JPS6233366A - Synchronizing system for discoid recording device for information signal recording - Google Patents

Abstract

PURPOSE:To prevent generation of time and position deviation in recording the 1st and 2nd modulated signal with changeover by adjusting the phase of the 1st and 2nd modulated signal recording systems to the standard time axis and making each address signal coincident with each other. CONSTITUTION:An analog recording track encoder 14 counts a prescribed number of a frame clock signal of 2-frame period reproduced and outputted from a VTR 1 from a time t3, makes the signal location coincident with that of a reference signal fp3 and outputs a timing signal at a time t4 to a digital recording track encoder 15. Thus, the address signal generated from an address generator built in the digital recording track encoder 15 is set to the same value as the address signal generated from the analog recording track encoder 14 to complete the identity of the address signal. Thus, the synchronization of a master tape, the address on a disc and the information signal recording position are unequivocally confirmed and the synchronizing system with simple and stable mixture disc recording is obtained.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a periodic method of an information signal recording disc recording device,
In particular, the present invention relates to a synchronization method for an information signal recording disk recording apparatus in which a digital signal recording system mainly containing audio information and an analog signal recording system mainly containing composite video signals are operated in synchronization.

2. Description of the Related Art Conventionally, analog information signals such as composite video signals and audio signals are subjected to frequency modulation (FM) and recorded on concentric or spiral tracks as, for example, changes in geometric shapes. (referred to as a "disk"). This disc is called a video disc because the recorded information is mainly a composite video signal, and the recording track contains a modulated wave signal obtained by performing analog modulation, in which a carrier wave is modulated with an analog information signal. Composite video signals, etc. are recorded.

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. The recorded information on this disc is mainly audio signals, and the video signals are mainly still images that serve only as auxiliary information to help the imagination of the listener of the audio signals, so it is called a digital audio disc. It is called. 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 addition, in Honkawa II's book, tracks such as the recording tracks of the video disc and digital audio disc will be hereinafter referred to as ``analog recording track J'' and ``digital recording track'' for convenience.

Both the video disc and digital audio disc have a diameter of 26c! A maximum of 60 minutes of programs can be recorded on one side on an R disc. Furthermore, address signals are recorded for each recording track on both disks, which allows random access and the like to be easily performed.

Further, on both sides of the analog recording track and the digital recording track on which the information signals are recorded, tracking signals fP1. fP2 is recorded, and this tracking signal @fp1. Tracking control is performed by comparing the fpz levels. Furthermore, a reference signal fρ3 is recorded on the image recording track and at a position where the tracking signal fρ++fPz is switched.

FIG. 3 shows a block system diagram of an example of a conventional video disc recording system. In the figure, VTR1, encoder 2. The optical recording device 3 and the tracking signal generator 4 are operated synchronously by a synchronization signal generator (SSG) 5, respectively. Here, an analog signal consisting of a composite video signal and an audio signal reproduced by the VTR 1 is supplied to an encoder 2.

The encoder 2 supplies the optical recording device 3 with a first frequency-modulated wave signal (hereinafter referred to as "first FM signal") obtained by frequency-modulating a predetermined carrier wave with an analog signal.

The optical recording device 3 is a known cutting machine using a laser beam, and is supplied with the above-mentioned first FM signal as a first input signal. The tracking signal fPI#fP2, which is switched and arranged alternately in each hold period, is the second tracking signal fPI#fP2.
A reference signal, fPl, is supplied as an input signal from the tracking signal generator 4 as an input signal of
is supplied as an input signal. The optical recording device 3 modulates the laser beam with a signal obtained by frequency division multiplexing the first and third input signals, and generates a first modulated laser beam.
The second modulated laser beam, which has been modulated by the above-mentioned second input signal, is simultaneously focused on the photosensitive agent coated on the disc-shaped recording master 6 at a distance of about 1/2 track pitch from each other. irradiate. By passing this recording master disc 6 through a known developing process and disc making process, a video disc having an electrode function and without a needle guide groove is manufactured.

The above video disc records a composite video signal of 2 frames per rotation, so its rotation speed is 900 rpm.
It is said to be m. Furthermore, cutting of the same program must be recorded on the disk in the same way depending on the time of cutting, and frame locking, address signal determination, etc. are performed using timing signals pre-recorded on the master tape played by the VTR 1. .

That is, a special signal (frame lock signal) is recorded for a certain period of time during the recording period of one field of the four fields of composite video signals recorded every rotation of the video disc, and the end of this frame lock signal is recorded. The time on the disc is always set at a fixed time, thereby ensuring the reproducibility of recorded information.

FIG. 4 shows a block system diagram of an example of a conventional digital audio disc recording system. In the figure, the same components as those in FIG. 3 are denoted by the same reference numerals, and the explanation thereof will be omitted as appropriate. Further, in FIG. 4, the devices shown in each block are operated synchronously by a synchronization signal generator (not shown).

Here, the VTRs 7 and 8 are synchronously operated by a synchronization signal supplied from the data synchronizer 11.
The two-channel digital audio signals reproduced and output from each are sent to digital processor 9.10, which will be described later.
and is supplied to the encoder 12 via the data synchronizer 11, respectively. The encoder 12 supplies the optical recording device 3 with a second frequency-modulated wave signal (hereinafter referred to as a second FM signal) obtained by frequency-modulating a predetermined carrier wave using the digital signals of the four channels in total.

As a result, the second FM signal is recorded on the disc-shaped recording master 13 together with the tracking signals fPI, fP2 and reference signal f'p3 in the same manner as described above. As a result, a known digital audio disc is produced using the master disc 13.

By the way, in the recording system shown in Fig. 4, the phase of the system is adjusted based on the time codes recorded on two magnetic tapes (master tapes) that are played back by a VTR 7°8. Record the time as a fixed time on the digital audio disc.

In this way, recording can be performed on the disc even at different cutting times in approximately the same diameter area.

In addition, both the video disc and the digital audio disc are the same capacitance change reading type video disc ≧
The digital audio disc and the video disc have the feature that they can be played back using a shared disc playback device, and that the digital audio disc and video disc can be played back interchangeably.

Problems to be Solved by the Invention By the way, in the above-mentioned digital audio disc, the green signal described above is a digital signal, compared to a video disc, and due to the characteristics of digital signal transmission, the audio signal has a wide dynamic range and extremely high fidelity. The reproduced still images are also extremely clear, and of course the advantage is that the audio signals are reproduced in ultra-high fidelity together with the reproduced still images. On the other hand, when playing still images, video discs generally mute the audio signal in order to repeatedly play the same track, and unlike digital audio discs, still images and sound cannot be played at the same time. , since it is an analog signal transmission,
For example, compared to the 3000 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 MH2 in real time, which improves the accuracy of information. Compared to digital audio discs, which transmit information signals in a band of about several tens of kHz to increase the performance, this has the advantage that moving images can be played back together with audio signals. Therefore, in order to optimally reproduce recorded information,
It is desirable to select and record either a digital signal or an analog signal depending on the information content.

In particular, disks have attracted attention as image files for various purposes such as entertainment, education, and sales promotion because of their storage capacity of large amounts of information and the ease and speed of searching for such information, and their applications in sales promotion systems are popular.

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. In other words, a disc on which analog recording tracks and digital recording tracks are mixed as required (
The development of a "mixed disk" (hereinafter referred to as a "mixed disk") is eagerly awaited.

In order to satisfy and realize the above requirements, it is necessary to synchronize the video disc recording system and the digital audio disc recording system, and to determine the address signal as a mixed disc. Furthermore, it is necessary to freely switch between recording on a video disc and a digital audio disc in the program area, and furthermore, continuity of the address signal must be ensured at the time of switching.

However, there is a problem in that it is difficult to achieve the above requirements by simply synchronizing the current system. Therefore, the present invention has been developed to improve the time code and address of both the digital signal recording system and the analog signal recording system. It is an object of the present invention to provide a synchronization method for an information signal recording disk recording device that solves the above problems by matching signals.

Means for Solving the Problems The synchronization method of the information signal recording disc recording device according to the present invention is as follows:
A first modulated wave signal obtained by analog modulation with a first information signal including at least a composite video signal and a plurality of channels of digital data obtained by digital modulation with a second information signal are transmitted at a predetermined transmission frequency. Information signal recording disk recording in which a second modulated wave signal obtained by further modulating the time-series synthesized digital signal is recorded alternately in different areas on the same information signal recording disk while maintaining continuity. A device synchronization method that synchronizes the first and second modulated wave signals with the standard time axis of one of the two recording systems before starting recording of the first and second modulated wave signals. At the same time, the phase and address signal of the information signal to be recorded on the information signal recording disk are determined by the other paired recording system, and the address signal recorded by one recording system is combined with the address signal recorded by the other recording system. configured to be set to the same value.

Operation As described above, the first and second modulated wave signal recording systems are mutually phased on the standard time axis, and their respective address signals match, so the first and second modulated wave signals can be recorded. It is possible to prevent time and phase shifts from occurring when switching and recording. Furthermore, since the address signals are the same, random access etc. can be easily performed.

Embodiment FIG. 1 shows a block system diagram of an embodiment of a synchronization system for an information signal recording disk recording apparatus according to the present invention.

In the figure, the same components as in FIGS. 3 and 4 are designated by the same reference numerals. Further, in FIG. 1, the devices shown in each block are caused to operate in synchronization with a synchronization signal from a synchronization signal generator (not shown).

Here, the VTR 1 and analog recording track encoder 14 represent an analog signal recording system, while the VTRs 7, 8,
A digital processor 9, a 10° data synchronizer 11, and a digital recording track encoder 15 represent a digital signal recording system. The method of the present invention is characterized by establishing synchronization between the two recording systems mentioned above.
Here, in order to simplify the apparatus, the digital signal recording system is used as the master, while the analog signal recording system is used as the slave.

Further, FIG. 2 shows a time diagram of an example of the method of the present invention, and FIG. C) shows the second time code reproduced and output from the VTR 7, and (D) and (E) in the same figure show the second time code reproduced and output from the VTR 7, respectively.
8 shows a reproduction signal reproduced and outputted from 8.

In general, the size of the program area on the disc to be recorded is determined, so that, for example, the beginning of the program area is reached after four minutes from the outside of the group guard on the disc.

Now, when a "four-minute signal" is supplied from a starting device (not shown), VTRs 1, 7, and 8 are started simultaneously at time t1, and VTR 7 receives two channels of audio signals at a sampling frequency of 44°056kl-12. A signal consisting of, for example, digital data with a quantization bit count of 16 bits per sample point obtained by performing PCM transformation W (pulse code transformation W4) separately, an error check code, and an error correction code is a composite video signal. A signal inserted into the composite synchronization signal as a video period signal is frequency modulated and reproduces the magnetic tape prerecorded on the inclined track. On the other hand, the VTR 8, for example, uses a magnetic tape in which a 2-channel still image signal, which is component-encoded pixel data with 8 bits of quantization bits per sampling point, is frequency-modulated and recorded in advance on a tilted 1-rack. Reproduce. The VTRs 7 and 8 are operated synchronously based on a synchronizing signal from a data synchronizer 11, and frequency demodulate the reproduced signals of each two channels and supply the demodulated signals to digital processors 9 and 10, respectively.

Digital processors 9 and 10 are supplied with the frequency demodulated reproduction signal, and use the reproduced error checking code and error correction code to correct errors in the reproduced digital data and reproduced component encoded data of the video period, if any. , the digital processor 9 supplies the data synchronizer 11 with a two-channel digital audio signal with a sampling frequency of 44.056 kHz, and the digital processor 10 has an m-bit number of 8 bits. Two channels of pixel data are extracted at a sampling frequency of 88.112 kHz and supplied to the data synchronizer 11.

The data synchronizer 11 supplies the above input signal to the digital recording track encoder 15, generates and outputs a synchronizing signal based on the input signal, and causes the VTRs 7 and 8 to operate in synchronization. In this way, at time t2, VT
Synchronization of R7 and R8 is established. 1 The encoder 15 for digital recording track adds redundant bits to the four channels of digital data supplied from the data synchronizer 111, generates one block of signals in a predetermined signal format l-, and converts this into a block (frame). The second FM signal obtained by time-series synthesis at a transmission frequency of 44.056 kl-(z for each unit, and further frequency modulating a carrier wave of about 7 M I-1z with this synthesized digital signal) ' is supplied to the terminal i6a of the switch circuit 16.

On the other hand, the recorded magnetic tape 4- to be played back by the VTR 1
A frame lock signal with a two-frame period for determining the timing of the composite video signal and reference signal f'p3 described above is recorded on the inclined track of the master tape, and on the time code track, for example, US S
MPTE (3ociety or Motion P
1culture and T elevision E n
Gineers) standard time code is recorded. The first time code played from the time code 1-rack and the second time code played from the same time code track by the VTR 7 are each supplied to the synchronizer 17, 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 1 so that the master tape is played. As a result, at time t3, V
, TR1 are synchronized with VTRs 7 and 8.

Further, the frame lock signal reproduced from the inclined track of the master tape by the VTR 1 is supplied to the analog recording track encoder 14.

The analog recording track encoder 14 is set at time t3.
A certain number of frame lock signals of the two-frame period reproduced and outputted from the VTR 1 are counted, and the signal position is made to match the reference signal fP3, and at the same time, the timing signal is transferred to the digital recording track encoder at time t4. Output to 15. As a result, the address signal generated by the address generator built into the digital recording track encoder 15 is recorded in analog! - It is set to the same value as the address signal generated by the rack encoder 14, completing the address signal matching. This operation is performed in synchronization with the reference signal fp3.

The operation from time t1 to time t4 described above is the operation of the VTR 1.
, 7, 8 (master tape 2)
0) is executed outside the program area and does not affect the actual program recording.

Then, at time t5, the values of the address signals taken out from the encoders 14 and 15, which are identical as described above, become, for example, "0 minutes OO seconds" and "0 tracks", and recording of the program starts from this point. .

The analog recording track encoder 14 was developed by the present applicant in Japanese Patent Publication No. 58-23998 (Japanese Patent Application No. 52-2).
5262), etc., so a detailed explanation thereof will be omitted. However, the input color video signal is separated into a luminance signal and a carrier color signal, and the carrier color signal is separated into a high frequency region of the luminance signal. After performing low-frequency conversion, band-sharing multiplexing is performed on the band-limited luminance signal to generate 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 composite color video signal.
A time address signal ΔT and a page address signal AN are generated and multiplexed within each specific 1H period within the vertical blanking period of the above-mentioned composite color video signal, and a frequency-modulated audio signal is further added to this signal at a frequency of °C. The first FM signal is generated by frequency modulating a predetermined carrier wave with the signal obtained by division multiplexing, and this is supplied to the terminal 16b of the switch circuit 16.

Here, the address signal Ac is an address signal that indicates the signal recording position on the disk in the order of the recording program, the time address signal A is an address signal that indicates the total time, and the page address signal AN is the address signal that indicates the track to be formed by the rotation of the disk. The reference signal fP3 is an address signal indicating the number of tracks in one tree starting from the recording position, and each of these address signals is composed of 29 bits.

On the other hand, before the start of recording, the floppy disk drive Hid ( FD) is set to 18,
The control signal from this FD18 is sent to the central processing unit (CPU 1)
9.

The CPU 19 is supplied with the second time code reproduced by the VTR 7, and controls switching of the switch circuit 16 when the reference signal fP3 is input based on the control signal from the FD 18.

In this way, the first FM signal from the encoder 14 or the second FM signal from the encoder 15 selectively output by the switch circuit 16 is transmitted to the known optical recording device 3.
and are alternately recorded in different areas on the master disc 20 while maintaining continuity. By passing this master disk 20 through a known development process and a tJff)l process, a mixed disk having an electrode function and without a needle guide groove is manufactured.

In this embodiment, the system configuration is such that the digital signal recording system is the master and the analog signal recording system is the slave.
Contrary to the above, the system configuration may be such that the digital signal recording system is the slave and the analog signal recording system is the master, by configuring the system to output a timing signal.

Effects of the Invention As described above, according to the present invention, by matching the time codes and address signals of both the digital signal recording system and the analog signal recording system, synchronization of the three master tapes can be established, and the cutting date and time can be determined. This method has the advantage of being able to uniquely establish the address and information signal recording position on the disk regardless of the situation, and therefore providing a simple and stable synchronization method for recording mixed disks.

[Brief explanation of the drawing]

FIG. 1 is a block system diagram showing an embodiment of the synchronization method of the information signal recording disk recording device according to the present invention, FIG. 2 is a time diagram for explaining the operation of the block system shown in FIG. 1, and FIGS. The figures are block system diagrams showing examples of recording systems for conventional video discs and digital audio discs, respectively. 1.7.8...VTR13...Optical recording device, 4.
...Tracking signal generator, 9.10...Digital processor, 11...Data synchronizer, 14
... Analog recording track encoder, 15...
Encoder for digital recording track, 16... Switch circuit, 17... Synchronizer, 18... Floppy disk drive device ffi<FD), 19...
Central processing unit (CPU), 20... master.

Claims (1)

[Claims] A first modulated wave signal obtained by analog modulation with a first information signal including at least a composite video signal and a plurality of channels of digital data obtained by digital modulation with a second information signal are transmitted at a predetermined transmission frequency. Information signal recording disk recording in which a second modulated wave signal obtained by further modulating the time-series synthesized digital signal is recorded alternately in different areas on the same information signal recording disk while maintaining continuity. A synchronization method of a device, which is a standard time axis of one of the recording systems of the first and second modulated wave signals before the start of recording of the first and second modulated wave signals. At the same time, the phase of the information signal and the address signal to be recorded on the information signal recording disk are determined by the other recording system whose phase is adjusted to A synchronization method for an information signal recording disk recording device, characterized in that the address signal is set to the same value as the address signal.