JPH065578B2 - Information recording disk playback device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an information recording disc reproducing apparatus, and more particularly to an information recording disc (hereinafter, referred to as an information recording disc on which a digital signal is recorded).
A device for reproducing a disc).

BACKGROUND ART As a disc on which digital signals are recorded, a small digital audio disc with a diameter of 12 cm called a compact disc (CD) is known, but recently, it has the same size as the disc. , PCM (Pulse
In addition to the Code Modulation signal, a disc (hereinafter referred to as a CDV disc) in which an FM-modulated video signal and a PCM signal are superimposed and recorded is being developed. In the case of this CDV disc, for example, the first area on the inner circumference side (hereinafter referred to as a CD area) in which audio information is PCM-recorded and the area on the outer circumference side of a radius of 37.5 mm are Modulated video signal and P
Information is recorded by dividing the area into a second area (hereinafter referred to as a video area) in which the CM-converted audio signal is superimposed and recorded.

By the way, the video signal contains a higher frequency component than the PCM signal, and the frequency spectrum of the signal recorded in the video area is as shown in FIG. In the figure, the component indicated by A is a PCM signal, and the component indicated by B is a video FM signal. Therefore, when recording a signal in the video area, it is necessary to increase the rotation speed of the disc as compared with recording in the CD area. As a result, naturally,
Also during reproduction, it is necessary to reproduce in a state where the rotation speed of the disc in the video area is higher than that in the CD area. As shown in FIG. 2, the rotation speed is about 600 rpm at the innermost circumference of the CD area and about 30 rpm at the outermost circumference of the area.
While it is 0 rpm, in the video area, the rotation speed is very high at about 2700 rpm at the innermost circumference and about 1700 rpm at the outermost circumference.

As described above, when reproducing a CDV disc, since the rotational speed of the disc is extremely different between the CD region and the video region, the frequency of the error signal of each servo system becomes high during the reproduction of the video region, and the reproduction of the CD region is performed. The frequency characteristic is different from that of time, and the gain of the entire servo loop is reduced due to the component elements in each actuator and the like, and a countermeasure against it is required.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and provides an information recording disk reproducing apparatus capable of performing stable servo regardless of a reproduction area and reliably reading recorded information when reproducing a CDV disk. The purpose is to provide.

The information recording disk reproducing apparatus according to the present invention increases the gain of at least one servo amplifier of the focus servo unit, the tracking servo unit, the carriage servo unit and the spindle servo unit when reproducing the video area as compared with when reproducing the CD area. It is characterized by that.

Example Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 3 is a block diagram showing the configuration of the information recording disk reproducing apparatus according to the present invention. In the figure, a disk 1 is rotationally driven by a spindle motor 2, and its recorded information is read by an optical pickup 3. The pickup 3 includes a laser diode as a light source, an optical system including an objective lens, a photodetector that receives reflected light from the disc 1, a focus actuator that controls the position of the objective lens with respect to the information recording surface of the disc 1, and a pickup. A tracking actuator and the like for controlling the position of the laser spot light (information reading point) emitted from the disk 3 with respect to the recording track in the disk radial direction are built in. The output of the pickup 3 is supplied to an RF (high frequency) amplifier 4, a focus error signal generation circuit 5 and a tracking error signal generation circuit 6. The pickup output from the RF amplifier 4 is the video information demodulation system 7
And to the digital information demodulation system 8.

In the video information demodulation system 7, the reproduction RF signal from the RF amplifier 4 is demodulated into a video signal by the video demodulation circuit 70 and then supplied to the time axis correction circuit 71. The time axis correction circuit 71 is composed of, for example, a variable delay element such as a CCD (Charge Coupled Device), and performs time axis correction by changing the delay amount of the element according to a control signal from the time axis control circuit 72. It is composed. The time axis control circuit 72 oscillates and divides the oscillation output of a crystal oscillator (VCXO) 73 that oscillates in synchronization with the horizontal synchronizing signal in the video signal output from the video demodulation circuit 70, and the time axis correction circuit 71. The control signal is output in accordance with the phase difference between the horizontal synchronizing signal and the color burst signal in the video signal that has passed through.
No. 102182, etc., and will not be described in detail here. The video signal whose time axis has been corrected by the time axis correction circuit 71 is supplied to the video signal output terminal 9 via the video signal processing circuit 74. In the video signal processing circuit 74,
Processing such as video mute for prohibiting output of a video signal, character insertion based on character information or blue screen information from the character generator 75, or blue screen insertion is performed.

On the other hand, the digital information demodulation system 8 has an area (CD area and video area) to be reproduced when reproducing a CDV disc.
There is provided a selection switch 80 which is switched according to the, and this switch 80 is set to the side a when reproducing the CD area.
When the video area is reproduced, it is on the side b, and its switching is performed in response to a switching command issued from the system controller 27 described later. In the case of a CDV disc, the disc rotation speed is extremely different between the CD region and the video region as described with reference to FIG. 2, and the PCM audio signal is, for example, an EFM (Eight to Fourteen Modulation) signal, and in the video region. When the digital signal is directly superimposed on the FM-modulated video signal at the time of recording, the EFM signal adversely affects the low-frequency component of the FM video signal.
The signal is recorded with the signal level being suppressed by about 27 dB with respect to the video carrier (see FIG. 1). Therefore, even with the same reproduced EFM signal, the frequency characteristic and the amplitude are different between when reproducing the CD area and when reproducing the video area. Therefore, by switching the signal processing system of the reproduced EFM signal between the CD area and the video area, the demodulation system Is being shared.

That is, when reproducing the CD area, the reproduction RF signal is EF.
The EFM signal is an M signal, the frequency characteristic of which is compensated by an equalizer circuit 81 having a predetermined equalizing characteristic, and further amplified by a predetermined gain in an amplifier 82. On the other hand, in the case of reproduction in the video area, only the EFM signal included in the reproduction RF signal together with the FM video signal is
It is extracted by an EFM extraction circuit 83 including an LPF (low-pass filter), the frequency characteristic is compensated by an equalizer circuit 84 having an equalizing characteristic different from that of the equalizer circuit 81, and further amplified by an amplifier 85 having a larger gain than the amplifier 82. As a result, the EFM signal having the same frequency characteristic and amplitude as when reproducing the CD area is output.

During reproduction of the CD disc, the selection switch 80 is always in the state of selecting the a side.

The reproduced EFM signal selected by the selection switch 80 is demodulated.
It is supplied to the correction circuit 86. This demodulation / correction circuit 86
Writes the EFM signal to a memory (not shown) such as a RAM (Random Access Memory) by EFM demodulating, controls the RAM based on the reference clock from the reference clock generator 87, and exchanges data. Error correction is performed using the de-interleave and the parity included in the data. Further, the demodulation / correction circuit 86 detects a frequency error and a phase error between a signal obtained by dividing the reference clock from the reference clock generator 87 and a signal obtained by dividing the frame synchronization signal detected from the EFM signal, A spindle error signal is also generated according to these errors. The digital audio signal demodulated and corrected by the demodulation / correction circuit 86 is D / A (digital /
The signal is processed by the audio signal processing circuit 88 including an analog converter, a deglitcher circuit, etc., and then supplied to the audio signal output terminals 10L and 10R of the left and right channels.

The focus error signal generation circuit 5 is for detecting the amount of deviation of the focal point of the spot light focused on the information recording surface of the disc 1 in the vertical direction with respect to the recording surface.
The focus error signal is generated by a known detection method such as the astigmatism method. On the other hand, the tracking error signal generation circuit 6 is for detecting the deviation amount of the spot light in the disc radial direction with respect to the recording track of the disc 1, and generates the tracking error signal by a well-known detection method such as the 3-beam method. To do. Each output of the focus error signal generation circuit 5 and the tracking error signal generation circuit 6 is output to a driver via equalizer circuits 11 and 12 for compensating the frequency characteristic of each error signal and amplifiers 13 and 14 for controlling the amplitude of each signal. 15, 16
To drive signals for the focus actuator and the tracking actuator (both not shown) incorporated in the pickup 3.

By the way, as described above, in the CDV disc, the rotation speed of the disc during reproduction is extremely different between the CD region and the video region (see FIG. 2). The disk acceleration specifications for tracking will increase.

Therefore, in order to compensate for these, the equalizer circuits 11 and 12 in the servo system for focusing and tracking
The amplifiers 13 and 14 are adapted to change the respective equalizing characteristics and gains in the CD area and the video area by switching the respective circuit components. That is, when the reproducing operation is shifted from the CD area to the video area, the equalizing characteristics of the equalizer circuits 11 and 12 are switched in accordance with the servo switching command issued from the system controller 27 to match the frequency characteristics of the error signals, and further, the amplifier. By increasing the gains of 13 and 14 to match the amplitudes of the error signals, even if the frequency of each error signal increases during the reproduction of the video area, the focus operation and the tracking operation similar to those during the reproduction of the CD area. Can be satisfactorily performed.

As described in the above-mentioned background art section, since the number of rotations of the disk is remarkably high in the reproduction of the video area as compared with the reproduction of the CD area, the frequency of the error signal of each servo system becomes high. Therefore, in order to extend the servo band to a high frequency band for such an error signal and to stabilize the servo loop, the high frequency characteristic of the equalizer characteristic has a higher frequency when reproducing the video area than when reproducing the CD area. Switch to shift to.

In the present embodiment, the equalizer circuits 11 and 12 are
The equalizing characteristics and the gains are variable by switching the circuit components of the amplifiers 13 and 14, but a pair of equalizer circuits and amplifiers having different equalizing characteristics and gains are prepared for each servo system. It goes without saying that the configuration may be selected depending on whether the CD area is reproduced or the video area is reproduced.

The tracking error signal generated by the tracking error signal generation circuit 6 is also supplied to the LPF 17 and its low frequency component is extracted. This low frequency component is equalizer circuit 18
Also, the signal is supplied to the driver 20 via the amplifier 19 and becomes a drive signal of a carriage motor 21 which is a drive source of a carriage (not shown) for moving the pickup 3 in the disk radial direction, thereby forming a carriage servo system. . In addition, the digital information demodulation system 8
The spindle error signal generated by the demodulation / correction circuit 86 is supplied to the driver 24 via the equalizer circuit 22 and the amplifier 23, and becomes a drive signal for the spindle motor 2 that rotationally drives the disk 1, thereby forming a spindle servo system. Has been done.

In both the servo system for the carriage and the spindle, the equalizer circuits 18 and 22 and the amplifiers 19 and 2 are also provided as in the case of the servo systems for the focus and tracking.
By switching each equalizing characteristic and gain of No. 3 between the CD area and the video area, the servo system is stabilized during the reproduction of the video area. Further, the switching of the equalizing characteristic and the gain may be performed by switching each circuit component as in the present embodiment, and a pair of equalizer circuits and amplifiers having different equalizing characteristic and gain are prepared for each servo system. However, it is also possible to adopt a configuration in which these are selected during reproduction of the CD area and during reproduction of the video area.

In this embodiment, the case has been described in which the equalizing characteristics and the gains are switched between the CD area and the video area in all servo systems of focus, tracking, carriage, and spindle, but it is not always necessary to apply to all servo systems. However, even if it is applied only to at least one servo system, for example, a tracking servo system, a practically sufficient effect can be obtained.

By the way, at the time of search, the tracking servo loop is opened, and by applying the kick pulse A and the brake pulse B as shown in FIG. 4 (a) to the tracking actuator, one track jump is performed, and the tracking actuator is moved to the tracking actuator. On the other hand, the kick pulse A and the brake pulse B as shown in FIG.
Is applied to the carriage motor 21 and the fifth
It is well known that, for example, a jump of about 10 to 100 tracks is performed by applying the driving pulse C as shown in FIG. The kick pulse A, the brake pulse B, and the drive pulse C are generated by the system controller 27 and supplied to the drivers 16 and 20. Note that FIG. 4B shows the waveform of the tracking error signal when the spot light of the pickup 3 crosses the track.

Even during this jump operation, the difference in the rotational speed of the disc is dealt with by switching the pulse widths a, b, and c of the respective pulses during reproduction of the CD area and during reproduction of the video area. In other words, when the disc has eccentricity or the like, the effect of disc eccentricity or the like can be minimized by completing the jump operation earlier when the disc rotation speed is high as in the video area. Therefore, in the video area, the operation for increasing the driving force of the tracking actuator and the carriage motor 21 is performed by increasing the pulse widths a, b, c of each pulse as compared with the CD area. The setting and switching of these pulse widths a, b and c can be easily performed by the microcomputer constituting the system controller 27.

Further, instead of switching the pulse widths a, b, c of each pulse, as shown in FIG. 6, the path of each pulse A, B, C applied to the drivers 16, 24 is changed over to the changeover switch 34.
The driving force of the tracking actuator and the carriage motor 21 can be increased by switching between the CD area and the video area by using a and 34b and increasing the crest values d and e of each pulse in the video area. Is obtained.

According to the experimental results by the inventor of the present application, for example, at the time of one-track jump, the peak values d of the kick pulse A and the brake pulse B in the video area are higher than those in the CD area.
By making the pulse width of the brake pulse B large and making the pulse width of the brake pulse B narrow.

In the vicinity of the movement path of the pickup 3 in the disc radial direction, spot light emitted from the pickup 3
A position detector 26 is provided which detects arrival at a position corresponding to the vicinity of the boundary between the CD area and the video area on the V disc and generates a detection signal. The generation of this detection signal makes it possible to detect that the pickup 3 has reached the video area. As the position detector 26,
Since the position of the moving pickup 3 is detected, it is not appropriate to use a structure that applies a load to the pickup 3. For example, a combination of a light emitting element and a light receiving element is used, and the pickup 3 reaches a predetermined position. In this case, a reflection type or transmission type photocoupler arranged so that the light emitted from the light emitting element is reflected, transmitted or blocked, and is incident on the light receiving element, or an output corresponding to the moving position in association with the pickup 3 It is conceivable that a slider pot or the like for generating a volume and a comparator having a reference level corresponding to the predetermined position and having a volume output as a comparison input are used. Also, as the detection position,
The spot light of the pickup 3 is the audio lead-out area in FIG. 2, the boundary line between the lead-out area and the video lead-in area, the middle part of the video lead-in area, and the boundary line between the video lead-in area and the video program area. Alternatively, a position in the video program area may be considered, but in consideration of a mechanical error and disc variation, it is preferable to set it at an intermediate position of the video lead-in area.

The detection signal output from the position detector 26 is supplied to the system controller 27. System controller 27
Is a disc designation information indicating from the operation unit 28 whether the disc to be reproduced is a CD disc or a CDV disc, and a mode indicating whether the reproduction region at the time of reproducing the CDV disc is only the CD region, only the video region, or both regions. Designated information is also supplied. The switching of the mode designation is performed by a toggle operation of the tact switch in the operation unit 28, a switching operation by a slide switch or a push switch, and the operation unit 2.
Not only 8 but also by remote control (wireless, wired) from the outside.

The system controller 27 is composed of a microcomputer, and exchanges data with the video information demodulation system 7, the digital information demodulation system 8 and the like through the bus line 25, and detects signals from the position detector 26. In response to this, switching selection is generated for the selection switch 80 in the digital information demodulation system 8 and each equalizer circuit and amplifier in each servo system, and the disc is automatically conveyed between the disc insertion opening of the device housing and the disc reproduction position. Various commands are supplied to the driver 30 of the motor 29, which is the drive source of the loading mechanism (not shown), or the display unit 31 is controlled. System controller 2
The 7 is also supplied with FG pulses generated by a frequency generator (FG) 32 which is linked to the spindle motor 2.
Then, the system controller 27 counts the number of clocks of a predetermined frequency generated in the generation period of the 1FG pulse, and detects the rotation speed of the spindle motor 2, that is, the rotation speed of the disk 1 based on this count number and the clock frequency. .

In the above embodiment, regardless of the reproduction area of the CDV disc, in the demodulation / correction circuit 86 of the digital information demodulation system 8, the spindle error signal is detected from the frequency and phase error between the frame sync signal and the reference clock in the EFM signal. Is generated and the rotation control of the spindle motor 2 is performed based on this error signal. However, as shown in FIG. 7, it is generated by the demodulation / correction circuit 86 of the digital information demodulation system 8 during reproduction of the CD area. It is also possible to control the rotation of the spindle motor 2 based on the error signal, or based on the error signal due to the phase error between the reproduction horizontal synchronizing signal and the reference horizontal synchronizing signal when reproducing the video area.

That is, in FIG. 7, the time axis control circuit 72 'in the video information demodulation system 7', the phase difference between the reproduction horizontal synchronizing signal extracted from the video signal and the reference horizontal synchronizing signal from the reference horizontal synchronizing signal generator 76. The time axis correction circuit 71 is controlled according to the signal. Further, the phase difference between the horizontal synchronizing signal extracted from the video signal before the time axis correction and the reference horizontal synchronizing signal is compared by the spindle error signal generating circuit 77, and the phase difference signal is used as a spindle error signal as a changeover switch. It becomes one input of 33. On the other hand, the clock generator 87 'in the digital information demodulation system 8'is switched by the switch command from the system controller 27 to the a side at the time of reproducing the CD area, and the b side at the time of reproducing the video area. A reference clock is generated and oscillates in synchronization with the reproduction clock in the EFM signal when reproducing the video area. Then, error correction or the like is performed based on the clock from the clock generator 87 '. When reproducing the CD area, an error signal generated from the frequency and phase error between the reference clock and the frame synchronization signal is used as the spindle error signal. , And the other input of the changeover switch 33. The change-over switch 33 is switched to the side a when reproducing the CD area and to the side b when reproducing the video area in response to a switching command from the system controller 27. As a result, during reproduction of the CD area, based on the spindle error signal generated by the demodulation / correction circuit 86 of the digital information demodulation system 8, and during reproduction of the video area, the spindle caused by the phase error between the reproduction horizontal synchronizing signal and the reference horizontal synchronizing signal. Spindle servo is performed based on the error signal.

Next, in the disc reproducing apparatus according to the present invention, the procedure at the time of reproducing the CDV disc executed by the microcomputer constituting the system controller 27 will be described with reference to the flowcharts of FIGS. 8 to 11.

As shown in FIG. 2, the CDV disc is provided with a lead-in area for each area of the CD area and the video area, and each lead-in area has a TOC (Table of Contents) showing the program content of each area. ) Is recorded, and the TOC in the audio lead-in area also includes data indicating whether or not the disc is a CDV disc. The color television system is mainly used in Japan,
There are the NTSC system adopted in the United States and the PAL system adopted in European countries, and there are also CDV discs based on both types. Therefore, the TOC in the audio lead-in area is based on the NTSC system. Data is also included. Basically, it is an NTSC system CD
It is assumed that the V disc is played back by the NTSC system playback device, and the PAL system CDV disc is played back by the PAL system playback device.

In the following description, a case where a disk is reproduced by an NTSC reproducing apparatus will be described. In FIG. 8, it is assumed that the disc has already been set to the reproducing position, and when a start command is issued from the operating section 28 in this state, first, the carriage motor 21 is driven to move the pickup 3 to the innermost peripheral position of the disc. Move to (step 1). When the detection switch (not shown) detects that the pickup 3 has reached the innermost peripheral position, after focusing the pickup 3,
The TOC information in the lead-in area at the innermost circumference of the disc is read (step 2). After the reproduction of the lead-in area is finished, it is judged whether or not the TOC information is read (step 3). If the TOC information is read, whether or not the disk to be reproduced based on the TOC content is a CDV disk. Whether or not the disc is an NTSC type disc is further determined (step 5).

If it is determined in step 4 that the disc is not a CDV disc, the disc being played back is a CD disc, so the mode is shifted to the CD play mode (step 6). If it is determined in step 5 that it is the NTSC system, the NTSC system is selected.
If it is determined that the system is not the NTSC system, the system shifts to the PAL system CDV disc play mode (step 8). If the TOC information cannot be read due to scratches or stains on the disc in step 3, it is impossible to determine the disc type, so it is temporarily determined that the disc being played is a CDV disc. , CDV determination play mode (step 9). Then, in each of these play modes, a reproducing operation is performed according to a flowchart described later. In addition,
The reproducing operation in the CD play mode (step 6) is well known and will not be described here.

When the operation in each play mode is completed and the process returns to the main flow and it is determined that the reproduction of all program information is completed (step 10), the carriage motor 21 is driven to move the pickup 3 to the home position (step 11). ), The loading motor 29 is further driven, and the disc is ejected by a loading mechanism (not shown) (step 12), and a series of reproducing operations are completed.

Next, the reproducing operation in the NTSC CDV disc play mode (step 7) will be described with reference to the flowchart of FIG.

When a CDV disc is played back, a command for the playback area is given in advance by the operation unit 28. Therefore, based on the mode designation information supplied from the operation unit 28, which indicates whether only the CD area, the video area or both areas are to be reproduced. Then, it is judged whether or not the designation is reproduction of only the video area (step 20), and if it is not the designation of only the video area, the operation shifts to the reproduction operation of the CD area (step 21). Of course, the audio information is reproduced at the time of reproducing the CD area. However, on the television monitor (not shown), the character generator 75 outputs the signal by the signal switching operation of the video signal processing circuit 74 in the video information demodulation system 7. For example, a blue screen is displayed based on the blue screen information. C
When it is detected that the reproduction of the D area is completed (step 2
2) Then, it is judged whether or not only the CD area is designated based on the mode designation information that has been fetched (step 23). Return to the main flow. In the case of designating only the CD area, operations such as search, scan, program play, and repeat can be performed only within the CD area.

If it is determined in step 23 that only the CD area is not specified, both areas are specified for reproduction, so that the spindle motor 2 is rotated at the maximum specified rotation speed (about 270) in the video area.
0 rpm) is accelerated (step 24), and thereafter, when it is detected that the spot light of the pickup 3 has arrived at, for example, the central portion of the video lead-in area based on the detection output of the position detector 26 (step 25), The TOC information in the video lead-in area is read (step 26). At this time, it is determined whether or not the TOC information can be read (step 27). If the TOC information cannot be read, it is determined that the stop position of the spot light of the pickup 3 exceeds the video lead-in area, and the tracking of the pickup 3 is performed. The actuator is driven to cause the spot light to jump back by a predetermined number of tracks (step 28),
In step 26, the TOC information is read again. This operation is repeated until it is determined in step 27 that the TOC information has been read. When the TOC information can be read, the operation moves to the video area reproduction operation (step 2).
9). In this video area, FM-modulated video information and PCM audio information are superimposed and recorded,
Both pieces of information are reproduced.

If it is determined that the stop position of the spot light of the pickup 3 is beyond the video lead-in area and the program information can be read at that position,
Since the position information of the spot light on the disc can be obtained from the read data, it is also possible to calculate the jump amount to the video lead-in area based on the position information and jump back by the jump amount.
The video lead-in area has the same TOC content.
Since the information is recorded repeatedly, it is not always necessary to start reading the information from the head of the area.

When both areas are designated for playback, operations such as search, scan, program play, repeat, etc. can be performed only within the CD area or only within the video area, and also from the CD area to the video area or the video area. An operation such as a search from the area to the CD area and a repeat operation through both areas are also possible.

When it is determined in step 20 that only the video area is designated for reproduction, the spindle motor 2 is accelerated toward the maximum specified rotation speed (about 2700 rpm) in the video area (step 30), and at the same time, the carriage motor 21 is moved.
Is driven to rotate at a high speed to move the pickup 3 toward the video lead-in area at a high speed (step 31), and then the process proceeds to step 25. If you specify only this video area, search, scan,
Operations such as program play and repeat are possible.

In the video area, control (address)
When the data is read by the data of the channel Q of the subcode signal of the CD format, the EFM signal is recorded with the signal level being suppressed by about 27 dB with respect to the video carrier as described above. (See FIG. 1), the error rate of data reading is about three times higher than that of the CD area.

Therefore, read Q data multiple times, for example, up to 3 times,
Keeping the error rate of data reading low by judging the correctness of the data by observing the mutual relationship between these data, adopting the correct data, and repeating the above operation until the correct data can be read if there is no mutual relationship. You can This reading of data and determination of correctness are executed by a microcomputer, and the procedure will be described with reference to the flowchart of FIG.

In FIG. 12, it is assumed that the first read data is A, the second read is B, and the third read is C, and the address is increased by one each time. First, the data A is read (step 70), and then the data B is read (step 7).
1) After that, it is determined whether or not (B = A + 1) ((step 72), and if they match, both data A,
When it is judged that B is correct, the data B read the second time is adopted (step 73). If there is no mutual relationship between the two data A and B, it is determined that one of the data has an error and the third data C is read (step 74). And (C
= A + 2) is determined (step 7)
5) If they match, it is judged that both data A and C are correct, and the data C read the third time is adopted (step 7).
6) If they do not match, it is further determined whether or not (C = B + 1) (step 77). If they match, the process proceeds to step 76 and the data C is adopted. If it is determined in step 77 that they do not match, the process returns to step 70 and the above operation is repeated.

That is, in the above-described operation, first, the data A and B are read twice in succession, and if the two data have a mutual relationship,
The data B read in the second time is adopted without reading the data in the third time.
If the data C for the third time is read and this data C has a mutual relationship with either one of the data A and B, the data C read for the third time is adopted. Although the data is read at most three times, it is not limited to this.

Next, the reproducing operation in the PAL system CDV disc play mode (step 8) in FIG. 8 will be described with reference to the flowchart in FIG.

In this flowchart, step 40 to step 4
5 and steps 50 and 51 are performed in steps 20 to 25 in the flowchart of FIG.
Also, the operations in Steps 30 and 31 are exactly the same. In step 45, when the generation of the detection signal of the position detector 26 is detected and it is determined that the signal is in the video area, the spindle servo causes the demodulation / correction circuit 8 in the digital information demodulation system 8.
6, the servo by the spindle error signal generated based on the frame synchronization signal of the EFM signal (so-called EFM
(Servo) is determined (step 46), EF
If it is not the M servo, it is switched to the EFM servo (step 47). That is, in the reproducing apparatus shown in FIG. 3, the spindle servo by the EFM servo is performed regardless of the reproducing area, but in the reproducing apparatus shown in FIG. 7, the EFM servo is performed only in the CD area. When shifting to the area, the video information demodulation system 7'automatically switches to the servo (so-called video servo) by the spindle error signal generated based on the reproduction horizontal synchronizing signal. Therefore, in the case of the reproducing apparatus, the spindle servo is changed to the EFM servo. The operation to switch to is performed.

When playing a PAL-type CDV disc with an NTSC-type playback device, if video servo is performed in the video area, the color television system is different and synchronization cannot be achieved, so that not only video information but also audio information is played back. It will be impossible. However, since the CD format is common to all discs, by performing EFM servo in the video area, audio information can be normally reproduced although video information cannot be reproduced. The switching to the EFM servo is carried out only in the case of the reproducing apparatus shown in FIG. Since the video information cannot be reproduced, the video signal processing circuit 74
At, the video output is muted and only audio information is output (step 48). At the same time, the PAL system CD for the NTSC system playback device
An indication that the V disk is set is displayed on the display unit 31.
(Step 49), and then returns to the main flow of FIG. As a display method on the display unit 31, a method of blinking a light emitting diode or the like can be considered, but the display method is not limited to this, and instead of displaying on the display unit 31, a television monitor (not shown) is used. ), It is also possible to display by character information.

In this embodiment, the case where the PAL system CDV disc is set in the NTSC system playback device has been described.
The same can be said when a CDV disc of the system is set, and in this case as well, the video information cannot be reproduced in the video area, but the audio information can be reproduced.

Further, in the present embodiment, when the CDV disc of the different system is set to the reproduction device of the predetermined system, only the audio information is reproduced in the video area.
It is also possible not to play the video area at all, or to eject the disc.

Next, the reproducing operation in the play mode (step 9) based on the CDV determination in FIG. 8 will be described with reference to the flowchart in FIG.

First, it is judged whether or not the designation is reproduction of only the video area based on the mode designation information indicating whether the CD area is reproduced, the video area is reproduced, or both areas are reproduced from the operation unit 28 (step 60). If only the video area is not designated, the operation proceeds to the reproduction operation of the CD area (step 6).
1). It is natural that the audio information is reproduced at the time of reproducing the CD area, but a TV monitor (not shown)
Includes a video signal processing circuit 7 in the video information demodulation system 7.
Character generator 7 by the signal switching operation of 4
For example, a blue screen is displayed based on the blue screen information from 5. During the reproduction of the CD area, it is judged whether or not the reproduction of only the video area has been designated from the operation section 28 (step 62). If there is no designation, the processing shifts to step 22 in the flow of FIG.

When the video area is specified during the reproduction of the CD area or when it is determined in step 60 that only the video area is specified, the spindle motor 2 is turned toward the maximum specified rotation speed (about 2700 rpm) in the video area. Acceleration is performed (step 63), and at the same time, the carriage motor 21 is driven to rotate at high speed to move the pickup 3 at high speed in the video lead-in area direction (step 64). After that, when the generation of the detection signal of the position detector 26 is detected and it is determined that it is in the video area (step 65), it is determined whether or not the spindle servo is locked in (step 66). Shifts to step 26 in the flow of FIG. The lock-in of the spindle servo is detected by the spindle servo system (see Japanese Utility Model Laid-Open No. 57-134774, etc.), and a lock-in detection signal is supplied from the servo system to the system controller 27 at the time of detection. To be done.

On the other hand, if the spindle servo cannot be locked in, the disc being played is temporarily determined to be a CDV disc at the time when the TOC contents could not be read (step 3 in the flow of FIG. 5), but the spindle servo locked in. If it is not possible, it means that the reproduction synchronizing signal corresponding to the reference synchronizing signal cannot be obtained. Therefore, it is corrected that the disc being reproduced is not the CDV disc but the CD disc (step 67), and the pickup 3 is set to a predetermined position. It is moved to the position (step 68). As the predetermined position, when the video area is specified during the reproduction of the CD area, the position being reproduced at the specified time, the head position of the music being reproduced at that time, and the reproduction at that time. The head position of the next music after the current music, and the head position of the first music if the music being reproduced at that time is the last music can be considered. It is also possible to put the disc into a stopped state after correcting the disc. When it is corrected as a CD disc, the designation of the video area is not accepted thereafter.

By the way, while playing the video area, access, pause,
When performing an operation such as a stop operation or a search operation in the CD area, the screen of the TV monitor is switched from the reproduced video screen to, for example, a blue screen, and at the time of this switching, the vertical direction of the reproduced video signal is changed. (V) If the sync signal is not synchronized with the vertical sync signal of the blue screen video signal (hereinafter referred to as the blue video signal), the blue screen is disturbed.

Therefore, when switching from the reproduced video screen to the blue screen, the system controller 27 first monitors the arrival of the edge of the vertical synchronization signal in the reproduced video signal as shown in FIG. Character generator 7 that generates a blue video signal when detected
5 (see FIG. 3) is reset (step 81), whereby the vertical sync signal of the blue video signal is matched with the vertical sync signal of the reproduced video signal. Thereafter, the video signal processing circuit 74 (see FIG. 3) switches the reproduced video signal to the blue video signal (step 82).

As described above, the blue screen disturbance can be prevented by switching the signal after the vertical synchronizing signal of the blue video signal is matched with the vertical synchronizing signal of the reproduced video signal.

Conversely, when switching from the blue screen to the playback video screen due to pause release, access termination, or a search operation from the CD area to the video area, the vertical synchronization signal of the blue video signal and the vertical direction of the playback video signal can be changed. If the synchronization signal is not synchronized, the reproduced video screen will be disturbed.

In this case, the vertical sync signal of the blue video signal is gradually reduced or increased with respect to the vertical sync signal of the reproduced video signal within a range where the blue screen is not disturbed, and the vertical sync signal of the blue video signal is gradually reduced or increased. By moving it, it is adjusted to the vertical synchronizing signal of the reproduced video signal, and then the signal is switched to prevent the disorder of the reproduced video screen.
Hereinafter, a specific operation procedure in this case will be described with reference to the flowchart of FIG. Note that FIG. 14 shows the phase relationship between the horizontal synchronizing signal (a), the vertical synchronizing signal (b) of the reproduced video signal, and the vertical synchronizing signal (c) of the blue video signal.

In FIG. 15, I is the number of horizontal synchronizing pulses between the falling edge of the reproduced video vertical synchronizing signal and the falling edge of the blue video vertical synchronizing signal, and I ₀ is between the falling edges of the reproduced video vertical synchronizing signal. The number of horizontal sync pulses. Further, in the present embodiment, a case is shown in which the number of horizontal synchronizing pulses to be reduced or increased is changed in four steps, for example, a, b, c, d are the numbers of horizontal synchronizing pulses to be reduced or increased, A, B, C. , D is the number of times a, b, c, d are reduced or increased. The numbers of a, b, c and d and the numbers of A, B, C and D are arbitrarily assembled in advance and stored in a memory in the microcomputer.

First, the number I of horizontal sync pulses between the falling edge of the reproduced video vertical sync signal and the falling edge of the blue video vertical sync signal is counted (step 83), and then (I <I _0/2 ). Whether or not the interval between the falling edge of the reproduced video vertical sync signal and the falling edge of the blue video vertical sync signal is less than half the interval between the falling edges of the reproduced video vertical sync signal. Is determined (step 84), and if it is 1/2 or less, the horizontal synchronizing pulse is reduced, and A to D are calculated based on I (step 85). Then, after passing through step 86, first, a horizontal sync pulses are reduced by a number (step 8
7) At the same time, the number of sets A is reduced by 1 (step 8
8) Subsequently, the horizontal synchronizing pulse is counted from the falling edge of the reproduced video vertical synchronizing signal, the character generator 75 is reset at the I-th point (step 89), and the above operation is judged as A = 0 in step 86. Repeat until.

When it is determined that A = 0 in step 86, the number of horizontal synchronizing pulses is reduced by b through step 90 (step 91),
At the same time, the number of times of setting B is reduced by 1 (step 92), and then the process proceeds to step 89 and the above operation is performed in step 90.
Repeat until B = 0 is determined. After repeating B times, the number of horizontal synchronizing pulses is reduced by c through step 93 (step 94), and the number of times C of setting is set to 1 at the same time.
The number of times is reduced (step 95), and then the process proceeds to step 89, and the above operation is repeated until it is determined in step 93 that C = 0. Further, the number of horizontal sync pulses is reduced by c through step 96 (step 97), and at the same time, the number of sets D
Is subtracted once (step 98), then the process proceeds to step 89, and the above operation is repeated until D = 0 is determined in step 96. When it is determined in step 96 that D = 0, the alignment of the blue video vertical sync signal with the reproduced video vertical sync signal is completed, and then the signal is switched (step 99).

Note that, in step _{84, (I ≧ I 0/} 2) when it is determined that, although it is performed in an increase operation of the horizontal synchronizing pulse, the operation flow, the step 87 in the flow of reduction, step 91, If steps 94 and 97 are replaced with an operation of increasing a to d, they can be applied as they are. Furthermore, when the horizontal sync pulse is reduced or increased stepwise as described above, it is preferable to gradually increase and decrease the number of reductions or increases, and the maximum reduction or increase of horizontal synchronization pulses. Is a range where the screen is not disturbed, for example, about 10.

Further, when the blue video vertical sync signal is matched with the playback video vertical sync signal, a playback video vertical sync signal, a playback video horizontal sync signal, and a blue video vertical sync signal between the system controller 27 and the video information demodulation system 7. Exchange of a synchronizing signal and a reset signal or the like to the character generator 75 is performed via the bus line 25.

In the above embodiment, the arrival of the spot light of the pickup 3 in the video area is detected based on the detection signal of the position detector 26.
As shown, a BPF 48 bandpass filter) 40
The video area can also be detected by extracting the video carrier from the reproduction RF signal by using, and comparing it with the reference level by the comparator 42 via the peak hold circuit 41. In this case, the pass band of the BPF 40 is
As shown by the alternate long and short dash line in FIG. 17, it is set corresponding to the luminance information signal component C in the video FM signal. In addition,
A is a PCM signal.

As described above, according to the information recording disk reproducing apparatus of the present invention, when reproducing a CDV disk, it is possible to increase the gain of at least one servo amplifier of various servo systems according to the reproducing area. As a result, the frequency characteristics and the amplitude of the error signal can be made the same in both the CD area and the video area, so that stable servo can be performed regardless of the difference in the rotational speed of the disk, and the recorded information can be reliably read.

In the present invention, the spindle servo system for controlling the spindle motor is shown as the servo system for controlling the relative movement speed of the spot light with respect to the disk.
It also includes a tangential servo system that controls a tangential mirror or a tangential actuator.

[Brief description of drawings]

FIG. 1 is a diagram showing a frequency spectrum of a signal recorded in a video area of a CDV disc, FIG. 2 is a diagram showing division of an information recording area in a CDV disc, and FIG. 3 is an information recording disc according to the present invention. 4 and 5 are waveform diagrams of various pulses used during a jump operation, FIG. 6 is a circuit diagram of a circuit for switching the peak value of the various pulses, and FIG. A block diagram showing another configuration of the information recording disk reproducing apparatus according to the invention, FIGS. 8 to 13 are flowcharts showing various operation procedures executed by the microcomputer at the time of reproducing operation, and FIG. 14 is a reproduced video horizontal synchronizing signal. (A), playback video vertical synchronization signal (b) and blue video vertical synchronization signal (c)
15 is a waveform diagram showing the phase relationship of FIG. 15, FIG. 15 is a flowchart showing an operation procedure when the vertical synchronizing signal of the blue video signal is aligned with the vertical synchronizing signal of the reproduced video signal, and FIG.
FIG. 17 is a block diagram showing the construction of an example of means for detecting a video area, and FIG. 17 is a diagram showing the pass band of the BPF in FIG. Description of symbols of main parts 1 ... Information recording disk 2 ... Spindle motor 3 ... Pickup 5 ... Focus error signal generation circuit 6 ... Tracking error signal generation circuit 7 ... Video information demodulation system 8 ... Audio information demodulation System 21 …… Carriage motor 27 …… System controller 29 …… Loading motor 32 …… Frequency generator

Claims (2)

[Claims] 1. A first area on the inner peripheral side where predetermined information is digitally modulated and pulse trained and recorded, and a signal on which frequency information is frequency-modulated video information and a predetermined digital signal are superposed and recorded. A reproducing apparatus capable of reproducing an information recording disc having a second area on the outer peripheral side,
A pickup that irradiates a light beam on the recording surface of the disc and reads recorded information by light passing through the recording surface, and a position of a converging point of the light beam is controlled to read information of the pickup on the recording surface. Focus servo means for forming a point, tracking servo means for controlling the relative position in the disk radial direction between the information reading point and the recording track of the disk, and the disk radial direction of the carriage carrying the pickup with respect to the disk. Carriage servo means for controlling the relative position in the first area and spindle servo means for controlling the relative speed of movement of the information reading point with respect to the disk. The focus servo means, the tracking servo means, and Information recording disc reproducing apparatus characterized by increasing the gain of the at least one servo amplifier of the serial carriage servo means and said spindle servo means. 2. A servo of at least one of the focus servo means, the tracking servo means, the carriage servo means, and the spindle servo means when reproducing the second area, as compared with when reproducing the first area. The invention is characterized by increasing the gain of the amplifier and changing the high frequency characteristic of the equalizer circuit.
An information recording disk reproducing apparatus described in the item.