balanced modulator 105 and a frequency divider 108.

The signal supplied to frequency divider 108 is frequency-divided and then supplied to mixer 10G.

In this way, a stereo modulated signal is output from the mixer 10G. This stereo modulation signal is (C113, C1
14) The signal is fed to a buffer circuit 34 within the FM block 13, where this signal is fed to a carrier wave (e.g. 256, 75
fx) and outputs the FM signal fs3. This FM signal rs3 has a sum signal (L+R) on the main channel and a difference signal (L-R) on the sub channel, which is an rJI carrier (3fH). This is a signal obtained by frequency modulating a signal obtained by carrier wave suppression width modulation.

In this way, the first to third F)l signals fs1 to fs3 are all added in the adder circuit 48, and then supplied to the other addition input terminal of the adder circuit 6, where they are input from the video signal processing circuit 109. After being added to the superimposed signal (signal corresponding to the video signal), this added signal is supplied to the FM circuit 47, where the added signal is frequency modulated to produce a tracking signal fp1゜p2 (not shown), an index signal fD
3, a recording signal is generated to be recorded on an information signal recording disk (not shown).

Now, the circuit configuration of the (■ (subcarrier FM-FM) -FM recording system) is shown in FIG. 3. The same components as those described above are denoted by the same reference numerals, and the explanation thereof will be omitted.

The audio signals C113 and C)14 from the audio signal processing circuit 10 are transmitted to C113 and C114FM in the modulation block 4.
It is supplied to blocks 13^ and 14, respectively. C113rH
The block 13A has the same configuration as the CH3FM block 13 described above, but uses a mixing circuit 110 instead of the buffer circuit 34.

The audio signal of CH4 from the audio signal processing circuit 10 is
The audio signal of C114 is supplied to the 4FM block 14, and the fourth FM is obtained by frequency modulating a predetermined carrier wave.
This fourth FM double fs4 is supplied from the bandpass filter 45 to the mixing circuit 110, where the mixed signal mixed with the audio signal of C113 is frequency-modulated on a predetermined carrier wave and converted to 157. Third FM signal fs3
becomes.

In this way, the first to third FM doublers fs, ~rs3 are all added together in the adder circuit 48, and then supplied to the other adder input terminal of the adder circuit 6, where they are input from the video signal processing circuit 109. After being added to the superimposed signal (signal corresponding to the video signal), this added signal is supplied to the FM circuit 47,
Here, this addition signal is frequency modulated to produce a tracking signal fp+ (not shown).

After adding fp2 and index signal fD+, a recording signal is generated to be recorded on an information signal recording disk (not shown).

Furthermore, (4) (FM-FM) plus DC) l recording system is shown in FIG. Before)! Components that are the same as those shown above are given the same reference numerals and their explanations will be omitted.

Each audio signal of CHI to C114 from the audio signal processing circuits 8 and 10 is transmitted to CII to C114FM in the modulation block 4.
It is supplied to blocks 11-14.

Then, the first and second FM signals fs1. fs2 is added by the adder circuit 48 and then supplied to the other addition input terminal of the adder circuit 6, where it is added to the video signal processing circuit 109.
After being added to the @tatami signal (signal corresponding to the video signal) from , this added signal is supplied to the FM circuit 47, and the FM signal obtained by frequency modulating a predetermined carrier wave is sent to the adding circuit 111.
where the third and fourth FM doublers fs3. f
After being added to s4, the tracking signal fp (not shown)
l*rD2 and the index signal fp3 are added to generate a recording signal to be recorded on an information signal recording disk (not shown).

Next, a reproducing apparatus for reproducing the above-mentioned disc (information ID number recording disc) 1 will be explained.

Here, the four-channel audio signals recorded on the disc 1 are multiple-recorded audio signals created from the same analog sound source in synchronization with each other.

FIG. 6 is a block diagram showing an embodiment of the information signal recording disk reproducing apparatus according to the present invention, and FIG. 7 is a block diagram showing the audio signal processing unit 52 shown in FIG. 6 and its peripheral parts.

As shown in FIG. 6, the information signal recording disc reproducing bag @50 includes a disc reproducing section 51, an audio signal processing section 52, a switching section 54, an amplifying section 55, main speakers 56, 57, a monitor 59, a r crophone 60. A sound field expansion control circuit 61 and sub-speakers 62 and 63, which are connected to the U switching section 55 and produce a so-called surround effect, are added as necessary.

The playback device 50 configured as described above operates as follows.

When the disc 1 is played back by the disc playback section 51, a series of video signals and audio signals of Cl-11 and C112 are outputted. At the same time, the audio signal processing section 5
2 outputs audio signals of C113 and CH14.

All of the audio signals of 0111 to C1+4 are supplied to the mixing switching section 54, where they are controlled from the outside to 1) CH
l1 or C112 audio signal 2) CHl and C112
Audio signal 3 of C1+3 or C114 Audio signal 4 of CH3 and C114 Audio signal 5 of Cl or C112 and C113 or C11
Mixed signal (6) of the audio signal of 081 and C112 and the audio signal of C113 or C114 (7) Mixed signal of the audio signal of C1+1 or C1+2 and the audio signal of C113 and C114 (8) ) C1 (Audio signals of 1 and C112 and audio signals of C113 and CH4 (9) Subtraction signals of CH1 and CH2 and C113 and C
U white signal with the audio signal of 114 (10) Mixed signal of the subtracted signal of CHl1 and CHl2 and the audio signal of C113 or C114 (11) The subtracted signal of C113 and Cl14 and Cl and C
Mixed signal with the audio signal of 112 (12) Select and output any one of (1) to (12) of the mixed signal of the subtracted signal of CHl3 and C114 with the audio signal of C111 or C112, and output as necessary. After these audio signals and the audio signal from the microphone 60 are mixed, two mixed switching signals 81 and 82 are output.

This mixed switching signal Ml, 82 is supplied to the amplifier section 55 and the sound field expansion control circuit 61.

The mixed switching signals 82 supplied to the amplifying section 55 are amplified here and then supplied to the main speakers 56 and 57, respectively. Further, the mixed switching signals H1 and 82 supplied to the sound field expansion control circuit 61 are supplied to the sub-speakers 62 and 63, respectively, after being subjected to a predetermined process for expanding the sound field.

In this way, main speaker 56.57, sub speaker 6
Since the reproduced sound can be output from 2.63 at the same time, it is possible to expand the sound field in the - layer.

At the same time as this fame reproduction, the video signal reproduced from the disc reproduction section 52 is supplied to five monitors, where the moving image is reproduced.

In this way, by playing back the above-described disc 1 with the playback device 50, it is possible to play back a large number of sounds in a desired state as well as playing back a playback image.

FIG. 7 is a block diagram showing the audio signal processing unit 52 and its peripheral parts.

In the figure, the audio signal processing section 52 includes R'buffer circuit 70, C113, CI+4 signal demodulation circuit 71.7.
2. Consists of amplifiers 73 and 74.

The mixing switching unit 54 is an amplifier 75.76.77.85.8
6. Mixing switching circuit 78, 87, 90, volume 80, balance adjustment volume 79.81, addition/subtraction circuit 83, 84
, 88.89, addition circuits 91.92, mixing switching circuit 78°87.90, and volume 80. The balance adjustment volume 79, 81 is interlocked by a control signal supplied from the outside. The amplification section 55 is an amplifier 93.94
It consists of

Now, the R signal supplied from the disc playback section 51 is
It is applied to the C113 and C114 signal demodulation circuits 71 and 72 via the F buffer circuit 70, where the CH3 and C1+
The signal is demodulated into 4 audio signals. The audio signals of C113 and CH4 are amplified by amplifiers 73 and 74, and then supplied to mixing switching circuits 87, respectively.

At the same time, the disc playback unit 51 outputs CH11°CH.
The two audio signals are supplied to amplifiers 75 and 76, where they are amplified and then applied to the mixing switching circuit 78. The mixing switching circuit 78 switches between C and C according to a control signal supplied from the outside.
111 to the addition/subtraction circuit 83, and C112 to the addition/subtraction circuit 84.
Then, a mixed signal of C111 and CH2 (a signal obtained by addition and subtraction) is output to the balance adjustment volume 81. The mixing switching circuit 87 selects C1 according to a control signal supplied from the outside.
13 to the addition/subtraction circuit 88, C114 to the addition/subtraction circuit 89, and a mixed signal of CH13 and 0114 (signal obtained by addition/subtraction) to seven balance adjustment volumes.

In addition, after the audio signal from the microphone 60 is amplified by an amplifier 77, the signal level is adjusted by a volume 80, and the sound field localization balance is adjusted by a balance adjustment volume 82.

In this way, each signal supplied to the balance adjustment volume 79, 81 is adjusted to the control signal supplied from the outside and the addition/subtraction circuits 83, 84, 88
．． 89, each frame is added or subtracted by an external control signal.

The respective signals of the adder/subtractor circuits 83, 84, 88, and 89 are supplied to a mixing switching circuit 90, and the selected mixing signal 83. Output as the old mixed signal. That is, (1) CHl1 or CHl2 audio signal (2) C1
11 and C112 audio signal (3) CH3 or C11
4 audio signal (4) CH3 and C114 audio signal,
(5) Mixed signal of Ctll or C112 audio signal and 0113 or C114 fame signal (6) C old and CH2 audio signal and C113 or C11
Mixed signal with audio signal of 0113 and CHl4 (7) Mixed signal of audio signal of CHl1 or CH2 with audio signal of C113 and C114 (8) Audio signal of CHl and C112 and audio signal of 0113 and CHl4 (9) CHl and C ] Mixed signal of subtracted signal of 12 and audio signal of C1+3 and C; 14 (10) CHl and C [mixed signal of subtracted signal of 12 and audio signal of C113 or C114 (11) Subtracted signal of C113 and C114 Mixed signal with audio signals of C111 and C112 (12) Subtraction signal of CH3 and CH4 and C111 or C
] Selects and outputs any one of (1) to (12) of the mixed signals with the 12 audio signals, and mixes these audio signals and the audio signal from the microphone 60 as necessary. Two mixing switching signals 81 and 82 are output.

Mixed switching signal 81. output from adder circuit 91.92.
82 is the amplification section 55 and the sound field expansion ill tI11 circuit 6
1.

(Effects of the Invention) As described above, in the information signal recording disk and the information signal recording disk reproducing apparatus 1 according to the present invention, a video signal and audio signals of 4 desennels are multiplex recorded, and the audio signals of each channel are Since it can be played in complete synchronization, it is possible to prevent delays in the audio signals of specific chitunnels, which would result in extremely unpleasant sounds, and has the effect of expanding the sound field with extremely high quality. .

[Brief explanation of the drawing]

Figures 1 to 4 are circuit configuration diagrams used in a signal recording method for generating recording signals recorded on an information signal recording disk according to the present invention, and Figures 5 (^) to (B) are according to the present invention. A diagram showing the RF spectrum of a recording signal recorded on an information signal recording disk, FIG. 6 is a block diagram showing an embodiment of the information signal recording disk reproducing apparatus according to the present invention, and FIG. 7 is shown in FIG. FIGS. 8 and 9 are block diagrams showing the audio signal processing unit 52 and its peripheral parts, and are diagrams showing the R spectrum of a recording signal recorded on a conventional information signal recording disk. 1... Disc (information signal recording disc), 50... Information signal recording disc reproducing device, 51... Disc reproducing unit,
52... Fame signal processing section, 54... Mixing switching section, 5
5... Amplification section, 56.57... Main speaker, 5
9...Monitor, 60...Microphone, 0111-CI+4...Audio signals of the first to fourth channels. Patent Applicant Kakimoto, Representative of Victor Japan Co., Ltd.
Kunio and 1 other person Figure (C) Figure Figure Figure Figure

Claims (5)

[Claims] (1) The audio signals of the first to fourth channels, which are independent of each other in synchronization with the video signal whose image changes every two field periods per revolution, are obtained by frequency modulating the first to fourth carrier waves. The first added signal is obtained by adding the first to fourth FM signals, and the second added signal obtained by adding the first added signal and the signal corresponding to the video signal is the fifth added signal. An information signal recording disk characterized in that a recording signal obtained by adding a tracking signal and an index signal to a signal obtained by frequency modulating a carrier wave is recorded. (2) Among the audio signals of the first to fourth channels, which are independent from each other and synchronized with the video signal whose image changes every two field periods per rotation, the audio signals of the first and second channels are the first and second channels. First and second FM signals obtained by frequency modulating the second carrier wave are obtained, and the audio signals of the third and fourth channels are converted into a third stereo modulated signal obtained by performing carrier suppression AM-FM stereo modulation. The audio signals of the first to fourth channels become the third FM signals obtained by frequency modulating the carrier waves of the first to third FM signals.
A first added signal is obtained by adding the signals, and a fourth carrier wave is frequency modulated with a second added signal obtained by adding the first added signal and a signal corresponding to the video signal. An information signal recording disk characterized in that a recording signal obtained by adding a tracking signal and an index signal to the obtained signal is recorded. (3) Among the audio signals of the first to fourth channels, which are mutually independent and synchronized with the video signal whose image changes every two field periods per rotation, the audio signals of the first and second channels are the first and second channels. The audio signals of the third and fourth channels are the first and second FM signals obtained by frequency modulating the second carrier wave, and the audio signals of the third and fourth channels are the FM signals obtained by frequency modulating the subcarrier wave with the audio signal of the fourth channel. A mixed signal obtained by mixing the FM signal of No. 4 and the audio signal of the third channel becomes the third FM signal obtained by frequency modulating the third carrier wave, and the audio signal of the first to fourth channels becomes the third FM signal obtained by frequency modulating the third carrier wave. The first added signal is obtained by adding the first to third FM signals, and the second added signal obtained by adding the first added signal and the signal corresponding to the video signal is the fifth added signal. An information signal recording disk characterized in that a recording signal obtained by adding a tracking signal and an index signal to a signal obtained by frequency modulating a carrier wave is recorded. (4) Among the audio signals of the first to fourth channels, which are independent from each other and synchronized with the video signal whose image changes every two field periods per rotation, the audio signals of the first and second channels are the first and second channels. The audio signals of the third and fourth channels are the first and second FM signals obtained by frequency modulating the second carrier wave, and the audio signals of the third and fourth channels are the third and second FM signals obtained by frequency modulating the third and fourth carrier waves. 4 FM signal, and the second added signal obtained by adding the first added signal obtained by adding the first and second FM signals and the signal corresponding to the video signal, and the fifth added signal. A recording signal obtained by adding a tracking signal and an index signal to a signal obtained by adding the third and fourth audio FM signals to a fifth FM signal obtained by frequency modulating a carrier wave is recorded. Characteristic information signal recording disk. (5) By reproducing the information signal recording disk according to claims 1 to 4, an RF signal corresponding to the audio signals of the first and second channels and the audio signals of the third and fourth channels is generated. and a video signal; an audio signal processing unit that demodulates the third and fourth channel audio signals from the RF signal supplied from the disc reproduction unit; and a microphone that collects audio. and an audio signal from this microphone, an audio signal of the first and/or second channel, an audio signal of the third and/or fourth channel, and an audio signal of the first and/or second channel. and a mixing switching unit that selects and outputs an audio signal from among the audio signals of the third and/or fourth channel, and outputs these audio signals and the audio signal from the microphone as necessary; An information signal recording disk reproducing apparatus comprising: an image display device that displays a reproduced image according to the video signal supplied from the disk reproducing section.