JPS6168773A - Information signal recording and reproducing device - Google Patents

Abstract

PURPOSE:To attain interchangeable reproduction of a digital signal with high quality at a required transmission frequency by controlling a reproducing rotating speed in response to a sampling frequency of the digital signal recorded compositely with an analog signal. CONSTITUTION:Disc information of different sampling frequency depending on the scanning line number fed from a terminal 23 of a player section 15 is discriminated by a microprocessor 21 and a switch 24 is changed over by disc information. A variable frequency divider 39 of an adaptor section 16 is controlled depending on the discriminated output of the processor 21, a clock in response to disc information is generated from a voltage controlled oscillator 38 and a digital signal demodulation circuit 40 is controlled. On the other hand, a frequency division output of a frequency divider 43 or 44 is applied via the switch 24 as a speed control reference signal, the disc rotating speed is controlled selectively via a motor 18 in response to the information form and the digital signal is reproduced with high quality at a required transmission frequency.

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 of an analog signal mainly consisting of a composite video signal and a recording track of a digital signal consisting of audio information and still image information. The present invention relates to a reproducing apparatus for reproducing recorded information signals from an information signal recording disc on which recording tracks are recorded and formed in a mixed manner on the same surface.

2. Description of the Related Art Conventionally, information signal recording disks (in which analog information signals such as composite video signals and audio signals are subjected to frequency modulation (FIVI) and recorded on concentric or spiral tracks as, for example, changes in geometric shapes) have been used. (hereinafter 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 performing analog modulation, in which a carrier wave is modulated with an analog information signal. Composite video signals, etc. are recorded. In addition,
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, but the recorded information is Since the main component is only analog modulated composite video signals, etc.
Hereinafter, for convenience, a track such as the recording track of this video disc will be referred to as an "analog recording track".
It shall be as follows.

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.

By the way, as proposed by the present applicant, the above-mentioned video disc is capable of reproducing previously recorded signals by detecting changes in capacitance formed between the electrode of the scanning needle and the disc, and of reproducing information signals. 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, eliminating the need for a needle guide groove. Video discs made with this technology are known. On the other hand, in the digital audio disc described above, as proposed by the applicant, the reference signal for tracking control is transferred to the information signal recording track (digital recording track) in the same way as the capacitance change reading type video disc described above. It is known that there are capacitance change readable digital audio discs without needle guide grooves that are recorded on both sides of the disc. This digital audio disc is rotated at the same number of rotations as the above-mentioned capacitance change reading type video disc, the frequency of the reference signal for tracking control and the method of reproduction are the same, and furthermore, the frequency of the reference signal for tracking control and the method of reproduction are the same. The previously recorded signal is detected by detecting the change.
The structure to be read is also the same. Therefore, even when this digital audio disc is played back by a video disc playback device, the scanning needle is caused to perform a normal tracking operation in the same way as when playing a video disc, and the previously recorded signal can be picked up and played back from the scanning needle. By supplying the reproduced signal to the adapter, the original audio signal etc. can be demodulated.

Therefore, both the capacitance change reading type video disc and the capacitance change reading type digital audio disc proposed by the present applicant 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 compatible manner.

However, the above-mentioned digital audio disc and video disc are separate and independent discs, and the above-mentioned compatibility cannot be said to be compatibility in a strict sense. On the other hand, compared to video discs, the recorded signals on digital audio discs are digital signals, and due to the characteristics of digital signal transmission, audio signals can be reproduced with extremely high fidelity over a wide dynamic range, and still images can also be extremely clear. , and of course has the advantage that the audio signal is reproduced in ultra-high fidelity together with the still image reproduction image. On the other hand, when playing still images, video discs generally mute the audio signal in order to repeatedly play the same track, and unlike digital audio discs, still images and sound cannot be played at the same time. , since it is an analog signal transmission,
It is possible to transmit information signals in a band of about several MH7 in real time, and compared to digital audio discs, which transmit information signals in a band of about several tens of kilohertz to increase the accuracy of information, it is possible to transmit video with audio. It has the advantage that it can be played back along with the signal. 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 applicant previously disclosed in Japanese Patent Application No. 58-83233 etc. that the above-mentioned method can be achieved by reproducing a disc recorded with a mixture of analog recording tracks and digital recording tracks according to the recorded information contents. We have proposed a disc playback device that can maximize the respective advantages of video discs and digital audio discs, and can play them completely interchangeably.

Problems to be Solved by the Invention However, the disc to be played by the disc playback device proposed above is a video disc recording a composite video signal of the same television system as the composite video signal recorded on the analog recording track. A digital recording track of a first type of disk that is rotated at the same number of rotations to read and reproduce the recorded edge information signal, but in which a composite video signal of 625 scanning lines is recorded on the analog signal recording track. In contrast, 3528 blocks per revolution are recorded at the same transmission frequency of 44.100 kHz as digital audio discs, whereas the second disc records a composite video signal with 525 scanning lines. 2940 blocks per revolution were recorded on the digital recording track of the disc of this system at a transmission frequency of 44,056 kHz.

That is, each of the above transmission frequencies is the reciprocal of the transmission period of one block of the same signal format, but the transmission frequency of the recorded edge digital signal of the disc of the second system is different from that of the digital audio disc and the disc of the first system. 44.100 which is the transmission frequency of the edge digital signal
Since it was 44.056 kHz, which is lower than kHz, the sampling frequency of the digital signal was also 44,056 kHz.
7, which is slightly disadvantageous in terms of dynamic range,
Another problem is that it is disadvantageous in terms of compatible playback with digital audio discs.

Therefore, the present invention solves the above-mentioned problem by switching to a higher rotational speed than when reproducing an analog recording track and reproducing the digital signal at a required transmission frequency when reproducing the digital recording track of the disk of the second method. It is an object of the present invention to provide a reproducing device for an information signal recording disk that solves the problem.

Means for Solving the Problems The information signal recording disk reproducing apparatus according to the present invention picks up already recorded signals on an information signal recording disk in which analog recording tracks and digital recording tracks are mixedly recorded on the same disk surface. a reproduction means for reproducing a first information signal and a first information signal for reproducing a second information signal from a reproduction signal from the reproduction means; It consists of a second reproduction circuit, a master clock signal generation circuit, reproduction track position detection means, and servo circuit means.

In the information signal recording disk, a modulated wave signal obtained by analog modulation with a first information signal containing at least a composite video signal of a television system is recorded on the analog recording track, and a second information signal is recorded on the analog recording track. One block of signals including at least digital data obtained by digital modulation with an information signal is synthesized in time series in block units at a predetermined transmission frequency different from that of the digital audio disk and recorded on the digital recording track. .

The master clock signal generation circuit supplies a master clock signal of a constant frequency to the second reproduction circuit, and the reproduction track position detection means generates a synchronization signal separated from the first information signal reproduced by the first regeneration circuit. signal and said second
From the error check signal extracted from a part of the regeneration circuit of
Detect the playback track position during playback. The servo circuit means also controls the analog recording track so that the reproduction block signal is reproduced at the same transmission frequency as the digital audio disc during the digital recording track reproduction period based on the output signal of the reproduction track position detection means. The rotation of the disk rotation motor is controlled by switching to a rotation speed different from that during the reproduction period.

The rotation of the information signal recording circle m<disk) is controlled by the servo circuit means so that the recorded signal of the digital recording track is reproduced at the same transmission frequency as the recorded signal of the existing digital audio disk, and The recording signal of the analog recording track is rotated at the same rotation speed as the existing video disc. Hereinafter, the present invention will be described in detail together with examples.

Embodiment An embodiment of a disc reproducing apparatus according to the present invention is shown in FIG. 1. Before explaining this embodiment, a disc to be reproduced will first be briefly described. FIG. 2 shows a block system diagram of an example of a disk recording system. This recording system has approximately the same configuration as the recording system for an information signal recording disk that the present applicant previously proposed in Japanese Patent Application No. 83232/1982, but the sampling frequency of the digital audio signal and the transmission frequency of the block signal are For example, 44.100 kH2
The difference is that In Figure 2, NTSC, which will be described later,
system color video signal (this is a composite video signal) and 2
The audio signals of each channel are converted into predetermined signal formats and recorded, while the digital audio signals and digital video signals are synthesized in a time-series manner for a total of four channels and recorded on the digital recording track. shall be taken as a thing.

VTR1 and 2 are two-channel VTRs, respectively.
1 has a sampling frequency of 44.1 for the audio signals of 2 channels.
00 kHz PCM modulation (pulse code modulation) separately
For example, a signal consisting of digital data with 16 quantized bits per sample point, an error check code, and an error correction code is inserted into the composite synchronization signal as a video period signal of a composite video signal based on the NTSC system. A frequency-modulated signal is prerecorded on an inclined track of a magnetic tape. On the other hand, in the VTR 2, for example, two channels of still image signals are frequency modulated and recorded in advance. For example, the above still image signal is a three-primary color signal related to a still image imaged by a 525-scanning-line television camera, which is converted into a luminance signal and two types of color difference signals by a matrix circuit, and these three types of signals are then separately processed. After obtaining pixel data with, for example, 8 quantization pits per sample point, the pixel data is rearranged in a predetermined order using a memory circuit, and a predetermined header signal is added to the component data. The signal format is such that the encoded data is sequentially inserted in each video period as a video period signal in a composite video signal conforming to the NTSC system along with a separately generated error check code and error correction code.

The VTRs 1 and 2 are supplied with a synchronizing signal from the PCM recording and reproducing units 3 and 4, respectively, and the PCM recording and reproducing unit a3.4 receives the NTSC horizontal scanning frequency of 15.734 from the oscillator 5.
A kHz synchronization signal is supplied, and both have a frequency of 15,734 kHz.
It operates in synchronization with kHz. 2 each of VTR1 and 2
The reproduced signals of the channels are separately supplied to the PCM recording/reproducing machines 3 and 4, where they are frequency demodulated and then encoded into reproduced digital data and reproduced components of the video period using the reproduced error check code and error correction code. After data errors are corrected, the digital data and component encoded data are supplied to the digital signal processing circuit 6.

Here, for example, VTRs 1 and 2 have one horizontal scanning period (
Since 6 information words (3 words each for both left and right channels) are recorded in 1H) and a data pause period of 35H is provided in 1 frame, the sampling frequency of the reproduced signal is 3x b + x (525-35 ) 1525, and the output synchronization signal frequency of the oscillator 5 [H is +5.734
Since it is kHz, the sampling frequency is 44,0 from the above formula.
It becomes 56 kHz. In addition, one information word is 16
It's bit. In this way, the PCM recording/reproducing device 3 outputs a sampling frequency of 7144 with a quantization bit number of 16 bits,
A 2-channel digital audio signal of 100 kHz has a quantization bit count of 16 bits and a sampling frequency of 44 bits.
．． 056 kHz, and from the PCM recording/reproducing device 4, two channels of pixel data with a hanging bit number of 8 bits are extracted at a sampling frequency of 88,112 kHz)-1.
It is taken out at z.

Under the control of the output of the controller 7, the digital signal processing circuit 6 generates one block of signals in the signal format shown in FIG.
The synthesized digital signal is synthesized in time series at a transmission frequency of 56K H2, and then a carrier wave of, for example, about 7MH2 is frequency modulated (FM).

The frequency modulated wave signal obtained in
Output to. FIG. 5 is an example of the frequency spectrum of the frequency modulated wave signal (first FM signal) supplied from the digital signal processing circuit 6 to the terminal 8a of the switch circuit 8.
When the carrier wave data is "1", it is 7.6 MH7, and when the data is rOJ, it is 5.8 MHz. In addition, in the same figure,
rp + , fp 2 and U fp shown by broken lines
31 LI Description aH The reference signal recorded together with the first FM signal in the position 11 [ρIt shows each frequency spectrum of fp2 and fp3.

Here, in one block of signals shown in FIG. 3, S indicates the arrangement position of an 8-bit fixed pattern synchronization signal indicating the start of the block. Ch-1゜Ch-2, Ch-3
and Ch-4 are 16-bit digital signals for each of the four channels (i.e., the digital audio signal and component encoded data).
This shows the placement position of one word.

Furthermore, P and Q shown in FIG. 3 are each 16-bit error correction codes. Furthermore, CRC is a 23-bit error detection code.
ch-1 to ch-4, P, Q arranged in the same block
It is the 23-bit remainder obtained when each word of is divided by the generator polynomial x23 + X5 + X4 +
It is used to divide the signal up to the th bit by the above-mentioned generator polynomial, and when the resulting remainder is zero, it is detected that there is no error. Furthermore, in FIG. 3, 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, all bits of the control signal are transmitted by 196 blocks (that is, the control signal is composed of 196 bits).

Furthermore, U is two reserved bits called user's bits. One block of signals is composed of a total of 130 bits from S to U shown in Figure 3, and the digital signal is 44.056 kHz per block.
are synthesized at frequencies and transmitted in chronological order.

The above 196-bit control signal has a configuration in which four types of address codes of 49 bits each are synthesized in chronological order.
All of these four types of address codes have a signal format as shown in FIG. In Figure 4, all 4
The first 24 bits of the 9-bit address code, indicated by 5YNC, 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 in which the recording signal shows the above combination,
It also includes a normal/stop mode discrimination signal indicating whether or not to perform stop playback, address data is arranged in the next 20 bits, and the last 1 bit is a parity pit.

If the above address data is a time address code, it is time data that indicates how long the track position on the disc where the code is recorded is during normal playback from the recording start position on the disc. In the case of a chapter address code, this data indicates the number of the music program recorded from the recording start position on the disc at the track position where the code is recorded.

As will be described later, the composite video signal is converted into a predetermined signal format and recorded on the analog recording track of the disc at a rate of 4 fields per revolution, so the number of rotations during playback of the disc depends on the composite video signal. 89 for NTSC system
9.1 (= (59,94/4)x60) rp
750 for PAL or SECAM format
(= (50/4) x 60) rpm. Therefore, the digital recording track for one revolution of the disc has 2940 (= 44.056 x 103 x (4
/ 59.94 )) blocks are reproduced, and the above 196-bit control signal is reproduced 15 times in a rotation period of 291 disks, while the number of blocks to be reproduced at a rotation speed of 750 rpm is 3528 (= 44 .100
x 103 x (4/50)) blocks are reproduced, and the above control signal is reproduced 18 times in the D291 rotation period.

Note that among component encoded data regarding still images, for example, pixel data of a luminance signal has a sampling frequency of 9 MH.
z, 8-bit quantization per pixel is transmitted at a sampling frequency of 88,112 kHz, and the pixel data of the two color difference signals (RY) and (B-Y) are sampled, respectively. The sampling frequency is 2.25 Ml-1z, and the sampling frequency of 8 bits per pixel is 88.112.
Transmitted at kH2.

Here, the number of pixels in the horizontal direction of the luminance signal of the 525 scanning line method is 572, which is approximately equal to the value obtained by dividing the sampling frequency 9Ml-1z by the horizontal scanning frequency 15.734 kHz. For example, 4 pixels excluding pixels in each vertical blanking period and pixels for overscanning.
Only 56 pixels are transmitted.

In addition, each sampling frequency of the two types of color difference signals is 1 of the luminance signal.
/4 of 2.25MHz, 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 kHz, but as above, for example, 456 pixels are transmitted. Ru.

On the other hand, the number of pixels in the vertical direction (effective number of scanning lines) is 5 scanning lines.
For example, 478 vA is selected for the 25-wire system, and 572 vA for the 625-wire system. 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.

One word is 16 bits, and each pixel data with a quantization bit count of 8 bits is placed in the upper 8 bits and lower 8 bits of one word, so two pixel data are transmitted in one word. Become.

Furthermore, as mentioned above, when transmitting data that is digitally modulated by the NTSC color video signal, the digital video signal for one frame is 456 pixels in the horizontal direction for the luminance signal.
It consists of @ pixel and 478 pixels in the vertical direction, and if it is transmitted for each pixel in the vertical direction, each pixel is 239 (=
There are 456 pixel data groups of digital luminance signals of 478/2') words, 114 each of two types of digital color difference signals of 239 words, and each pixel data group arranged at the initial position of each pixel data group. A total of 167.684 header signals of 6 words are synthesized in time series.
It is a 580 word digital signal. Note that the header signal is transmitted as a signal for causing the reproducing device to identify various information of the pixel data group immediately after the header signal. Each header signal consists of 6 words, and they have a common signal format.

Note that when transmitting a digital video signal for one field, pixel data of 239 luminance signals in the vertical direction and 456 luminance signals in the horizontal direction are transmitted (in the case of NTSC system), so each pixel data group The only difference is that the number of words is approximately 1/2, which is 120 words, and otherwise the same words and signal format as above are used for transmission.

Referring back to FIG. 1 again, the VTR 9 plays back a magnetic tape on which an NTSC color video signal relating to a moving image is recorded together with an audio signal, and supplies the playback signal to the analog signal processing circuit 10. The analog signal processing circuit 10 is well known as previously disclosed by the applicant in Japanese Patent Publication No. 58-23998 (W Application No. 52-25262), etc., so a detailed explanation thereof will be omitted, but the input color The video signal is separated into a luminance signal and a carrier chrominance signal, and the carrier chrominance signal is down-converted to the high frequency band of the luminance signal, and then band-sharing multiplexed to the band-limited luminance signal to produce a composite color video signal. On the other hand, the audio signal (two channels) is frequency-modulated and then frequency-division multiplexed to the above-mentioned composite color video signal.

Further, the analog signal processing circuit 10 generates a chapter address signal Ac, a time address signal AT, and a page address signal AN and multiplexes them within each specific 1H period within the vertical blanking period of the composite color video signal, Further, a predetermined carrier wave is frequency-modulated with a signal obtained by frequency-division multiplexing a frequency-modulated audio signal on this signal to generate a second FM signal, which is supplied to the terminal 8b of the switch circuit 8. 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 AT is an address signal indicating the total time, and the page address signal AN refers to the track on which the disk is rotated. Signal fp 3 This is an address signal indicating the number of tracks when one starts from the recording position, and each of these address signals is composed of 29 bits.

The frequency spectrum of the second FM signal is as shown by the solid line in FIG. In the figure, ■ indicates the carrier wave shift frequency band of 2.3 MHz of the frequency-modulated luxury signal, and ra is 6, which corresponds to the sync tip, and IM
The frequency of HZ, fb is 6, 6M, which corresponds to the pedestal.
The l-IZ frequency, fc, indicates a frequency of 7.9 MHz corresponding to the white peak. Also, I[L, Iru indicate the lower sideband and upper sideband of the frequency-modulated luminance signal, and I[[L, I[[lJ] represents the frequency-modulated audio signal rA+
, rAz are further frequency modulated to show the lower sideband and upper sideband of the signal. ■ is a 2-channel frequency modulated audio signal f
AI, f^2 carrier wave 3.43 MHz, 3.7
3 MHz is shown.

Furthermore, ■ indicates the frequency band of a low-pass converted carrier color signal obtained by low-pass converting the carrier color signal. Also, the first sidebands generated by frequency modulating this low-pass conversion carrier color signal are VIL and VILI, and the second sidebands are ■L and ■U.
are shown respectively.

Note that reference signals fp+, fp2, and fP3, which will be described later, are located in an empty frequency band below the band ■L. The purpose of separating the occupied bands of the reference signals fρ1 to fρ3 and the information signal is because it is necessary to reproduce them using the same reproduction needle.

Either one of the first FM signal having a frequency spectrum as shown by the solid line in FIG. 5 and the second FM signal having a frequency spectrum as shown by the solid line in FIG.
Only the signal is supplied from the switch circuit 8 to the recording device 11. The recording device 11 is a known cutting device using a laser beam, and the first or second FM signal described above is supplied as a first input signal, and the recording device 11 is a disc-shaped recording @ 4 phi equal to one rotation period of the disc. The burst-like first
reference signal fP I and burst-like second reference signal f
The second input signal is a signal consisting of a reference signal in which P2 is alternately switched and arranged alternately, and a third reference signal fP3 generated in relation to the switching position of rp, , rp2. The signal is supplied from the input terminal 13 as a signal. Recording device 1
1 converts these two human signals into the first one. The laser beams are converted into second modulated laser beams and simultaneously focused 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 disk is subjected to a known development process, and then a disk 12 having an electrode function and a track pattern as shown in FIG. 7 in which no needle guide groove is formed is manufactured by a known one-disc process. .

In FIG. 7, a disk 12 has a spiral track T in which information signals consisting of image signals, audio signals, and address signals are converted into frequency modulated wave signals (first FM signal, second FM signal). Bits are intermittently formed and recorded according to the information content. Among one continuous spiral track T shown by a solid line in FIG. 7, the tracks corresponding to each rotary valve of the disk 12 are tl + '2, [3 +...
・Indicated as.

Each track has information signal bits formed on a flat surface, and no needle guide groove is formed. - For each horizontal scanning period (1H), for the analog recording track, a first reference signal "bit of ρ1,
A pit of ρ2 is formed in the second reference signal.

Only one of the bits of the reference signals fPI and fP2 is formed at an intermediate position between the center lines of adjacent tracks, and the reference signals fpl and fp2 are recorded for the - track. The sides change with each track. That is, in FIG. 7, the track of the reference signal fP I is shown by a broken line, and the track of the reference signal fP 2 is shown by a dashed line. ■1°v2+v3+... indicates the position of the vertical synchronizing signal of each field. Also, each track tl,
t2. The starting position of t3゜..., that is, the reference signal fP
The position VllV5. where l and fP2 switch. V9
．． . . , the third reference signal fP3 is recorded for approximately 3H period, for example.

Further, one rotation period of the disk 12 is equal to, for example, a four-field period of a video signal, and the vertical blanking period of an analog recording track is shown in FIG. 14a.

Tracks tl, t2゜t3 within the range shown in b, c and d
．． It is recorded in tJ.

Further, the address signals AC, AT, and ΔN are recorded in time series in each of the four vertical blanking period recording portions a to d of the analog recording track of the disk 12.

Furthermore, the digital recording track js of the disk 12,
(6, ry, . . . are also formed on the spiral track T, but after one block of signals in the signal format shown in FIG. 3 is synthesized in time series, they are combined with the first FM signal. Vertical blanking period recording part a
~d does not exist.

However, the digital recording track t5. t6゜ty
,..., the above reference signal fp3 is the reference signal fp3 of the analog recording track (it to t4) and the disc 1
Reference signals fp+ and fp2 are similarly recorded at a 1H period on both sides. In other words, the reference signals fP1 to fP3 are always recorded on the disk 12 at a constant period, regardless of whether the analog recording track or the digital recording track is the same.

The present applicant previously proposed a disc in which analog recording tracks and digital recording tracks are recorded in a mixed manner, and a reproducing apparatus therefor in Japanese Patent Application Nos. 58-83232 to 1987-83235. In the disc to be reproduced in the present invention, the sampling frequency of the recorded digital audio signal of the digital recording track is
It is characterized in that it records a digital audio signal that is the same as that of a digital audio disc.

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).
Of the existing video discs on which only analog recording tracks are recorded, the third disc has a 525-scanning line system for recording composite video signals, and the fourth disc has a 625-scanning line system. disc, and a digital audio disc (No. 5) proposed by the applicant.
This is a playback device that is configured to be able to playback compatiblely any of the following discs (discs):
The signal is supplied to a monitor playback device of either the 5-bokuto type or the 625-piece type. For convenience of explanation, the above-mentioned monitor playback device has a scanning line number of 525.
The reproduction ii, which is a device originally supposed to display a TSC color video signal and supplies a reproduced composite video signal to this monitor reproduction device, will be explained as an example.

There is already a recording and reproducing method for a rotating recording medium that allows the recorded edge video signal of a video disc to be reproduced and displayed without any practical problem by a monitor reproducing device that displays a television signal with a different number of scanning lines. The applicant is JP-A-56
-158581 (Japanese Patent Application No. 55-61998).

The rotation speed control based on the recording and reproducing method proposed by the present applicant is performed as described later by the servo circuit of the motor 18 that rotates the turntable 17 in the player section 15 in FIG. 1. 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.The command processor 20 receives the key human power signal of one key human power device and the external signal. Command signals and the like from a device with a judgment function such as a personal computer are supplied, and a display (not shown) is driven depending on the display mode, and the input is transferred to the microprocessor 21.

The microprocessor 21 generates a clock and status and supplies them to the command processor 20, as described later, and also controls the operations of various mechanisms and circuits within the player section 15, and allows external insertion of a disk by inputting the load switch. state. The disc 22 is the player part 1
As previously proposed by the applicant, the outside of the player 5 is enclosed within a storage case, and is pulled out after the storage case is inserted into the player section 15 in which the disc can be inserted. and the prescribed Nada structure (detailed explanation will be omitted)
As a result, the lid plate of the storage case and the disc 22 remain in the player section 15, and the disc 22 is placed on the turntable 17.

On the other hand, at the same time, the player section 15 is
A plurality of microswitches (not shown) provided deep inside the disc are turned on or off, and as previously proposed by the present applicant in Utility Model Application No. 57-33477, various discs can be It is possible to identify the recorded content and the disc surface to be played.

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 the aforementioned analog recording tracks and digital recording tracks are mixed) is also identified as a video disc. A disc discrimination signal (such as a disc discrimination signal indicating whether the disc is
4, respectively. As a result, the microprocessor 21 serially outputs, for example, a 25-bit status to the command processor 20 and the bin terminal 253 of the DIN type 8-pin connector.

The above 8-bin connector has 8 bin terminals 251 to 258
is arranged, and the adapter part 16 is placed in the bin terminal 251.
Address data is input from the bin terminal 252, a reproduced signal (RF multiplied signal) is output as described later, and the bin terminal 254 receives commands from a device with a judgment function such as an external personal computer as necessary. A signal is input.

Further, a clock signal from the microprocessor 21 is outputted from the bin terminal 255, and an external synchronization signal is inputted from the adapter section 16 to the bin terminal 257. Furthermore, bin terminal 258 is grounded and bin terminal 256 is not used. Note that when connecting the player section 15 to a personal computer or the like, the adapter has the following points: address data is output from the bin terminal 25+, a playback audio signal is output from the bin terminal 256, and the bin terminal 257 is not used. Part 1
This is different from when connecting with 6.

The above status taken out from the microprocessor 21 is serially output in synchronization with a clock signal,
From the bin terminal 253 to the bin terminal 261 of the adapter part 16
Bin terminal 26 of a DIN type 8-bin connector with 26B
3 to the status decoding circuit 27. Note that the above clock signal is outputted to the status decoding circuit 27 and the like via the bin terminals 25s and 26s, respectively. The status decoding circuit 27 determines and obtains 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 as a video disc). The signal is transferred to the switch circuits 28, 29 and the variable frequency divider 36.
．． The switch circuit 28 outputs a signal obtained by determining the value indicating whether the recording video signal of the disk 22 is of the 525 scanning line system or the 625 scanning line system, which is output to the switch circuit 39 and is also placed in the fourth bit of the input status. .29 and still image decoder 30
Output to.

Further, the switch circuits 28 and 29 include a discrimination circuit 7, which will be described later.
3, a signal indicating whether the reproduced track is a digital recording track or an analog recording track is supplied as a switching signal. As a result, switch circuits 28 and 29
is when playing a digital audio disc and when playing disc 1.
During the reproduction period of digital recording track No. 2, the connection is switched to the terminal A side, and at other times, the connection is switched to the terminal V side.

Inside the adapter section 16, a color subcarrier frequency (in this case, 3.579545 MH2' ) of 4
an oscillator 32 that oscillates at a frequency equal to twice the frequency, and a digital signal (block) of the digital audio disk;
6,174M, which is 140 times the transmission frequency of
An oscillator 33 that outputs an oscillation frequency of Hz is built-in.

The 6.174 MHz signal output from the oscillator 33 is supplied to the terminal Δ of the switch circuit 28, while the frequency divider 34 divides the signal to 1/3.
After being frequency-divided by 92 to 15.75kf-1z, it is 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 set to 4kHz7, it is supplied to the two terminals V of the switch circuit, while being passed through the variable frequency divider 36 to the 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.

The phase comparator 37 is a well-known phase locked loop (
The output signal of vC038 is supplied to the phase comparator 37 through the variable frequency divider 39, while
It is supplied to the terminal V of the switch circuit 28. Here, if the disk 22 is the disk 12, the switch circuits 28 and 29 are the status decoding circuit 27 and the discriminating circuit 7.
Since the output signal of terminal 3 is controlled to selectively output the input signal to terminal 1 or 3, the output signal of VCO 38 or oscillator 33 is supplied from switch circuit 28 to digital signal demodulation circuit 40 as a master clock signal. At the same time, the switch circuit 29 outputs the frequency divider 35.
Or, a signal with a frequency equal to the horizontal scanning frequency 15.734 kHz or 15.75 kHz from 34 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. be done.

Here, the above master clock signal is
The frequency is selected to be, for example, 140 times the transmission frequency (word transmission speed/second) at the time of reproduction of the digital signal 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, the digital recording track has 2940 blocks per rotation of 44.0
Although recording is performed at a transmission frequency of 56 kHz, as will be described later, during the digital recording track reproduction period, the switch circuit 29 is switched to the terminal A side, and the motor 18 is switched from the original 899.1 rpm during the analog recording track reproduction period. After switching to 900 rpm, the transmission frequency of the reproduced digital signal is 44.100 (= 44.056
×900÷899.1) Played with kl-1z.

Therefore, during the reproduction period of the digital recording track of the disk 12, the switch circuit 28 is switched to the terminal A side, and the oscillator 33 outputs 6.174 MHz (= 44,1
00x103x140) is supplied to the digital signal demodulation circuit 40 as a master clock signal.

Note that the disk 22 is a disk in which a composite video signal of a 625 scanning line system such as the PAL system or the SECAM system is converted into a predetermined signal format and recorded at a rate of 4 fields on an analog recording track for one rotation. 2nd disk), the digital recording track has 44.3528 blocks per rotation, as described above.
Recorded at a transmission frequency of 100 kHz.

In this embodiment, as will be described later, the recording horizontal scanning frequency of the second disk is 15.625 kl-IZ, which is 144, so that it can be reproduced without any practical problem in the NTSC standard monitor image reception mode. NTSC horizontal scanning frequency 15.734 kHz, which is /143 times
Since the rotation of the motor 18 is controlled so that the rotation is reproduced at 755.24 (
= 750x (144/143)) Played with ROM. Therefore, the transmission frequency of the digital signal reproduced from the digital recording track of this second disk is not 44.100 kHz2r, but 44,408 kHz.
(=44,1x (144/143)) kHz
Therefore, in this case, the frequency division ratio of the variable frequency divider 36 is 1.
/125, and the frequency division ratio of the variable frequency divider 39 is switched to 1/49392. As a result, when reproducing the second disc, the VCO 38 outputs a signal of 6,217 MHz, which is 49,392/125 times the horizontal scanning frequency of 15.734 kHz, that is, 140 times the transmission frequency of 44,408 kHz. The master clock signal is taken out and sent to the switch circuit 2 as a master clock signal.
8 to the digital signal demodulation circuit 40.

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

The input signal from the bin 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, teeth of 50 UA are formed at equal angular intervals on the outer peripheral side of the gear gear 48.
A magnetic detector 46 is provided at a position facing the teeth at a short distance apart. As a result, when the motor 18 rotates, the turntable 17. The disk 22 placed on the turntable 17 and the gear gear 48 rotate, and each time one tooth of the gear gear 48 passes in front of the magnetic detector 46, one pulse is sent to the magnetic detector 46.
The signal is taken out from the filter and supplied to the comparator 45.

Here, if the disc 22 is the first disc or the third disc, one
N with 525 scanning lines at a rate of 4 fields per rotation
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 from the frequency divider 43 whose period is 21 times the horizontal scanning period (H) taken out from the switch circuit 24 and the output pulse from the magnetic detector 46 are used. The pulses with a period of 21H are each supplied to a comparator 45, where they are converted into an error voltage according to the phase difference between the two signals, and then passed through a motor drive amplifier (MDA) 49 to the motor 1.
8.

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.
The L system or SECAM 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
is switched and connected to the terminal P side, and the 25H period pulse from the frequency divider 44 and the 25H period pulse from the magnetic detector 46 are taken out.
The H-period pulses are each supplied to a comparator 45, where they are converted into an error voltage and then applied to the motor 18 through a motor drive amplifier 49.

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 kHz) supplied to the frequency dividers 43 and 44, respectively. As a result, if the disk 22 is the first disk or the third disk, the motor 18 and the disk 22 will run at 899.1 rpm.
On the other hand, if the disk 22 is the second disk or the fourth disk, the motor 18 and the disk 22 are rotated at a normal rotation speed of 75 rpm.
It is rotated at 755.24 ppm, which is 143 times higher.

Furthermore, when the disc 22 is a digital audio disc (fifth disc), the switch circuit 24 is connected to the terminal N side, and a 750Hz signal obtained by dividing 15,75kHz by 1/21 by a frequency divider 43 is output. is supplied to the comparator 45 through the switch circuit 24, so that the motor 18
is rotationally controlled so that the output signal of the magnetic detector 46 is 750 Hz, that is, 900 rpm.

Furthermore, during the reproduction of the first disc, the two switch circuits are connected to the terminal V during the analog recording track reproduction period, so that the motor 18 is connected to the terminal V as described above.
The rotation is controlled by rpm, but during the reproduction period of the digital recording track, two switch circuits are switched and connected to the terminal A side, and the output 15.75kHz of the frequency divider 34 is connected to the switch circuit 2.
9. Since it is supplied to the frequency dividers 43 and 44 through the switching circuit 41, and the switching circuit 24 is connected to the terminal N side, the rotation speed is 90°, which is the same as that of the fifth disk.
It can be switched to rotate at rpm.

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. A signal is output, after which the scanning needle 51 is caused to slide over the disk 22. The disk 22 has an electrode function, and the scanning needle 5
1, an electrostatic capacitance is formed between the disk 22 and the electrode of the scanning needle 51, and this changes in response to changes in the geometrical shape of the recording track. The changes are converted into electrical signals by pickup circuit 52 in a known manner.

The reproduction signal (RF
The multiplied signal is supplied to a known tracking servo circuit 53, where the aforementioned reference signal "ρ1°fPz is discriminated and separated, envelope-detected, and the detected outputs are differentially amplified and converted into a tracking error signal. This tracking error signal is applied to the tracking coil 54,
The tip of the scanning needle 51 is momentarily and minutely displaced in the track width direction so that the scanning needle 51 always scans on the information signal recording track without track deviation.

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 the second FM signal reproduced from the analog recording track is subjected to FM demodulation. After the video signal and audio (No. 5) are reproduced, the reproduced composite video signal is output to the output terminal 56, and the reproduced audio signal of the 2-channel V channel is output to the output terminals 57 and 58.

Furthermore, the reproduced signal taken out from the pickup circuit 52 is
Adapter part 16 via pin terminals 252 and 262, respectively.
The signal is supplied to the FM demodulation circuit 63 in the FM demodulation circuit 63, where it is FM demodulated, and then supplied to the vertical synchronization signal detection circuit 64, the address data acquisition circuit 65, and the digital signal demodulation circuit 40, 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 an error detection code in the demodulated digital signal of the signal format shown in FIG. 3 reproduced from the digital recording track. CRC is used to detect the presence or absence of an error, and if there is an error code, it is restored to the original correct code using error correction codes P and Q.
A digital audio signal placed at a position indicated by Ch-4 and transmitted is output to the DA conversion and switching device 62, while a digital video signal placed at a position indicated by at least one of Ch-3 and Ch-4 is output ( When component encoded data> is transmitted, the digital video signal is supplied to the still image decoder 30.The DA conversion and switching device 62 converts a digital information signal such as a digital audio signal from digital to analog, and then converts the digital information signal, such as a digital audio signal, into an analog signal by a switching circuit. , the switching is controlled by the output of the address data acquisition circuit 66, and the output signal is sent to the output terminals 67 to 70.
Output to.

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. In addition, the still image telecoder 30 also includes a status decoding circuit 2.
According to the control signal from 7, if the two-channel digital video signal relates to two still images, the still image of any one of the negative channels is selected and demodulated and output.

The address data acquisition circuit 66 accumulates incoming signals one bit per block to obtain a control signal in the signal format shown in FIG. 4, and then acquires data.

The data fetched by the address data fetch circuit 66 is supplied to the terminal of the switch circuit 72, while the data fetched by the DA
A switching signal supplied to the conversion and switching device 62 and generated based on the data allows only the audio signal transmission channel to pass through and is output to two or more predetermined output terminals among the output terminals 67 to 70 of each of the four channels. let

The address data acquisition circuit 65 discriminates and separates the address signal in the reproduced signal reproduced from the analog recording track, 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 the vertical synchronization signal detection signal from the vertical synchronization signal detection circuit 64 and a signal (error check signal) indicating the test result by the error check code CRC from the digital signal demodulation circuit 40, and During a period when no signal is received and a signal indicating that the test result is correct is received, it is determined that the digital recording track is being reproduced, and the switch circuit 72 is connected to the terminal side. On the other hand, during a period in which the detection signal is received and a 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 switched to the terminal AN. 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. The command processor 20 is a scanning needle 51
The microprocessor 21 feeds various signals generated based on a desired signal from one key human-powered device and the input address data (outputs them to the structure 50). .

Further, the discrimination circuit 73 switches the switch circuits 28 and 29 to the first
Only during reproduction of the disc (disk 12), the connection is switched to the terminal A side during the digital recording track reproduction period, and to the terminal V side during the analog recording track reproduction period, based on the output track position discrimination signal. When playing a disc other than the first disc, the output l of the discrimination circuit 73
- The rack position determination signal is not used for the switch circuit 28 and the two switchings.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and various other modifications are possible, and the present invention can also be applied to a disc playback device using a 625-scanning-line method. However, in this case, the second and fourth disks are 75
At 0 ppm, the first. The third disc is 892.8 rpm
The rotation is controlled by the first. The second disk is rotated at the same number of rotations without distinction between the digital recording track reproduction period and the analog recording track reproduction period.

The present invention can also be applied to an apparatus for reproducing a disc in which a composite video signal of N fields (N is a natural number of 2 or more) is recorded on an analog recording track 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, the adapter section 16 may be built into the player section 15.

Furthermore, although the present invention has been described so as to be compatible with the digital audio discs and video discs proposed earlier by the applicant, the present invention is not limited to this, and can be applied to discs configured such that recorded signals can be read with a light beam. It goes without saying that the present invention can also be applied to discs in which the reference signals fρ1 to fP3 are not recorded.

Furthermore, as previously proposed by the present applicant in Japanese Patent Application No. 58-13944, the information signals to be recorded may be in the form of an interaction between a device with a judgment function such as an external personal computer and a disc playback device. It also includes programs for controlling.

Effects of the Invention As described above, according to the present invention, information signals can be suitably reproduced from a disc on which analog recording tracks and digital recording tracks are mixed, regardless of the track. By rotating the disk at a different rotation speed during the track playback period than during the analog recording track playback period, the playback digital signal from the digital recording track can be played back at the same transmission frequency as the existing digital audio disk. It has features such as being able to record on a disc by sharing the recording system of a digital audio disc, and being able to obtain a high-quality reproduced audio signal with a high dynamic range equivalent to that of a digital audio disc.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a block system diagram of an embodiment of the device of the present invention;
The figure is a block system diagram showing an example of the recording system of a disc to be reproduced by the apparatus of the present invention, FIG. 3 is a diagram showing an example of the signal format of one block of digital signals recorded on the digital recording track, and FIG. FIG. 5 is a diagram showing an example of the signal format of each address code recorded on the digital recording track. FIG. 5 is a diagram showing an example of the frequency spectrum of the frequency modulated wave signal and reference signal recorded on the digital recording track. FIG. 7 is a diagram showing an example of the frequency spectrum of a frequency modulated wave signal and a reference signal recorded on an analog recording track, and FIG. 7 is a diagram showing an example of a track pattern of a disc to be reproduced by the reproducing apparatus of the present invention. 1.2.9... VTR, 3, 4... PCM recording/reproduction block, 6... Digital signal processing circuit, 10... Analog signal processing circuit, 12.22... Information signal recording disk ( disk), 15... Player section, 16... Adapter section, 18... Motor, 20... Command processor, 21... Microprocessor, 24.28, 2
9゜72...Switch circuit, 27...Status 1
1 circuit, 3o...Still image decoder, 32, 33.42
... Oscillator, 34.35, 43.44... Frequency divider,
36° 39... variable frequency divider, 37... phase comparator,
38... Voltage controlled oscillator (VCO), 40... Digital signal demodulation circuit, 45... Comparator, 46... Magnetic detector, 48... Gear gear, 51... Running needle, 5
2...Pickup circuit, 55...Information signal reproducing circuit, 56...Reproducing composite video signal output terminal, 57.58
... Reproduction audio signal output terminal, 63 ... FM demodulation circuit, 64 ... Vertical synchronization signal detection circuit, 73 ... Discrimination circuit. Patent applicant: Victor Japan Co., Ltd. Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] an analog recording track on which a modulated wave signal obtained by analog modulation with a first information signal containing at least a composite video signal of one television system, and a modulated wave signal obtained by digital modulation with a second information signal; A recording is formed in which a digital recording track in which one block of signals containing at least digital data is synthesized and recorded in time series at a predetermined transmission frequency different from that of a digital audio disk for each block is mixed on the same disk. a first reproducing circuit for reproducing the first information signal from the reproducing signal from the reproducing means; and a first reproducing circuit for reproducing the first information signal from the reproducing signal from the reproducing means. a second reproducing circuit that reproduces the second information signal;
a master clock signal generation circuit that supplies a master clock signal of a constant frequency to the second reproduction circuit; a synchronization signal separated from the first information signal reproduced by the first reproduction circuit; and a synchronization signal separated from the first information signal reproduced by the first reproduction circuit; means for detecting a reproduction track position from an error check signal extracted from a part of the circuit;
Based on the output signal of the reproduction track position detecting means, the reproduction block signal of the digital recording track is reproduced at the same transmission frequency as that of the digital audio disk during the reproduction period of the analog recording track. 1. An information signal recording disc reproducing apparatus comprising servo circuit means for switching and controlling the rotation of a motor for rotating the information signal recording disc to a rotation speed different from that of the information signal recording disc.