JPS61120374A - Display device of reproducing device for magnetic disk information - Google Patents

Abstract

PURPOSE:To decide on a disk which is loaded in a device easily and securely by changing the color of the screen of a cathode-ray tube and thus displaying the kind of the disk. CONSTITUTION:A disk deciding circuit 10 decides which of three kinds of disks CD, LDD, and LD is to be reproduced on the basis of detection outputs of detection sensors 6, 7, and 8, and displays the kind of the disk with a color of the screen. For example, when the CD is reproduced, it is decided that the disk size is minimum (12cm) and the output of an AND gate circuit 78 which inputs the detection output of the detection sensor 6 for the innermost periphery and the inversion outputs of the detection sensors 7 and 8 passed through inverters 79 and 80 is CD decision information. Namely, a decision on the CD is made when the detection sensor 6 is on and other detection sensors 7 and 8 are off.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a display device in a recording disk information reproducing device.

11E1 Recording discs include digital audio discs, so-called compact discs (hereinafter referred to as CDs), on which audio signals are subjected to predetermined digital modulation processing and pulse train format, and video and audio signals are frequency-modulated, respectively. Video disks (hereinafter referred to as LDs) are known, and recently, FM-modulated video and audio signals have been digitized using a predetermined digital modulation method to produce pulse train signals. Superimposed recording method (
A video disk (hereinafter abbreviated as LDD) has been developed (see Japanese Patent Application No. 58-45780).

In this recording method, the audio signal is converted into two channels, and the 2.3 MHz and 2.8 MHz audio carriers are each FM modulated by two audio subchannel signals. Further, the video signal is frequency-converted so that the sync tip is 7°6 MH2, the pedestal level is 8.1 M+-12, and the white beak is 9.3 MHz. Then, the audio signal is further converted into PCM (Pulse Code 1ylo
The signal is digitized and converted into a pulse train signal using a modulation method such as (duration).

This pulse train signal is, for example, an EFM (Eight to
l"0LIrtoenMOdlJlatiOn)
Depending on the method, the signal is suitable for recording, and the frequency spectrum is a frequency component of a pulse train having a width of 3T to IIT. Here, T indicates the bit period of the PCM signal, and a 3T pulse is approximately 720 KHz.

The maximum width of 117 pulses is approximately 200Kf-1z. Such a pulse train signal is superimposed on the video main signal at a level of about 1/10 or less, slice amplified near the zero cross point, and becomes a pulse width modulated signal, which is used as a recording signal.

RF (high frequency) obtained from a recording disk on which video signals and audio signals are recorded using the above recording method.
The frequency spectrum of the signal is as shown in FIG. In Fig. 1, the component indicated by A is a digitized audio signal component, the component indicated by B is an audio F'M signal component, the component indicated by C is a color information component in a video FM signal, and the component indicated by D is a video FM signal component. This is the luminance information component in the signal.

Since the dynamic range of the digitized A-dio signal can be approximately 90 or more, the sound quality can be significantly improved compared to recording and reproducing audio signals using the FM modulation method.

By the way, if video discs (LD, LDD) and compact discs (CD) could be played back with a single playback device, it would be extremely advantageous and extremely convenient in terms of economy and usability. When developing such a playback device, it is important to be able to easily and reliably determine whether the disc loaded in the device is a video disc or a compact disc without the user having to remove the disc from the device. It is desirable to be able to distinguish.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned points, and provides a recording disc information playback system that can easily and reliably display the type of disc with a simple circuit configuration and low cost, without the need for a dedicated display unit. The purpose of this invention is to provide a display device for a device.

A display device in a recording disc information reproduction chain according to the present invention includes a disc discriminating means for discriminating the type of disc to be reproduced, a display means for displaying ZeaO information, and a display device for a predetermined period of time based on the discrimination result of the disc discriminating means. a display control means for sharply controlling the screen of the means to one of two different colors; It is said that

Example Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 2 is a block diagram showing an embodiment of a recording disc information reproducing apparatus according to the present invention. Such a playback device is a CD
, LD, and LDD. This player has video discs (L
D, LDD) and digital audio discs (CD>
Since the reproduction rotation speed and the like are different between the two, a spindle motor 1 for driving the LD and LDD rotation and a spindle motor 2 for driving the CD rotation are provided. These spindle motors 1
, 2 are selected depending on the type of disc to be reproduced, and are switched by a switching mechanism 4 using a motor 3 as a driving source, for example.

In order to detect the disc size of the disc 5 to be reproduced, for example, three detection sensors 6, 7 and 8 are provided corresponding to the disc size in the disc radial direction. The disc size is approximately 5 inches (12 cm) in outer diameter for CDs, and for video discs (LD, LDD).
), there are two types of outer diameter: 8 inches and 12 inches. The outputs of the three detection sensors 2, 6, 7, and 8 are waveform-shaped by a waveform shaping circuit, and then sent to the disk discrimination circuit 1.
0. As the detection sensor, for example, an optical sensor is used, but the sensor is not limited to this.

The disc discrimination circuit 10 determines whether the disc to be played is CD5LDD based on the detection outputs of the detection sensors 6.7 and 8.
It is determined which of the three types of disks, LD and LD. A specific circuit configuration of this disk discrimination circuit 10 is shown in FIG. In this diagram, in the case of CD,
The disc size is determined to be the minimum (12 cm), and the detection output of the innermost detection sensor 6 and the inverter 79.8
A where the inverted output of the detection sensor 7.8 that has passed through 0 is made by three people
The output of the ND gate circuit 78 becomes CD discrimination information. That is, when the detection sensor 6 is on and the other detection sensors 7.8 are off, it is determined that it is a CD. In the case of a video disc, since the disc sizes are 8 inches and 12 inches, the detection output of the detection sensor 7 or 8 is passed through the OR gate circuit 69 to the ΔND gate circuit 70. ．． Each of 71 - becomes human power. In addition, the frame synchronization detection circuit 2 to be briefly described
A frame synchronization detection signal generated when a frame synchronization signal is detected from 1 becomes the other input of the AND gate circuit 71, and is also inverted by the inverter 72 and becomes the other input of the AND gate circuit 7o. and detection sensor 7 or 8
When a detection output is generated and a frame synchronization detection signal is input, the AND gate circuit 71 outputs LDD discrimination information, and when the frame synchronization detection signal is not input, the AND gate circuit 70 outputs LD discrimination information. . This discrimination information is used to drive an indicator 11 that displays the type of disc, and is used as a switching signal for various switches.

A pickup 12 for reading recorded information from the disk 5 is carried by a slider base (not shown) provided movably in the radial direction of the disk 5. The read information read from the recording disk 5 by the pickup 12 is supplied to a digital information demodulation system 14, an analog audio demodulation system 15, and a video demodulation system 16 through an RF amplifier 13. The RF amplifier 13 has a wide band of about 5 KH2 to 14 MHz, and a single amplifier can amplify a reproduced PCM audio signal, a reproduced FM audio A signal, and a reproduced video signal.

The digital information demodulation system 14 is provided with a changeover switch 17 that changes depending on the type of disc to be reproduced.
Based on the disc information from , it switches to the A side in the case of an LDD, and to the B side in the case of a CD. That is, L.D.D.
The signal processing system for the reproduced digital signal is switched between reproduction and CD reproduction. When playing a CD, the reproduced RF output is PCM audio information, and this PCM audio information is processed by the equalizer 18 to adjust its frequency characteristics.
M T F (M odulat
ionT ransrcr Function ) compensation is applied.

On the other hand, in the case of LDD, "M audio information and FM
PCM audio information included in the reproduced RF signal together with the video information is extracted by an LPF (low pass filter) 19 and supplied to a de-emphasis circuit 20. PCM
Audio information is, for example, an EFM signal, but if the digital signal is directly superimposed on an FM-modulated video signal during recording, the digital signal component will be interfered with by the low-frequency component of the FM video signal. Low frequency components are boosted and recorded. Therefore, during reproduction, the de-emphasis circuit 20 performs compensation by dropping the low-frequency components boosted during recording. This makes it possible to improve the S/N ratio of the digital signal with respect to low frequency noise during recording and reproduction.

Note that instead of switching the signal processing system using the changeover switch 17, the power supply to each signal processing system circuit is set to 0N.
A similar effect can be obtained by using 10FF.

The reproduced EFM signal that has passed through the changeover switch 17 is supplied to the FFM demodulation circuit 22 via the frame matching detection circuit 21 and is also supplied to the reproduced clock extraction circuit 23, where the reproduced clock extracted by the reproduced clock output circuit 23 is The signal is demodulated into a PCM digital signal by the EFM demodulation circuit 22.

This demodulated signal is written into a memory 24 such as a RAM (random access memory) under the control of a memory controller 25, but at this time, the memory controller 25 is synchronized with the write clock which is the frequency-divided output from the frequency divider 26 of the reproduced clock. Write.

Reading of stored information from the memory 24 is performed in synchronization with a read clock obtained by dividing the oscillation output of a VCO (voltage controlled oscillator) 27 in a PLL (phase locked loop) circuit by a frequency divider 28. It has become. The PLL circuit is the VCO27 mentioned above.
, the frequency-divided output of the reproduced clock by the frequency divider 29 and VC'0
A phase comparator (P/C) 31 that uses the divided output of the frequency divider 27 of the oscillation output of 27, an LPF (low pass filter) 32 that receives this comparison output as input, and this LP
The output voltage of F32 and the reference voltage Vrer are selectively set to V.
It is constituted by a changeover switch 33 that supplies CO27.

In the PLL circuit, the changeover switch 33 is on the a side to set the output voltage of the LPF 32 during LDD playback, and is switched to the b side to set the reference voltage Vrel'+ during CD playback, based on the discrimination result of the disc discrimination circuit 10 described above. VC
Supplied to O27. As a result, during LDD playback, the readout clock for reading stored information from the memory 24 is phase-synchronized with the playback clock by the PLL circuit, and during CD playback, the loop switch 59, which will be described later, is turned on (closed) to perform phase comparison. The output of the device 31 is L
By driving the spindle motor 2 for driving the CD rotation through the PF 77, the reproduced clock is phase-synchronized with the fixed clock obtained by the VGO 27 whose bias is in a fixed state.

The digital signal thus read out is converted into an analog audio signal by a D/A (digital/analog) converter 34, and then sent to an LPF 35L.

35R to become left and right playback audio outputs.

The usage status in the memory 2/I is constantly monitored by the memory controller 25, and when the memory 24 becomes A-bar 70- or becomes blank (no data), information indicating these conditions is sent from the controller 25. Supplied to voltage generator 36. During LDD playback, this voltage generation ``1
36 generates a positive control voltage when the memory 24 overflows, and generates a negative control voltage when the memory 24 becomes blank, according to information indicating the usage status of the memory 24 from the memory controller 25. It is superimposed on the output voltage of the LPF 32 and sent to the VCO 27 via the changeover switch 33.
The frequency of the read clock is controlled by supplying the read clock.

In this way, m of the data stored in the memory 24 is constantly monitored, and when there is an excess or deficiency in the capacity and processing capacity of the memory 24, a positive or negative control voltage is generated to supply the P L 1 circuit. By requesting that action be taken, the memory 24 can always be maintained in a normal state.

In the analog audio demodulation system 15, the outputs of 8PF (band pass filters) 37L and 37R that pass only audio carrier components of 2.3 MHz and 2.8 MHz from the reproduced RF signal are sent to an FM demodulator 381.38R.
7127 circuit 39
Left and right playback audio outputs are provided via L and 39R.

In the video demodulation system 16, only video information is extracted from the reproduced RF signal by a BPF & notch circuit 40. This BP
In the F&notch circuit 40, the EFM components included in the reproduced RF signal during LDD reproduction, 2.3M1-1z, 2.8
MHz audio carrier components are actively removed. This extracted information is supplied to the FM demodulator 42 via the limiter circuit 41 and is FM demodulated. This demodulated output is passed through a dropout compensator (D
QC) 44, and dropout compensation is performed in the compensator 44. This dropout compensator 4
4 is, for example, a dropout sensor (DO8) that detects a dropout based on the rei+<F iB signal supplied via an HPF (bypass filter) 45.
46, and a hold capacitor provided between the switch output terminal and a reference potential point. Therefore, when a dropout occurs, the dropout sensor 4
The level of the output of the LPF 43 immediately before the output of No. 6 is generated is held and sent to the next stage circuit, and dropout compensation is performed. The output of this dropout compensator 44 becomes a video output.

The output of the dropout compensator 44 is sent to the horizontal sync separation circuit 4.
7, and the horizontal synchronizing signal is separated and output. This horizontal synchronizing signal is supplied to phase comparators 48 and 49, and the phase difference with the reference signal output from the reference signal generator 50 is detected. The output of the phase comparator 48 serves as an input to the adder 51, and the output of the phase comparator 49 supplies the equalizer amplifier 5.
2, the adder 51 is operated by another person. The output of the adder 51 is the equalizer amplifier 53 and the driver 5.
4, the spindle motor 1 for driving the LDD and LD rotation is driven. This is the spindle servo system. Further, the output of the equalizer amplifier 52 drives an actuator (not shown) built into the pickup 12 via a loop switch 55, a changeover switch 56, and a driver 57.

By driving this actuator, a light spot for reading information is biased in the tangential direction of the recording track of the disk. This is the tandiencialmibo group. Note that the actuator may be a tangential mirror that rotates to shift the optical spot for reading information in the tangential direction of the recording track of the disk, or a tangential mirror that displaces the lens in a direction perpendicular to the optical axis. The optical spot for information reading may be biased in the tangential direction of the recording track of the disk.

The loop switch 55 is turned on (opened) in response to a spindle lock signal output from the spindle lock detection circuit 58 when locking of the spindle servo system is substantially completed. In other words, at the beginning of the regeneration amount, the spindle motor 1 is driven by the output of the C1 forward f phase comparator 48, and coarse adjustment of the time axis (spindle servo) is performed.
When the locking of the spindle servo is substantially completed, the loop switch 55 is turned on, and the actuator is driven by the output of the phase comparator 49 to perform fine adjustment of the time axis (tangential mebo).

According to this, residual jitter components that cannot be removed by the spindle servo system can be removed by the tangential-shalmibo group.

However, even in the tangential mirror system, jitter cannot be completely removed because mechanical systems such as actuator drive grooves cannot sufficiently follow high-frequency components of residual jitter. Therefore, in the digital information demodulation system 14 mentioned above, P
The residual jitter component can be removed by setting the cutoff frequency of the LPF 32 of the L1 circuit to be lower than the maximum frequency of the band of the tangential vol loop to cut the high frequency component of the residual jitter. More preferably, by setting the cutoff frequency of the LPF 32 lower than the disk eccentricity frequency (30 to 8H2 in the case of LDD), it is possible to completely eliminate jitter caused by disk eccentricity.

Although the spindle servo and tangential servo are performed based on the horizontal synchronization signal, the same effect can be obtained by performing the spindle servo and tangential servo based on the 3, 58 MHz color subcarrier included in the reproduced FM video signal.

The above is a servo system when playing a video disc (LDD, LD>), but when playing a CD, spindle servo is performed based on the output of the phase comparator 31 in the digital information demodulation system 14 mentioned above. That is,
The output of the phase comparator 31 drives the spindle motor 2 for driving the CD rotation via a loop switch 59 that is turned on (closed) during CD reproduction and a driver 60. Conventionally, the above-mentioned tangential servo was not performed during CD playback, but since the spindle motor 2 cannot sufficiently follow the high-frequency component of the output signal of the phase comparator 31, which is a time axis error signal, this implementation was In the example, )-IP
A servo, ie, a tangential servo, is also employed in which the high frequency component of the time axis error signal extracted by F61 drives the actuator in the pickup 12 via the changeover switch 56 and driver 57. The changeover switch 56 is switched to the a side when playing back OO or Lo, and to the b side when playing a CD, based on the discrimination result of the disc discrimination circuit 10.

Although the tangential servo during CD playback is performed based on the divided output of the reproduced clock extracted by the reproduced clock extraction circuit 23, Even if it is performed based on the frequency output, the same effect can be obtained since the frame synchronization signal and the reproduced clock are in a synchronous relationship.

The output of the spindle lock detection circuit 58 is connected to the inverter 62.
This signal is inverted and becomes the sole power of the OR gate circuit 63 as a spindle unlock signal indicating that the spindle servo system is not in the locked state.

As the output of the OR gate circuit 63, a random access information signal generated at the time of a random access command such as scan, search, jump, etc. is supplied. Furthermore, the LDD information output from the disk discrimination circuit 10 is also input to the OR gate circuit 63.

The output of the OR gate circuit 63 is supplied to the recovered clock extraction circuit 23 via the control command circuit 64.

A specific circuit configuration of the recovered clock extraction circuit 23 is shown in FIG. In this figure, the reproduced EFM signal is transmitted to the phase comparator 6.
5, a phase difference with the oscillation output of a VCO (voltage controlled oscillator) 66 is detected, and the phase difference signal is supplied to the VCO 66 via an LPF 67 and a changeover switch 68. As described above, a PLL circuit that generates a reproduced clock is configured.

The changeover switch 68 is normally located on the a side and supplies the output of the LPF 67 to the VCO 66, but the control command circuit 6 described above
When a command signal is output from 4, it switches to the b side in response to this command signal and supplies a predetermined reference voltage Vrerz to the VCO 66.

In other words, when the spindle servo is not in the locked state or when scanning, searching, or When the information reading optical spot jumps tracks due to a random access command such as a random access command, the spindle servo can be activated by applying the reference voltage yrer2 to the VCO 66 and fixing its oscillation frequency to a value close to the reproduced clock frequency. This makes it possible to hasten the lock-in of the recovered clock after the clock is zeroed or after the random access command is released.

Referring again to FIG. 2, the audio output section includes a pair of left and right output terminals 73L, 73 of the analog audio output system.
A pair of left and right output terminals 741.74R of a digital audio output system are provided. Output terminal 73L
, 73R are supplied with audio output from the analog audio demodulation system 14. This audio output is output via the selector switch 75 to the output terminals 74L and 7 during LD playback.
It is also supplied to 4R. The changeover switch 75 is, for example, an LD
It is on the a side assuming the normal state during playback, and is LDD.

When playing a CD, the switch is switched to the b side based on the disc discrimination information from the disc discrimination circuit 10. The audio output from the digital information demodulation system 14 is supplied to the output terminals 74L, 74R via the left and right mode changeover switches 76L, 76R and the changeover switch 75.

As a result, during LD playback, the output terminal 73L.

Normal audio signals are output from 73R and output terminals 74L and 74R, and when playing an LDD or CD, high-quality audio signals are output from the output terminals 74L and 74R, and when playing an LDD, normal audio signals are also output from the output terminals 73L and 73R. An audio signal will be output.

The mode changeover switches 76L and 76R are provided to change over the output mode of digital audio audio signals in an analog stage. That is, if the audio output from the digital audio demodulation system 14 is stereophonic, the above-mentioned output mode is sufficient, but in the case of audio multiplexing, for example, the L (left) channel is Japanese and the R (right) channel 11 is used. The channel is in a foreign language, and the mode selector switch 76m operates independently of each other.
, 76R, the audio output from the output terminals 741.74R can be switched to three output modes: Japanese and foreign languages, Japanese only, and foreign languages only. The mode changeover switches 76L and 76R are driven separately according to control information from an operation section (not shown).

Relays that operate independently are used as the mode changeover switches 76L and 76R. Normally, a relay with one movable contact and two fixed contacts is sufficient for signal switching, but in this embodiment, a relay with one movable contact and two extra fixed contacts is used. is used. That is, if we take the relay 761 on the L channel side as an example, there are two sets of movable contacts S that interlock with each other.
1°521 and these two sets of movable contacts SI1. two sets of fixed contacts S12.13, one pair provided for each S21;
Of the two sets of fixed contacts, the two fixed contacts SI2.823 that are closest to each other serve as input ends for the two signals (left and right audio signals), and one movable contact S
I+ is the output terminal. According to this, since two gaps exist between the left and right signal lines, crosstalk between the left and right signals can be reliably prevented. Of course, crosstalk can be more reliably prevented by increasing the number of contacts and providing more gaps.

The demodulated digital signal demodulated by the EFM demodulation circuit 22 includes data such as the total time, remaining m time, and number of tracks, and is inserted into the Q channel of the user's bit, for example. On the other hand, various data are also inserted into the demodulated video signal demodulated by the FM demodulation circuit 42, for example, within the vertical blanking period.

In FIG. 5, the data included in the demodulated digital signal is extracted by a data extraction circuit 81, which is a first extraction means, in synchronization with the detection output from the data interval detection circuit 82, and is extracted by the single power of the selection switch 83. Become. On the other hand, the data (Q information) included in the demodulated digital signal is separated by a Q information separation circuit 90, which is a second extraction means, and the selection switch 8
3. It becomes the power of others. The data selected by the selection switch 83 is supplied to a character generator 84.

The sync separation circuit 85 separates horizontal and vertical signals included in the demodulated video signal.
The vertical synchronization signal is separated and made available to the changeover switch 86 alone. The reference synchronization signal generation circuit 87 generates a synchronization signal corresponding to the above horizontal and vertical synchronization signals, and supplies it to the changeover switch 86 and the adder 91 as well as to the timing signal generation circuit 92 . The output of the adder 91 becomes the output of the changeover switch 88. A demodulated video signal is supplied as an input to the 1,7JS switch 88. Both the selection switch 83 and the changeover switch 86 are
During LD playback, the switch is switched to the a side, and during CD playback, the switch is switched to the b side in response to a CD discrimination signal from the disc discrimination circuit 10.

The selector switch 88 is normally located on the a side (including during LD playback), and the above-mentioned CD supplied via the OR gate circuit 93
It switches to the b side in response to a discrimination signal or a squelch signal.

During LD playback, the character taxi generator 84 synchronizes with the horizontal and vertical synchronization signals from the synchronization separation circuit 85, and also outputs the C
During D reproduction, data output from the selection switch 83 is converted into character (including symbols) information in synchronization with the synchronization signal from the reference synchronization signal generation circuit 87. That is, the character generator 84 is used for both LD playback and CD playback. The output of character generator 84 is supplied to eight adders. The adder 8 adds horizontal and vertical synchronizing signals to the character information from the character generator 84 and outputs the video.

According to this configuration, when a CD is played back, the Q information can be displayed on a cathode ray tube (not shown) for displaying video information, and the cathode ray tube can be used effectively. Also,
Since the character generator 84 is commonly used for CD playback and LD playback, the circuit configuration can be simplified and realized at low cost.

The reference synchronization signal generation circuit 87 further generates a 3.58 MHz signal corresponding to a color burst signal, and inputs the signal to the phase shift circuit 94 and gate circuit 95.
The selection switch 96 is operated by one person. Phase shift circuit 94
shifts the phase of the input signal by 180 degrees and uses the output as the input of the selection switch 96. The output of the selection switch 96 becomes the input of the gate circuit 97. A timing signal generated by the timing signal generation circuit 92 is applied to the gate circuits 95 and 97 as a gate pulse. The timing signal generation circuit 92 determines the front porch period (a) and the horizontal period of the composite color video signal (A) as shown in FIG. 6 based on the horizontal and vertical synchronization signals supplied from the reference synchronization signal generation circuit 87. Gate pulses (B) and (C) corresponding to the scanning period (b) are generated, respectively. The respective outputs of the gate circuits 95 and 97 are multiplied by a sigma adder 98 and become individual inputs of the adder 91 mentioned above. The selection switch 96 is the LD
A side during playback, disk discrimination circuit 10 during CD playback
It switches to side b in response to a CD discrimination signal from.

Here, at the start of disc playback, a squelch signal is generated and a certain muting period is provided, but this squelch signal is also supplied to the changeover switch 88 via the OR gate circuit 93, and during the muting period the switch 88 switch to side b. On the other hand, the type of disc to be played is determined by the disc discrimination circuit 10, and if the disc to be reproduced is a CD, a CD discrimination signal is generated and supplied to the selection switch 96, so that the selection switch 96 is switched to the b side. . As a result, the 3,58 MHz signal outputted from the reference synchronization signal generation circuit 87 is shifted by 180° in phase by the phase shift circuit 94.
The signal passes through the gate pulse (C) generation WJIi' gate circuit 97, and the signals 3, 58M1-12 output from the reference synchronization signal generation circuit 87 are directly passed through the gate pulse (B) generation phase layer gate circuit. 95, an adder 98, and an adder 91 where the horizontal and vertical synchronizing signals outputted from the reference synchronizing signal generation circuit 87 are added, thereby producing a video output. As a result, the 3.58 MHz signals superimposed on the front porch period (a) and the horizontal scanning period (b) of the composite color video signal (A>) have opposite phases, so the color of the CRT screen changes only during the muting period. becomes blue.

On the other hand, when the disc to be played is an LD, the selection switch 96 is on the a side, and the 3.58 MHz signal output from the reference synchronization fi signal generation circuit 87 is directly used to generate gate pulses (B) and (C). Period gate circuits 95 and 97
The water turbine/vertical synchronizing signal is added by an adder 91 to produce a video output. As a result, the front porch period (a>) and the horizontal scanning period (
Since the 3.58M and 1z signals superimposed on the signal (b) are in phase with each other, the color of the cathode ray tube screen becomes green only during the muting period. In other words, the type of disc loaded in the player can be displayed by changing the color of the CRT screen, and in the case of a so-called slot incubator like the compatible play AI according to the present invention, the type of disc loaded in the player can be displayed by changing the color of the CRT screen. This is particularly useful since the type cannot be identified externally.

Although not shown in the figure, a focus servo system that controls the position of the pickup 12 relative to the disk 5 in a direction perpendicular to the disk surface, and a tracking servo system that controls the position of the pickup 12 in the disk radial direction are also included. In these servo systems as well, it is preferable to switch the error signal processing system between when playing a video disc (LDD, LD) and when playing a digital audio disc (CD). Good servo can be performed regardless of the type.

In addition, the digital signal recorded on CD or LDD is
In addition to audio information, it also includes digitized image information and control information for computer control.

To LL11 As explained above, according to the display device in the recording disc information reproducing device according to the present invention, the type of disc loaded in the device is displayed by changing the color of the screen of the cathode ray tube. , the type of disk can be easily and reliably displayed with a simple circuit configuration and low cost without providing a dedicated display section.

[Brief explanation of drawings]

Figure 1 shows the frequency spectrum of an RF multiplied signal obtained from a recording disk recorded by superimposing a signal obtained by frequency modulation processing of a video signal and an audio signal, and a signal obtained by PCM modulating an analog signal and making it into a pulse. 2 is a block diagram showing an embodiment of the recording disc information reproducing apparatus according to the present invention, and FIG. 3 is a block diagram showing a specific circuit configuration of the disc discrimination circuit in FIG. 2.
FIG. 4 is a waveform diagram showing the timing of generation of gate pulses (B) and (C) with respect to the combined color video signal (A) of the reproduced 0x extraction circuit in FIG. Explanation of symbols of main parts 1...Swiss spindle motor 2 for LD and LDD
...CD spindle motor 5...Recording disc 10...Disc discrimination circuit 12...Pickup 14...Digital information demodulation system 15...・・・
・Analog audio demodulation system 16...Video demodulation system

Claims (1)

[Claims] Recording disk information capable of reproducing a first recording disk on which a video signal and an audio signal are respectively recorded after being modulated in a predetermined manner, and a second recording disk on which predetermined information is subjected to a predetermined digital modulation process and recorded in the form of a pulse train. A display device in a playback device, the display device comprising a disc discrimination means for discriminating the type of disc to be played, a display means for displaying video information, and a screen of the display means different for a predetermined period based on a discrimination result of the disc discrimination means. 1. A display device for a recording disc information reproducing apparatus, comprising display control means for controlling the screen to display one of two colors, and displaying the type of disc by the color of the screen of said display means.