JPH0789425B2 - Information recording device and recording disk - Google Patents

Description

The present invention relates to an information recording apparatus and a recording disk for recording a plurality of related information signals on a recording disk by a plurality of optical recording heads.

A recording disk (video disc) optically recording a video signal and an audio signal, a recording device (VDR) and a reproducing device thereof are already known. First, a conventional VDR will be described with reference to FIG. In the figure, (1) is a video signal generator, (2) is an FM modulator (including a carrier wave generator), (3)
Is an optical modulator, and (4) is an argon laser. (twenty one)
Is an audio signal generator, (22) is an audio FM modulator (including a carrier wave generator), and the output of the FM modulator (22) is for video
It is supplied to the optical modulator (3) together with the output of the FM modulator (2). The light beam from the argon laser (4) is turned on and off in the light modulator (3) according to the frequency (FM frequency) of the output signals of the FM modulators (2) and (22). (5) is a color lock composite sync signal generator, (6) is a rotary servo circuit, (7) is a motor, (8) is a turntable,
(9) is a recording disk (video disk). The rotary servo circuit (6) synchronizes with the frame of the video signal, for example,
Rotate the motor (7) at 1800r.pm. (10) is an optical recording head, which has a predetermined feed pitch (for example, 1.6 μm) so that the track pitch is aligned in the radial direction on the video disk (9) by a head feed mechanism (not shown).
μm). The light beam turned on and off by the optical modulator (3) travels along the optical path by the mirror (11) of the optical recording head (10).
It is changed by 90 °, diffused by the concave lens (12) and focused and forms a pit on the video disk (9) via the recording lens (13). The light beam from the helium neon laser (14) provided in the head feeding mechanism is diffused by the concave lens (16) through the beam splitter (15), and the optical path is changed by 90 ° by the half mirror (17) for recording. It passes through the lens (13) and hits the video disc (9) to be reflected. The reflected return beam passes through the recording lens (13), the half mirror (17) and the concave lens (16) again, and the beam splitter (1
The light path is changed by 90 ° by 5) and the light is detected by the photodetector (18). The output of the photodetector (18) is applied as a servo signal to the focus servo circuit (19), and the recording lens (13) is arranged so that the light beam from the argon laser (4) is focused on the video disk (9). Control the position of.

Next, with reference to FIG. 2, a configuration example of a conventional video disc reproducing apparatus is shown. In the figure, (6P) is a rotary servo circuit, (7P) is a motor, and (8P) is a turntable.
(9R) is a video disc, which is the disk (9) itself recorded by the apparatus of FIG. 1 or a copy thereof.

(30) is an optical reproducing head, which is a semiconductor laser (3
The light (having a longer wavelength than the recording light) from 1) is collimator lens (32), polarized beam splitter (33), quarter wave plate (3)
4), tracking mirror (35t), jitter mirror (35
disc (9R) through the objective lens (36)
Focus on the pit. The return beam from the disk (9R) passes through the same optical path again, the optical path is changed by 90 degrees by the beam splitter (33), and it is guided to the photodetector (38) through the converging lens (37) and converted into an electric signal. To be converted.

The AM component of the output of the photodetector (38) is supplied to the servo mechanism (39) as a servo signal, and the tracking mirror (35
t), the jitter mirror (35j) and the lens (36) are properly controlled, and the output of the servo mechanism (39) is the terminal (39T).
Is supplied to a head feed mechanism (not shown) to control the feed of the head (30).

The RF output of the photodetector (38) is supplied to the demodulator (40), and the video output terminal (40V) and audio output terminal (4
Demodulated video signal and demodulated audio signal are respectively taken out from 0A).

By the way, in the conventional VDR as described above, the FM video signal and the FM audio signal related to the FM video signal are added and multiplexed and recorded.

Therefore, if the occupancy of the pulse signal deviates from 50%, the audio signal may appear in beats on the reproduction screen, and the quality of the reproduced image may be impaired.

In view of such a point, an object of the present invention is to obtain a high-density recording disk by dividing related information signals into two and averaging different track information amounts for recording.

An embodiment of the information recording apparatus and the reproducing apparatus according to the present invention will be described below with reference to FIGS.

FIG. 3 shows the configuration of an embodiment of the information recording apparatus according to the present invention.
FIG. 4 shows the structure of the main part. In both figures, the portions corresponding to those in FIG.

In both figures, (102) is a Y / C separation circuit, (103) and (1
Each of 04) is an encoding circuit, and the video signal from the video signal generator (1) is separated into a luminance signal Y and a chrominance signal C in a Y / C separation circuit (102). The luminance signal Y is mixed with the frame number signal from the frame number signal generator (5F) in the mixer (101), and then the encoding circuit (10
It is digitized in 3) and supplied to the modified FM circuit (201). The output of the modified FM circuit (201) is supplied to the image optical modulator (3). On the other hand, the color signal C is transmitted to the encoding circuit (10
It is encoded in 4) and supplied to the modified FM circuit (105). The outputs of the color signal modified FM circuit (105) and the audio modified FM circuit (221) are mixed in a mixer (222) and supplied to an optical modulator (23).

Fifth Example of Information Reproducing Device for Reproducing Recording Disc of Present Invention
Shown in the figure. In the figure, parts corresponding to those in FIG. 2 are designated by the same reference numerals, and duplicate description will be omitted.

In FIG. 5, (47) and (48) are decoders, respectively, and the decoder (47) is supplied with the output of the video demodulator (41) and outputs the luminance signal Y. The decoder (48) is supplied with the output of the audio demodulator (42) and outputs the color signal C and the audio signal. The luminance signal Y and the color signal C are mixed by the mixer (49) and supplied to the monitor (43), and the audio signal is supplied to the monitor (44).

Generally, the information amount of the audio signal is much smaller than the information amount of the video signal, but since the luminance signal Y, the color signal C and the audio signal are recorded in different tracks in this embodiment, The amount of information to be recorded on each track is averaged. Therefore, the recording density of each track is averaged, and the recording density increases as a whole of the recording discs, and it is possible to reproduce a good quality image and sound.

Next, another embodiment of the present invention will be described with reference to FIGS. 6 and 7.

In the recording apparatus shown in FIG. 6, (7A) and (7B) are motors, (8A) and (8B) are turntables, (9A) and (9
B) is a recording disk. Both motors (7A) and (7B) are controlled by the rotation servo circuit (6) and rotate in opposite directions in synchronization with the frame of the video signal. Signals are recorded on both recording disks (9A) and (9B) by optical recording heads (10) and (50) arranged equidistant from the center of each disk. It is similar to the example.

The two disks (9A) and (9B), or their duplicates, which have been recorded, have their rear surfaces stuck together and are reproduced by a reproducing apparatus as shown in FIG. In Figure 7, (9D)
Is a double-sided video disc as described above, and is appropriately rotated by a drive mechanism (not shown). Both optical reproducing heads (30) and (60) are arranged symmetrically with respect to the disk (9D).

In addition to the above-mentioned embodiment, each signal can be processed appropriately, and FIG. 8 shows an example thereof.

In FIG. 8, unlike the embodiment of FIG. 3,
A frame number signal is inserted into the color signal and the audio signal, which have been encoded by the encoding circuits (104) and (213), respectively, and are supplied to the modified FM circuit (221).

Further, the luminance signal Y and the chrominance signal C are separated, a frame number signal is inserted into both of them, and an audio signal is combined with either of them, and each is converted into FM and supplied to different optical modulators. Record in different areas of the same recording disk,
Alternatively, they can be recorded on separate recording disks. In any of these cases, a beat does not occur and a good quality image can be reproduced.

As described above, in the present invention, the video signal is separated into the luminance signal and the chrominance signal, the audio signal is added to this, and the signals are supplied to different optical modulators and recorded on the recording disk. A frame number signal is inserted in each signal for synchronous reproduction. Also, many modifications can be made to the processing and insertion position of the frame number signal.

In the recording signal processing system illustrated in FIG. 9, the frame number signal (digital pulse) from the frame number signal generator (5F) is combined with the FM voice signal from the FM modulator (22) in the mixer (225). After being superimposed, the amplitude limiter (226)
The amplitude is limited by and becomes a PWM signal.

During reproduction, in the synchronous control system illustrated in FIG. 10, the output of the video demodulator (41) is the frame number signal sampling circuit (45
1) and the output of the voice demodulator (42) is also supplied to the bandpass filter (452). The video section frame number signal output from the sampling circuit (451) and the audio section frame number signal output from the filter (452) are compared in a digital comparator (453), and the output of the comparator (453) is a servo circuit. The position of the reproducing head including the image reproducing head and the sound is controlled so that the image signal and the audio signal can be synchronously reproduced.

Further, as shown in FIG. 11 and FIG. 12, in the recording signal processing system, the frame number pulse is immediately FM-converted, or a sync signal is added to form a pseudo video signal and then FM-converted to an FM-converted audio signal. It is also possible to mix.

The frame number signal is inserted in the back porch of the video signal, but it can also be inserted in the vertical blanking period as shown in FIG.

That is, as shown in FIGS. 13A and 13B, in both the odd field and the even field, the frame number signal FN is inserted immediately after the end of the vertical synchronization period including the equalization pulse, and in the case of the even field, the blanking period ends. Previous 280H and 281H
It is also inserted in the period. Frame numbers are F00001 to F799
The range is 99, and the waveform is as shown in FIGS. In addition, CN in the figure A is a chapter number,
The range is 801DDD to 879DDD, and PS is the picture stop signal (82CFF). Further, WF in FIG. 9B is a white flag signal.

As described above in detail, according to the present invention, the video signal is separated into the luminance signal Y and the color signal C, and at least one of them is combined with the audio signal to average the information amount on different tracks of the recording disk. Since recording is performed as described above, a high-density recording disk can be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration example of a conventional recording device, FIG. 2 is a block diagram showing a configuration example of a conventional reproducing device, and FIG.
FIG. 4 is a block diagram showing an embodiment of an information recording apparatus according to the present invention, FIG. 4 is a block diagram of a main portion thereof, and FIG. 5 is a block diagram showing an example of an information reproducing apparatus for reproducing a recording disk of the present invention. FIGS. 6 and 8 are block diagrams showing examples of information recording, FIG. 7 is a block diagram showing another example of the information reproducing apparatus for reproducing the recording disk of the present invention, and FIGS. 9 to 12 are FIG. 13 is a block diagram for explaining the present invention, and is also an explanatory diagram. (1) is a video signal generator, (2) and (22) are FM modulators, (3) and (23) are optical modulators, (5) and (5G) are synchronization signal generators, and (5F) is Frame number signal generator,
(9), (9A), (9B), (9D) and (9R) are recording disks, (10) and (50) are optical recording heads, (30) and (60) are optical reproducing heads, and (40) , (41) and (42) are demodulators, (45) is a synchronous control circuit, and (102) is a Y / C separation circuit.

Claims (2)

[Claims] 1. A first and second information signal generator which divides a video signal into information signals of a luminance signal Y and a color signal C and encodes them into digital signals to generate first and second information signals, respectively. A third information signal generator for encoding a voice signal into a digital signal to generate a third information signal, and a sync control signal generator for generating a sync control signal for the video signal and the audio signal, A first recording signal which has the synchronization control signal and which is obtained by modulating one of the first and second information signals is a first recording signal.
A first optical recording head for recording on a track; the third information signal having the synchronization control signal;
Alternatively, a second optical recording head for recording a second recording signal, which is obtained by mixing and modulating the other information signal of the second information signals, on the second track, is provided. An information recording device characterized by recording on a track. 2. A first track in which a video signal is divided into information signals of a luminance signal Y and a color signal C, and a signal containing one of the luminance signal Y or the color signal C and a synchronization control signal is recorded, A second one in which the other of the luminance signal Y or the color signal C and the audio signal including the synchronization control signal are mixed and recorded.
A recording disk, which is equipped with a track.