JPS62291751A - Information reproducing device - Google Patents

Abstract

PURPOSE:To reproduce three kinds of recording media by using a 1st reproducing device so as to reproduce a 1st recording medium, giving its reproducing signal to a 2nd reproducing device reproducing a 2nd recording medium and outputting the signal from a 2nd reproducing device so as to have only to slight change to two sets of the reproducing devices. CONSTITUTION:Equalizers for servo circuits 26, 27 are switched by switching a changeover circuit 25 in using a CAV disk or a CLV disk. When no changeover means 34 is switched, a controller 24 controls an amplifier circuit 28 to select a reproducing signal from a pickup 23. Thus, a reproducing signal from a video disk 21 is outputted to a speaker as a left/right stereo signal. In outputting the reproduced RF video signal of a compact disk 1 from a video disk player 42, the changeover means 34 is operated and the controller 24 controls the servo circuits 26, 27 via a changeover circuit 25 to inhibit the drive of a motor 22 and the operation of the pickup 23.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an information reproducing device typified by a so-called compact disc player and a video disc player.

[Summary of the invention]

In the present invention, video information recorded on a compact disc is played back by a compact disc player, demodulated and output by the video disc player.

[Background technology]

On a so-called compact disc, audio information is converted into PCM, EFM modulated, and recorded.

On the other hand, video information and audio information are frequency-multiplexed and recorded on an optical video disk. Since the former was developed for recording and reproducing mainly audio information and the latter mainly for video information, their standards are different from each other.

However, recently there has been a demand for recording video information on compact discs and recording PCM audio information on video discs, and the latter has already been realized. When recording video information in addition to audio information on a compact disc as in the former case, the video information requires a wider frequency band than the audio information, so it is best to record the compact disc in the first area, which is relatively inner. , and a relatively outer second area, the first area records only audio information, the second area records audio information and video information, and the second area records the first area. It is conceivable to rotate the disk at a higher speed than in the region of .

FIG. 3 is a block diagram of a playback device conceivable for playing back a compact disc in which video information is added to audio information.

A compact disc 1 is rotated by a motor 2. The pickup 3 irradiates the disc 1 with laser light and reproduces recorded information from the reflected light. In the lead-in area at the innermost circumference of the disc 1, an identification signal is recorded as TOC information to distinguish between a disc on which only audio information is recorded and a disc on which video information is recorded in addition to audio information. ing. The TOC information is read out prior to the start of the playback operation and stored in the memory of the controller 4, which is comprised of a microcomputer or the like.

The detection circuit 5 outputs a detection signal to the controller 4 when detecting the video information recording area. At this time, the controller 4 controls the servo circuit 7 and the servo circuit 8 via the switching circuit 6, so the servo circuit 7 rotates the motor 2 at a higher speed than in the audio information recording area, and also rotates the equalizer at a lower speed. Switch from normal mode to high speed mode. Further, the servo circuit 8 switches the equalizers of the focus servo of the pickup 3, the tracking servo, and the carriage servo for moving the pickup 3 in the disk radial direction from low speed to high speed.

The reproduced RF signal output from the pickup 3 is input to a sampling circuit 9 and a sampling circuit 10, where the audio signal and video signal are separated and extracted.

The audio RF signal extracted by the extraction circuit 9 is input to a demodulation circuit 11, where EFM demodulation and PCM demodulation are performed. For this demodulation, a reference clock of a predetermined frequency is supplied from the clock generation circuit 13 to the demodulation circuit 11.

The clock generation ε path 13 is composed of, for example, a voltage-controlled crystal oscillator or the like, and outputs a reference clock with a predetermined fixed frequency in the audio information recording area, but changes the frequency of the reference clock in the video information recording area. . This is due to the following.

That is, the servo circuit 7 controls the rotation of the motor 2 in response to the error signal between the reproduced clock signal extracted from the reproduced PCM audio data by the demodulation circuit 11 and the reference clock signal in the audio 1st broadcast 1st record area. ing.

On the other hand, in the video information recording area, the demodulation circuit 14 frequency-demodulates the reproduced RF video information supplied from the sampling circuit 10, and extracts the horizontal synchronization signal contained therein and the reference horizontal synchronization signal supplied from the synchronization signal generation circuit 16. An error signal with respect to the signal is generated, and the rotation of the motor 2 is controlled in response to this error signal. The frequency ratio of the clock signal for audio information and the horizontal synchronization signal for video information does not have a simple integer relationship.

Therefore, the rotation of the disc 1 is controlled so that the video information is correctly reproduced in the video area.

Accumulation of time axis errors occurs in audio information.

Therefore, in the video domain, the frequency of the reference clock is changed in accordance with the error signal based on the horizontal synchronization signal, and for convenience, the audio signal is outputted while matching the time axis of the video signal.

The audio digital data read out from the demodulation circuit 11 in accordance with the reference clock in this way is transferred to the D/A
It is converted into an analog signal by the conversion circuit 12 and output to a speaker (not shown) or the like.

Further, the video information demodulated by the demodulation circuit 14 has its horizontal synchronization signal and color burst signal sent to the time axis correction circuit 14.
5, the reference horizontal synchronizing signal and the reference color burst signal outputted from the synchronizing signal generating circuit 16 are compared, and the time axis error is corrected in accordance with the error signal, and the corrected signal is output to a CRT or the like (not shown).

[Problem that the invention seeks to solve]

As described above, the compact disc player having the above-mentioned configuration requires almost the same circuit configuration as an optical video disc player, and has the drawback of significantly increasing cost.

Another drawback was that the audio information was not played back in real time, leaving an unnatural feeling.

[Means for solving problems]

The present invention is characterized in that the first information is recorded in the first area and the second area, or the first information is recorded in the first area and the first information and the second information are recorded in the second area. a first reproducing device for reproducing a first recording medium on which information is recorded; and a second reproducing device for reproducing a second recording medium having a different standard than the first recording medium on which second information is recorded. In the information reproducing apparatus, the first reproducing apparatus includes a detection circuit that detects a second area of the first recording medium, and a detection circuit that extracts the second information from the reproduced information of the first recording medium. a sampling circuit; an output terminal for outputting the second information extracted by the sampling circuit to a second reproduction device; and when the detection circuit detects the second area;
and a switching circuit for switching an equalizer of a servo circuit that drives the first recording medium, and the second reproducing device has an input terminal to which second information is input from an output terminal of the first reproducing device.

selection means for selecting one of the second information reproduced from the second recording medium and the second information supplied from the input terminal; and the second information supplied from the input terminal and the second recording. The apparatus is characterized by comprising a demodulation circuit that demodulates information selected by the selection means from among the second information reproduced from the medium.

[Effect]

The first recording medium is played back by the first playback device, and the playback signal is sent to a second playback device that plays back the second recording medium, and is output from the second playback device.

〔Example〕

FIG. 1 is a block diagram of an information reproducing apparatus according to the present invention, and parts corresponding to those in FIG. 3 are given the same reference numerals. In the present invention, a compact disc player 41 and an optical video disc player 42 are each independent.
and will be prepared.

The compact disc player 41 does not have the demodulation circuit 141, time base correction circuit 15, and synchronization signal generation circuit 16 in the apparatus shown in FIG. RF output by sampling circuit IO
A video signal, an analog audio signal output from the D/A conversion circuit 12, and a timing signal output from the controller 4 are transmitted from the output terminal 43 of the compact disc player 11 to the input terminal 4 of the video disc player 42.
4 via a connection cord or the like. Also, the output terminal 43 is also connected to share the ground potential.
and the input terminal 44.

In the optical video disc player 42 , 21 is a video disc which is rotated by a remoter 22 . 23
is a pickup that irradiates the video disc 21 with laser light and reproduces recorded information from the reflected light. 24 is a controller consisting of a microcomputer or the like, and controls various circuits, means, etc. 26 is a servo circuit that controls the rotation of the motor 22, and 27 is a servo circuit that controls focusing, tracking, and movement (carriage) in the disk radial direction based on the reproduction signal of the pickup 23. The equalizer for the servo circuits 26 and 27 is C
When using an AV disc and a CLV disc, switching is possible by switching the switching circuit 25.

Reference numeral 28 denotes an amplifier circuit as a selection means, which selectively amplifies the reproduced signal from the pink-up 23 and the input signal from the input terminal 44. Amplification circuit 28 supplies the RF video signal to demodulation circuit 29 . The demodulation circuit 29 demodulates the frequency of the video signal and outputs the CR (not shown) via the time axis correction circuit 30.
Output to T etc. The synchronization signal generation circuit 31 consists of a voltage-controlled crystal oscillator, etc., and generates a reference horizontal synchronization signal, a reference color verse!・Generate a signal. The demodulation circuit 32 receives the input F
The M audio signal is frequency demodulated and output to a speaker (not shown) or the like. 33 is a converter.

The video signal output from the amplifier circuit 28 and the audio signal obtained from the audio selection circuit 45 are converted into RF signals of the frequency of a predetermined channel (for example, the first channel or the second channel) of the television receiver and output. . 3
4 is a switching means, and a compact disc player 41
Manual operation (including remote control) is performed when reproducing and outputting the video signal supplied from the controller 24, and the operation signal is input to the controller 24.

When the switching means 34 is not operated, the controller 24 controls the amplifier circuit 28 to select the reproduced signal from the pickup 23. Therefore, video disc 21
The reproduced signal from .

Output to the speakers as left and right stereo signals.

On the other hand, the FM video signal is frequency demodulated by a demodulation circuit 29 and then input to a time axis correction circuit 30.

At this time, the synchronization signal generation circuit 31 outputs the reference horizontal synchronization signal and the reference color burst signal to the time axis correction circuit 30.The time axis correction circuit 30 outputs the horizontal synchronization signal and the color burst signal in the reproduction signal as the reference horizontal synchronization signal. The video signal is compared with a reference color burst signal, the time axis error of the video signal is corrected in accordance with the error signal, and the video signal is output to the CRT.

Also with these time axis corrected video signals.

The audio signal selected by the post-demodulation audio selection circuit 45 is also output to the converter 33, where the frequency of m transmission waves is converted into a signal of a predetermined channel and then output.

At this time, the servo circuit 26 is supplied with an error signal between the reproduced horizontal synchronization signal and the reference horizontal synchronization signal from the demodulation circuit 29.
The motor 22 is controlled by a servo circuit 26 in response to this error signal. Also, the pickup 23 is the servo circuit 2
7 controls the focus, tracking, and feeding in the disk radial direction.

Next, when outputting the reproduced RF video signal of the compact disc 1 from the video disc player 42, the switching means 3
4 is operated. Of course, for example, T.

If the controller 4 outputs a signal to the controller 1 to the roller 24 when it is identified from the C information that the disc is a disc on which video information is recorded, the switching means 34
It is also possible to omit manual commands. At this time, the controller 1 to the roller 24 control the servo circuits 26 and 27 via the switching circuit 25 to prohibit the rotation of the motor 22 and the operation of the pickup 23. The amplifier circuit 28 is also switched to select the signal from the input terminal 44.

The detection circuit 5 detects the video area from an address in the reproduced signal or an optical or mechanical switch that detects the position of the carriage that transports the pickup 3 in the radial direction of the disk. When the detection circuit 5 detects a video area, the controller 4 controls the servo circuit 7 via the switching means 6 to make the rotation speed of the motor 2 higher than before the video area is detected.

Further, the equalizers of the servo circuits 7 and 8 are switched in accordance with the rotation speed. However, also in the video area, the servo circuit 7 is supplied with an error signal between the reference clock and the reproduced clock from the demodulation circuit 11, and the disk 1 is rotated with the time axis of the audio signal as a reference. Therefore, regardless of whether the video signal recorded on the compact disc 1 is based on the NTSC system or the PAL system.

The audio signal is reproduced on the correct time axis and there is no need to switch the servo circuit 7 for this purpose.

The PCM audio signal reproduced from the compact disc 1 is sent to the extraction circuit 9 in the same manner as described above. Demodulation circuit 11. After being processed by the D/A conversion circuit 12, it is output to the speaker.

On the other hand, the video signal extracted by the extraction port path 1o in the video area is inputted to the amplifier circuit 28 via the output terminal 43 and the input terminal 44. The video signal amplified by the amplifier circuit 28 (the compact disc 1 is also frequency modulated by the same carrier wave as the video disc 21) is frequency demodulated by the reproduction circuit 29 and input to the 1-time axis correction circuit 30. Output terminal 4 from controller 4
3 and the input terminal 44 to the controller 1 to the roller 24.
A state determination signal is supplied corresponding to the identification signal of the e-information. At this time, the synchronization signal generation circuit 31
4, and generates a y;i quasi-horizontal synchronizing signal and a reference color burst signal in response to the DC component of the time axis error of the reproduced video signal.

That is, as shown in FIG. 2, a reproduced horizontal synchronizing signal or a reproduced color burst toy No. 3 and a reference horizontal synchronizing signal or a reference color burst signal from a voltage controlled crystal oscillator (VCXO) 54 are input to the phase comparator circuit 51. An error signal corresponding to the phase difference is output to the time axis correction circuit 30. A DC component of this error signal is detected by a low-pass filter 52 and inputted as a control voltage to a voltage-controlled crystal oscillator 54 via a switch 53. The switch 53 is switched by the controller 24 to the fixed voltage generating circuit 55 side when reproducing the signal from the pickup 23, and to the low pass filter 52 side when reproducing the signal from the input terminal 44. In this way, the time axis correction circuit 30 aligns the time axis of the video signal with the time axis of the audio signal.

As in the case described above, the video signal is input to the converter 33 and output as an RF video signal of a carrier wave of a predetermined frequency. Also at this time, the D/A conversion circuit 12
The analog audio signal output from the converter 33 is selected by the audio selection circuit 45 controlled by the controller 1-roller 24, frequency-modulated by the modulation circuit built in the converter 33, and output as an RF audio signal with a carrier wave of a predetermined frequency. .

Since no frequency-modulated audio signal is recorded on the compact disc 1, when the switching means 34 is switched, the operation of the demodulation circuit 32 is prohibited.

The present invention is applicable not only to compact disc players and non-optical video disc players.

Application is also possible between a plurality of other playback devices with different standards.

〔effect〕

As described above, the present invention is characterized in that the first information is recorded in the first area and the second area, or the first information is recorded in the first area, and the first information and the information are recorded in the second area. a first reproducing device that reproduces a first recording medium on which information No. 2 is recorded; and a first reproducing device on which information No. 2 is recorded; In the information reproducing apparatus, the first reproducing apparatus detects a second area of the first recording medium. a detection circuit for extracting the second information from the reproduction information of the first recording medium; an output terminal for outputting the second information extracted by the extraction circuit to the second reproduction device; and a switching circuit that switches an equalizer of a servo circuit that moves the first recording medium when the second region is detected, and the second playback device outputs the second information from the output terminal of the first playback device. an input terminal to which is input, a selection means for selecting one of the second information reproduced from the second recording medium and the second information supplied from the input terminal, and the second information supplied from the input terminal. 2 and a demodulation circuit that demodulates the information selected by the selection means from among the second information reproduced from the second recording medium, so some changes are made to the two reproduction devices. This makes it possible to efficiently reproduce three types of recording media.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the information reproducing apparatus of the present invention, FIG. 2 is a block diagram of its synchronizing signal generation circuit, and FIG. 3 is a block diagram of the information reproducing apparatus considered as the background thereof. 1...Compact disk 2...Motor 3...Pickup 4...Controller 5...Detection circuit 6...Switching circuit 7.8...Servo circuit 9.10...Sampling circuit 11 ... Demodulation circuit 12 ... D/A conversion circuit 13 ... Clock generation circuit 14 ... Demodulation circuit 15 ... Time axis correction circuit 16 ... Synchronization signal generation circuit 21 ... Video disc 22 ... Motor 23 ... Pickup 24 ... Controller 25 ... Switching circuit 26.27 ... Servo circuit 28 ... Amplification circuit 29 ... Demodulation circuit 30 ... Time axis correction circuit 31. ... Synchronization signal generation circuit 32 ... Demodulation circuit 33 ... Converter 34 ... Switching means 41 ... Compact disc player 42 ... Video disc player 43 ... Output terminal 44 ... Input terminal 45 ...Audio selection circuit 51...Phase comparison circuit 52...Low pass filter 53...Switch 54...Voltage controlled crystal oscillator 55...Fixed voltage generation circuit or higher

Claims (1)

[Claims] Either the first information is recorded in the first area and the second area, or the first information is recorded in the first area and the first information is recorded in the second area. The first information and the second information are recorded.
a first playback device that plays back a recording medium; and a second playback device that plays back a second recording medium that has a different standard from the first recording medium and has the second information recorded thereon. In the information reproducing device, the first reproducing device includes a detection circuit that detects the second area of the first recording medium, and extracts the second information from the reproduced information of the first recording medium. a sampling circuit; an output terminal for outputting the second information extracted by the sampling circuit to the second reproducing device; and, when the detection circuit detects the second area, the first recording medium. a switching circuit for switching an equalizer of a servo circuit that drives the second reproducing device, the second reproducing device has an input terminal into which the second information is input from the output terminal of the first reproducing device; selecting means for selecting one of the second information reproduced from the recording medium and the second information supplied from the input terminal; An information reproducing apparatus comprising: a demodulation circuit that demodulates information selected by the selection means from among the second information reproduced from a second recording medium.