JPS601650A - Information signal recording disk reproducer - Google Patents

Abstract

PURPOSE:To assure the accurate reproduction with no discrimination between analog and digital disks by reproducing the analog signal with the internal synchronization and then the digital signal synchronously with the transmission frequency included in the digital signal respectively. CONSTITUTION:When an analog disk is reproduced, a turntable 18 has synchronizing revolutions with the output of an internal oscillator 33 of a playe part 16. While the table 18 has synchronizing revolutions with the division output of an oscillator 30 after a switch circuit 29 of an adaptor part 17 when a digital audio disk is reproduced. Then the output data given from an address data fetching circuit 50 is extracted from a switch circuit 60 in an analog record/reproduction mode. While the output data synchronizing with the transmission frequency 44 having 100kHz contained in the record signal is extracted from an address data fetching circuit 58 in a digital recording track reproduction mode. Based on these output data, a scan stylus 41 is shifted at a high speed to the track position of a designated address.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an information signal recording disk reproducing device, and in particular to a recording track for digital signals mainly containing audio information and a recording track for analog signals mainly containing composite video signals. The present invention relates to a device for reproducing an information signal recording disc on which a mixture of information signals and information signals are recorded and formed.

PRIOR 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 "disk")
is known. This disc is called a video disc because the recorded information is mainly a composite video signal, and the recording track contains a modulated wave signal obtained by modulating a carrier wave with an analog information signal. Composite video signals, etc. are recorded. Note that on a video disk, 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 the recorded information is analog-modulated composite video signals, etc., the L-rack, such as the recording track of this video disc, is
Hereinafter, in this specification, for convenience, "analog recording [・rack]"
It is spelled as.

On the other hand, there are also discs in which an audio signal or an audio signal and a video signal are respectively digitally modulated and then synthesized in time series and recorded concentrically or spirally, for example, as changes in geometric shape. It is more widely known than before. The recorded information on this disc is mainly an audio signal, and the video signal is mainly a still image, which plays a role as auxiliary information that helps the imagination of the listener to the audio signal. Therefore, it is called a digital audio disc. It is called. In the recording track of this digital audio disc, an information signal such as an audio signal is digitally modulated, converted into a digital signal form, frequency modulated, etc., and recorded. For convenience, a track such as 1-Rack will be referred to as ``Digital Recording''-Rack J hereinafter.

).

By the way, in the above-mentioned video disk, previously recorded signals are reproduced by detecting changes in capacitance formed between the scanning electrode 11 and the disk, as proposed by the present applicant, and information signals are also recorded. Tracking control reference signals of different frequencies are recorded on both sides of the track (analog recording track), and tracking control is performed by comparing the reference signal levels during playback. 1. A video disc that does not require a guide groove is known. - As proposed by the present applicant, in the above-mentioned digital audio disk, the tracking control reference signal is connected to the information signal recording track (digital recording 1 It is known that there are capacitance-variable readable digital audio discs that are recorded on both sides of the disc and have no internal grooves. This digital audio disk is rotated at the same rotation speed as the above-mentioned electrostatic capacitance variable reading type video disk, and the frequency and reproduction method of the tracking control reference signal are the same. They are also similar in that they have a configuration in which a recorded signal can be read by detecting a change in capacitance. Therefore, even when this digital A-DI disk is played back by a video disk playback device, the scanning button is normally pressed for tracking operation in the same way as in the video disk playback 11, and the previously recorded signal is picked up from the scanning needle. By supplying the reproduced signal to the adapter, it is possible to demodulate the original car signal.

Therefore, the capacitance change reading type video disk and the capacitance change reading type digital audio disk proposed by the applicant mentioned above (both share the same capacitance change reading type video disk playback device). The above-mentioned digital audio disc and video disc have a feature that they can be played back in a so-called compatible manner.

Problems to be Solved by the Present Invention However, the above-mentioned digital audio A-disc and video disc are separate and independent discs, and although the above-mentioned compatibility is compatibility in the strict sense, There wasn't. On the other hand, compared to video discs, the green signal mentioned above is a digital signal on digital audio discs, 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 fidelity. 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, it is not possible to play back still images and sound at the same time. , analog signal transmission, it is possible to transmit information signals in a band of several Ml-1z Pl, degrees in real time, and to increase the accuracy of information, a band of about several tens of kl-11 Compared to digital audio discs that transmit information signals, this has the advantage that moving images can be played 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.

Therefore, the present invention is designed to distinguish information signal recording disks on which analog recording tracks and digital recording tracks 1 to 1 to 2 are mixed in accordance with the recorded information content, regardless of the type of recording 1 to 1 to 2 racks. It is an object of the present invention to provide an information signal recording disk (disc) reproducing device which can suitably reproduce data without overlapping the data, and in particular can reproduce digital signals from digital recordings 1 to 1q accurately at a predetermined transmission frequency.

Means for Solving the Problems The present invention provides analog modulation with an information signal including at least a composite video signal, and one modulated wave signal is recorded at a rate of N fields (N is a natural number) per rotation. One block is constructed by adding at least a synchronization signal, an error correction code, and an error check code i=J to the digital data of a plurality of V channels obtained by digitally modulating the analog recording track with the information signal, and the block unit is 44,100k per
An information signal recording disk formed by recording a mixture of digital recording tracks in which digital signals synthesized in time series at the Llz transmission frequency are further modulated and are recorded without synchronization with the composite video signal. A first reproducing layer that picks up the green signal and demodulates the reproduced signal from the analog recording track out of the reproduced signals from the reproducing means into the original information signal including the composite video signal. a reproducing circuit; a synchronous signal detecting circuit for detecting the synchronous signal in the reproducing digital signal from the digital recording track among the reproducing signals; and an output detection signal of the synchronous signal detecting circuit as an input signal; a signal generating circuit that is supplied as a signal, is phase synchronized with its input offset, and generates a signal having a frequency of a real number 8 of the input signal frequency;
a second reproducing circuit to which the output signal of the signal generating circuit is supplied as a master clock signal and demodulating and reproducing the reproduced signal from the digital recording track among the reproduced signals from the reproducing means into the original information signal; It is composed of
One embodiment will be described below with reference to the drawings.

Embodiment Before describing an embodiment of the information signal recording disk reproducing apparatus according to the present invention, an example of the recording system of the information signal recording disk (disk) to be reproduced will first be described. 1st
The figure shows a block system diagram of an example of the recording system of the above-mentioned disc. In the figure, 1 and 2 are 2-channel VTRs, to which a PCM recording/playback 1113.4J: synchronization signal is supplied, while a 2-channel audio signal pre-recorded on a magnetic tape, or 1 channel is an audio signal. As a signal, Sen's 1st A7 channel is an audio signal or still image No. 18, or both 2nd channel and 7th channel are reproduced as still image signals, respectively, and the P.C.
M recording playback 13. /I and is recorded here.

The above still image signal is an example. -C scanning line number 625
The signal form is such that 1Q component encoded data obtained by digitally modulating a signal related to a still image only in the video period of a tree-based composite color video signal is sequentially inserted into the video period of the composite color video signal.

The PCM recording/reproducing machines 3 and 4 record the Itsuno 1Δ as PCM (
It also generates an error check code and an error correction code, records these PCM signals on a magnetic tape with horizontal and vertical synchronization signals, and reproduces them.

-t911, these PCTVl recording and reproducing devices 3 and 4 record 6 information words (3 words each for both left and right V channels) during 1 water\11 scanning period (I N ), and 3511 data are recorded in one frame. Since the pause period () is set, the sampling frequency fS is 3xr HX (525-
35) / 525. Here, (+(+ is the horizontal scanning frequency, and when the PCM recording/reproducing devices 3 and 4 are operated in synchronization with 15.75kl-1z from the oscillator 5, kt-1
Substituting and overturning z, the sampling frequency [S is 44−, +00
kf-1z roars.

In this way, it is taken out from the PCM recording and reproducing machines 3 and 4! , : at sampling frequency 44.100 kl-1z.
The digital signals of 14/7 channels with quantization pitches of 1 to several 16 bits are supplied to a digital signal processing circuit 6, respectively. This digital signal processing circuit 6 is a controller 7
Under the control of the output, one block of signals of signal format 1- as shown in Fig. 2 is generated, and these are synthesized in time series at a transmission frequency of 44,100 kl-1z for each block. , further use this composite digital signal as an example) 5゛7
Frequency modulation (FM) LU of carrier wave of about M l-1z
i! '7 The frequency modulated wave signal is output to the terminal 8a of the switch circuit 8. FIG. 3 shows an example of the frequency spectrum 1 to 1 of the frequency modulated wave signal (first M signal) supplied from the digital signal processing circuit 6 to the terminal 8a of the switch circuit 8, and the carrier wave has data of 11''. At that time it was 7.6 Mt-l.
z, the data is 10'' indicates 5.8M1-17.

In addition, in the same figure, broken lines indicate if pl, fρ2 and fP3.
represents each frequency spectrum 1 to ram of the reference signals fP, fρ2, and fp3 recorded together with the first FM signal in the recording device 11, which will be described later.

Here, in the signal of 1 block shown in FIG. 2, a3 and S
indicates the start of a block and indicates the placement position of the 8-hit fixed pattern synchronization signal. Ct+-1゜0h-2, Ct
+-3 and C11-4 do not indicate the placement position of one word of a 16-bit digital signal.

These digital signals include 7) a digital audio signal obtained by pulse code modulation (PCM) L and 1q of a voice signal (audio signal), or a digital video signal obtained by PCMing a video A signal and 1q. For example, ■Ch-1~C
b '1 for 4 channels (each channel of 7 channels (1 word each of digital audio signals of 7 channels),
■Each of the 3 channels from CI+-1 to Ch-3
When placing one word each of 7-channel digital audio signals and placing two pixel data of a digital video signal, for example, M child number ε3 p1~ in 011-4, ■Ch-1 and Each channel data of the first 21-V channel stereo digital audio signal is placed in Ch-2, and each channel data of the second 2-channel stereo digital audio signal is placed in C11-3 and Ch-4. Zuru case and ■ch-, -'i
and each channel data of the 2-channel A7-channel digital audio signal is arranged in Ch-2, and C11-3
In some cases, pixel data of the same or different type of digital video signal having a quantization number of 8 bits is arranged in C11-4.

(1N shown in Figure IJ52), Q is 1 (3-bit error correction code, for example, P = W + ■W2■W3■W4, (1)Q=
T4 ・W1■T3 ・W2■King 2 ・W3■-"・W
4 (2) This is a signal generated by the following equation. However, (1).

■In the formula, W+, W2, W3, W4 are Ct+-1~
Each of the 16-bit digital signals of C11 to C4 (usually digital signals in different blocks), Φ is the auxiliary matrix of a predetermined polynomial, and ■ represents the sum of J modulo 2 for each corresponding bit. In Figure 2, CRC is 23
C11-1 to C11-4,1), Q(7) each') F
Example 4: This is the 23-bit remainder obtained when IC is divided by the generator polynomial 23 + X 5 + X4 - 1 -
It is used to divide the signal up to the 7th bit by the generator polynomial and detect that there is no error when the resulting remainder is zero. Furthermore, in Fig. 2, Δdr indicates the multiplexing position of 1 bit of various control signals used for random access, etc. This control signal distributes each bit data [no, 1 bit is transmitted in 1 block]. ,
For example, all the control signals are transmitted by the 196-bit cock (the control signal is composed of 196 signals).

Furthermore, U is 2 pins 1- for a reserve called a user's bit. Therefore, one block of signals from tS to U shown in FIG.
- It is synthesized at the same frequency as the sampling frequency of the D-A signal, 44.100 kLIz, and is transmitted in time series.

The above 196-bit control signal has a configuration in which four types of address codes of 49 bits each are synthesized in time series.
All of these four types of address codes have signal formats 1 to 1 as shown in FIG. In FIG. 4, the first 24 bits (not indicated by 5YNC) out of all 49 bits of address code 1 are synchronization signals, and their values differ depending on the four types of address codes. Next 4 bits of sync signal 1~
indicates whether Record No. 13 is in any of the above-mentioned combinations of ■ to ■, indicates the resource mode, and indicates whether or not to perform stop playback. Furthermore, address data is arranged in the next 20 bits 1 to 1, and the last 1 bit is a paridier 1 to 'C.

If the above address data is a time address code, the 1-rack position on the disk where the code is recorded is the playback time when normal playback is performed from the recording start position of the disk. This is the time data, and in the case of the A7 address code, the A code is recorded! Recording starts on the disc at the 1st to rack positions. (This is data that indicates which music program is recorded from the beginning.)

As mentioned later, GJ N I S C in γ IC 12
Since the color video signal is recorded at a rate of 4 fields per revolution, the disc 12 has a speed of 899.1 per minute (=(
59,911/4 )
'942.94 (-44,100x 1(13X (
4159,94) ) will be recorded and played back. Therefore, the control signals of 196 bits 1 and above are recorded and reproduced approximately 15 times during one rotation period of the disk.

il3, digital video related to still images A'(i'
When transmitting i5%, for example, the pixel data of the luminance signal has a sampling frequency of 9MH2 and L quantization per pixel of 8
Sampling frequency 88.2k using memory after bit
l-1z, and two types of color difference signals (RY), (B,
-Y) pixel data each has a sampling frequency of 2.25MHz
, the number of hangers per pixel is 8 pi [- is set to a sampling frequency of 88,112 kt-1z using memory, and one frame is transmitted as a signal as shown in Figure 5) A-pine 1~ .

In FIG. 5, the '1 word is 16 bits, and each pixel data with m child bit number of 8 bits is the upper 8 bits of one word.
Since the pixel data is placed in the bits 1 to 8 and the lower 8 bits, two pieces of pixel data are transmitted in one word. Further, Yl indicates il-572 pieces of bright image search data BY in the first vertical column at the leftmost end of the screen, and each pixel data arranged in order from the top to the bottom of the screen is the top 8 of the first word. bit,
Lower 8 bits of 1st sword, upper 8 bits of 2nd word 1
-7 lower 8 bits of second word, upper 8 bits of third word].

. . , are arranged in the order of the lower 8 bits 1 of the 286th word. Y2 is the 572 luminance pixel data group in the second vertical column from the left edge of both sides, and Y3 is the 572 luminance pixel data group in the third vertical column of [1] from the left edge of the screen. Similarly, Yi (i is 1 to 456) is the 572 pyroxene pixel data f! of the i-th column from the left end of the screen. Each pixel data is arranged in the same manner as the pixel data group Y1, and pixel data for one vertical column is transmitted in 286 words.

Also, (RY)j is the j-th pixel data group of the first digital color difference signal arranged vertically from the left edge of the screen, and ([3-Y)j is the j-th pixel data group from the left edge of the screen.
A total of 572 pixel data groups of the second digital color difference signal arranged in the vertical direction are shown, and each of the 572 pixel data groups in the same column is
The pixel data is sequentially transferred from the top to the bottom of the screen to the upper 8 bits of the first word, to the lower 8 bits 1 of the first word, to the second pixel data.
The pixels are arranged in the following order: the upper 8 bits of the word, the lower 8 bits of the second word, the upper 8 bits of the third word, ..., the lower 8 bits of the 286th word, and a 28G word consists of one column of pixels. Data is transmitted (however, jl;11
~114).

Transmitting pixel data in the vertical direction of the screen in this way is
This is to facilitate conversion of the number of scanning lines.

Also, the above combo screw No. 1 to 11 signals are 'X! 4 As shown in Figure 1, the digital luminance signal starts with Y4j-3.
1/1 pixel data l! f(Y4j-3, Y4j-2
, Y4 j + , Ya j ) and two types of digital color difference signals (-Y) j and (13-Y) j. The signals to be transmitted are sent from 1 to 1, and the 6 pixel data 8Y constituting the same unit are transferred to 6 rows of memory elements forming the memory circuit in the still image decoder. They are written separately and to the same address.

The header signals include the pixel data groups Yi, (R-Y)j and (13-), as shown by 1684 in FIG.
Y) j's il 684 pixel data Y are arranged at the initial position of each of the pixel data Y, and the pixel data immediately after that is transmitted as a signal for identifying various information of Y to the reproducing device. Each of the header signals 1-11 to 11684 consists of 6 words, and they have a common communication format I-.

Returning to Figure 1 again, the V-T'R9 plays back the magnetic tape on which the N'TSC color video signals, especially those related to moving pictures, are recorded together with the Furukawa signal, and then analyzes the playback signals. [The signal is supplied to the signal processing circuit 10.] The analog signal processing circuit 10 generates a frequency modulated wave signal having the same signal form as the video disc proposed by the applicant, and also multiplexes various address signals within the vertical blanking period and outputs the same. cover The specific configuration of the analog signal processing circuit 10 is well known as disclosed by the present applicant in Japanese Patent Application No. 52-25262, etc., so a detailed explanation thereof will be omitted. It generates 16 band-sharing multiplex signals and low-frequency conversion carrier color signals, and also generates an A7 pig address signal Ac and a time address signal Δ.
] and [- rack number address signals ΔN are separately generated and multiplexed within specific 11-(periods) within the vertical blanking period of the multiplexed signal, and further frequency-division multiplexed with the frequency modulated audio signal. A predetermined carrier wave is output by frequency modulation (1vl) using the signal obtained by the above-mentioned signal. Here, the address signal Ac is a polyaddress (U No., tie lx address 1: ;5zu △1 is a 13-bow record with a suitable normal playback time from the lead-in position (address signal indicating the position,
Furthermore, the number of 1-racks from the lead-in position when the 1-rack no-bar address signal ANL and the 1-rack formed by the γ isk rotation are set as the reference signal f[)3 with the recording position as one fish and η. These address signals are each composed of 29 bits.

The frequency deviation of the output signal of the analog signal processing circuit 10 (
~The ram should now look like the one shown in FIG. In the same figure, ■ indicates the carrier wave shift frequency band of 2.3M11Z of the frequency-modulated luminance signal, (a is the frequency of G corresponding to the sink depth, IM + - (Z frequency, fb is the frequency corresponding to the pedestal) The frequency of 6,6M l-I Z, fc indicates the frequency of 7,9M117 corresponding to the white peak.Also, 1
1+-, Iru indicate the lower sideband of the frequency-modulated luminance signal, 2 sidebands, and IIIL, IIILJ indicate the lower sideband of the signal obtained by further frequency modulating the frequency-modulated audio signals fΔl, fΔ2. , indicates the upper sideband 1°IV is the frequency modulated audio signal f△1° of 2°X/channel [82 carrier waves 3,43
Mllz, 3.73 MLlz is shown.

Furthermore, in FIG. 6, V indicates the frequency band of the low-pass converted carrier color signal obtained by low-pass converting the carrier color signal in the reproduced signal of the VTR9. Also, the first sideband f; LVI generated by frequency modulating this low-pass conversion carrier color signal
L, Vlu T, MaIc 2nd sideband Cfi+-.

Vlu respectively. In FIG. 6, the frequency spectrum indicated by a solid line indicates the frequency spectrum of the signal taken out from the analog signal processing circuit 10.

Note that reference signals rp+, fP2, and fp3, which will be described later, are located in an empty frequency band below the band hil Vu L. The reason why the occupied bands of the reference signals f P I to fP3 and the information signal are largely separated is because it is necessary to reproduce them on the same scanning side.

The switch circuit 8 modulates the frequency of the carrier wave with the digital signal of the signal formats 1 to 19 shown in FIG. 2 which is input to the terminal '3a. and the 6th FM signal that entered terminal 8b.
Under the control of the output signal of the roller 7, only one of the second FM signals with the frequency spectrum shown by the solid line J is selected and outputted by the recording device 11.
Output to.

The recording device 11 is supplied with an output signal of a known cutting gas C1 switch circuit 8 using a laser beam as a first input signal, and also outputs four fields of brightness from an input terminal 13 equal to one rotation period of the disc-shaped recording master. A burst-like first reference signal rp+ and a burst-like second reference signal rp2 are alternately supplied in 114 sequences every interval, and fPI.

A signal obtained by inserting a reference signal fpg into the switching position of fp2 is supplied as a second input signal, and a first modulated Rayleigh which multiplexes the first input signal and reference signal fD3 of these two human-powered signals゛-Convert to light, reference 1 word fp+
. This record was developed by a known method, passed through a culm (), and then passed through a known plate-making process to form an electrode (as shown in Fig. - A disc 12 with a rack pattern is manufactured.

In FIG. 7 - C1 disk 12 has a spiral track T.
Switch circuit 8J: The extracted information signal consisting of the video signal, sound angle signal, and address signal is returned to the frequency modulated wave signal (first FM signal, second FM signal) and is output according to the information content. Pi1~ are intermittently formed and recorded. One continuous spiral 1~ shown in solid line in Figure 7
Of the racks T, the tracks corresponding to the rotary valves of the disk 12 are designated jl, I2 . [Denoted as 3,... Each track is formed with information signal pins 1 on a flat surface; - per track, 1
During the horizontal scanning period <IH), for the analog recording track, the bits of the first reference signal fp+ and the bits of the second reference signal fp+ are placed on both sides in the longitudinal direction at a position corresponding to the recording horizontal retrace line 8b. The bits of signal fP2 are formed.

Only one of the bits of the reference signals fp+ and fp2 is formed at the intermediate position between the center lines of adjacent tracks, and the reference signals fPl and fP2 are recorded for the -1- rack. The side to be played changes every 1~lack. That is, in FIG. 7, the track of the reference signal rp+ is shown by a broken line, and the rack to 1 of the reference signal rp2 is shown by a chain line. vl.

v 2 , 'v 3 , . . . indicate the position of the vertical synchronization signal of each field. Also, each track LI+t2+t
3+... starting end positions, that is, reference signals fPI and fP2
The positions vl, v5 . The third reference signal fP3 is recorded in vg, . . . for a period of approximately 31-1, for example.

Further, one rotation period of the disk 12 is equal to, for example, four field periods of the video signal, and the vertical blanking period of the analog recording track is as shown in FIGS. 7a and 7b.

Tracks within the 7 range shown in G and d),' L 2
゜t3. ... is recorded.

Also, vertical blanking at each of the four analog recording tracks on the disk 12 +! In the inter-II recording portions a to (1), the address signals AC1Δ[ and ΔN are recorded in time series, respectively.

Furthermore, the digital recording track of the disk 12 is also formed on the spiral track 1-C, and the signal of one block of A-Pine 1-C as shown in FIG. 2 is 11. 'I
After being sequentially combined, the first I=M signal is recorded, and the vertical blanking period recording portions a to d do not exist. However, the above reference signal [ρ3 is the analog recording track reference signal [P
3 and are recorded in alignment in the radial direction of the disk 12.
3, and reference signals fp+ and fp2 are similarly recorded at 111 cycles on both sides thereof. However, the reference signal f
Regarding PI~rp3, there is no distinction between analog recording mill rack and digital recording mill rack, and disk 12.
The data are recorded at regular intervals, resulting in a total of 10 data.

This 1-rack pattern itself is the same as the video disc and digital audio disc previously proposed by the present applicant, and is also the same as the fJ A-format of the digital signal of the digital recording rack (FIGS. 2 and 4). ) and the signal format of the J digital video signal shown in FIG. 5 (particularly relates to still images as mentioned above, but can also transmit partial moving images) and the frequency spectrum shown in FIG. Furthermore, the signal frequency ranges 1 to 1 of the analog recordings 1 to 3 shown in FIG. 6 are also the same as those of the video disc.

On the other hand, the disk 12 is connected to the digital signal processing circuit 6.
The digital recording rack 1-rack in which the first FM signal is recorded, and the analog recording track 1-C in which the output second FM signal of the analog signal processing circuit 10 is recorded, respectively have recorded information contents. -C and the digital signal has a transmission frequency of 44.1.
The characteristics are found in the points recorded at 00k and 1z. J
In other words, audio information for reproducing audio signals in ultra-high fidelity, such as in music broadcasts, and image information for still image reproduction, such as encyclopedias, are recorded on digital recording tracks, while image information for moving images is recorded on analog recording tracks. It was recorded in -C.

Furthermore, the rotation speed of the digital audio disk proposed earlier by the applicant is 900 ppm, the number of blocks per rotation is 2940, and the transmission frequency of one block is 44.100 kl-IZ. On the other hand, the transmission frequency of one block of digital recording 1 to 1 rack for disk 12 is 44.100kl-IZ, which is the same as the above digital audio disk, but its rotational speed is the same as that of the video disk. 899. lppm,
Also, the number of blocks per rotation is 2942 as mentioned above.
The difference is that 94 is selected.

In other words, since the number of blocks per rotation is not a natural number and a fraction occurs, the disk 12 has an analog recording track recording area 13.1 indicated by diagonal lines as shown in FIG.
If the digital recording track recording area 14 is interposed between the digital recording track recording area 12C, the reference signal fp3 of the adjacent I to racks in the digital recording 1 rack recording area 12C.
Digital signal No. 45 at the recording start position (shown with a dashed line in FIG. 8) is recorded so that the same signal positions in one block are not adjacent to each other but are shifted by H.

Since the digital signal is recorded on the disk 12 without synchronization with the composite video signal, it has the advantage that the digital signal is recorded at an extremely accurate transmission frequency of 44.100 kI-1l.

The disc 12 on which analog recording tracks and digital recording tracks 1 to 1 are mixed is not distinguished from the video disc or digital audio disc proposed by the present applicant, and can be reproduced according to the present invention as described later. Can be played compatible with other devices.

Note that between the digital recording rack 1 and the analog recording mill rack of the disk 12, there are tracks 41 to 41 on which a first FM signal is recorded, for example, which covers a silent signal with no data as a modulation signal. Then, the number of tracks 1t81 to 4 tracks in which the second FM signal whose modulation signal is the color video signal in which the signal of the video period in the color video signal is reflected to indicate black image information is recorded is 1t81~
The rack is interposed.

Next, a disc playback device according to the present invention will be explained.

FIG. 9 shows a block system diagram of an embodiment of the apparatus of the present invention. In the figure, the disc playback device consists of a player 47 section 16 and an adapter section 17.

The turn-day knob 18 (rotated by the J motor 19) in the play rod 7 part 16 is operated. When the load switch of the key human power device 20 of the play V part 16 is operated, the switch output is input to the command processor 21, and further A microprocessor 22 is supplied with the signal.

The command processor 21 is supplied with key human power signals from the key human power device 20 and command signals from a device with a judgment function such as an external personal computer, and drives a display device (not shown) according to the display mode. or transfers the input to the microb 1 controller 22 for further processing.

The microcontroller 22 generates clocks and statuses as described later and supplies them to the command set 21, while controlling the operations of various mechanisms and circuits in the play 17 section 1G, and controls the operation of the various mechanisms and circuits in the play section 1G. - Make it possible to insert a redisk externally by inputting the switch. As previously proposed by the applicant, the disc 23 is contained in a storage case outside the play 17 part 16, and is stored in the play part 7 1G in which the disc can be inserted. When the case is inserted and handled, a predetermined mechanism (detailed explanation is omitted) leaves the storage case lid (lid plate) and the disc 23 inside the player section 16, and the disc 23 is removed. It is placed on the turntable 18.

On the other hand, at the same time, the player section 16 is provided at the front end of the above-mentioned glue plate, depending on whether or not there is a /j notch.
A plurality of microphone switches (not shown in the figure) provided in the central part of the microphone are designated as A or A, which was proposed by the present applicant in Utility Application No. 18/1463, 1983. as,
You can identify the recording contents and playback surfaces of various discs. Each output signal of the above microphone switch (for example,
A disc discrimination signal indicating whether the disc 23 is a digital audio disc or a video disc (discs according to the present invention are also identified as video discs) is input from the input terminal 24 to the microphone [1 ) 22. In response to this, the microcontroller 22 serially outputs, for example, a 25-bit status to the pin terminal 253 of the DIN type 8-bin connector.

The above 8-bin connector has eight pin terminals 251 to 258 arranged as shown in FIG.
1 receives address data from the adapter section 17, and a playback signal (R1:
A command signal from an external device having size II functionality, such as an external personal computer, is input to the pin terminal 254 as necessary. Also, pin terminal 25
5, the microprocessor 22 outputs a signal "-1", and the pin terminal 257 receives an external synchronization signal from the adapter section 17. Furthermore, pin terminal 258 is grounded and pin terminal 256 is not used. When connecting the Play
This differs from the case where the adapter section 17 is connected in that the reproduced audio signal is output from the pin terminal 256 and the pin terminal 257 is not used.

The status retrieved from the microphone processor 22 is information data indicating the surface of the disc 23 to be reproduced, the type of the disc 23, the recorded content, the reproduction mode, the key 1 aria position, etc., and is output in synchronization with the clock signal. , is supplied from the pin terminal 253 of the adapter part 17 to the status decoding circuit 27 via the pin terminal 263 of the DIN type 8-bin connector having pin terminals 261 to 268 as shown in FIG. The value of P1- indicating whether or not it is a disc is detected. Note that the above clock signal is connected to pin terminal 255.265.
are outputted to the status decoding circuit 27 and the like via the respective terminals.

The output signal of the status M reading circuit 27 is applied to the switching Shingetsu-C switch circuits 28 and 29, respectively, and the switch circuit 2 is applied during playback of a digital audio disc.
8 is connected to the terminal Δ side, and the switch circuit 29 is opened. On the other hand, when playing the disc or video disc according to the present invention, the switch circuit 28 is connected to the terminal V side, and the switch circuit 29 (J to develop.Therefore,
When the disc 23 to be reproduced is the disc 12 according to the present invention, the switch circuit 28 is switched to the terminal V side, and the switch circuit 29 is opened.

In the adapter section 17, there is a transmission frequency of 14, which is the transmission frequency of the digital signal (block) of the digital audio disc.
An oscillator 30 that outputs an oscillation frequency of 6,174 MHz, which is 0 times the frequency, is built-in. The output 6.174 M l-I Z signal of the oscillator 30 is supplied to the terminal A of the switch circuit 28 , while the frequency is divided by l/392 by the frequency divider 31 to T 15.75 kHz, and then sent to the switch circuit 29
is supplied to the terminal. The output terminals of the switch circuit 29 are connected to the switching circuit 32 via pin terminals 267 and 257, respectively.

When the output signal of the frequency divider 31 is input from the pin terminal 257, the switching circuit 32 selects it, and when the signal is not input, the switching circuit 32 selects the output signal of the oscillator 33J. It is configured to selectively output an H signal. FIG. 11 shows a circuit diagram of an example of this switching circuit 32. In the figure, a pin terminal 257 is connected to a capacitor 72, diodes 73, 74 . It is connected to a rectifying and smoothing circuit consisting of a 75° capacitor and a 7G resistor, and is also connected to one input terminal of a two-person horn AND circuit 80. The output terminal of the rectifying and smoothing circuit is connected to the input terminal 7 via an inverter 77 to a JAND circuit 78.
0 and J3, and one is connected to the other input terminal of an AND circuit 80 via inverters 77 and 79, respectively. Each output terminal of the A N D circuits 78 and 80 is connected to an output terminal 82 via a two-way OR circuit 81 .

In the switching circuit 32 having the above configuration, the horizontal scanning frequency 15 is input to the input terminal 70 from the oscillator 33 inside the player section 16
．． A signal with a frequency equal to 734 kl-Iz is always incoming and supplied to the AND circuit 78.

In this state, when playing a disc other than the digital A-D disc, the switch circuit 29 is closed, so no signal enters the pin terminal 257, and therefore the voltage generated across the resistor 76 is [ 1-level. Therefore, a high level signal is applied to one input terminal of the ΔN l) circuit 7ε3, and a low level signal is applied to one input terminal of the AND circuit 80. Due to this, the output signal of the AND circuit 80 is always at a low level, and on the other hand, the output signal of the AND circuit 78 becomes the output signal of the oscillator 33 from the input terminal 70, and this output signal is ORed.
The signal is output through a circuit 81 to an output terminal 82 as a seven-way rotation synchronization signal. That is, when rewriting the disk or video disk according to the present invention, the turntable 18 is rotated by the same 111J by the output of the oscillator 33 inside the play unit 17'16, so that the internal amount +111
).

On the other hand, since the switch circuit 29 is closed for digital audio disc playback [, +i, the pin terminal 257
The output signal of the frequency divider 31 is input to the frequency divider 31.

As a result, the external human horn signal from this pin terminal 257 is transferred to the inverter 71. After passing through each of the rectifier circuits and converting into a positive DC voltage, the polarity is inverted by an inverter 77 and a 1]-level signal is supplied to a CΔND circuit 78, while a high-level signal is further passed through an impark 79. It is supplied as a signal to the ΔN I) circuit 80. As a result,
The output signal of the AND circuit 78 is always at a low level.
A signal having a phase opposite to that of the input terminal is taken out from an AND circuit 80, further passed through an OR circuit 81, and output from an output terminal 82 as a motor rotation synchronization signal.

Returning to FIG. 9 again, if the γ-ick 23 is the disk 12, the motor rotation synchronization signal of 141.734 kLlz taken out from the switching circuit 32 is divided into 1/2 by the frequency divider 34. After being frequency-divided by 21, it is supplied to the comparator 35. On the other hand, a central portion of a gear 37 is fixed to the rotating shaft 36 of the heptad 19 . Teeth are formed at equal angular intervals on the outer circumferential side surface of the seven-geared Elf 37, and a magnetic detector 38 is provided at a position opposite to the teeth at a slight distance t. As a result, as the motor 19 rotates, the turntable 18. The disk 23 and the gear X7 gear 37 placed on the turntable 18 rotate, and -V'
1 every time the teeth of the gear 37 pass in front of the magnetizer 38.
pulses are taken out from the magnetic detector 38, and the comparator 3
5.

Here, since the analog recording track of the disk 23 records an N1-SC color video signal of 4 fields per revolution, the number of recording scanning lines is 1050 per revolution, and J, This means that 21 scanning lines are reproduced every time one pulse is output from the magnetic detector 38. Therefore, the frequency divider 34 divides the horizontal scanning frequency of 15.734 kHz into 1/21, and sends the divided output signal to the comparator 35 together with the output pulse of the magnetic detector 28.
Here, the voltage is converted into an error voltage according to the phase difference, and then supplied to the motor drive amplifier 39 to the motor 19.

As a result, the motor 19 receives the reproduction horizontal synchronization signal of the disk 23 from the frequency divider 34 (15.734 kl-I).
The rotation of the disk 23 and the motor 19 is controlled so that they are reproduced at the same frequency as the rotation synchronization signal of the heptad of Z.
is rotated at 899.1 rpm.

Motor 19. When the turntable 18 and the disk 23 begin to rotate as described above, and the user presses the start switch in the key manual device 20, the command pro is sent to the feed feed mechanism 40 via the lever 21 and microprocessor 22, respectively.
A signal is output to move the disk toward the inner circumference of the disk 23,
Thereafter, a scan 1141 is made one indentation onto the disk 23. Since the disk 23 has an electrode function and the scanning needle 41 is formed with an electrode, the f disk 23
An electrostatic capacitance is formed between the electrode of the scanning needle 41 and the capacitance changes "C" corresponding to the change in the geometrical shape of the recording 1 to Rack. converted into a signal.

Taken out from the pickup circuit 42: Reproduction signal (R
F signal) is supplied to a well-known tracking→novo circuit 43, where the reference signal f p + described above is supplied.

After fP2 is discriminated and separated, envelope detection is performed, and the detection outputs are differentially amplified and converted into a 1-racking error signal. This racking error signal is applied to the - racking coil 44, and the scanning lI41 always records information No. 18 without any deviation from 1 to rack. Instantly causes minute displacement in the rack width direction.

Further, the reproduction signal taken out from the pickup circuit 42 is supplied to an information signal reproduction circuit 45, where the second FM signal reproduced from the recording track for
After being demodulated, the reproduced composite video signal is output to the output terminal 46, and the reproduced audio signal is output to the output terminal 47.
Output to.

Furthermore, the reproduced signal taken out from the pickup circuit 42 is
It is supplied to the FM demodulation circuit 48 in the adapter section 17 via pins GI1 252 and 262, and after being FM demodulated there, it is sent to four vertical synchronization signal detection circuits, an address data acquisition circuit 50. The signal is supplied to a synchronization signal detection circuit 51 and a digital signal 4J demodulation circuit 52, respectively. The synchronization signal detection circuit 51 receives the second signal of the output signal of the FM demodulation circuit 48, which is reproduced from the digital recording track and subjected to FIVI demodulation.
This is a circuit for detecting the synchronizing signal (indicated by S in Figure 2) in the digital signal of the signal format shown in the figure.
It generates and outputs a 0 kHz synchronization signal detection signal and supplies it to the phase comparator 53. The phase comparator 53 compares the phases of the 44.100 kllz signal from the 1/140 frequency divider 54 and the synchronization signal detection signal 2, and uses a phase error signal corresponding to the phase difference as a control voltage. Voltage controlled oscillator (VCO)
) 55 to variably control its output oscillation frequency.

The signal taken out from the VCO 55 is sent to the frequency divider 54.
After being frequency-divided by /140, it is supplied to the phase comparator 53.

In other words, the phase comparator 53. VCO 55 and frequency divider 54
constitutes a well-known phase-locked loop (PLt), and a signal of 6,174 MHz, which is 140 times the frequency of 44.100 kHz, which is phase-locked to the synchronization signal detection circuit, is extracted from the VCO 55. This signal is supplied to the digital signal demodulation circuit 52 as a master clock signal through the switch circuit 28. This digital signal demodulation circuit 52 detects the presence or absence of an error by using the error detection code CRC in the demodulated digital signal 18 having the signal format shown in FIG. In this case, the error correcting code P, (1) is used to restore the original correct code, and the digital A-digit A to be transmitted is placed in the 1 position shown by C11-1 to C11-4 in FIG. While outputting the signal to the DA conversion and switching device 56, C11-3 and C11-
When a digital video signal is transmitted by being arranged in at least one of the four video signals, the digital video signal is supplied to the still image decoder 57. The DΔ conversion and switching device 5G performs digital-to-j analog conversion of the digital video signal, and then is controlled to be switched by the output of the address data acquisition circuit 58 by a switching circuit.

The still image decoder 57 receives the input digital video signal 1)r
+ What static image do you want?
A digital analog video signal is generated and outputted to the output terminal 59. On the other hand, the address data acquisition circuit 5
8 accumulates the incoming signals of 1 pixel per block and converts the control signal of the A-mat (No. R) to 1 as shown in FIG. 4 above.
After 41, data is taken in.

The data fetched by this address data fetch circuit 58 is supplied to the terminal of the switch circuit 60, while the data fetched by the DA
A switching signal is supplied to the conversion and switching device 56 and generated based on the data, so that only the A7 channel is passed through, and a predetermined two of the output terminals 61 to 64 of each of the four channels is passed through. Output to the above output terminals.

However, when A-11118 of the 1st channel is played back from the disk 14, the A-D A signal is taken out from all of the output horn terminals 61 to 64, and the A-D A signal of the 3rd A7 channel is taken out. When the signal is reproduced from the eye disk 23, the A-D and f'A signals from the output terminals 61 to 63 are taken out, and two types of A-D and A signals from the 2'X7 channel are also reproduced. If the selected type of 2-channel A-D A bow is connected to the output terminal 61 or 62 (or 6
3 and 6/l).

The address data capture circuit 50 discriminates and separates the address signal in the reproduced signal reproduced from the anodized recording track, captures the reproduced address data, and further captures/v address data to the terminals of the switch circuit 60. Supply to ΔN. Further, the discrimination circuit 65 is a vertical synchronization signal detection circuit/1.9
The vertical synchronization signal detection circuit 521 and the digital signal demodulation circuit 521 are supplied with a signal indicating the test result by the error check code CRC, and the detection signal is detected by the incoming I! f,
Yes, a signal has arrived indicating that the above test results are correct.
During this period, it is determined that the digital recording mill rack is being reproduced and is connected to the switch circuit 60 @terminal side, and on the other hand, the detection signal is received and the test result is determined to be incorrect. It is determined that the above log recording track is being reproduced during the period in which the signal J is received.
The C switch circuit 6o is switched and connected to the terminal ΔN side.

As a result, the switch circuit 60 switches the analog recording 1
- During rack reproduction, the output address data of the address data acquisition circuit 50 is taken out, while on the other hand, when the digital recording track is played back, the output address data of the address data acquisition circuit 58 is taken out. This playback address data is transmitted to the player section 16 via pin terminals 261 and 251, respectively.
The command processor 21 and the microphone [1 processor 22] are respectively supplied. The command blocker 21 sequentially displays the playback position of scan &l/11 using specified address data, while the microbrosserie 22 generates C based on the desired signal from the key input device 20 and the input address data. The various signals are outputted to the feed sending mechanism /IO, and in the case of random access, for example, the key manual device 20 is used to move one inspection piece 41 to the track position of the /j address at high speed.

In this way, even if digital recording tracks and analog recording tracks are mixedly recorded on the disc 23+, the recorded green signal of each recording rack 1- is suitably reproduced.

Note that if the disc 23 is a conventional digital audio disc, the output signal of the data decoding circuit 27 is
:The switch circuit 28 is switched to the terminal rA side by 1.7J, and the switch circuit 29 is closed, and the switch circuit 2
From the switch circuit 29, the output 0, 174M lIZ signal of the oscillator 30 is taken out and supplied to the digital signal demodulation circuit 52 as a master clock signal, and from the switch circuit 29, the output 15.75kHz signal of the frequency divider 31 is taken out. The signal is outputted to the frequency divider 34 as a -C motor rotation synchronization signal via the pin terminals 267 and 257 and the switching circuit 32, respectively.

Further, the switch circuit 60 is always connected to the terminal side.

Further, during playback of a conventional video disc, the switch circuit 28 is connected to the terminal V side, and the switch circuit 60 is normally closed to the terminal AN side, as in the case of playback of the disc according to the present invention.

In addition, when reproducing an analog recording track, in order to correct jitter during reproduction, as is well known, the scan ↑141 is instantaneously moved in the track scanning direction by a minute displacement [tllT ll,'l]. On the other hand, since the jitter of the reproduction digital recording of the digital recording track can be corrected by the gain digital signal demodulation circuit 52, the scanning side 4
The first displacement driving operation is unnecessary, and therefore, such an operation can be turned on or off depending on the reproduction track.

Displacement driving operation in the track scanning direction of this scanning 1141 (
The output signal of the circuit 49 that detects the presence or absence of a vertical synchronization signal can be used as a signal for turning on and off a jitter correction coil, etc.). However, the above-mentioned jitter correction operation may be carried out regardless of whether it is an analog recording track or a digital recording track. As I did, 11-1
Considering that the reference signals rp+ and fp2 are recorded at a period of C, the reference signal [ρ1°fP2 is reproduced at a period of 111 times. 6 ij method etc. can be considered.

As an application example, d3, the disc reproduced by the reproducing apparatus of the present invention records the composite video signal converted from the NTSC color video signal into a predetermined signal format at a rate of 4 fields per rotation into an analog recording rack. Although we have explained the recorded disc, it can also be applied to black and white composite video signals with a field frequency of 601-1z, and color video signals such as the 1) AL system and SIECAM system with 625 scanning lines. It is also possible to record a composite video signal at the rate of N fields (N is a natural number) per rotation. One rotation period of the disk 12 in which an analog recording track on which a composite video signal of N fields for one rotation is recorded and a digital recording track on which a digital signal is recorded as FM etc. are mixed. is, of course, equal to the IC value obtained by multiplying the vertical scanning circle + 111 by N.

Furthermore, the present invention is compatible with the digital audio discs and video discs proposed earlier by the applicant.
:Although the above description is not limited to this, it can also be applied to a disc configured such that recorded signals can be read with a light beam, and it can also be applied to a type of disc in which the reference signals fPl to fρ3 are not recorded. Of course, it can also be applied to

Furthermore, as the information signal to be recorded, as previously proposed by the present applicant in Japanese Patent Application No. 13944/1980, an external personal computer or the like can determine the difference between a device with the ability to reload the disk and the like. It also includes a block program for interactive control.

Further, as the information signals recorded on the digital recording track, all four channels can be information signals other than audio signals (for example, video signals), and can be used for, for example, encyclopedias, telephone directories, etc.

Effects As described above, according to the present invention, i) the modulated wave signal which has been subjected to logarithmic modulation with an information signal including at least a composite video signal is recorded at a rate of N fields i~ (N is a natural number) per revolution; The analog recording track is digitally modulated with an information signal, and one block is constructed by adding the same signal etc. to the digital data of multiple channels, and this block unit is There is a large coexistence of digital recordings in which digital signals synthesized in time series at a transmission frequency of 44.100 kHz are further modulated and recorded without synchronization with the composite video signal. It picks up and reproduces the recorded signal on the information signal recording disk, which is recorded on the information signal recording disk, reproduces the information signal from the analog recording I-rack containing the composite video signal, and also reproduces the reproduced digital transmission from the digital recording track. The signal is phase-synchronized with the detection signal obtained by detecting the synchronization signal of Since the configuration is configured to demodulate and reproduce the signal, the transmission frequency is exactly 44,100K from digital recording 1 to 100k.
From the digital signal played back on the l-1z, it is possible to reproduce famous information, etc. with extremely high fidelity and a wide divemic range compared to conventional video discs, especially when it comes to composite video recorded on analog recording racks. If the signal is a composite video signal of the scanning 51 number 525 tree system, it is synchronized with this composite video signal and the number of natural numbers (for example, 294
The transmission frequency is 44,100 kHz, which is higher than the transmission frequency when 0) blocks are recorded on a digital recording track (for example, 44,056 kHz), and the digital signal can be reproduced while accurately maintaining the required transmission frequency value. - Since it is possible to record audio signals and video signals (especially still images) with higher quality and higher fidelity, it is possible to record audio and video signals (especially still images) with slightly higher quality and higher fidelity than a mixed track recording disc that records digital signals in synchronization with composite video signals. information signals can be played back, and compared to conventional digital audio discs, moving images can be played back along with Yoshikawa information from analog recording tracks. Therefore, compared to conventional video discs and digital audio discs, Rich in artistry
It also has features such as being able to reproduce information signals with a wide range of applications.

[Brief explanation of the drawing]

FIG. 1 is a block system diagram showing an example of a recording system for recording information to be reproduced on a No. 15 recording disk by the device U of the present invention, and FIG.
Figure 1 shows an example of the Shinzuki format A-mat of the block, and Figure 3 shows an example of the frequency spectrum of the frequency modulated wave (i, i, tti) recorded in digital recording 1 to rack. is the signal of each address recorded on the digital recording track) Fig. 6 shows an example of the frequency spectrum of the frequency modulated wave signal and the reference signal recorded on the analog recording track.
Figures 7 and 7 are reproduced by the reproducing apparatus of the present invention: 1-
Figure 1 shows an example of a rack pattern, Figure 8 is a diagram illustrating the phase shift of blocks in the digital recording track of a disc to be reproduced by the reproduction apparatus of the present invention, and Figure 9 shows an example of the apparatus of the present invention. The block system diagram shown in Figure 10 is D.
Figure 11 is a diagram showing an example of an IN type 8-pin connector.
FIG. 2 is a circuit diagram showing an example of a switching circuit in the illustrated block system; 1.2.9... VTR15... Oscillator, 6... Digital signal processing circuit, 7... Controller, 8...
...Switch circuit, 10...Analog signal processing circuit, 12゜23...Information signal recording disk (disc), 1
3゜15...Analog recording track recording area, 14.
...Digital recording 1-rack recording area, 16...Play 87 part, 17...Attachment part, 18...Turn table, 19...Motor, 21...Command block [
1 Setsa, 22...Microprocera, 251-2
5g, 26+ to 268... Bin terminal, 27... Status decoding circuit, 28.2'9.60... Switch circuit, 30.33... Oscillator, 32... Switching circuit,
41...Scanning side, 45...Information signal reproducing circuit, 46
．． 59... Regeneration complex l! l! Image signal output terminal, 47.
61-64...Playback audio signal output terminal, 48...F
M demodulation circuit, 49... vertical synchronization signal detection circuit, 50.
58...Address data acquisition circuit, 51...Synchronization signal detection circuit, 52...Digital signal demodulation circuit, 56
. . . DΔ conversion and switching device, 57 . Still image decoder, 70 . . . input terminal, 82 . . . motor rotation synchronization signal output terminal. Fig. 7 fp3 Fig. 8 o3

Claims (1)

[Claims] (1) A modulated wave signal obtained by analog modulation with an information signal including at least a composite video signal is converted into one rotation source N field (
One block is constructed by adding at least a synchronization signal, an error correction code, and an error check code to analog recording tracks recorded at a ratio of N is a natural number) and multiple channels of digital data obtained by digital modulation with an information signal. A digital recording track in which digital signals synthesized in time series at a transmission frequency of 44.100 kl-1z for each block are further modulated and recorded without synchronization with the composite video signal. a reproduction means for picking up and reproducing the recorded green signal of the information signal recording disk on which a mixture of information signals are recorded, and a reproduction signal from the analog recording track among the reproduction signals from the reproduction means, including a composite video signal. a first reproduction circuit that demodulates and reproduces the original information signal; a synchronization signal detection circuit that detects the synchronization signal in the reproduction digital signal from the rack; A signal generation circuit which is supplied with an output detection signal of the synchronization signal detection circuit as an input signal, is phase synchronized with the input signal, and generates a signal having a frequency that is a real number multiple of the human input signal frequency; and an output of the signal generation circuit. 16. A second reproducing circuit, to which the signal is supplied as a master clock signal, demodulates and reproduces the reproduced signal from the digital recording track among the reproduced signals from the reproducing means into the original information signal. Information signal recording disk reproducing device. (2) The information signal recording disk reproducing apparatus according to claim 1, wherein the composite video signal recorded on the analog recording track is a composite video signal of a 525 scanning line system.