JPS63129557A - Disk dubbing device - Google Patents

Abstract

PURPOSE:To directly perform the dubbing recording of an RF signal reproduced from a master disk side on a slave disk side and to suppress the lowering of an S/N and picture quality, by controlling a rotational phase on the slave side by using a reference signal fixed and delayed from the master disk side. CONSTITUTION:When the dubbing recording of information is performed from a master disk 17 to a slave disk 18, system controls 35 and 45 in a reproducing system and a recording system are connected via interface circuit 36, and bidirectional control is available. A dubbing connection signal (a) is inputted from the control 45 to a recording control circuit 32 and a reference signal control circuit 34, and the circuit 32 selects the RF signal inputted from a signal processing circuit 30, and outputs it to a laser driving circuit 33. Also, similarly, the circuit 34 selects a horizontal synchronizing signal inputted from a delay circuit 29, not the signal from a reference signal generation circuit 39, and outputs it to a motor control circuit 41. And a disk 18 is rotated fitting to a phase at the circuit 34 shifted by the delay time of the circuit 29 from the rotational phase of the disk 17.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disc dubbing method and a disc dubbing method capable of dubbing information signals recorded on a disc to another disc in a recording/reproducing disc device. It is related to the device.

[Conventional technology]

A conventional disc dubbing device of this type is described in, for example, Japanese Patent Laid-Open No. 59-8182. The disc dubbing device described in this publication synchronizes the rotational speed of two disc motors at a constant reference signal frequency, and selects in advance the track address where desired image information is written and the reproduction of the image information. After specifying the playback order, the specified track address and the address code signal detected from the first disk are sequentially compared, and when the two signals match, the head on the first disk is It is known that the feeding is stopped, the video signals recorded on the track are sequentially reproduced, and the reproduced video signals are automatically dubbed and recorded onto a second disc. Therefore, by first performing a predetermined setting operation, only a specific video signal among the video signals recorded on the first disc is automatically recorded onto the second disc in sequence. .

[Problem that the invention seeks to solve]

The above-mentioned conventional technology demodulates the FM-modulated video signal recorded on the first disk into a video signal, replaces the old track address signal of the demodulated video signal with a predetermined new track address signal, and then , which is FM-modulated again and then dubbed and recorded on the second disc.
When performing dubbing recording, it is necessary to demodulate the reproduced FM signal and then pass it through the modulation circuit again, which results in waveform distortion and deterioration of '/s when passing through the circuit system, resulting in poor image quality. There was a problem that a drop occurred.

Furthermore, in the conventional technology described above, a track address signal is superimposed on a video signal and recorded on a disc, but in disc devices capable of recording and playback, a method in which a track address signal is recorded on a disc in advance is mainstream. can be,
The above conventional technology does not take this method into consideration, and when dubbing recording is performed using a disk device using this method,
There was a problem in that track addresses were always recorded twice.

Furthermore, when dubbing recording is performed, two independent disk motors are simultaneously rotated at high speed, so time axis fluctuations caused by wow and flutter of the disk motors and eccentricity of the disk may affect the dubbed signal to a maximum of 2 times the normal playback. There is a possibility that this phenomenon can occur up to twice as much, and there is a problem in that when the dubbing recorded signal is reproduced, a large disturbance (skinny) occurs on the reproduced screen.

The purpose of the present invention is to eliminate the problems of the prior art described above,
When dubbing recording between discs, the signal is passed through a modulation and demodulation circuit to suppress signal degradation, duplicate recording of track address signals, and distortion of the playback screen (skinny) due to time axis fluctuation components. The object of the present invention is to provide a disc dubbing device that provides the following advantages.

[Means for solving problems]

The above purpose is to correct the deterioration of the modulated signal through the characteristic correction means while maintaining the modulated signal reproduced from the first disk without demodulating it, and to correct the time axis fluctuation component through the time axis fluctuation correction means. This is achieved by correcting the address signal component, removing the address signal component via the address signal removing means, and dubbing the signal onto the second disk. (b) Sometimes,
A reference signal (for example, a composite synchronization signal) output from the dubbing side is inputted to the dubbing side after passing through a fixed delay circuit, and is used as various synchronization signals.

[Effect]

The characteristic correction means, when recording a signal on the disk,
It corrects signal deterioration caused by the characteristics of the disc in terms of frequency, and has the function of suppressing signal deterioration during dubbing. The time axis correction means uses a variable delay element to change the delay time of the variable delay element according to the time axis variation component detected by the time axis variation component detection means, thereby suppressing the time axis variation of the signal. There is work. The address signal removing means suppresses redundant recording of address signals by removing address signal components previously recorded on the disk. Further, the fixed delay means is for correcting a fixed delay time that occurs when a signal passes through the variable delay element, and by passing a synchronization signal through the fixed delay means, the first disc dubbing can be recorded on the second disk in the same phase as the modulated signal recorded on the second disk.

〔Example〕

An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 2 shows an example of a recordable and reproducible optical disc. The disk 1 is provided with a grooved guide track 3 in advance during manufacture. An address area 2 in which an address signal unique to each guide track is recorded, and a rotation start mark 4 for generating a reference signal used for recording position alignment are formed in an uneven shape. In the figure, a concentric guide track 3 is shown, but a concentric guide track may also be used.

FIG. 3 shows a schematic diagram of the structure of the optical head 5 for recording and reproducing. In the figure, a light beam emitted from a laser diode 6 is collimated by a collimating lens 7, passes through a polarizing beam splitter 8° and a 174-wave plate 9, and is focused as a light spot onto a disk 1 by an objective lens 11 attached to an actuator 10. It will be done.

The reflected light from the disk 1 is again converted into parallel light by the objective lens 11 , passes through the quarter-wave plate 9 , is reflected by the polarization reflecting surface of the polarizing beam splitter 8 , and passes through the convex lens 12 . After that, the light beam is divided into two by the mirror 13,
One of the light beams passes through the concave lens 14 and enters the two-split light receiving element 15 for detecting focus errors, and the other light enters the two-split light receiving element 16 for detecting tracking errors, where they are photoelectrically converted.

FIG. 4 is a block diagram showing an embodiment of the disc dubbing apparatus according to the present invention. The diagram shown on the left half of the figure shows a block diagram of a playback device that plays back the master disk, and the diagram shown on the right half shows a block diagram of a recording device that dubs and records the information signal played back on the master disk to the slave disk. A block diagram is shown.

In the figure, 17 indicates a master disk, and 18 indicates a slave disk. 19.57 is a photosensor for detecting the rotation start mark 4; 20.38 is a waveform shaping circuit; 21.39 is a reference signal generation circuit for generating a horizontal synchronization signal of, for example, 15.7AHz; 22.40
is a disc motor, 23.41 is the disc motor 22
This is a disk motor control circuit for maintaining the rotation angle at a high speed of 180 rpm. Also, 24.42
25.43 is a preamplifier circuit for amplifying the signal photoelectrically converted by the optical head 5; and 25.43 is a focus control for accurately focusing the original spot narrowed down by the objective lens 11 on one surface of the disk. circuit, 26.
Reference numeral 44 denotes a tracking control circuit for causing the original spot imprinted on the disc 1 to follow the guide track 3;
7 is an RF signal detection circuit, 28 is an address signal detector 1111
! ! 29 is a delay circuit for delaying the reference signal by a fixed delay time; 30 is the preamplifier circuit 24;
A system that performs processing to demodulate the RF multiplied signal video signal amplified by @! This is a reproduced signal processing circuit having a system that performs address removal processing without adding data.

Further, 31 is a recording signal processing circuit for FM modulating the input video signal and converting it into an RF signal, and 32 is a recording control circuit for switching the output recording signal between dubbing recording and normal recording/playback. 53 is a laser drive circuit for driving a laser according to a modulation signal that is intensity-modulated with an input RF signal; 54 is a reference signal control circuit that switches the output reference signal between dubbing recording and normal recording/playback; 55
．． 45 is a microcomputer.

A system control 36 is composed of a memory, etc., and is an interface circuit for control signals when dubbing recording is performed.

The operation of the reproduction system will be explained below.

The reproduction signal reproduced from the master disk 17 via the optical head 5 is amplified by the preamplifier 24, and then the high frequency components (several tens of KHz or more) are sent to the reproduction signal processing circuit 30. R
F signal detection circuit 27. The address signals are input to the demodulation circuit 28, and the low frequency components (several tens of kHz or less) are input to the focus control circuit 25. The signal is input to the tracking control circuit 26.

The reproduced signal processing circuit 30 performs time axis correction on the high frequency components of the reproduced signal, which will be explained in detail later, and then converts the video signal outputted to a monitor or the like and the R outputted to the recording control circuit 32.
Divide into two F-fold signals. At this time, the RF multiplied signal outputted to the monitor etc. is subjected to processing such as FM demodulation and converted into a video signal, but the RF multiplied signal outputted to the recording control circuit 62 is not subjected to demodulation processing. Perform address removal processing and output.

Further, the RF signal detection circuit 27 determines whether the track currently being reproduced is a recorded track or an unrecorded track, and a detection signal is input to the system control 35.

Further, the address signal demodulation circuit 28 extracts only the address area 2, demodulates it into digital data, and outputs it to the system control 35.

On the other hand, the focus control circuit 25 and the tracking control circuit 26 perform a servo operation for causing the light spot to follow the guide track 3 in response to a human input signal.

Next, the motor control circuit 23 uses the phase of the 15.7 kHz horizontal synchronizing signal outputted from the reference signal generation circuit 21 and the rotation start mark signal detected by the photosensor 19 and the waveform shaping circuit 20 every rotation of the disk. By matching the phases, the disk motor 22 is driven so that the rotational phase of the master disk 17 is constant.

It's in control. Further, the reference signal is input to a delay circuit 29 having a fixed delay time equivalent to the delay time that occurs when the reproduced RF signal passes through the reproduced signal processing circuit 30, and is delayed by several tens of microns. The signal is input to the reproduced signal processing circuit 50 and the reference signal control circuit 64.

Next, the operation of the recording system will be explained.

Similarly to the reproduction system, the optical head 5 is transferred from the slave disk 18.
The reproduced signal is amplified by the preamplifier 42, and then the low frequency component is sent to the focus control (b) path 43.
and tracking control circuit 44, respectively.

Thereby, the control circuits 45 and 44 perform a predetermined servo operation so that the light spot follows the guide track 3 with high precision.

Furthermore, the motor control circuit 41 controls the slave disk 18 by matching the phase of the horizontal synchronization signal output from the reference signal generation circuit 39 with the phase of the rotation start mark signal detected by the photosensor 37 and the waveform shaping circuit. The disc motor 40 is driven and controlled so that the rotational phase of the disc motor 40 is constant.

On the other hand, when a video signal (for example, an NTSC signal) is input from the outside to the recording signal processing circuit 31, the recording signal processing circuit 51 performs FM modulation on the input signal, and then sends it to the recording control circuit 32.
The signal is input to the laser drive circuit 55 via.

The laser drive circuit 33 intensity-modulates the output light of the laser diode 6 incorporated in the optical head 5 according to the input FM signal while the recording start/end signal input from the system control circuit 45 is at a noy (or low) level. The intensity-modulated output light irradiates the slave disk 18, and information is recorded as a change in reflectance at the irradiated point on the disk 18.

Next, from the master disk 17 to the slave disk 18
The operation when dubbing and recording an information signal will be explained. The playback system control 35 and the recording system control 45 are connected to the interface circuit 3.
6, and bidirectional control is performed.

A dubbing connection signal (,) is sent from the recording system control 45 to the recording control circuit 32 and the reference signal control circuit 3.
4, the recording control circuit 32 detects that there is no RF flaw signal input from the recording signal processing circuit 31 and the RF flaw signal is input from the reproduction signal processing circuit 30 to the laser drive circuit 35.
A simple switching operation selects the signal to be output.

Similarly, the reference signal control circuit 64 controls the reference signal generation circuit 5
Delay circuit 29 rather than the horizontal synchronization signal input from 9
A signal is selected to be output to the motor control circuit 54, which is the horizontal synchronization signal input from the motor control circuit 54. As a result, the motor control circuit 54 adjusts the rotational phase of the slave disk 18 to a phase shifted by the delay time of the delay circuit 29 from the rotational phase of the master disk 170.

When recording in the moving image mode, first, the master disk 17 side reproduces a still image from the first track of the information signal, and the slave disk side reproduces a still image one track before the recording start track. The rotation start mark signal detected by the photosensor 37 is input to the system control 45 via the waveform shaping circuit 38, and in synchronization with the rotation start mark signal, the playback mode on the master disk side and the slave disk side is changed to video mode. Switch to At the same time, the recording start/end signal Cb) input from the system control 45 to the laser drive circuit 35 is low (or) 1.
b) Level is high (or low) and dubbing recording to the slave disk 1B is started.

Thereafter, the system controller 45 counts the rotation start mark signal detected each time the disk rotates.
When the designated track is reached, the recording start/end signal (h) changes from the noi (or low) level to the low (or -i) level, and recording to the slave disk ends.

Also, to simplify the explanation, here we have explained the playback system (master side) and the recording system (slave side) separately, but it is not necessary that the master side is a playback device and the slave side is a recorder. The same goes for dubbing recording between recording and reproducing devices.

FIG. 1 shows the reproduced signal processing circuit 30 surrounded by the dotted line in FIG.
FIG. Each input/output signal and each block diagram will be explained below.

The signal (-) in the figure is a control signal input from the system control 55, the signal Q) is a reproduction RF signal input from the preamplifier circuit 24, the signal 0) is a horizontal synchronization signal input from the delay circuit 29, and the signal ( A) is the recording control circuit 52
The dubbing RF signal outputted to the dubbing signal (L) indicates a reproduced video signal outputted to a monitor or the like.

Next, 46 is an equalizer circuit (hereinafter abbreviated as EQ circuit) for correcting the characteristics of the reproduced RF signal Q), and 47 is an equalizer circuit for correcting the characteristics of the reproduced RF signal Q), and 47 is for correcting jitter (time axis fluctuation) components caused by wow and flutter of the disk motor or disk eccentricity. A variable delay element in the RF signal band for correction, such as a time base collector circuit (hereinafter abbreviated as TBC circuit), 48 an address signal removal circuit, 49 an FM demodulation circuit, 50 a dropout detection circuit, and 51 a dropout circuit. This is an out compensation circuit. Further, 52 is a video signal AMP circuit, 53 is a 5YNC5EPA circuit that extracts only the synchronization signal from the video signal, and 54 is the horizontal synchronization signal 0) and the 5YNC5EPA circuit.
A phase detection circuit for comparing the phases of the synchronization signals output from the circuit 53 and detecting a phase error is shown.

Next, the reproduced signal processing circuit 30 having the above configuration
The operation will be explained.

Control signal (#) from system control 35 EQ
The signal is input to the circuit 46 and the TBC circuit 47, and the control signal (-) is set to be at a high (or low) level during dubbing and to be at a low (or high) level during normal playback. Furthermore, the EQ circuit 46 and the TBC circuit 47 are each set with different characteristics of the 2's class, and the characteristics during dubbing and during normal reproduction are respectively switched by the control signal (-).

When dubbing recording is started, the RF multiplied signal j) input to the EQ circuit 46 is corrected with the EQ characteristic for dubbing, and then input to the TEC circuit 47, and the jitter component is removed by the TBC servo characteristic for dubbing. and FM demodulation circuit 4
9. Dropout detection circuit 50. and address signal removal circuit 48, respectively.

The FM demodulation circuit 49 demodulates the input RF multiplied signal video signal and outputs it to the dropout compensation circuit 51.

On the other hand, the dropout detection circuit 50 detects RF multiplied signal dropout (signal loss) using a well-known frequency detection method or the like, and outputs the detected signal to the dropout compensation circuit 51. The dropout compensation circuit 51 performs dropout compensation of the video signal by replacing only the dropout detection period with a signal from 1H before, and the compensated video signal is further transmitted to the AMP circuit 52 and 5YNC5.
The signal is input to the EPA circuit 53.

The AMP circuit 52 amplifies the video signal and outputs it to a monitor, etc., and the 5YNC5EPA circuit 55 extracts only the synchronization signal and outputs it to the phase detection circuit 54. Phase detection circuit 5
4, a phase error corresponding to the jitter component of the reproduced signal is detected as described above, and is used as an error signal for the TEC circuit 47.

The TBC circuit 47 removes the jitter component from the RF multiplied signal, and the address signal removal circuit 48 removes the high-frequency component using a low-pass filter or the like during the output period of the address signal, thereby converting the signal into a DC component.

This makes the address signal period a dropout period.

Furthermore, after the signal component of the address signal period is removed by the address signal removal circuit 48, the RF multiplied signal h> is outputted to the recording control circuit 32 and subjected to the predetermined dubbing process as described above.

In the above embodiment, the reference signal on the master side is delayed to match the rotational phase on the slave side, but this is not necessarily applied only to RF double signal dubbing recording.
It also applies to dubbing recording of other signals such as video signals. Further, in the above embodiment, the EQ circuit 46 and TB
By sharing the C circuit 47 in the normal reproduction mode and the dubbing recording mode, there is an effect that the configuration is simplified.

〔Effect of the invention〕

According to the present invention, by controlling the rotational phase of the slave disk using a reference signal that is fixedly delayed (several tens of microseconds) from the master disk, the RF multiplied signal reproduced from the master disk is directly transmitted to the slave. Since dubbing recording can be performed on the disk side, it is more effective in suppressing S/N deterioration or image quality deterioration than dubbing recording of video signals.

Further, by operating the dropout compensation circuit without fail during the period in which the address signal is output, there is an effect of preventing duplicate recording of the address signal.

Furthermore, a variable delay line capable of passing an RF multiplied signal, that is,
By using the TBC circuit, it is possible to eliminate jitter components caused by motor wow-flash or disk eccentricity.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of a reproduced signal processing circuit of the present invention, FIG. 2 is an overview diagram showing an example of a disk, and FIG. 3 is a block diagram showing an example of an optical recording/reproducing device used in the present invention. 4 are block diagrams showing an example of a disc dubbing recording apparatus of the present invention. 1 ・・・・・・・−・・・・・・・・・Disk 2・・・・・・
・−・・・・・・・・・Address area 3・・・・・・・・・
・・・・・・Guide track 4・・・・・・・・・・・・
...Rotation start mark 5...
・Optical head 6...Laser diode 15, 16...Two-split light receiving element 17...
-・・・・・・・・・・・・Master disk 18...
・・・・・・・・・・・・ Slave Tisk 19.57
...Photo sensors 20, 38...Waveform shaping circuits 21, 39...
...Reference signal generation circuit 22.40...Disc motor 23.41...Disk motor control circuit 24.42...Preamplifier circuit 29...
・・・－・・・・・・・・・Delay circuit 30・・・・・・・・・
--- Reproduction signal processing circuit 31 ---
... Recording signal processing circuit 32 ......
- Recording control circuit 33...
・Laser drive circuit 34...Reference signal control circuit 35, 45...System control 56...Control Signal interface circuit 46...
・Equalizer circuit 47・・・・・・・・・・・・・・・
Time pace collector circuit 48...
...Address signal removal circuit 49...
...FM demodulation circuit 50...
...Dropout detection circuit 51...
...Dropout compensation circuit 53...
......-5YNC5EPA circuit 54...
・・・・・・・・・Phase detection circuit (α)・・・・・・
......Dubbing connection signal (b)...
・・・・・・－・・・Recording start/end signal (-)・・・・・・
・・・・・・−・Control signal ω・・・−・−・・・・・・
・・Reproduction RF signal 0)・・・Horizontal synchronization signal (A)・・・・・・・・・・RF signal for dubbing (j)・・・・・・・・・・・・・−・Playback video signal agent Patent attorney Masao Ogawa 2nd day

Claims (1)

[Claims] 1. A reproducing means for reproducing an information signal written on a first disk into an electric signal, and a recording means for recording the information signal converted into an electric signal on a second disk. A disc dubbing device comprising: a reproducing means for reproducing the information signal modulated and recorded on the first disc; and a reproducing RF signal reproduced by the means, correcting the time axis of the reproduced RF signal as the modulated signal. an output means for outputting an output, a recording means for recording a signal input from the means on a second disk, and a rotation synchronization means for synchronizing the rotational speed and rotational phase of the first disk and the second disk. and after synchronizing the first disk and the second disk with the rotation synchronization means, the information signal recorded on the first disk is recorded on the second disk. A disc dubbing device featuring: 2. In the disc dubbing apparatus according to claim 1, the output means includes a variable delay element that can pass an RF signal band, and a time axis included in the information signal reproduced by the reproduction means. It has a time axis variation detection means for detecting a variation component, and changes the transit time of the information signal passing through the variable delay element according to the time axis variation component detected by the time axis variation detection means. A disc dubbing apparatus characterized in that the time axis fluctuation component is corrected and outputted to the recording means. 3. In the disc dubbing apparatus as set forth in claim 1, the output means includes characteristic correction means for correcting characteristic deterioration of the reproduced signal caused by the disc and the light beam passage area, A disc dubbing apparatus, characterized in that the information signal reproduced by the reproduction means is output to the recording means after passing through the characteristic correction means. 4. In the disc dubbing device set forth in claim 2, when the information signals recorded on the first disc are simultaneously recorded on the second disc in real time, the rotational phase of the first disc A rotational phase delay means is provided so that the rotational phase of the second disk is always delayed by a constant phase, and the phase delay is equal to a fixed delay time that occurs when passing the information signal to the variable delay element. A disc dubbing device characterized by: 5. In the disc dubbing apparatus as set forth in claim 2 or 3, a dubbing mode discriminating means for discriminating between a dubbing recording mode and a normal playback mode is provided, and the discrimination made by the dubbing mode discriminating means is provided. A disc dubbing device characterized in that a signal is output to the variable delay element and the characteristic correction means so that the correction characteristics are different during dubbing recording and normal playback. 6. In the disc dubbing apparatus as set forth in claim 1, the output means includes address signal removal means for removing only the address signal component from the information signal reproduced by the reproduction means, and the A disc dubbing apparatus characterized in that the information signal reproduced by the reproduction means is output to the recording means after passing through the address signal removal means.