JPS6218690A - Information signal recording disk - Google Patents

Abstract

PURPOSE:To retrieve a desired track position in a short time at a random access by updating the information contents of the 1st address signal recorded on a digital recording track and the 2nd address signal recorded on an analog recording track with the specific position of each rotating period as a start point. CONSTITUTION:An address signal showing which track position of an informa tion signal recording disk 1 is recorded on the digital and analog recording tracks, and a recorded position switching the digital and analog recording tracks is selected at any specific position with one rotating period on the information signal recording disk. The information contents of the 1st address signal recorded on the digital recording track and the 2nd address signal recorded on the analog recording track among address signals are updated and recorded with said each specific position as a start point. Thus, the information contents can be made continuous irrespective of the type of recording tracks.

Description

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

2. Description of the Related Art Conventionally, analog information signals such as composite video signals and audio signals are subjected to frequency modulation (FM) and recorded on concentric or spiral tracks as, for example, changes in geometric shapes. (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. Note that on a video disc, for example, an address signal for random access is recorded during a specific period within the vertical blanking period of a composite video signal, and the address signal is a coded digital signal. Since the main body of information is an analog-modulated composite video signal, etc., a track such as the recording track of this video disc will hereinafter be referred to as an "analog recording i-rack" for convenience in this specification.

On the other hand, discs in which an audio signal or an audio signal and a video signal are each digitally modulated and then synthesized in a time-series manner and recorded on concentric or spiral tracks as, for example, changes in geometric shape, have also been conventionally used. widely known. This disc is called a digital audio disc because the recorded information is mainly an audio signal, and the video signal is mainly a still image and serves only as auxiliary information to help the imagination of the listener of the audio signal. ing. On the recording track of this digital audio disk, information signals such as audio signals and still image single character data are 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, in contrast to video discs, the above-mentioned digital audio disc uses a digital signal as the green signal, and due to the characteristics of digital signal transmission, audio signals can be reproduced with extremely high fidelity over a wide dynamic range, and still images can also be reproduced with extremely high fidelity. It is 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 back at the same time. , since it is an analog signal transmission,
For example, compared to the 3,000 still images of a digital audio disc, it is possible to obtain 54,000 still images, and it is also possible to transmit information signals in a band of several MHz in real time, improving the accuracy of information. Compared to digital audio discs, which transmit information signals in a band of about several tens of kHz to increase the performance, this has the advantage that moving images can be played back together with audio signals. Therefore, in order to optimally reproduce recorded information,
It is desirable to select and record either a digital signal or an analog signal depending on the information content.

In particular, disks are attracting attention as image files for various purposes such as entertainment, education, and sales promotion because of their storage capacity for multi-R information and their ease and speed of retrieval, and are widely used in sales promotion systems.

In order to establish an attractive system that meets the demands for diversifying performance9 functions, a variety of software combinations such as moving images, still images, audio, and data are required.

Conventionally, in order to meet this requirement, optical video discs have been known in which analog recording tracks are formed in which analog video signals and character data related to moving images and still images are recorded in an analog-modulated manner. The recorded signal of this optical video disc is reproduced and demodulated by a known optical video disc player 1 shown in FIG. 7, and converted into an analog video signal. The data portion of the reproduced analog video signal is reproduced by the data decoder 2 and then supplied to the switch 3. On the optical video disc mentioned above, a code indicating that the recorded signal is a data part is recorded before the data part, and a switching signal obtained by playing this by the player 1 causes the playback signal to be changed to the character data. etc., the switch 3 selects and outputs the output signal of the data decoder 2 to the monitor 4, and when the playback signal is an analog video signal related to a moving image or a still image, the switch 3 selects and outputs the output signal of the player 1 to the monitor 4. Selectively output to.

Problems to be Solved by the Invention However, the above-mentioned optical video disc has only analog recording tracks, and therefore the color reproducibility of reproduced still images is insufficient, especially for cosmetics, kimonos, etc. This method was unsuitable for the reproduction of still images that require faithful color reproduction of the real thing.

By the way, as proposed by the present applicant, the above-mentioned video disc is capable of reproducing recorded signals by detecting changes in capacitance formed between the electrode of a scanning needle called a sensor and the disc. Tracking control reference signals of different frequencies are recorded on both sides of the information signal recording track (analog recording track), and tracking control is performed by comparing the reference signal levels during playback, thereby adjusting the needle guide groove. A video disc that eliminates the need for is known. On the other hand, some of the above-mentioned digital audio discs, as proposed by the applicant,
Similarly to the capacitance change reading type video disc described above, the reference signal for tracking control is transmitted to the information signal recording track (
It is known that there is a capacitance-variable reading type digital audio disc without a needle guide groove, which is recorded on both sides of a digital recording track. This digital audio disk is rotated at the same rotation speed as the capacitance change reading type video disk described above during playback, and the frequency of the reference signal for tracking control and the method of playback are the same, and furthermore, the i! F! They are also similar in that they have a configuration in which a recorded signal can be read by detecting a change in height of 1 m. Therefore, even when this digital audio disc is played back by a video disc playback device, the scanning needle is caused to perform a normal tracking operation in the same way as when playing a video disc, and the previously recorded signal can be picked up and played back from the scanning needle. By supplying the reproduced signal to the adapter, the original audio signal etc. can be demodulated.

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

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

Therefore, the present applicant has proposed, in Japanese Unexamined Patent Publication No. 59-2074033 (Japanese Patent Application No. 58-83232), etc., by recording and forming analog recording tracks and digital recording tracks in a mixed manner depending on the recorded information content. We have proposed an information signal recording disc that can maximize the respective advantages of the above-mentioned video disc and digital audio disc, and that can be reproduced in a completely compatible manner.

The present invention provides a disc in which analog recording tracks and digital recording tracks are mixed together.
It is an object of the present invention to provide an information signal recording disc on which address signals are recorded so as to be reproduced suitably.

Means for Solving the Problems In the information signal recording disk of the present invention, an address signal indicating a position among all the recording tracks of the information signal recording disk is recorded on each of the digital recording track and the analog recording track. The switching recording position between the digital recording track and the analog recording track is selected as one of the specific positions in one rotation period of the disk, and the first address to be recorded on the digital recording track among the address signals is selected. The information contents of the signal and the second address signal to be recorded on the analog recording track are updated and recorded starting from the specific position of each one rotation cycle.

Operation: Of the first and second address signals recorded on the disc, the second address signal is updated starting at a specific position in one rotation period of the disc, similar to the address signals of existing video discs.

On the other hand, the first address signal is repeatedly recorded about several times per revolution of the disc, whereas the second address signal is repeatedly recorded only about four times per revolution of the disc. Therefore, by setting the recording position for switching between the digital recording track and the analog recording track to the specific position, the second address signal can be suitably reproduced, and the first address signal can also be changed over the number of recording times per rotation. Since there are many , it is suitable for playback even during random access.

Embodiment FIG. 1 shows a schematic track pattern of an embodiment of the disc of the present invention. In the same figure, the track t+”− is indicated by a solid line.
ts+t12-tIs are analog recording tracks, and tracks 16-to indicated by broken lines are digital recording tracks. Such analog recording track t1
~ts, t+2~t15 and digital recording track t6
Disk 1 on which recordings were formed with a mixture of ~t I+.
Among the specific positions @2 in one rotation period above, the positions indicated by 2a and 2b are selected as switching recording positions between the analog recording track and the digital recording track. Further, as described later, a composite video signal, an audio signal, and an address signal are frequency-modulated and recorded in the analog recording tracks t1 to ts and t+2 to tIs, and the digital recording track t6
As described later, digital data of audio signals and still images are frequency-modulated and recorded in ~t I+, and furthermore, in the above-mentioned specific positions fi2.2a and 2b, as described later, a third tracking control reference is recorded. A signal fρ3 is recorded for a certain period of time.

Next, a recording system for recording and forming the above disc 1 will be described. FIG. 2 shows a block system diagram of an example of this recording system. In the figure, the VTR 4 converts two channels of audio signals into PCM modulation (pulse code modulation) separately at a sampling frequency of 44.056 kHz, and converts them into digital data with, for example, 16 bits of ω conversion bits per sampling point. A magnetic tape in which a signal consisting of an error check code and an error correction code is inserted into a composite synchronization signal as a video period signal of a composite video signal is frequency modulated and recorded in advance on a slanted track. On the other hand, the VTR 5, for example, uses a magnetic tape on which two channels of still image signals, which are component-encoded pixel data with 8 quantization bits per sampling point, are frequency-modulated and pre-recorded on inclined tracks. The VTRs 4 and 5 are each operated synchronously based on a synchronization signal from a synchronization signal generator (SSG) 6, and frequency demodulates the reproduced signals of each two channels and sends them to digital processors 7 and 8. supply each.

The digital processors 7 and 8 are supplied with the frequency demodulated reproduction signal, and use the reproduced error checking code and error correction code to correct any errors in the reproduced digital data or reproduced component encoded data of the video period. , the digital processor 7 supplies a two-channel digital audio signal with a quantization bit number of 16 bits and a sampling frequency of 44.056 kl-12 to the digital recording track encoder 9, and the digital processor 8 supplies a 2-channel digital audio signal with a quantization bit number of 8 bits and a sampling frequency of 44.056 kl-12. 2 channel pixel data 2
Each signal is extracted at a sampling frequency of 88.112 kHz and supplied to the digital recording track encoder 9.

The above digital recording track encoder 9 is 5SG.
Under the control of the output signal of 6, one block of signals in the signal format shown in Fig. 3 is generated, and these are synthesized in time series at a transmission frequency of 44.056 kHz in block (frame) units. , furthermore, the first signal obtained by frequency modulating a carrier wave of, for example, about 7 MH2 with this composite digital signal.
FM signal is supplied to the terminal 10a of the switch circuit 10.

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-2,0il-
3 and Ch-4 each indicate the arrangement position of one word of the 16-bit digital signal (that is, the digital audio signal and component encoded data) of one channel among the four channels.

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

).

Furthermore, U is two reserved bits called user's bits. One block of signals is composed of a total of 130 bits from S to U shown in 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 t11 control signal has a configuration in which four 49-bit address codes are synthesized in chronological order, and each of these four types of address codes has a signal format as shown in Figure 4. ing. In Fig. 4, the first 24 bits indicated by 5YNC out of the total 49 bits 1 to 1 address code are synchronization signals, and there are 4 types of values (
time address.

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

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

As will be described later, the composite video signal is converted into a predetermined signal format and recorded on the analog recording track of the disc at a rate of 4 fields per revolution. 89 for method
9.1 (= (59,94/4) x 60) rpH
In the case of PAL system or SECAM system, it is 750 (
-(50/4) x 60) rpm. Therefore, the digital recording track for one revolution of the disc has 2940 (= 44.056 x 103 x
(4159,94)) blocks are reproduced, and the above 196-bit control signal is reproduced 15 times in one disc rotation period.On the other hand, for a disc that is to be reproduced at a rotational speed of 75 rpm, the number of blocks is 3528 (= 44.100x
103 x (4150)) blocks are reproduced, and the above control signal is 1 during one disk rotation period.
It will be played eight times.

Note that among component encoded data regarding still images, for example, pixel data of a luminance signal has a sampling frequency of 9 MH.
2. 8 bits per pixel is transmitted at a sampling frequency of 88.112 kHz, and two types of color difference signals (
The pixel data of R-Y) and B-Y are each transmitted at a sampling frequency of 2.25 MHz, and data with a hanging number of 8 bits per pixel is transmitted at a sampling frequency of 88.112 kHz.

Returning to FIG. 2 again, the above-mentioned composite video signal and the like are recorded on the inclined track of the recorded magnetic tape (master tape) to be played back by the VTR 11, and the time code track is recorded with, for example, the U.S. SMPT of
E (Society of Motion picture
re and Te1evision l:ngin
eers) standard time code is recorded. The first time code played from this time code track and the second time code played from the same time code track by the VTR 4 are each supplied to the synchronizer 12, where the same time code is played back. The signal is converted into a signal that controls the running of the master tape of the VTR 11.

As a result, the VTRII is synchronized with the VTRs 4 and 5. In addition, the composite color video signal and the two-channel audio signal reproduced from the inclined track of the master tape by the VTR 11 are sent to the analog recording track encoder 1.
3.

This encoder 13 was first developed by the applicant in the Japanese Patent Publication No. 58-23.
Since it is publicly known as disclosed in Japanese Patent Application No. 998 (Japanese Patent Application No. 52-25262), a detailed explanation thereof will be omitted.
The input color video signal is separated into a luminance signal and a carrier color signal, and the carrier color signal is low frequency converted to the high frequency region of the luminance signal, and then band-sharing multiplexed to the band-limited luminance signal to produce a composite color video signal. On the other hand, the audio signal (2 channels) is frequency-modulated and then frequency-division multiplexed to the above-mentioned composite color video signal. Further, the encoder 13 generates a chapter address signal Ac, a time address signal AT, and a page address signal AN, and generates multiple voltages within each specific IH) 91 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 10b of the switch circuit 10. 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 is the disk-recording position.
This is an address signal indicating the number of tracks when the track to be formed by rotation is one with the reference signal fP3 recording position as the starting point, and these address signals are all 29.
Consists of bits.

A central processing unit (CPU) 14 controls switching of the switch circuit 10. The time code reproduced by the VTR 4 is supplied to the CPtJ 14, while the tracking signal generator 15 generates first and second tracking control reference signals (hereinafter referred to as reference signals) based on the signal from the 5SG6. ) A third reference signal fP3 generated together with fp+ and fP2 is supplied, a predetermined time code value to be switched is input, and the reference signal fP
3, the switch circuit 10 is switched and controlled. Therefore, the reference signal fP3 is generated at the disk rotation period as schematically shown in FIG.
For example, if the time code (track number) value shown in
2, if the analog recording track is to be switched to the digital recording track, the CPU 14 outputs a switching signal to the switch circuit 10 as shown in FIG. As shown in Figure 2, at the time the reference signal fP3 is generated, the analog recording track shown in white is switched to the digital recording track shown in diagonal lines.

In this way, the first FM signal from the encoder 9 or the second FM signal from the encoder 13, which is selectively output by the switch circuit 10, is supplied to the recording device 16. The recording device 16 is a known cutting machine using laser light, and is supplied with the above-mentioned first or second FM signal as a first input signal, and has a duration equal to one rotation period of the disc-shaped recording source 117, for example. A first reference signal f'p+ and a second reference signal fP2, which are switched every four field periods and arranged alternately, are supplied as second input signals from the tracking signal generator 15, and further, fPl, fP2 A third reference signal fP3 generated every rotation period of the recording master 17 corresponding to the switching position is supplied as a third input signal. The recording device 16 frequency-division multiplexes the first and third input signals and modulates the laser beam with the first modulated laser beam and the second input signal. The second modulated laser beam that has been able to modulate the light is applied to the photosensitive agent coated on the disc-shaped recording master 17 by 1/2.
They are spaced apart from each other by a track pitch and are simultaneously focused and irradiated. This recording master disk 17 is subjected to a known development process and! ! By passing through the disk process, a disk 1 having an electrode function and a track pattern as shown in FIG. 1 without a needle guide groove is manufactured.

Although the recording tracks of the reference signals fPl and fP2 are not shown in FIG. 1, they are recorded between the center lines of adjacent tracks of analog recording tracks and digital recording tracks, and are recorded on one part of the disc 1. The data is switched and recorded alternately for each rotation. In addition, analog recording track t+ ""
't51 The recording position of the reference signal fP3 from t12 to ts is recorded for a period approximately corresponding to the vertical synchronization signal of the 4-field cycle of the composite video signal. Furthermore, as mentioned above, both the track number code and page address signal are fP
3 shows the number of tracks in one rotation period with the starting point being one track, and the information content is continuous regardless of whether it is a digital recording track or an analog recording track.

Next, an example of a reproducing apparatus for reproducing the disc of the present invention will be explained with reference to FIG. In the figure, a disk 1 is rotated at a predetermined rotational speed, and a scanning needle 20 called a sensor is moved and scanned. By detecting the change in capacitance between the electrode of the scanning needle 20 and the pit row recorded on the disc 1, the recorded green signal is reproduced and outputted by the pickup circuit 21 in a known manner, and the video disc demodulation circuit 22 and decoder 23, respectively. The video disc demodulation circuit 22 demodulates and reproduces the composite video signal and audio signal recorded on the analog recording track, and the decoder 23 reproduces the signal reproduced from the digital recording track using a known method. The address determination circuit 24 determines whether or not an address signal is supplied from the video disc demodulation circuit 22 and the decoder 23.
When the rear address signal is supplied from 2, the output signal of the video disc demodulation circuit 22 is selectively outputted by the switch circuit 25, and when the address signal is supplied from the decoder 23, the output signal of the decoder 23 is output by the switch circuit 25. to output the selection. The output signal of the switch circuit 25 is supplied to a monitor 26, where images are displayed and sounds are produced.

In addition, in Figure 6, the tracking servo circuit and disk 1
The illustration of the rotation servo circuit is omitted.

Note that the present invention is not limited to the combination of tracks of a capacitance change detection readable type video disc and a digital audio disc as previously proposed by the applicant, and is also applicable to the switching position between an analog recording track and a digital recording track. is not limited to the recording position of fp3, but may be any recording position of the disk rotation period (however, the recording position must be within the vertical blanking period of the video signal, and the address information (especially track number) must be at that position. (selected to be updated starting from ).

Effects of the Invention As described above, according to the present invention, even if analog recording tracks and digital recording tracks coexist, address signals are recorded substantially continuously regardless of the type of track, and therefore random access is possible. In some cases, a desired track position can be searched for in a short time by using a reproduction address signal as in the conventional method.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a schematic track pattern of an embodiment of the present invention, FIG. 2 is a block system diagram showing an example of a recording system for recording and forming a disk of the present invention, and FIG. 3 is a diagram showing a digital recording track of a disk of the present invention. 4 is a diagram showing an example format of an address signal to be recorded on a digital recording track. FIG. 5 is a diagram showing the operation of the block system shown in FIG. 2. FIG. 6 is a block system diagram showing an outline of an example of a playback device, and FIG. 7 is a block system diagram of an example of a conventional disc playback device. . 1... Information signal recording disk (disc), 4.5°11
...VTR16...Synchronization signal generator (SSG), 9
...Encoder for digital recording track, 12...
- Synchronization, 13... Analog recording track encoder, 14... Central processing unit (CPU), 15
...Tracking signal generator, 16...Recording device. Patent applicant: Victor Japan Co., Ltd. Figure 1

Claims (2)

[Claims] (1) A first signal in which one block of signals including at least multiple channels of digital data obtained by digital modulation with the first information signal is synthesized in block units in a time-series manner.
A digital recording track in which a first modulated wave signal obtained by further modulating the digital signal of In an information signal recording disk formed by mixing analog recording tracks on which wave signals are recorded, an address signal indicating the position of all the recording tracks of the information signal recording disk is used for the digital recording track and the analog recording track on which the wave signal is recorded. The information signal is recorded on each of the analog recording tracks, and the switching recording position between the digital recording track and the analog recording track is selected at any specific position in one rotation period of the information signal recording disk, and the address signal Among them, the information contents of the first address signal to be recorded on the digital recording track and the second address signal to be recorded on the analog recording track are updated and recorded starting from each specific position in one rotation period. An information signal recording disc characterized by: (2) On both sides of each of the digital recording track and the analog recording track, first and second tracking control reference signals are switched and alternately recorded at one rotation period, and one of the information signal recording disks is 2. The information signal recording disk according to claim 1, wherein the specific position in the rotation period is a switching recording position of the first and second tracking control reference signals.