JPS6222273A - Information signal recording disc - Google Patents

Abstract

PURPOSE:To prevent generation of abnormal operation by recording a previous notice signal prior to a recording position switching an analog and a digital recording track to reproduce and identify the previous notice signal thereby quick and easy changeover of a signal processing circuit. CONSTITUTION:After a signal from a digital recording VTR track or an analog recording VTR-8 track is demodulated/reproduced, a reproduced address signal is fed to a microcomputer 18 through an exclusive address data fetch circuit respectively. The computer 18 detects a value of low-order 2 bits of the inputted reproduced address signal and when it is 00, a notice signal judges the state to apply preparation of changeover a reproduction circuits 13, 17. Thus, the changeover 14 of the reproducing signal processing circuits 13, 17 is performed quickly to prevent the abnormity generated attended with the delay in the circuit changeover.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an information signal recording disk, and more particularly to an information signal recording disk in which analog recording tracks and digital recording tracks are mixedly recorded.

2. Description of the Related Art Conventionally, analog information signals such as composite video signals and audio signals are subjected to frequency modulation (FM) and recorded on concentric or spiral tracks as, for example, changes in geometric shapes. (referred to as a "disk"). This disc is called a video disc because the recorded information is mainly a composite video signal, and the recording track is a modulated signal obtained by performing analog modulation (particularly frequency modulation), which modulates a carrier wave with an analog information signal. Composite video signals and the like are recorded in the form of wave signals. Note that on a video disc, for example, an address signal for random access is recorded during a specific period within the vertical blanking period of a composite video signal, and the address signal is a coded digital signal. Since the main body of information is an analog-modulated composite video signal, etc., a track such as the recording track of a video disc will hereinafter be referred to as an "analog recording track" for convenience.

On the other hand, discs in which an audio signal or an audio signal and a video signal are each digitally modulated and then synthesized in a time-series manner and recorded on concentric or spiral tracks as, for example, changes in geometric shape, have also been conventionally used. widely known. This disc is called a digital audio disc because the recorded information is mainly an audio signal, and the video signal is mainly a still image and serves only as auxiliary information to help the imagination of the listener of the audio signal. ing. On the recording track of this digital audio disc, information signals such as audio signals and still image single character data are digitally modulated (particularly pulse code modulated), converted into a digital signal form, and then frequency modulated and recorded. There is.

In this specification, a track such as the recording track of this digital audio disc will be hereinafter referred to as a "digital recording track" for convenience.

By the way, compared to video discs, the recorded signals on the above-mentioned digital audio discs are digital signals, and due to the characteristics of digital signal transmission, audio signals can be reproduced with extremely high fidelity over a wide dynamic range, and still images can also be reproduced with extremely high clarity. Moreover, as a matter of course, there is an advantage that the audio signal is reproduced in ultra-high fidelity together with the still image reproduction image. On the other hand, when playing still images, video discs generally mute the audio signal in order to repeatedly play the same track, and unlike digital audio discs, still images and sound cannot be played at the same time. , since it is an analog signal transmission,
For example, compared to the 3,000 still images of a digital audio disc, it is possible to obtain 54,000 still images, and it is also possible to transmit information signals in a band of several MHz in real time, improving the accuracy of information. Compared to digital audio discs, which transmit information signals in a band of about several tens of kHz to increase the performance, this has the advantage that moving images can be played back together with audio signals. Therefore, in order to optimally reproduce recorded information,
It is desirable to select and record either a digital signal or an analog signal depending on the information content.

In particular, disks have attracted attention as image files for various purposes such as entertainment, education, and sales promotion because of their storage capacity of many meters of information and the ease and speed of retrieval thereof, and are widely used in sales promotion systems.

In order to establish an attractive system that meets diversifying demands for performance and capabilities, a variety of combinations of moving images, still images, audio, data, etc. are required as software.

By the way, as proposed by the present applicant, the above-mentioned video disc is capable of reproducing recorded signals by detecting changes in the electrostatic capacitance formed between the electrode of a scanning needle called a sensor and the disc. Tracking control reference signals of different frequencies are recorded on both sides of the information signal recording track (analog recording 1 to rack), and tracking control is performed by comparing the reference signal levels during playback. A video disc that does not require a guide groove is known. On the other hand, in the above-mentioned digital audio disk, the tracking control reference signal is connected to the information signal recording track (digital recording track ) It is known that there is a capacitance change readable digital audio disc without a needle guide groove, which is recorded on both sides of the disc. This digital audio disc is rotated at the same number of rotations as the above-mentioned capacitance change reading type video disc, the frequency of the reference signal for tracking control and the method of reproduction are the same, and furthermore, the frequency of the reference signal for tracking control and the method of reproduction are the same. They are also similar in that they have a structure in which a recorded signal can be read by detecting a change. Therefore, even when this digital audio disc is played back by a video disc playback device, the scanning needle is caused to perform a normal tracking operation in the same way as when playing a video disc, and the previously recorded signal can be picked up and played back from the scanning needle. By supplying the reproduced signal to the adapter, the original audio signal etc. can be demodulated.

Therefore, the above-mentioned capacitance change reading type video disc and capacitance change reading type digital audio disc proposed by the present applicant are played back by sharing the same capacitance change reading type video disc playback device. The above-mentioned digital audio disc and video disc have a feature that they can be played back interchangeably.

However, the above-mentioned digital audio disc and video disc are separate and independent discs, and the above-mentioned compatible playback cannot be said to be compatible playback in the strict sense.

Therefore, the present applicant has proposed, in Japanese Unexamined Patent Publication No. 59-207403 (Japanese Patent Application No. 58-83232), etc., by recording and forming analog recording tracks and digital recording tracks in a mixed manner depending on the recorded information content. We have proposed an information signal recording disc that can maximize the respective advantages of the above-mentioned video disc and digital audio disc, and that can be reproduced in a completely compatible manner.

Problems to be Solved by the Invention In the reproducing device for reproducing information signal recording disks proposed above, the information signal reproduced from the analog recording track and the information signal reproduced from the digital recording track are different from each other. Since their modulation formats are completely different, it is necessary to demodulate each using a dedicated demodulation circuit (decoder). Therefore, it is necessary to identify whether the playback track is an analog recording track or a digital recording track, and to use a signal processing circuit such as a required demodulation circuit. It is necessary to switch. However, the present applicant proposed JP-A-59-20 on the same date as the above proposal.
The above switching in a reproducing device such as No. 7404 (Japanese Patent Application No. 58-83233) is performed by error checking using an error check code (for example, a cyclic redundancy check code) in a digital signal reproduced from a digital recording track. Since this was done based on the correctness of the result and the presence or absence of the playback vertical synchronization signal, it takes several hundred microseconds to several milliseconds to determine the identification of the playback track, and there is a risk that one circuit switching may be delayed by the time required for the judgment, resulting in abnormal operation. was there.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an information signal recording disk that solves the above-mentioned problems by recording a notice signal on one or more tracks prior to the recording position for switching between analog recording tracks and digital recording tracks. shall be.

Means for Solving the Problems In the information signal recording disk of the present invention, a switching notice signal is recorded on all or part of the tracks up to several tracks immediately before the switching recording position between the digital recording track and the analog recording track. It becomes.

By reproducing the above-mentioned switching notice signal, it is possible to notify the reproducing device in advance that the switching recording position between the digital recording track and the analog recording 1 to 1 rack will be reproduced immediately thereafter.

Embodiment FIG. 1 is a diagram schematically showing an embodiment of the main part of the track pattern of the disc of the present invention. In the figure, a switching notice signal is recorded in a track section 4 of a total of two tracks shown in satin, from just before the 5th track to just before the 4th track from the switching recording position 3 between the analog recording track 1 and the digital recording track 2. . To explain this switching notice signal in detail, analog recording track 1 contains a frequency-modulated wave frequency-modulated by a frequency-division multiplexed signal consisting of a composite video signal and a frequency-modulated audio signal, similar to a conventional video disc. A chapter address signal A is recorded within each vertical blanking period of the composite video signal.
c, time address signal AT and page address signal A
N is multiplexed and recorded in a total of three locations for each 11-(period).The chapter address signal Ac is an address signal indicating the signal recording position on the disc in the order of the recording program;
The time address signal Av is an address signal indicating the total time, and the page address signal AN is an address signal indicating the number of tracks, starting from the recording position of the reference signal fp3, which will be described later. Each of these address signals consists of 29 bits.

FIG. 2 shows an example of the signal format of the page address signal AN. In the figure, a fixed pattern synchronization signal is placed in the first to fourth bits indicated by 5YNC, a line identification code is placed in the next two bits, and a voice identification code is placed in the next two bits. The code is placed.

The line identification code is a code for identifying the scanning line number on which this address signal is transmitted, and the audio identification code is a code for identifying the type of recorded audio signal (for example, stereo, monaural).

This is a code indicating whether the person is bilingual, etc.). Furthermore, a code indicating a track number is arranged in a total of 20 bits, 6a to 6e, from the 9th bit to the 28th bit, and the last bit is a parity pit.

On the other hand, digital recording track 2 contains pulse code modulated digital data (such as digital audio data) that is pulse code modulated with a total of four channels of information signals related to audio signals and still images, as will be described later. One word of each channel of component encoded data is added with redundant bits to form one block (frame) of the signal format shown in Figure 3, and each block is synthesized in chronological order. A frequency-modulated wave signal obtained by frequency-modulating a carrier wave of, for example, about 7 MHz is recorded.

Here, in one block of signals shown in FIG. 3, S indicates the arrangement position of an 8-bit fixed pattern synchronization signal indicating the start of the block. ch-i.

Ch-2, Ch-3 and Ch-4 each indicate the arrangement position of one word of the 16-bit digital signal (that is, the digital audio signal and component encoded data) of one channel among the four channels.

Furthermore, P and Q shown in FIG. 3 are each 16-bit error correction codes. Furthermore, CRC is a 23-bit error detection code.
ch-1 to ch-4, P, Q arranged in the same block
For example, it is the 23-bit remainder obtained when each word of
It is used to divide the signal up to the first bit by the generator polynomial, and when the resulting remainder is zero, it is determined that there is no error. Furthermore, in FIG. 3, Adr represents various control signals (
This shows the multiplexing position of 1 bit of address signal). This control signal distributes each bit data and transmits one bit in one block. For example, all bits of the control signal are transmitted by 196 blocks (that is, the control signal is composed of 196 bits).

).

Furthermore, U is two reserved bits called user's bits. One block of signals is composed of a total of 130 bits from S to U shown in Fig. 3, and the digital signal is divided into blocks of 44.056 kHz.
(or 44.1 kHz) and transmitted in time series.

The above 196-hit control signal has a configuration in which four types of address codes of 49 hits each are synthesized in chronological order.
All of these four types of address codes have a signal format as shown in FIG. In Figure 4, all 4
The first 24 bits of the 9-pin address code, indicated by 5YNC, are synchronization signals, and there are 4 types of values (time address, time address, etc.).

The track number address code and the chapter address differ depending on the address code (two types). The next 4 after the sync signal
The bits include a source mode indicating the combination of recording signals described above, a normal/stop mode discrimination signal indicating whether or not stop playback is to be performed, and the following two bits.
Address data is placed in the 0 bit, and the last 1 bit is a parity pit.

If the above address data is a time address code, it is time data that indicates how long the track position on the disc where the code is recorded is during normal playback from the recording start position of the disc. In the case of a chapter address code, this is data that indicates the number of the music program recorded from the recording start position on the disc at the track position where the code is recorded, and in the case of a j-rack number address code. is the same as the page address signal AN described above.

As will be described later, the composite video signal is converted into a predetermined signal format and recorded on the analog recording track of the disc at a rate of 4 fields per revolution. 89 for method
9.1 (= (59,94/4) x 60) rpm
750 for PAL system or SECAM system.
(= (50/4) x60) ROM. On the other hand, the digital recording track for one rotation of the disk has a rotation speed of 899. 2940 (= 44.056X 103X (
4159,94)) blocks are regenerated, and
The above 196-pit control signal is reproduced 15 times in one disc rotation period, and for a disc that is to be played at a rotation speed of 750 rpm, it is 352 g (= 44.100 x 10
3 x (4150) blocks are played,
Moreover, the above control signal is reproduced 18 times during one rotation period of the disk. Note that when the transmission frequency of the digital signal is 44.1kl-12, the analog recording track is 899. For a disc played at lppm, the digitally recorded tracks are played back at 900 rpm.

Therefore, the number of blocks per rotation is 2'940 (=
44. lX103X (1/15)).

Note that among component encoded data regarding still images, for example, pixel data of a luminance signal has a sampling frequency of 9 MH.
z, quantization number of 8 bits per pixel is transmitted at a sampling frequency of 88.112 kHz (or 88.2 kHz), and two types of color difference signals (RY) are transmitted.

(B-Y) pixel data each has a sampling frequency of 2.25
MHz, sampling frequency of 8 bits per pixel is 88. t12 kHz (or 88.2 kl
-1z). .

From the above, three types of address signals: chapter, time, and page (however, digital recording track 2 also has one type of chapter address signal) are recorded on both analog recording track 1 and digital recording track 2. Also, except for the synchronization signal (SYNC) and parity, all of them are 24 bits and indicate address data, etc. As schematically shown in Figure 5, these 24 bits are divided into 4 bits each, and these are divided into V+, T+ to T5.
As shown in Figure 2, ■1 is the line identification code and audio identification code in the address signal recorded on analog recording track 1, and the line identification code and voice identification code in the address signal recorded on digital recording track 2. As shown in FIG. 4, this is a mode discrimination signal. Further, in the case of a page address signal, a code indicating a track number is placed in T1 to T5.

In the case of a page address signal, the above T+, T2.

Four bits each of T3, Ta, and T5 are used to represent numerical values in the 10,000, 1, 100, 10, and - digits of the track number in hexadecimal notation. However, for a disc that can record up to 60 minutes per side, the maximum number of tracks is 5400.
There are 0 pieces. Therefore, the maximum value of the 4-bit value indicating the ten-thousand-digit track number indicated by T1 is "5" in hexadecimal notation, which is rololj in binary, so the most significant of the 4 bits indicated by T+ It can be seen that bits 1 to 1 (in the page address signal AN shown in FIG. 2, the 9th bit, the shaded 1 bit) are always "0".

Therefore, in this embodiment, the most significant bit of T1 is set to "1".
'' and the 4 bits shown as vI in FIG. 5 are selected as a predetermined value, and the code is used as the above-mentioned switching notice signal. Next, the value of (1) above will be explained. The 4 bits corresponding to the above V+ in the page address signal AN shown in FIG. 2 recorded on analog recording track 1 are a line identification code and an audio identification code. ing.

How to use: The bit positions corresponding to the upper two bits in (1) above in the page address signal recorded on digital recording track 2 indicate the combination of 4-channel digital data sources (audio signals, still images, etc.). A code is arranged, and whether it is a page address signal or not is determined from the value of a 24-bit synchronization signal indicated by 5YNC in Figure M4. When the decoder in the main device reproduces this page address signal, it converts the upper two bits of V1 into the same value "01" as the page address signal AN from the analog recording track, and sends it to the required circuit. is configured to output. Therefore, the address signal recorded on the digital recording track 2 is as long as the 24-bit synchronization signal is selected to a predetermined value indicating the page address signal.
Any value may be recorded in the position corresponding to the upper two bits of v1.

Next, the lower two bits of (1) above will be explained.

When the value of the lower 2 bits is "11", the present applicant first applied to Japanese Patent Application Laid-Open No. 58-6562 and
This is the stop need proposed in No. 1, etc., and the disc playback device is configured to start stop motion playback using this stop code with priority, regardless of the values of other bits.

Therefore, "11" cannot be used as the lower two bits of ■1. Also, when reproducing the page address signal, the lower two bits of ■1 are "01" or "10", and the most significant bit of T1 is "1". In the case of
As proposed in No. 39775 and JP-A No. 60-5468,
Since the disk playback device is configured to process a recorded control 70-gram signal for interactive playback between an external TL grave having a judgment function and the disk playback device, "01" and "10" cannot be used either. Therefore, the value of the lower two bits of Vl is selected as rooJ. As described above, the switching notice signal is recorded by selecting the value of a total of 3 bits of the lower 2 bits of Vl and the most significant bit of T1 shown in FIG. 5 of the page address signal as roolJ.

Next, an example of the recording system of the above-mentioned disc of the present invention will be described. FIG. 6 shows a block system diagram of this recording system. In the figure, the VTR 8 is configured to convert two channels of audio signals into digital data with a sampling frequency of 44.056 kHz and PCM modulation (pulse code modulation), for example, with a quantization bit count of 16 bits per sampling point. , a signal consisting of an error check code and an error correction code is inserted into a composite synchronization signal as a video period signal of a composite video signal, which is frequency-modulated and recorded in advance on a slanted track on a magnetic tape. Reproduce. On the other hand, the VTR 9 plays back a magnetic tape on which a two-channel still image signal, which is, for example, component-encoded pixel data with 8 bits of quantization bits per sample point, is frequency-modulated and prerecorded on an inclined track. The VTRs 8' and 9 are each operated synchronously based on a synchronizing signal from a synchronizing signal generator (SSG) 10, and frequency demodulates the reproduced signal of each two channels to be sent to the digital processors 11 and 1.
2, respectively.

The digital processors 11 and 12 are supplied with the frequency demodulated reproduction signal, and use the reproduced error checking code and error correction code to correct any errors in the reproduced digital data or reproduced component encoded data of the video period. , the digital processor 11 has a matrix bit number of 16
A two-channel digital audio signal with a sampling frequency of 44.056 kHz is supplied to the digital recording track encoder 13, and the digital processor 12 samples two channels of pixel data each with a quantization bit count of 8 bits. The signal is extracted at a frequency of 88.112 kHz and supplied to the digital recording track encoder 13.

The above digital recording track encoder 13 is a 5S
Under the control of the output signal of G6, one block of signals in the signal format shown in Fig. 3 is generated, and this is transmitted in time series at a transmission frequency of 44.056 kl-1z in units of blocks (frames). The synthesized digital signal is then used to frequency modulate a carrier wave of, for example, 7 MH2.
q first FM signals are supplied to the terminal 14a of the switch circuit 14.

On the other hand, the above-mentioned composite video signal etc. are recorded on the inclined track of the recorded magnetic tape (master tape) to be played back by the VTR 15, and the time code track is recorded with, for example, the American SMPT E (5ociety
of Motion P 1ture andTel
(evision Engineers) JtJ time code is recorded. The first time code played from this time code track and the second time code played from the same time code track by the VTR 8 are each supplied to the synchronizer 16, where the same time code is played back. Like VTR15
is converted into a signal that controls the running of the master tape.

As a result, the VTR 15 is synchronized with the VTRs 8 and 9. In addition, the composite color video signal and the two-channel audio signal reproduced from the inclined track of the master tape by the VTR 15 are sent to the analog recording track encoder 1.
7.

This encoder 17 was first developed by the applicant in 1986-23.
Since it is publicly known as disclosed in Japanese Patent Application No. 998 (Japanese Patent Application No. 52-25262), a detailed explanation thereof will be omitted.
The input color video signal is separated into a luminance signal and a carrier color signal, and the carrier color signal is low frequency converted to the high frequency region of the luminance signal, and then band-sharing multiplexed to the band-limited luminance signal to produce a composite color video signal. On the other hand, the audio signal (2 channels) is frequency-modulated and then subtracted by 11 frequencies from the above-mentioned composite color video signal. Also, the encoder 17
A pig address signal gAc, a time address signal AT and a page address signal AN are generated and multiplexed within each specific IH period within the vertical blanking period of the above-mentioned composite color video signal, and furthermore, this signal is A predetermined carrier wave is frequency-modulated with a signal obtained by frequency-division multiplexing a frequency-modulated audio signal to generate a second F M (g signal), which is supplied to the terminal 14 b of the switch circuit 14 .

A central processing unit (CPU) 18 controls switching of the switch circuit 14. While the CPU 18 is supplied with the time code reproduced by the VTR 8, based on the signal from the 5SGIO, the l/ranking signal generator 19 generates first and second tracking control reference signals (g, When the third reference signal fP3 generated together with fp+ and fP2 (hereinafter referred to as a reference signal) is supplied, a predetermined time code value to be switched is input, and the reference signal fP3 is input, the switch circuit 14 is activated. Control switching. Furthermore, in this embodiment, predetermined bits of the page address signals of the address generation circuits in the encoders 13 and 17 are set to The control signal for setting the predetermined value is CP.
It is output from U18 to the address generation circuit. As a result, the switching notice signal described above is output for a certain period of time prior to the time when one of the first and ff12 FM signals is switched to the other.

In this way, the first FM signal from the encoder 13 or the second FM signal from the encoder 17, selectively output by the switch circuit 14, is supplied to the recording table@20. The recording device 20 is a known cutting machine using a laser beam, and is supplied with the above-mentioned first or second FM signal as a first input signal, and has a duration equal to one rotation period of the disc-shaped recording master 21, for example. The first reference signal fpt and the second reference signal fpt are switched every four field periods and arranged alternately.
A reference signal fP2 is supplied as a second input signal from the tracking signal generator 19, and a third reference signal fP3 is generated every rotation period of the recording master 21 corresponding to the switching positions of fp+ and fρ2. Provided as a third input signal. The recording device 20 uses the first modulated laser beam obtained by frequency division multiplexing the first and third input signals and modulating the radar beam with 19 signals, and the second input signal. The second modulated laser beam obtained by modulating the laser beam is applied to the photosensitive agent coated on the disc-shaped recording master 21 by 1/2.
They are separated from each other by about two track pitches and are simultaneously focused and irradiated. By passing this recording master disk 21 through a known developing process and an ink forming process, a disk having an electrode function and having a track pattern in which no internal grooves are formed is manufactured.

Next, the operation of the main parts of the reproducing apparatus for reproducing the disc of the present invention will be explained. Signals reproduced from digital recording tracks or analog recording tracks of the disk by known means are reproduced and demodulated by respective dedicated demodulation circuits and decoders, and then the reproduced address signals are supplied to the microcomputer through respective dedicated address data acquisition circuits. be done. The microcomputer follows the flowchart 17-1 shown in FIG.
Step 30): Decipher the value of the upper two bits.
Only when the value is "01", that is, when the reproduced address signal is a page address signal, the next step 31 is performed.
On the other hand, when it is "11", it goes to the adapter code processing routine, when it is "10", it goes to the time code processing routine, and when it is "00", it takes in the address signal again. At step 31, the microcomputer detects whether the most significant bit of the ten thousand digit shown by T1 in FIG. 1”, step 32
Move to.

In step 32, the microcomputer detects the value of the lower two bits of the four bits indicated by Vl in FIG. ), thereby causing the regeneration circuit to prepare for switching. This makes it possible to switch the reproduced signal processing circuit more quickly than in the past. Step 3
2, when the value of the lower 2 bits of Vl is detected as "11", the process goes to the block code processing routine and also to "
10'' and ``01'', the process shifts to the disc language processing routine for interactive playback described above. It should be noted that the operations of these processing routines are not related to the present invention, and therefore their explanations will be omitted.

It should be noted that the present invention is not limited to the above-described embodiment, and the switching notice signal is also recorded in advance at the position where the digital recording track is switched to the analog recording track, and the switching notice signal is also recorded at the position where the digital recording track is switched to the analog recording track. Not limited to the embodiments described above, recording may be performed on any part of the track section from immediately before or after the 5 tracks of the track switching recording position to the switching recording position, or even on the entire track section. good.

Effects of the Invention As described above, according to the present invention, a switching notice signal is recorded in part or all of the section from the switching recording position between the digital recording track and the analog recording track to just before the switching track, so that the switching notice signal is recorded during playback. By identifying the reproduction of the signal, the signal processing circuit can be switched quickly and easily, and abnormal operation of the reproduction device can be prevented.

[Brief explanation of drawings]

FIG. 1 is a diagram schematically showing an embodiment of the main part of the track pattern of the disc of the present invention, and FIG. 2 is a signal format 1 of the page address signal recorded on the analog recording track.
FIG. 3 is a diagram showing an example of the signal format 1 of one block of signals recorded on a digital recording track. FIG. 4 is a diagram showing an example of the signal format of an address signal recorded on a digital recording track. A diagram showing an example,
FIG. 5 is a diagram showing the main parts of each address signal shown in FIGS. 2 and 4 divided into 4-pid units, FIG. 6 is a block system diagram showing an example of the recording system of the disc of the present invention, and FIG. The figure is a flowchart for explaining the operation of the main parts of the reproduction system of the disc of the present invention. 1...Analog recording track, 2...Digital recording track, 3...Track switching recording position, 4...
Switching notice signal recording section, 8.9.15...VTR11
3... Digital recording track encoder, 17.
・・Analog recording 1~Rack encoder, 18...
Central processing unit (CPU). Patent applicant: Victor Japan Co., Ltd. Figure 1 Figure 4 Figure 7

Claims (1)

[Claims] A first digital signal obtained by further modulating a first digital signal in which one block of signals including at least a plurality of channels of digital data obtained by digitally modulating the first information signal is synthesized in block units in a time-series manner. a digital recording track on which a modulated wave signal is recorded, and an analog recording track on which a second modulated wave signal obtained by analog modulation with a second information signal including at least a composite video signal is recorded. A switching notice signal is recorded on all or part of the tracks up to several tracks immediately before the switching recording position between the digital recording track and the analog recording track on an information signal recording disk on which recording is performed in a mixed manner. An information signal recording disc characterized by: