JPS60263373A - Information signal recording disk reproducer - Google Patents

Abstract

PURPOSE:To retrieve the contents of a digital recording track in a short time while looking at reproduced pictures, by reproducing the digital recording track at a high speed and an analog recording track at a low speed less than that of a normal reproduction mode respectively. CONSTITUTION:In a high-speed search mode an information signal reproducing circuit 55 outputs the reproduction signal of the 1st channel to an output terminal 57 in a forward search mode and the reproduction sound signal of the 2nd channel to an output terminal 58 in a reverse search mode respectively with the output control signal of a microprocessor 21. Therefore, the reproduction sound signal of the 1st channel which is reproduced normally out of the analog recording track in the foreard search mode is extracted for 0.4sec and then muted in the following 0.033sec for the reproduction sound signal which is outputted to an output terminal 75 from a switch circuit 31. The above-mentioned actions are repeated alternately. In a reverse search mode the sound reproduction signal of the 2nd channel reproduced normally is extracted for 0.4sec and then muted for the following 0.033sec. Thus a desired digital track can be retrieved in a short time while the reproduce pictures and sounds are monitored.

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, a digital recording track mainly containing still image information and an analog recording track mainly containing composite video signals are mixed. The present invention relates to an information signal recording disk reproducing apparatus that allows the recorded contents of digital recording tracks of an information signal recording disk to be retrieved in a short time while viewing a reproduced image.

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 contains a modulated wave signal obtained by performing analog modulation, in which a carrier wave is modulated with an analog information signal. Composite video signals, etc. are recorded. 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 the information is strictly an analog-modulated composite video signal, etc., tracks such as recordings 1 to 4 of this video disc are hereinafter referred to as "analog recording tracks" for convenience in this specification. shall be.

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. In the recording track of this digital audio disk, an information signal such as an audio signal is digitally modulated, converted into a digital signal form, and then frequency modulated and recorded.

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.

-〇- By the way, the above-mentioned video disc has a method proposed by the present applicant, which reproduces recorded signals by detecting changes in capacitance formed between the electrode on the scanning side and the disc. Also, information signal recording] - Reference signals for racking control with different frequencies are recorded on both sides of the rack (analog recording track), and tracking control is performed by comparing the levels of these reference signals during playback. Accordingly, a video disc that does not require a button guide tone is known. On the other hand, in the above-mentioned digital audio disc, as proposed by the present applicant, the tracking control reference signal is transferred to the information signal recording track (digital recording It is known that there are capacitance-variable readable digital audio discs without needle guide grooves that are recorded on both sides of the tracks. This digital audio disc is rotated at the same rotation speed as the capacitance change reading type video disc described in "F", and the frequency of the reference signal for tracking control and the method of reproduction are the same, and it is also static. The structure is also similar in that recorded signals can be read by detecting changes in capacitance. Therefore, even when this digital audio disc is played back by a video disc playback device, scan 11 is normally tracked and the recorded signal is picked up and played from scan r1, just like when playing a video disc. By supplying the reproduced signal to the adapter, the original audio signal etc. can be demodulated.

Therefore, the capacitance change reading type video disk and the capacitance change reading type digital audio disk proposed by the present applicant mentioned in ``-'' both share 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 in a so-called n-conversion manner.

Problems to be Solved by the Present Invention By the way, the high-speed search that searches for the edge information signal of a desired track on a digital audio disc in a short time has conventionally been performed by reproducing an address signal recorded on a disc. Then, the reproduction element is moved at high speed until the reproduction address signal becomes the same value as the external input address signal indicating the desired track position, and from the point where both values match, reproduction begins in the desired mode (usually normal reproduction mode). I was trying to do this. During this search operation period, the reproducing element picks up and reproduces the recorded signal on the disc, but since it is impossible to identify the original information of the reproduced signal information, the reproduced signal information is Muting was applied so that the sound would not be heard from the speakers and would not be displayed on the screen.

Therefore, when searching for a conventional digital recording track, the reproduced still image cannot be viewed, and the reproduction time of the digital video signal for one frame from the end of one notch operation (for example, the signal If a component-encoded digital video signal in the format 2 words per block is transmitted at a transmission frequency of 44.1 kHz or very close to this, the transmission time is approximately 1.9 seconds). If you click the search button, you cannot see the still image of the searched digital record 1 to the rack position, so there is a problem that there is a slight time delay in confirming the searched binding. To search for a location,
Conventionally, the only way to do this is by specifying an address signal as described in ``-'', which solves the problem that it is not possible to search for the digital recording track position where a desired still image is recorded while monitoring the reproduced image. had.

Therefore, the present invention provides a disk in which an analog recording track of an analog composite video signal related to an image representing the content is recorded at the leading position of each digital recording track portion on which a plurality of still images are recorded. To provide an information signal recording disk reproducing device which solves all of the above problems by reproducing digital recording tracks at high speed and reproducing analog recording tracks at a low speed below normal reproduction. The purpose is to

Means and Effects for Solving the Problems 10 - The present invention provides a reproduction signal of an information signal recording disk (disk) formed by a mixture of analog recording tracks and digital recording tracks, from the analog recordings 1 to 10 described above. a first reproducing circuit for reproducing the reproduced signal into a composite video signal having a predetermined horizontal scanning frequency of the television system; a second reproducing circuit that demodulates and reproduces the reproduced signal into the original information signal;
An oscillation circuit that generates a frequency that is a natural number multiple of the horizontal scanning frequency of the television system, and the output signal of this oscillation circuit is supplied as a motor rotation synchronization signal, and the information signal is supplied to the motor for rotating the recording disk as a motor rotation synchronization signal. a servo circuit that rotates in synchronization with the oscillation circuit; a master clock signal generation circuit that supplies a signal obtained by frequency-multiplying the output signal of the oscillation circuit to the second reproduction circuit as a master clock signal;
゛ At least during high-speed search, the reproducing element is moved at high speed so that the reproducing element scans at a speed ratio of about 100 times or more during the digital recording track scanning period, and the reproducing element during the analog recording track scanning period is moved at high speed. A reproducing element transfer control means for moving the reproducing element at a low speed so as to scan the element at a speed ratio equal to or lower than that during normal reproduction; switching circuit means for muting the output demodulated information signal of the reproducing circuit and selectively outputting the output composite video signal of the first reproducing circuit during the reproduction of the analog recording track of the reproducing element; During a high-speed search, at least the gist of a still image on a digital recording track is displayed on the playback screen, making it possible to perform a high-speed search on a digital recording track while at least monitoring the image. Each of the embodiments will be described below with reference to the drawings.

Embodiment Before describing an embodiment of the information signal recording disc reproducing apparatus according to the present invention, an example of a recording system of a reproduced information signal recording disc will first be described. 7th
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 two-channel VTRs, respectively, and synchronization signals are supplied from PCM recording/reproducing machines 3 and 4, while two-channel audio signals prerecorded on magnetic tape or one channel is audio. The other channel is an audio signal or a still image signal, or both channels are reproduced as still image signals, respectively, and the PCM recording/reproducing device 3
, 4, where it is recorded. The above still image signal is, for example, component encoded data obtained by digitally modulating a signal related to a still image only in the video period of a composite color video signal of a 525-scanning line system, which is a composite color video signal based on the NTSC system. The signal is sequentially inserted into the video periods of the synchronization signal.

The PCM recording/reproducing devices 3 and 4 perform PCM (pulse code modulation) on input signals, generate error check codes and error correction codes, and add horizontal and vertical synchronization signals conforming to the NTSC system to the PCM signals composed of these codes. - For example, these PCM recording/reproducing units 113 and 13-4 record 6 information words (3 words each for both left and right channels) during one horizontal scanning period (1 day). ), and there is a data pause period of 351-1 in one frame, so
The sampling frequency fs is 3xrHx (525-35) /
525. Here, b+ is the horizontal scanning frequency, and the PCM recording/reproducing devices 3 and 4 receive the NT from the oscillator 5.
When operating in synchronization with the horizontal scanning frequency of 15.734 kl-1z in the SC method, 15.
734 kl-1z, the sampling frequency fs becomes 44,056 kHz. Note that when recording PAL or SECAM color video signals recorded with 625 scanning lines, the horizontal scanning frequency is t5.625.
kl-1z, but since it is operated with rH set to 15.75kHz, the above sampling frequency fs is 44.10.
It becomes 0 kHz.

In this way, the sampling frequency 44.056 kl-1z (or 4
Four channels of digital signals having a frequency of 4.100 kHz and a quantization bit count of 16 bits are supplied to a digital signal processing circuit 6, respectively. Under the control of the output of the controller 7, this digital signal processing circuit 6 generates one block (frame) of signals in the signal format shown in FIG.
Synthesize in time series at a transmission frequency of 56 kHz (or 44.100 kLlz), and further frequency modulate (FM) a carrier wave of about 7 MH2 with this synthesized digital signal.
)L, and outputs the frequency modulated wave signal obtained from the terminal 8a of the switch circuit 8.

Here, in the signal of one block shown in FIG. 8, S indicates the start of the block, and indicates the arrangement position of the fixed pattern synchronization signal of 7i8 bits. Ch-1゜Ch-2, Ch-
3 and Ch-4 are each one of the 16-bit digital signals.
Indicates the location of the word.

This digital signal includes a digital audio signal obtained by subjecting an audio signal to pulse code modulation (PCM), or a digital video signal obtained by subjecting a video signal to PCM.

(As will be described later, of the four channels of digital data, two channels include still images and partial moving images).
The remaining two channels were filed by the present applicant in a patent application filed in 1984-1394.
．． It has been selected for control program signals, compressed audio data, etc. proposed in No. 4, etc.

The above control program signal is a signal that should be loaded into a device such as a personal computer with a judgment function that is connected to the disc playback device, and is a signal that is modulated using a self-clockable modulation method and is limited to the audio band. It is. In addition, the compressed audio data mentioned above is digitally modulated with a low frequency audio signal of about several kl-1z, such as an announcement pitch for explaining a still image or a sound effect that gives an acoustic effect to a still image. This is digital data that has been compressed by one or more of band compression, bit-wise compression (for example, non-linear quantization), or time-axis compression.

Further, P and Q shown in FIG. 8 are respectively 16-bit error correction codes.

Furthermore, CRC is a 23-pit error detection code, and Ch-1 to Ch-4, P are arranged in the same block.

Q(7) Analyze each '7-de as GfX23+X5 +X4
This is the 23-bit remainder obtained by dividing by the generator polynomial + When the remainder is zero, it is used to detect that there is no error.

Furthermore, in FIG. 8, Adr indicates a 1-bit multiplexing position of various control signals (address signals) used for random access and the like. This control signal distributes each bit data and transmits one bit in one block. For example, 19 bits are transmitted in one block.
All bits of the control signal are transmitted by 6 blocks (ie, the control signal consists 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.
．． 100 kl-1z) and transmitted in time series.

17- The above 196-bit control signal has a configuration in which four types of address codes each having 49 pits are synthesized in time series,
All of these four types of address codes have a signal format as shown in FIG. In Figure 9, all 4
The first 24 bits indicated by 5YNC among the address codes of 9 bits 1 to 1 are synchronization signals, and their values differ depending on the four types of address codes. The next 4 bits of the synchronization signal indicate the source mode of the recording signal, which indicates the above-mentioned combinations, and a normal/stop mode discrimination signal indicating whether or not stop playback is to be performed.Furthermore, the next 20 bits indicate the address. Data is placed, and the last bit is a parity hit.

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 indicating which music program number 18- from the recording start position of the disc is recorded at the track position where the code is recorded.

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 12 at a rate of 4 fields per rotation, so the number of rotations of the disc 12 during playback is equal to the composite video signal. If is NTSC system, 899.1 (= (59,04/4) x6
0) ROM, 750 (= (50/4) x 60) rpm in the case of PAI one-way system or SECAM system. Therefore, the digital recording track for one rotation of the disk 12 has a rotation speed of 899. 2940 (-44,056x 1
03 x (4159, 94)) blocks are reproduced, and the above 196-bit control signal is reproduced 15 times in one disk rotation period, and on the other hand, when the number of rotations is 75Or
3528 (-44
, 100x103 x (4150)) blocks are played, and! And the above control signal is
It will be played 18 times in the rotation room.

Note that when transmitting a digital video signal related to a still image, for example, pixel data of a luminance signal has a sampling frequency of 9.
M1-1z, with a quantization number of 8 bits per pixel, is converted to a sampling frequency of 88,112kl-12 (or 88.2k)lz) using a memory, and two types of color difference signals (R-
The pixel data of Y) and (B-Y) are respectively sampled at a sampling frequency of 2.
25 M l-1z, 8 bits of quantization per pixel uses memory at a sampling frequency of 88.112 k
1-12 (or 88.2 kl-12) and one frame is transmitted in a signal format as shown in FIG.

Here, the number of pixels in the horizontal direction of the luminance signal of the 525 scanning line method is approximately equal to the value obtained by dividing the sampling frequency of 9 M f-1z by the horizontal scanning frequency of 15,734 kHz.
Of these, for example, only 456 pixels, excluding pixels in each horizontal and vertical blanking period and pixels for overscan, are transmitted.

In addition, each sampling frequency of the two types of color difference signals is 1 of the luminance signal.
/4 2.25MH2, so each 114 pieces (-45
6/4) pixels are transmitted. In addition, in the case of the 625 scanning line method, the number of pixels of the horizontal luminance signal is 576 because the horizontal scanning frequency is 15.625 I, but as above, for example, 456 pixels are transmitted.

On the other hand, the number of pixels in the vertical direction (effective number of scanning lines) is 5 scanning lines.
For example, 418 pieces are selected for the 25-tree method, and 572 pieces are selected for the 625-tree method. As a result, the number of transmission pixels of one frame's worth of luminance signals can be stored in four 64 kRAM (random access memories) with almost no excess or deficiency.

In FIG. 10, one word is 16 bits, and each pixel data with 8 bits of quantization bits is the upper 8 bits of one word.
Since the pixel data is placed in the pixel i- and the lower 8 bits, two pixel data are transmitted in one word. Furthermore, as mentioned above, when transmitting data in which the digital video signal for one frame is digitally modulated using the NTS C color video signal, the luminance signal is divided into 4 in the horizontal direction.
Consisting of 56 pixels and 478 pixels in the vertical direction,
Assuming that each pixel in the weight direction is transmitted, as shown in FIG.
and two types of digital color difference signals (R-
Y)v+ ~(RY)v114, (B-Y)v+
~(B-Y)vl14 and a total of 684 header signals Hv+~l''v684 of 6 words each arranged at the initial position of each of these pixel data groups are synthesized in time series. It is a digital signal of 167.580 words.

Therefore, since one frame of this component-encoded digital video signal is recorded in two channels as described above, it is approximately 1.9 seconds〈 -167580÷44.0
56 x 103 ÷ 2).

Further, Yv+ indicates a total of 478 luminance pixel data groups in the first vertical column at the leftmost end of the screen, and each pixel data is arranged in order from the top to the bottom of the screen, and as shown in FIG. The uppermost 8 bits of the word are arranged with the uppermost pixel data YO, the lower 8 bits of the first word are arranged with the second pixel data Y456 from the top, and the upper 8 bits of the second word are arranged with Y912 . The lower 8 bits of the second word contain Y1.
The upper 8 bits of the 368° third word contain Y1824.・
..., the lower 8 bits of the 22nd to 239th words contain the topmost pixel data Y.
217512 is placed. Not shown in Figure 10, YV2 is a total of 478 luminance pixel data groups in the second vertical column, second from the left edge of the screen, and YV3 is a total of 478 luminance pixel data groups in the third vertical column, third from the left edge of the screen. Similarly, Yvi (i = 1 - 456) indicates a total of 478 luminance pixel data in the first vertical column from the left end of the screen,
Each pixel data is arranged in the same manner as the pixel data group Yv+, and pixel data for one vertical column is transmitted in 239 words.

Also, (RY)vj is a total of 478 pixel data groups of the first digital color difference signals arranged in the j-th vertical direction from the left edge of the screen, and (B-Y)vj is the j-th pixel data group from the left edge of the screen. word 4 of the second digital color difference signal arranged vertically in
78 pixel data groups are shown, and each of the 478 pixel data groups in the same column is the upper 8 bits of the first word in order from the top to the bottom of the screen.

f Lower 8 bits of 1st word, upper 8 bits of 2nd word, lower 8 bits of 2nd word, upper 8 bits of 3rd word
Bits, lower 8 bits of the third word,...

They are arranged in the order of the lower 8 bits of the 239th word,
Pixel data for one vertical column is transmitted in 239 words (J is 1 to 114). For example, a 6-word header signal is arranged at the initial position of each of the above divided pixel data groups.

As shown in FIG. 10, the component encoded signal is a digital luminance signal consisting of four pixel data groups starting with Yv(4j-3), YV(4j-3) and YV(4j-
2>, YV(4j-1).

Yv(4,i) and two types of digital color difference signals (R-
Y)vj and (B-Y)vj It is a signal format in which six pixel data groups are treated as one unit, and each unit is transmitted in time series.

The header signal is placed at the initial position of each of the 684 pixel data groups of the pixel data groups Yvi, (RY)vj and (B-Y)vj, as shown by Hv+~l-1v684 in FIG. The pixel data group is arranged and transmitted as a signal for causing the reproducing device to identify various information of the pixel data group immediately after the pixel data group.

Each of the header signals Hv+ to Hv684 consists of 6 words, and they have a common signal format.

Referring again to FIG. 7, the digital signal processing circuit 6 outputs the frequency modulated wave signal (first FM signal) to the terminal 8a of the switch circuit 8 as described above. This first
The frequency spectrum of the FM signal is as shown by the solid line in Figure 12, and when the data is "1", it is 7.6M+-1.
7, and the end of rOJ data is 5.
8M1-12 carrier wave frequency is shown. In addition, in the figure, rp+, rpz, and fp3 indicated by broken lines are reference signals f recorded together with the first FM signal in the recording device 11, which will be described later.
The frequency spectrum of Pl+ rpz and fp 3 is shown.

On the other hand, the VTR 9 reproduces the magnetic tape on which the color video signal is recorded together with the audio signal, and supplies the reproduced signal to the analog 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 signal. 25-ru. The specific structure was disclosed by the applicant in Japanese Patent Publication No. 58-2399.
The analog signal processing circuit 10 generates a band-sharing multiplexed signal of a band-limited luminance signal and a low-band-converted carrier chrominance signal, which is well known as disclosed in No. 8, so a detailed explanation thereof will be omitted. Furthermore, a chapter address signal Ac, a time address signal △T, and a track number address signal AN
are separately generated and multiplexed within each specific 1H period within the vertical blanking period of the multiplexed signal, and the signal obtained by frequency division multiplexing with the frequency modulated audio signal is used to control the frequency of a predetermined carrier wave. Modulate (FM) and output.

Here, the address signal Ac is an address signal indicating the signal recording position on the disk in the order of the recording program, the time address signal A is an address signal indicating the total time, and the track number address signal AN is the track formed by the disk rotation address. The reference signal fp3 is an address signal indicating the number of tracks, with one recording position as the starting point, and each of these address signals is composed of 29 bits.

26- The frequency spectrum of the FM signal from the output box 2 of the analog signal processing circuit 10 is as shown in FIG. In the same figure, ■ indicates the carrier wave shift frequency band of 2.3M1-12 of the frequency-modulated luminance signal, fa corresponds to the sync chip, a frequency of 1-6, 1MH7, and fb corresponds to the pedestal. 6, 6MHz frequency, fc is Why 1
- shows the frequency of 7,9M+-17 corresponding to the peak.

Further, IIL and ITU indicate the lower sideband and upper sideband of the frequency-modulated luminance signal, and nIL and IIIu indicate the frequency-modulated audio signal FAI.

The lower sideband and upper sideband of a signal obtained by further frequency modulating fA 2 are shown. IV is a carrier wave 3.43 MH2 of two channels of frequency modulated audio signals fAl and fA2.

3.73M1-12 is shown.

Further, V indicates the frequency band of a low-pass converted carrier color signal obtained by low-pass converting the carrier color signal in the reproduced signal of the VTR 9. Further, the first sidebands generated by frequency modulating the low frequency conversion carrier color signal are shown as VTL and VILJ, and the second sidebands are VIL and U, respectively. 1st
In FIG. 3, the frequency spectrum indicated by a solid line indicates the frequency spectrum of the signal taken out from the analog signal processing circuit 10.

4 [Oh, reference signals fp+, fp2 and fP 3 to be described later
is located in an empty frequency band below the band Vl +-. The purpose of separating the occupied bands of the reference signal fp+ to fP3 and the information signal is because it is necessary to reproduce them using the same reproduction button.

The switch circuit 8 receives a first FM signal having a frequency spectrum as shown by a solid line in FIG. 12 which has entered a terminal 8a, and a second FM signal having a frequency spectrum as shown by a solid line in FIG. 13 which has entered a terminal 81). Among the signals, only one of the FM signals is selectively outputted under the control of the output signal of the controller 7 and outputted to the recording device H11. The recording device 11 is a known cutting device using a laser beam, and the output signal of the switch circuit 8 is supplied as the first input signal, and the recording device 11 is supplied with the output signal of the switch circuit 8 as a first input signal, and outputs four fields equal to one rotation period of the disc-shaped recording master from the input terminal 13. The burst-like first reference signal fpI and the burst-like second reference signal rp2 are alternately switched and alternately arranged in each period, and are related to the switching positions of rp+ and rp2. The third
A signal consisting of the reference signal @fP3 is supplied as a second input signal. The recording device 11 converts these two manual signals into first and second modulated laser beams, and simultaneously focuses them on the photosensitive material on the disc-shaped recording master at a distance of about 1/2 track pitch from each other. This recording master is subjected to a known development process, and then a known machine making process is used to produce a disk 12 having an electrode function and a track pattern as shown in FIG. 14 without a needle guide groove formed therein. .

In FIG. 14, the disk 12 has a spiral track T.
An information signal consisting of a video signal, an audio signal, and an address signal taken out from the switch circuit 8 is converted into a frequency-modulated wave signal (first FM signal, second FM signal), and bits are assigned according to the information content. Formed and recorded intermittently. Among one continuous spiral track T shown by a solid line in FIG. 14, the tracks corresponding to each rotary valve of the disk 12 are shown as jl, h, j3+, . . . . each track 2
9- has information signal bits formed on a flat surface, and no needle guide groove is formed. - For each horizontal scanning period (11-1>), for each analog recording track, a first reference signal rpI is applied at a position corresponding to the recording horizontal blanking period on both sides in the longitudinal direction. bit, second
The reference signal rp is formed by 2 bits.

Only one of the bits of the reference signals fP+ and fP2 is formed at an intermediate position between the center lines of adjacent tracks, and the reference signals fp+ and fp2 are recorded for the - track. The sides change with each track. That is, in FIG. 14, the track of the reference signal fP+ is shown by a broken line, and the track of the reference signal fP2 is shown by a chain line.

vl, v2. v3. ... indicates the position of the vertical synchronization signal of each field. Also, each track 11 * t2 +
t3, . . . , that is, the positions where the reference signals fP I and fP2 switch, Vl, V6 . The third reference signal rp3 is recorded in V91, for example, for about 3H period.

30- Also, the brightness of one rotation 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 shown in FIG. 14a.

1), track II within the range shown in C and d, t2°t
3. It is recorded at t4.

Further, the address signals AC, AT, and AN are recorded in chronological order in each of the four vertical blanking period recording portions a to d of the analog recording track of the disk 12, respectively.

Furthermore, the digital recording track t5 of the disc 12. j
6. [7, . The vertical blanking period recorded portions a to d do not exist.

However, the digital recording track t5. t6°t7.
..., the above reference signal rp3 is recorded in alignment with the reference signal fP3 of the analog recording track (i+ to t4) in the radial direction of the disk 12, and the reference signal rp3 is recorded on both sides thereof. fP1. fP2 is similarly recorded at a period of 11''. The reference signal fP l~rp
Regarding No. 3, recording is always performed at a constant period on the disk 12'7 regardless of whether it is an analog recording track or a digital recording track.

This track pattern itself is the same as the video disc and digital audio disc previously proposed by the applicant, and the signal format of the digital signal of the digital recording track (FIGS. 8 and 9)
The signal format of the digital video signal shown in FIGS. 0 and 11 (particularly related to still images as mentioned above, but can also transmit partial moving images) is also the same as that of the above-mentioned digital audio discs, and the signal format shown in FIG. The signal frequency spectrum of the analog recording track is also the same as that of the video disc.

On the other hand, the disk 12 is connected to the digital signal processing circuit 6.
”: The digital recording track where the first FM signal is recorded and the analog recording track where the output second FM signal of the analog signal processing circuit 10 is recorded are on the same surface depending on the recorded information content. It is characterized by the fact that it is mixed with In other words, audio information such as music signals to be reproduced in ultra-high fidelity, and image information to reproduce still images such as encyclopedias, are recorded on digital recording tracks, while image information indicating the contents of still images is recorded on analog recording tracks. recorded on the recording track.

In addition, in the digital audio disc previously proposed by the present applicant, the digital signal is 44.10 per block.
Only digital recording tracks synthesized and recorded in time series at a transmission frequency of 0 kHz are recorded, the rotation speed is 9 oorpm, and the number of recording blocks of the track for one rotation is 2940.

On the other hand, the disk 12 has N on the analog recording track.
When a TSC system color video signal is converted into a predetermined signal format as shown in FIG. lppm, and the number of recording blocks of the digital 33-recording track for one revolution is 2940, and if the PAL system or SFCAM system color video signal is converted to a predetermined signal format and recorded on the analog recording track, , its rotational speed is 7, which is the same as that of a video disc on which only such analog recording tracks are recorded.
50 rpm, and the number of recording blocks of the digital recording track for one rotation is 3528.

A disc in which such analog recording tracks and digital recording tracks 1 to 1 are recorded in a mixed manner, and a reproducing apparatus thereof, were first proposed by the applicant in Japanese Patent Application No. 58-83232.
The disc to be reproduced in the present invention has a composite image representing the information content of a still image recorded on the analog recording track immediately following the analog recording track. It is characterized by recording not only a video signal but also an audio signal representing the information content.

That is, as mentioned above, one frame of the component-encoded digital 34-video signal in the single signal format shown in FIG. 10 takes approximately 1.9 seconds, or 30 tracks ( 1 [the rotation period of the rack is 4 fields] is recorded on the digital recording track. To in FIG. 15 schematically shows 30 digital recording tracks in which digital video signals for one frame of this one still image are recorded in two channels, and this digital recording! - Digital information signals (the above-mentioned control program signal and/or compressed audio data) are recorded in the bottom two channels of rack To, as shown in the figure. These 30
As shown in FIG. 15, analog recording tracks TA are recorded on six tracks immediately before digital recording tracks 1 to Rack To. This analog recording track TA
An analog video signal (composite video signal) related to an image (two figures, symbols, etc.) for identifying the contents of a recorded still image on the digital recording track TD immediately after that.
and a two-channel analog audio signal Δ1., which also relates to audio for identifying the content of the still image. A2 is recorded respectively. Disk 12 to be reproduced in this embodiment
Information signals are sequentially recorded in units of 36 tracks as shown in FIG.

Here, the audio signal A1 of the first channel is recorded according to the scanning trajectory as it was when it was reproduced in the forward direction, whereas the audio signal A2 of the second channel is recorded according to the scanning trajectory as it was when it was reproduced in the forward direction. are recorded according to the scanning trajectory.

Further, the third reference signal fP3 described above is recorded as an index signal to clarify the switching point of the first and second reference signals rp+ and fP2 used in a tracking servo circuit in a disc playback device to be described later. However, if the above-mentioned switching point is defined as the point in time when the reference signal fP3 changes from nothing to present, then the length of the recording section of the reference signal fP3 does not matter (for example, in the patent application proposed by the present applicant, 56-27351). Therefore, as shown in FIG. 17, the third reference signal rp3 recorded on the disk 12 every rotation period is recorded so that the recording start position of each track is aligned in the direction of the center of the circle, and In the in part Ll, a relatively wide section shown in the satin area A is recorded, and in the lead out part LO, a lead out signal is recorded to force the reproducing element such as the reproducing element 11 to automatically return to the standby position. Since the recording medium is used for a long time, malfunctions such as dropouts must not occur, so recording is performed over the widest area as shown in matte area B.

Furthermore, the third reference signal fP3 is applied to each of the six analog recording tracks TAI*TA2, TA3 in FIG.
,...then C+, C2.

C3, . . . are recorded over the smallest section, while each 30-track digital recording track To
+, Te3, Te3, -, Ton (where n is an integer of 4 or more), the shaded sections D+, D2,
As shown by D3, ..., Dη, the lead-in portion Ll
The recording section A is recorded at the same recording angle, for example. Recording section C+, C2.

Since the recording angles of C3, . . . are the same, the same 3
7- The reference signal fP3 of that section is reproduced during the reproduction duration, and the recording sections D1 to DT are also recorded at the same recording angle and larger than each of C+, C2, C3, . Since the reproduction reference signals fp3 are recorded at angles, the reproduction durations of the reproduction reference signals fp3 in the recording sections D1 to l)η are the same.
Moreover, it is clear that the time required is longer than that of the reference signal fP3 reproduced from each section of C+, C2, C3, . In addition, in FIG. 17, CH indicates the center hole of the disk 12.

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

FIG. 1 shows a block system diagram of an embodiment of the apparatus of the present invention. The device of the present invention generally consists of a player section 15 and an adapter section 16. In this embodiment, as described above, of a disk on which analog recording tracks and digital recording tracks are mixed and recorded, the recorded composite video signal of the analog recording track is recorded using a 525 scanning line system (for example, NT
The first disc is a 625-scanning-line system (e.g., PAL system or SECAM system).
Among existing video discs on which only analog recording tracks 38- are recorded, the third disc has a recorded composite video signal of 525 scanning lines.
, a fourth disk with a 625 scanning line system, and the applicant's Jli! -t on any of the digital audio discs (fifth disc)
) A playback device configured to perform compatible playback, which supplies the playback composite video signal to a monitor playback device using either a 525-scanning line system or a 625-line system. Here, for convenience of explanation, the monitor playback device listed in -1- is a device that should originally display an NTSC color video signal with 525 scanning lines, and a playback device that supplies a playback composite video signal to this monitor playback device. This will be explained using a device as an example.

Here, we have developed a recording and reproducing method for a rotating recording medium that allows recorded video signals from a video disc to be reproduced and displayed without any practical problems on a monitor reproducing device that displays television signals with different numbers of scanning lines. The applicant has already filed Japanese Patent Application Laid-Open No. 56-158581 (Japanese Patent Application No. 55-61998).
Disclosed by.

The rotational speed control based on the recording and reproducing method proposed by the present applicant is performed by a servo circuit of a motor 18 that rotates a turntable 17 in a player section 15 in FIG. 1, as will be described later. First, when the load switch of the key human power device 19 of the player unit 15 is operated, the switch output is input to the command processor 20 and further supplied to the microprocessor 21. Signals and judgments from external personal computers, etc. (command signals, etc. from devices with various functions are supplied, drive a display (not shown) depending on the display mode, and transfer the input to the microprocessor 21) I do things.

The microprocessor 21 generates a clock and status as described below and supplies them to the command processor 20, while also controlling the operations of various mechanisms and circuits within the player section 15, and controlling the operation of the disk from the outside using the load switch hand saw. Make it ready for insertion. The disc 22 is placed outside the player section 15 within a storage case as previously proposed by the applicant, and the storage case is inserted into the player section 15 in which the disc can be inserted. After that, when this is pulled out, the lid plate of the storage case and the disc 22 are left in the player section 15 by a predetermined machine 1 (detailed explanation is omitted), and the disc 22 is transferred to the turntable 17. be placed on top.

On the other hand, at the same time, a plurality of microswitches are installed in the front end of the player part 15 (depending on the combination of the presence or absence of the cutout), which are provided in the deep part of the player part 15.
(not shown) is turned on or off, thereby making it possible to identify the recording contents of various discs and the surface to be reproduced, as previously proposed by the present applicant in Japanese Utility Model Application No. 57-33477. Each output signal of the above-mentioned microswitch (for example, whether the disc 22 is a digital audio disc or a video disc (the disc 12 on which analog recording tracks and digital recording tracks are mixed) is also used as a video disc 41- A J disk discrimination signal (such as a J disk discrimination signal) is supplied from an input terminal 23 to a microprocessor 21 and a switch circuit 24, which will be described later. As a result, the microprocessor 21 serially outputs, for example, a 25-bit status to the pin terminal 253 of the DIN type 8-pin connector.

": The 8-pin connector shown in FIG. 2 has eight pin terminals 251 to 258 arranged as shown in FIG.
Address data of the adapter section 167J1+ is input to 51, and from the bin terminal 252, a reproduced signal @(RF multiplied signal) is output as shown in FIG. A command signal is input from a device having a judgment function.A clock signal from the microprocessor 21 is output from the bin terminal 255, and a clock signal from the microprocessor 21 is output from the bin terminal 257.
An external synchronization signal is input. Furthermore, bin terminal 258 is grounded and bin terminal 256 is not used. Note that when the player unit 1542- is connected to a personal computer or the like, the address data is output from the bin terminal 251, the playback audio signal is output from the bin terminal 256, and the bin terminal 257 is not used. This is different from the case of connecting to the adapter section 16.

The above status taken out from Microb0 Setza 21 is output serially in synchronization with the clock signal,
The signal is supplied from the bin terminal 253 to the status decoding circuit 27 via the bin terminal 263 of the DIN type 8-pin connector having bin terminals 261 to 268 as shown in FIG.

The above clock signal is outputted to the status decoding circuit 27 and the like via the bin terminals 255 and 265, respectively. The status decoding circuit 27 determines the value placed in the second bit of the input status indicating whether the disc 22 is a digital audio disc or a video disc (assuming that the disc 12 is also detected by the video disc binding f). The signals obtained are output to the switch circuits 28, 29 and the variable frequency divider 36, 39, and the video signals recorded on the disk 22, which are placed in the fourth pits 1 to 4 of the input status, are recorded in a 525-scanning-line format. The signal obtained by determining the value indicating whether the input status is the 9th bit to the 12th bit is output to the still image decoder 30.
From the information indicating the playback mode located in
It is determined whether the disc playback device is in the high-speed search mode or not, and a signal resulting from the determination is outputted as a switching signal to a switching circuit 31 to be described later.

Inside the adapter unit 16, a color subcarrier frequency (in this case, 3.579545 MHz) of a color video signal to be originally reproduced is stored in a monitor reproduction device (not shown) to which the reproduced composite video signal of this disc reproduction device is to be supplied. ), and an oscillator 32 that oscillates at a frequency equal to four times that of
An oscillator 33 that outputs the oscillation frequency of H2 is built-in.

The output 6.174MH2 signal of the oscillator 33 is supplied to the terminal A of the switch circuit 28, while the 6.174MH2 signal output from the oscillator 33 is divided into 1/39
The frequency is divided by 2 to 15.75 kHz and then supplied to terminal A of the switch circuit 29.

On the other hand, the output signal of the oscillator 32 is supplied to the frequency divider 35,
Here, the horizontal scanning frequency is divided by 1/910 to 15.73.
After being reduced to 4 kHz, it is supplied to the two terminals V of the switch circuit, while being passed through a variable frequency divider 36 to a phase comparator 37.
supplied to The oscillator 32 and the frequency divider 35 constitute a first oscillation circuit, and the oscillator 33 and the frequency divider 34 constitute a second oscillation circuit.
It constitutes an oscillation circuit.

The phase comparator 37 constitutes a well-known phase-locked loop together with a voltage controlled oscillator (VCO) 38 and a variable frequency divider 39, and the output signal of VC038 is transmitted to the variable frequency divider 39.
While the signal is supplied to the phase comparator 37 through the terminal V, it is also supplied to the terminal V of the switch circuit 28. Here, if the disk 22 is the disk 12, the switch circuit 28.2
9 is connected to the terminal V by the output signal of the status decoding circuit 27.
Since it is controlled to select the input signal of 111,
The switch circuit 28 supplies the output signal 45- of the VCO 38 to the digital signal demodulation circuit 40 as a master clock signal. 1 [At the same time, the switch circuit 29 outputs the horizontal scanning frequency 15.73 from the frequency divider 35.
A signal with a frequency equal to 4 kHz is taken out and supplied to the switching circuit 41 in the player section 15 via the bin terminals 267 and 257, respectively, as an external motor rotation synchronization signal.

Here, the above master clock signal is
For example, the frequency is selected to be 140 times the transmission frequency of the digital signal (word transmission amount: 7 seconds) reproduced from the digital recording track.

Therefore, if the disc 22 is the disc 12 (first disc) in which the NTSC color video signal is converted into a predetermined signal format and recorded at a rate of 4 fields on an analog recording track for one rotation, As mentioned above, 2940 blocks per revolution are recorded on the digital recording track at a transmission frequency of 44,056k)1z, so the frequency division ratio of the variable frequency divider 36 is set to 1 by the output of the status decoding circuit 27. In addition, the frequency division ratio of the variable frequency divider 3946- is controlled to 1/392, and J:S Vco
38 J: A signal of 6.1678 MHz is taken out and connected to the master clock signal and the [note switch circuit 28].
The signal is supplied to the digital signal demodulation circuit 110 through.

On the other hand, the disk 22 converts a composite video signal of 625 scanning lines, such as PAI or sEcAM, into a predetermined signal format and stores 4 analog recording tracks for one rotation.
Disc 12 (second
(disc), 3528 blocks per rotation are recorded on the digital recording track at a transmission frequency of 44.100 kHz, as described above.

In this embodiment, as will be described later, this second disk has a recording horizontal scanning frequency of 15,625 k)-1z, which can be played back on an NTSC standard monitor receiver without any practical problems. NTSC horizontal scanning frequency 5, which is 144/143 times that, 15.734
J reproduced at kHz: Since the rotation of the sea urchin motor 18 is controlled, the frequency is 755 rpm instead of the regular 750 rpm.
24 (= 750x (144/ 143) ) r
It will be played at pm. Therefore, the transmission frequency of the digital signal reproduced from the digital recording track of this second disk is not 44.100 kHz, but 44.
408 (=44.lx (144/143)) k
When the Hz rises, the frequency division ratio of the variable frequency divider 36 is controlled to 1/125, and the frequency division ratio of the variable frequency divider 39 is switched to 1/49392. This results in
During this second disc playback "N, the VCO 38 outputs 49392/49392/1 at a horizontal scanning frequency of 15,734 hl-1z.
125 times the frequency, that is, the above transmission frequency 44.4U
0,217 which is 140 times the frequency of lj kl-1z
The M1-1z signal is taken out and supplied to the digital signal demodulation circuit 40 through the switch circuit 28 as a master clock signal.

Next, the switching circuit 41 selects and outputs the horizontal scanning frequency [H signal] when it is input from the pin terminal 257, and outputs the horizontal scanning frequency [H] signal from the oscillator 42 only when the signal is not input. It is configured to selectively output a signal with a frequency of [H].

The input signal from the pin terminal 257 taken out from the switching circuit 41 is frequency-divided by 1/21 by the frequency divider 43 and supplied to the terminal N of the switch circuit 24, while the frequency is divided by 1/25 by the frequency divider 44. and is supplied to the terminal P of the switch circuit 24. The switching circuit 24 is controlled in switching by an input signal from the input terminal 23, so that the disk 22 is connected to the first . When it is either the third or fifth disk, it is connected to the terminal N side, and the disk 22 records a 625-scanning-line composite video signal converted into a predetermined signal format on the analog recording track. Said second. If it is one of the fourth disks, it is connected to the terminal P side. The output signal of the switch circuit 24 is supplied to the comparator 45 as a reference signal for the servo circuit of the motor 18, and here
The phase is compared with the output pulse of

On the other hand, a central portion of a gear 48 is fixed to the rotating shaft 47 of the motor 18 so as to pass therethrough. For example, 50 teeth are formed at equal angular intervals on the outer circumferential side of the gear gear 48, and a magnetic detector 46 is provided 4) at a position facing the teeth and separated by a small distance #t. As a result, when the motor 18 rotates, the turntable 17. The disk 22 placed on the turntable 17 and the gear A7 gear 48 rotate, and the teeth of the gear gear 48 move in front of the magnetic detector 46 by 1.
One pulse is picked up by the magnetic detector 46 each time the magnetic detector 46 passes, and is supplied to the comparator 45.

Here, if the disk 22 is the first disk or the third disk, one
N system with 525 scanning lines at the rate of 4 rotation source fields
Since the TSC color video signal is converted into a predetermined signal format and recorded, 1050 scanning lines are recorded on the analog recording track for one revolution, so that the pulses are detected by the magnetic detector 46. 2 for each output
One scan line will be reproduced. Therefore, when reproducing the first or third disc, the output pulse of the frequency divider 43 having a period of 21 times the horizontal scanning period (1'') taken out from the switch circuit 24 and the output pulse of the magnetic detector 46
The pulses with a period of 21H are each supplied to the comparator 45, where they are converted into an error voltage according to the phase difference between the two signals -50=, and then the motor drive amplifier (
MDA) 49 is applied to the motor 18.

On the other hand, if the disk 22 is the second disk or the fourth disk, a PA system with 625 scanning lines is applied to the analog recording track at a rate of 4 fields per revolution.
L system or SFCAM system color video signal is the first. Third
Since the signal is converted into the same predetermined signal format as the recording signal of the disk, 1250 scanning lines are recorded on the analog recording track for one revolution.
Therefore, each time one pulse is output from the magnetic detector 46, 25 scanning lines are reproduced. Therefore, when playing the second or fourth disc, the switch circuit 24
The frequency divider 44J is switched and connected to the terminal P side and taken out.
: 25H periodic pulse of RI and 2 pulses from magnetic detector 46
A pulse with a period of 5H is supplied to a comparator 45,
After being converted into an error voltage here, the motor drive amplifier 49
is applied to the motor 18 through.

As a result, the rotation of the motor 18 is controlled so that the reproduction horizontal scanning frequency of the disk 22 is the same as the signal frequency (here, 15.734 kl-1z) supplied to the frequency dividers 43 and 44, respectively. , As a result, when the disk 22 is the first disk or the third disk, the motor 18 and the disk 22 are 899.1
rpm, and on the other hand, if the disc 22 is the second disc or the fourth disc, the motor 18 and the disc 22 are rotated at a normal rotation speed of 75 rpm.
44/143 times 755, 24 rpm
It can be rotated by

Motor 18. When the turntable 17 and the disk 22 begin to rotate, and the user presses the start switch in the key manual device 19, the feed mechanism 50 is moved toward the inner circumference of the disk 22 via the command processor 20 and microprocessor 21, respectively. After that, the scanning side 51 slides 1! on the disk 22. be shunned. Since the disk 22 has an electrode function and an electrode is formed on the scanning side 51, the disk 22 and the scanning! An iWI capacitor is formed between the electrode at t51,
It changes in response to changes in the geometry of the recording rack, and this change is converted into an electrical signal by the pickup circuit 52 in a known manner.

The reproduction signal (RF
The doubled signal is supplied to a well-known tracking servo circuit 53, where it is supplied with the reference signal rp+ described above.

After fρ2 is discriminated and separated, envelope detection is performed, and the detection outputs are differentially amplified and converted into tracking error signals. This tracking error signal is applied to the tracking coil 54, and the scanning! 5 on the scanning side so that I51 always scans on the information signal recording track without a 1-rack deviation
The needle tip of No. 1 is momentarily and minutely displaced in the track width direction.

Further, the reproduction signal taken out from the pickup circuit 52 is supplied to the information signal reproduction circuit 55, where the second FM signal reproduced from the analog recording track is FM demodulated, and then a composite video image conforming to the NTSC system is provided. After being reproduced into signals and audio signals, the reproduced composite video signal is outputted to the output terminal 53-, and the reproduced audio signals of the two channels are outputted to the output terminals 57-58.
Output to. The reproduced video signal from the output terminal 56J and the two-channel audio signal from the output terminals 57 and 58 are supplied to the switching circuit 31 via the input terminals 59 and 60.61 of the adapter section 16.

Here, the information signal reproducing circuit 55 performs a high-speed search on a disc on which digital recording tracks and analog recording tracks 1 to 1 are mixed (the first and second discs). Depending on the signal from the microprocessor 21 indicating whether the transport direction is the forward direction (for example, the inner circumferential direction) or the reverse direction (for example, the outer circumferential direction), the reproduced audio of one of the rear channels of the two channels is determined as to the reproduced audio signal. It is configured to selectively output only signals.

Further, the switching circuit 31 is connected to the first switching circuit 31. The configuration is such that the output signal of the information signal reproducing circuit 55 is selectively output during a high-speed search of the second disk, and the output signal of the still image decoder 30 and the DA conversion and switching device 62 is selectively output during normal reproduction.

Furthermore, the reproduced signal 54- taken out from the pickup circuit 52 is supplied to the FM demodulation circuit 63 in the adapter section 16 via pin terminals 252 and 262, respectively, where the FM
After being decoded and 111, the vertical synchronization signal detection circuit 64, address data acquisition circuit 65 and digital signal demodulation circuit 4
0 respectively. The digital signal demodulation circuit 40 is supplied with the master clock signal taken out from the switch circuit 28 as described above, and detects errors in the demodulated digital signal of signal formats 1 to 1 as shown in FIG. 8 reproduced from the digital recording track. The detection code CRC is used to detect the presence or absence of an error, and if there is an error code, the error correction codes P and Q are used to restore the original correct code. The digital audio signal placed at the position shown in FIG. 15 or the digital information signal shown in FIG. When a digital video signal is to be transmitted, the digital video signal is directly supplied to the image data reader 30. The DA conversion and switching device 62 performs digital-to-analog conversion of digital information signals such as digital audio signals, and is then controlled by a switching circuit to switch based on the output of the address data acquisition circuit 66.
While outputting the output signal to the output terminals 67 to 70,
In the case of the 2-channel V-channel digital information signal shown in FIG. 15, it is output to the switching circuit 31.

The still picture decoder 30 generates a desired standard television format analog video signal of the original still picture from the input digital video signal and outputs it to the output terminal 71 and to the switching circuit 31 . In addition, the still image decoder 30 determines whether the disk 22 is the disk 12 according to the control signal from the status decoding circuit 27, and
Even if the analog recording track contains a composite video signal with a 625-scanning line system, the number of scanning lines is not converted to a 525-scanning system, and a two-channel digital video signal is converted into two still images. If so, select the still image of any - channel and demodulate it. The above scanning line number conversion is performed in the case of a digital audio disc (the fifth disc) because it has all digital recording tracks, but in the case of disc 12, there are both analog recording tracks and digital recording tracks. Since scanning line number conversion is not performed on the 625 scanning line composite video signal reproduced from the analog recording track, only the digital video signal is scanned by the scanning line number conversion circuit in the still image decoder 30. When line number conversion is performed, the phase of the reproduced vertical synchronizing signal differs between when reproducing an analog recording track and when reproducing a digital recording track, and the quality of the reproduced screen deteriorates, such as when the vertical synchronizing signal appears on the screen. Therefore, when reproducing the disc 12, no conversion of the number of scanning lines is performed. On the other hand, the address data fetching circuit 66 accumulates the incoming signals one bit per block to obtain a control signal in a signal format not shown in FIG. 9, and then fetches the data. The data captured by the address data capture circuit 66 is supplied to the terminal of the switch circuit 72, and is also supplied to the DA conversion and switching device 57-62, where it is applied to a switching signal generated based on the data. The output terminals 67 to 7 of each of the four channels pass only the audio signal transmission channel.
0 to two or more predetermined output terminals.

The address data acquisition circuit 65 discriminates and separates the address signals in the reproduced signals reproduced from the analog recordings 1 to 6, acquires the reproduced address data, and further supplies the acquired address data to the terminal AN of the switch circuit 72. .

Further, the discrimination circuit 73 is supplied with a vertical synchronization signal detection signal from the vertical synchronization signal detection circuit 64 and a signal indicating the test result by the error check code CRC from the digital signal demodulation circuit 40, During the period in which the signal indicating that the test result is correct is received, it is determined that the digital recording 1-rack is being played back, and the switch circuit 72 is connected to the terminal side. During the period when the detection signal is received and the signal indicating that the test result is incorrect is received, it is determined that the analog recording track is being reproduced and the switch circuit 72 is connected to the terminal ΔN. Switch the connection to the side.

As a result, the output address data of the address data acquisition circuit 65 is taken out from the switch circuit 72 when reproducing an analog recording track, and on the other hand, the output address data of the address data acquisition circuit 66 is taken out when reproducing a digital recording track. . This playback address data is supplied to the command processor 20 and microprocessor 21 in the player section 15 via the bin terminals 261 and 251, respectively. Command Pro Retsuza 20 has a scanning needle 51
The microprocessor 21 outputs various signals generated based on the desired signal from the key input device 19 and the input address data to the feed mechanism 50, while displaying the reproduction position of the playback position sequentially using the specified address data.

The disk of the disk playback device with the above configuration? The operation during high-speed search in No. 12 will be described next.

When a high-speed search in the forward or reverse direction is instructed by the key manual device 19, a control signal from the microprocessor 21 causes the tracking servo circuit 53 to control the tracking coil 54 during the scanning period of the six analog recording tracks TA. stops the sending of kick pulses, and during the scanning period of the next 30 digital recording tracks T o, sends out the number of kick pulses to forcibly change the reproduction track on the scanning side 51 at a speed ratio of 60 times. . Here, MicroProcera+J21 is supplied with the playback reference signal fP3 to the fP3 detector located in the tracking servo circuit 53, and judges the playback duration here, and based on the judgment result, it is digitalized. Record 1~
It is determined whether the track is a rack TD or an analog recording track TA, and the above kick pulse is selected and output.

As a result, as shown in FIG. 3, during a high-speed search, the 6 analog recording tracks TA are played back normally, and the 30 digital recording tracks To are played back at high speed at a speed ratio of 60x. The scanning side 51 is transported toward the inner circumference or outer circumference of the disk.

On the other hand, as mentioned above, during high-speed search [, 1 switching circuit 3
1 is controlled to selectively output only the output signal of the information signal reproducing circuit 55, the reproduced composite video signal outputted from the switching circuit 31 to the output terminal 74 is as shown in FIG. 4(A).
As schematically shown in , the normally reproduced composite video signal from the analog recording track TA is extracted for a 6-track scanning period of 0.4 seconds (-6X (1/15) seconds) as shown by VP, and then the digital signal immediately after that is extracted. Scanning period of recording track TD: 0.033 seconds (=30x (1/15)
1/60) ), the high-speed reproduction still image of the digital recording track is muted and not output as shown by VM.

In addition, during a high-speed search, the information signal reproducing circuit 55 outputs the reproduced audio signal of the first channel only to the output terminal 57 during a forward search, and outputs the reproduced audio signal of the first channel to the output terminal during a reverse search. The reproduced audio signal of the second channel is output only to 58. Therefore, the reproduced audio signal output from the switching circuit 31 to the output terminal 75 is as shown in FIG. 4(B) during forward search.
The reproduced audio signal of the first channel normally reproduced from the analog recording track TA indicated by 61-VIP is extracted for 0.4 seconds, and the next 0.033 seconds are muted as indicated by AIM, which is alternately repeated. It will be done. On the other hand, when searching in the reverse direction, normal reproduction is performed from the analog recording track TA as schematically shown by A2P in FIG.
Since the audio signal of the channel has been recorded in advance according to this scanning trajectory, the reproduced audio signal of the second channel is extracted for 0.4 seconds, and the next 0.033 seconds are muted as shown between A2. The muting period of 0.033 seconds between AIM and A2 is a 60x playback period of the digital recording track To.

In this way, during high-speed search, a normal playback image and normal playback audio indicating the information content of the next digital recording track are displayed and sounded for 0.4 seconds, and the next 0.4 seconds are displayed and the normal playback audio is output.
Since the image and audio are alternately muted for 0.33 seconds, a desired digital recording track can be searched for in a short time while monitoring the reproduced image and audio.

Next, the operation during normal playback will be explained. At this time, the tracking servo circuit 53 operates to control the tracking coil 54 during the analog recording track TA scanning period.
It outputs the necessary number of kick pulses to move the scanning needle 54 in the forward direction at double speed from 0 times speed, and also outputs the kick pulses necessary for moving the scanning needle 54 in the forward direction at double speed, and also on the digital recording track T.

During the scanning period, the sending of kick pulses is stopped and the scanning side 51
Playback] ~ Pause the forced change operation of the rack. In this case, on the scanning side 51, as shown in FIG. 5, the six analog recording tracks TA are scanned at a speed of 60 times,
The digital recording track TI) of the track alternately repeats normal reproduction.

Further, during normal reproduction, the switching circuit 31 selectively outputs each output signal of the still IL image decoder 30 and the DA conversion and switching device 62, and blocks the passage of the output signal of the information signal reproduction circuit +55. Therefore, during normal reproduction, the recorded information signal on the analog recording track is not reproduced and output, but is ignored. Here, the still images recorded in the 11th, 2nd, and +1st digital recording tracks during normal playback are P K , respectively, as shown in FIG. 6 (△).
-1.

When PK and PK++ are added, the memory circuit in the still image decoder 30 outputs the data immediately before the 6 analog recording tracks and the next 30 digital recording tracks during the scanning period, as schematically shown in FIG. Since the still images PK-1 and PK reproduced from the digital recording track continue to be reproduced, the reproduced still images are successively reproduced for a certain period of time and switched without being lost. Similarly, l)
Among the compressed audio signals or control program signals taken out from the A conversion and switching device 62, if the compressed audio signal is an audio signal that has been compressed on the time axis and expanded to the original time axis, the audio will be output without interruption. The signal is played. If you want to view a still image of a desired digital record 1 to 3 for a desired period of time, this can of course be done by issuing a command from the key manual device 19 such as making the scanning side 51 non-contact with the disk 22 when reproducing the desired still image. It is.

Note that when the disc 22 is a conventional digital audio disc (fifth disc), the switch circuits 28 and 29 are switched to the terminal A side by the output signal of the status decoding circuit 27, and the switch circuit 28 outputs the output signal of the oscillator 33. An output signal of 6.174 MHz is taken out and supplied to the digital signal demodulation circuit 40 as a master clock signal, and an output 15.75kl-1z signal of the frequency divider 34 is taken out from the switch circuit 29 and sent to the bin terminal 267°257. , and are supplied to frequency dividers 43 and 44 as motor rotation synchronization signals via switching circuits 41, respectively.

Here, when playing the fifth disc, the switch circuit 24 is switched to the terminal N side, and the frequency divider 43
The 75011z signal frequency-divided by /21 is supplied to the comparator 45. This causes the motor 18 to rotate at 900 rpm. Further, the switch circuit 72 is always connected to the terminal side when the fifth disk is being played back, and is always connected to the terminal AN side when playing the video disk (the second and fourth disks).

65- Note that the present invention is not limited to the above-described embodiments, and various other applications and modifications are possible. For example, during high-speed search, the analog recording track TA
Although it has been explained that only the analog recording track TA is played back in the forward or reverse direction at the normal playback speed, the analog recording track TA may be played back in stop motion for a certain period of time (
In this case, the reproduced audio signal from the analog recording track is muted), in short, the scanning needle 51 may be moved at a speed ratio equal to or lower than that during normal reproduction. Further, the unit 1 to the number of racks of the digital recording track TD is determined by the reference signal r.
This is because, once the length of the playback duration of p. At double speed, digital recording track To.

Since the 30 tracks are scanned in about half a rotation of the disk, the reference signal tρ3 can only be reproduced from the first track out of the 30 tracks), so it needs to be constant. Since the track TA does not need to be constant, the number of unit recording tracks may be changed on the same disk as necessary.

In addition, in the above embodiment, four types of disks (the first to fourth disks) on which at least the analog recording tracks described above are recorded are displayed on a monitor television receiver with a 525 scanning line system. We have described a playback device that controls the rotation of the disc so that the horizontal scanning frequency is 15,734 kHz, so that it can be displayed on a 625-line monitor television receiver. Of course, the present invention can also be applied to a playback device that controls the rotation of a disk. However, in that case, the circuit consisting of the oscillator 32 and the frequency divider 35
．． It generates a signal with a frequency equal to the horizontal scanning frequency of 625 kHz, and the oscillation frequency of the oscillator 42 is also 15.
．． It is necessary to change it to 625 kHz.

The number of revolutions of the motor 18 (disk 22), the transmission frequency of the digital signal (block) reproduced from the digital recording track, the master clock frequency, and the variable frequency division when the first to fifth disks are reproduced by this reproduction device. The frequency division ratio of the circuit 39 is summarized as shown in the following table.

As can be seen from the table above, the master clock frequency is equal to 140 times the transmission frequency. However, in the device of the present invention, the master clock frequency does not need to be 140 times the transmission frequency, and may be any other real number multiple. In the above table, ■ to ■ indicate the first to fifth disks. Further, the frequency division ratio of the variable frequency divider 36 is switched to "1" when the first disc is reproduced, and to "1/125J" when the second disc is reproduced.

Further, the present invention is capable of reproducing a disc in which composite video signals of N fields (N is a natural number of 2 or more) are recorded in the analog recording 1-rack for one rotation of the disc, and the above-mentioned 4. It is not limited to fields.

Furthermore, in the above embodiment, the adapter section 16 is connected to the player section 1.
Although the adapter section 16 is provided separately from the player section 5, it is also possible to incorporate the adapter section 16 into the player section 15.

Effects of the Invention As described above, according to the present invention, the content of a recorded still image on a digital recording track can be identified by the reproduction information signal of an analog recording track, so that it is possible to identify a recorded still image on a desired digital recording track during a high-speed search. The contents of still images can be searched by monitoring at least the playback screen, and there is no time delay for TN recognition of the search results, and furthermore, the contents of still images can be searched by monitoring at least the playback screen, and there is no time delay for TN recognition of the search results. It is possible to suitably and compatiblely reproduce information signals even from the computer, and furthermore, it is possible to continuously reproduce digital information (especially still images) on digital recording tracks without missing reproduction information even during normal reproduction. It has the following features.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the device of the present invention;
Figure 2 shows an example of a DIN type 8-bin connector, Figure 3
The figure shows an example of the relationship between playback time and playback track during high-speed search, Figure 4 is a diagram explaining the output state of the playback signal during high-speed search, and Figure 5 shows the playback time and playback during normal playback. FIG. 6 is a diagram showing an example of the relationship with the track, FIG. 6 is a diagram for explaining reproduced still images during normal reproduction, and FIG. 7 is an example of a recording system for obtaining an information signal recording disk to be reproduced by the apparatus of the present invention. FIG. 8 is a diagram showing an example of the signal format of one block of digital signals recorded on the digital recording track, and FIG. 9 is a diagram showing an example of the signal format of each address code recorded on the digital recording track. 10 is a diagram showing an example of the signal format of a digital video signal recorded on a digital recording track, and FIG. 11 is a diagram showing an example of the signal format of a digital video signal recorded on a digital recording track.
〇--A diagram showing an example of signal format 1- showing the main parts of the mat in more detail, FIG. 12 is a diagram showing an example of the frequency spectrum of a frequency-modulated wave signal and a reference signal recorded on a digital recording track. , FIG. 13 is a diagram showing an example of the frequency spectrum of the frequency modulated wave signal and the reference signal recorded on the analog recording track, and FIG. 14 is a diagram showing an example of the track pattern of the disc to be reproduced by the reproducing apparatus of the present invention. FIG. 15 is a diagram schematically showing an example of the recorded information content and unit track number of digital recording tracks and analog recordings 1 to 4 of a disc to be reproduced by the reproducing apparatus of the present invention,
FIG. 16 is a diagram showing an example of a scanning locus during reverse direction reproduction, and FIG. 17 is a diagram showing an example of the recording section of the third reference signal fP3 of the disc to be reproduced. 3.4... PCM recording/reproducing machine, 6... Digital signal processing circuit, 10... Analog signal processing circuit, 12°' 22... Information signal recording disk (disc), 13.
... Reference signal input terminal, 15... Player section, 16.
...Adapter part, 20...Command processor, 2
1...Microprocessor, 27...Status decoding circuit, 28.29.72...Switch circuit, 30.
...Still image decoder, 31...Switching circuit, 32, 33
．． 42... Oscillator, 34, 35, 43. /44...
・Frequency divider, 36° 39... Variable frequency divider, 38... Voltage controlled oscillator (VCO), 40... Digital signal demodulation circuit, 46... Magnetic detector, 48... Gear gear ,
51...Scanning side, 52...Pickup circuit, 53
...Tracking servo circuit, 54...Tracking coil, 55...Information signal reproducing circuit, 62...D
A conversion and switching device, 63...FM demodulation circuit, 64.
. . . Vertical synchronization signal detection circuit, 65. 66 . . . Address data acquisition circuit, 73 . . . Discrimination circuit, 74 . Ku no i 470-1 trace] Nigi F

Claims (1)

[Scope of Claims] (1) A playback device that uses a playback element to pick up and play back recorded signals on an information signal recording disk on which information signals are recorded on concentric or spiral tracks, which mainly consists of a plurality of still images. At least a synchronization signal, an error correction code, and an error check code are added to multiple channels of digital data obtained by digital modulation with an information signal to form one block, and the digital signals synthesized in time series for each block are further A digital recording track in which a first modulated wave signal obtained by modulation is recorded, and the digital recording 1
- an analog information signal that is recorded immediately before the recording track portion of each of the plurality of still images of the rack and includes at least a composite video signal related to an image indicating the content of the still image of the digital recording track that is recorded immediately thereafter; Analog recording in which a second modulated wave signal obtained by analog modulation is recorded] - Reproduction obtained by picking up and reproducing already recorded signals of the information signal recording disk formed with racks using the reproducing element. A first reproducing circuit regenerates the reproduced signal from the analog recording track among the signals into a composite video signal having a predetermined television system horizontal scanning frequency, and the reproducing element picks up and reproduces the obtained signal. a second reproduction circuit that demodulates and reproduces the reproduction signal from the digital recording track among the reproduction signals into the original information signal;
An oscillation circuit that generates a frequency that is a natural number multiple of the horizontal scanning frequency of the - television system, and an output signal of the oscillation circuit is supplied as a motor rotation synchronization signal to cause the motor for rotating the information signal recording disk to rotate. a revo circuit that rotates in synchronization with a synchronization signal; a master clock signal generation circuit that supplies a signal obtained by frequency-multiplying the output signal of the oscillation circuit to the second reproduction circuit as a master clock signal; and at least a high-speed search. At the time, the reproducing element is transported at high speed so as to scan at a speed ratio of about 100 times or more during the digital recording track scanning period, and
a reproducing element transfer control means for transporting the reproducing element at a low speed so as to scan the reproducing element during the analog recording track scanning period at a speed ratio lower than that during normal reproduction; and a reproducing element transport control means for transporting the reproducing element during the high speed search During the digital recording 1 to easy playback period, the output demodulated information signal of the second playback circuit is muted, and during the playback period of the analog recording track of the playback element, the output composite signal of the first playback circuit is muted. An information signal recording disk reproducing device comprising switching circuit means for selectively outputting a video signal. (2) Two channels of audio signals are recorded in the analog recording track together with the composite video signal, and the switching circuit means performs the reproduction during the analog recording track reproduction period of the reproduction element during the high-speed search. When the element is reproducing in the forward direction, the first reproducing circuit selects and outputs the demodulated signal of the audio signal of the first channel together with the composite video signal, and when the reproducing element is reproducing in the reverse direction, the demodulated signal of the audio signal of the first channel is selectively outputted. The information signal recording disk reproducing apparatus according to claim 1, wherein is circuit means for selectively outputting the demodulated signal of the audio signal of the second channel together with the composite video signal from the first reproducing circuit. (3) During normal playback, the playback element transfer control means moves the playback element during the digital recording track scanning period at a double speed ratio during normal playback, and moves the playback element during the analog recording track scanning period at a double speed ratio during normal playback. According to claim 1, the switching circuit means selectively outputs only the output demodulated information signal of the second reproducing circuit during normal reproduction. The information signal recording disk reproducing device as described in 2.