JPS62243175A - Information recording disk reproducing device - Google Patents

Abstract

PURPOSE:To attain the optimum jump regardless of the reproducing region at the reproduction of a CDV disk by adopting the constitution that at least one of the pulse width and the peak value of a drive pulse is switched in response to the reproducing region. CONSTITUTION:In the jumping in the CVD disk, each peak value (d) of a kick pulse A dna a brake pulse B is increased and the torque of a tracking actuator and a carriage motor is increased by narrowering the pulse width of the brake pulse B in the video region in comparison with the CD region. Thus, even when the rotating speed of the disk at both the regions diffrs from each other extremely, since the device copes, with the past, the optimum jumping is applied always regardless of the reproducing region.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an information recording disc reproducing device, and particularly to an information recording disc (hereinafter referred to as
The present invention relates to a device for playing a disc (simply referred to as a disc).

Discs on which digital signals are recorded are called compact discs (CDs) and are approximately 12 cm in diameter.
A small-sized digital audio disc is known, but recently, PCM with the same size as the disc
In addition to pulse code modulation signals, discs (hereinafter referred to as CD discs) on which FM-modulated video signals and PCM signals are recorded in a superimposed manner are being developed.

In the case of this CDV disc, for example, the audio information
The first area on the inner circumference side recorded as a commercial (hereinafter referred to as C
(referred to as area D) and, for example, an area on the outer circumferential side from a radius of 37.5 mm, where FM-modulated video signals and PCM
The second recorded audio signal is superimposed with the converted audio signal.
(hereinafter referred to as video area) and information is recorded in the area.

Incidentally, the video signal contains higher frequency components 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.

For this reason, when recording signals in the video area, it is necessary to increase the rotational speed of the disc compared to when recording in the CD area, and as a result, it is natural that during playback, the speed in the video area is higher than that in the CD area. The disc must be played at a high rotational speed. Its rotation speed is the second
As shown in the figure, in the CD region, the innermost circumference of the region is about 600 rpa+.

While it is about 300 rpm at the outermost circumference of the area, it is about 2700 rpm+ at the innermost circumference of the area in the video area! It has a very high rotational speed of about 170 Orpm at the outer periphery.

In this way, when playing a CDV disc, the rotational speed of the disc is extremely different between the CD area and the video area. If the disk has eccentricity, it will be easily affected by the eccentricity on the high-speed rotation side.
There may be cases where the desired jumping motion cannot be obtained.

1.511 The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide an information recording disc reproducing device that can perform an optimal jump operation regardless of the reproduction area when reproducing a CD disc. .

The information recording disc reproducing apparatus according to the present invention is a reproducing apparatus capable of reproducing CDV discs, and includes a first means for shifting the information reading point of the pickup in the radial direction of the disc, and a second means for moving the pickup in the radial direction of the disc. means, and is configured to switch at least one of the pulse width and peak value of the drive pulse applied to the first means or the first and second means in response to a jump command according to the reproduction region. ing.

1-Yutaka-3 Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 3 is a block diagram showing the configuration of an information recording disc reproducing apparatus according to the present invention. In the figure, a disk 1 is rotationally driven by a spindle motor 2, and 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 disk 1, a focus actuator that controls the position of the objective lens with respect to the information recording surface of the disk 1, and a pickup. A tracking actuator and the like that control the position of the laser spot light (information reading point) emitted from 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 that has passed through the RF amplifier 4 is sent to the video information demodulation system 7.
and is supplied to the digital information demodulation system 8.

In the video information demodulation system 7 , the reproduced RF signal from the RF amplifier 4 is demodulated into a video signal by a video demodulation circuit 70 and then supplied to a time axis correction circuit 71 . The time axis correction circuit 71 includes, for example, a CCD (Charge Couple).
ed Device), etc., and is configured to perform time axis correction by changing the amount of delay of the element in accordance with a control signal from the time axis control circuit 72. The time axis control circuit 72 includes the video demodulation circuit 70
For example, the oscillation output of a crystal oscillator (VCXO) 73 that oscillates in synchronization with the horizontal synchronization signal and its frequency-divided output in the video signal output from the video signal, and the horizontal synchronization signal and color in the video signal that has passed through the time axis correction circuit 71. It is configured to output a control signal according to the phase difference with the burst signal, and its specific configuration is shown in Japanese Patent Laid-Open No. 56-102182 and other publications, and will not be described in detail here. This time axis correction circuit 71
The video signal without time axis correction is supplied to the video signal output terminal 9 via the video signal processing circuit 74. The video signal processing circuit 74 performs processing such as video muting, which prohibits the output of video signals, and character insertion or blue screen insertion based on character information or blue screen information from the character generator 75.

On the other hand, the digital information demodulation system 8 has areas (CD area and video area) to be played back when playing back a CDV disc.
A selection switch 80 is provided, which is switched according to a switching command issued from a system controller 27, which will be described later. It will be done accordingly. In the case of a CDV disc, as explained in FIG. 2, the rotational speed of the disc is extremely different between the CD area and the video area, and the PCM audio signal is
In the video domain, if the digital signal is directly superimposed on the FM modulated video signal during recording, the EFM signal will have a negative effect on the low frequency components of the FM video signal. Although the degree of modulation is the same, the EFM signal is recorded in a state where the signal level is suppressed by about 27 cf3 with respect to the video carrier (see FIG. 1). Therefore, even if the same reproduced EFM signal has different frequency characteristics and amplitude when reproducing the CD area and when reproducing the video area, the demodulation system can be changed by switching the signal processing system of the reproduced EFM signal between the CD area and the video area. The aim is to share the same information.

That is, when reproducing the CD area, the reproduced RF signal is EF
This EFM signal has its frequency characteristics compensated by an equalizer circuit 81 having predetermined equalizing characteristics, and is further amplified by an amplifier 82 with a predetermined gain. On the other hand, in the case of video area playback, only the EFM signal included in the playback RF signal together with the FM video signal is
EFM extraction circuit 8 consisting of PF (low pass filter) etc.
3, the frequency characteristics are compensated by an equalizer circuit 84 which has equalizing characteristics different from those of the equalizer circuit 81, and further layer width is adjusted by an amplifier 85 having a larger gain than the amplifier 82. It is output as an EFM signal with the same frequency characteristics and amplitude.

Incidentally, when playing back a CD disc, the selection switch 80 is always in a state where the a side is selected.

The reproduced EFM signal selected by the selection switch 80 is demodulated and
The signal is supplied to a correction circuit 86. This demodulation/correction circuit 86 demodulates the EFM signal and writes it into a memory (not shown) such as a RAM (random access memory), and also writes it into a memory (not shown) such as a RAM (random access memory). control, exchange data, de-interleave, and perform error correction using the parity contained in the data. In addition, 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 converted into a D/A (digital/
After the signal is processed by an audio signal processing circuit 88 consisting of an analog converter, a deglitcher circuit, etc., it is supplied to left and right channel audio signal output terminals 10L and 10R.

The focus error signal generation circuit 5 is for detecting the deviation of the convergence point of the light converged on the information recording surface of the disc 1 in the vertical direction with respect to the recording surface, and uses the astigmatism method. A focus error signal is generated by a well-known detection method such as . On the other hand, the tracking error signal generation circuit 6 is for detecting the amount of deviation of the spot light in the disk radial direction with respect to the recording track of the disk 1, and generates a tracking error signal using a well-known detection method such as the three-beam method. Let's do it.

The respective outputs of the focus error signal generation circuit 5 and the tracking error signal generation circuit 6 are connected to drivers via equalizer circuits 11 and 12 that compensate for the frequency characteristics of each error signal, and amplifiers 13 and 14 that control the amplitude of each signal. 15 and 16, and serve as drive signals for a focus actuator and a tracking actuator (both not shown) built into the pickup 3.

By the way, as mentioned earlier, in a CDV disc, the rotational speed of the disc during playback is extremely different between the CD area and the video area (see Figure 2), so when playing the video area, the focus is lower than when playing the CD area. , the tracking disk acceleration spec will increase.

Therefore, in order to compensate for these, equalizer circuits 11 and 12 in the focus and tracking servo systems
The amplifiers 13 and 14 are configured to change each equalizing characteristic and gain between the CD area and the video area by switching each circuit component. That is, when the playback operation shifts from the CD area to the video area, the equalizing characteristics of the equalizer circuits 11 and 12 are switched in response to the servo switching command issued from the system controller 0-527 to match the frequency characteristics of each error (Ei). By further increasing the gains of the amplifiers 13 and 14 to match the amplitudes of the error signals,
Even if the frequency of each error signal becomes high during playback of the video area, focus and tracking operations can be performed satisfactorily as in the case of playback of the CD area.

Note that in this embodiment, the equalizer circuits 11 and 12
The equalizing characteristics and gains were configured to be variable by switching the circuit components of the amplifiers 13 and 14, but a pair of equalizer circuits and amplifiers with different equalizing characteristics and gains were prepared for each servo system, and these were Of course, a configuration may be adopted in which selection is made when reproducing the CD area and when reproducing the video area.

The tracking error signal generated by the tracking error signal generation circuit 6 is also supplied to the LPF1 7, and its low frequency components are extracted. This low frequency component is equalizer circuit 1
8 and an amplifier 19 to the driver 20,
This signal serves as a drive signal for a carriage motor 21, which is a drive source for a carriage (not shown) that moves the pickup 3 in the disk radial direction, and constitutes a carriage servo system. Also, t! in the digital information demodulation system 8! ! The spindle error signal generated by the correction/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. ing.

In both the carriage and spindle servo systems, as in the case of both the focus and tracking servo systems, the equalizer circuit 18.22 and the amplifier 19.23
By switching the equalizing characteristics and gains between the CD area and the video area, the servo system is stabilized when playing back the video area. Furthermore, the equalizing characteristics and gain may be changed by 17J by switching each circuit component as in this embodiment, or by preparing a pair of equalizer circuits and amplifiers with different equalizing characteristics and gains for each servo system. , these on CD
The configuration may be such that selection is made at the time of region reproduction and at the time of video region reproduction.

In addition, in this embodiment, the case where each equalizing characteristic and gain are switched between the CD1i region and the video region in all the servo systems of focus, tracking, carriage, and spindle has been explained, but it is not necessarily necessary to apply them to all the servo systems. Even if the present invention is applied only to at least one servo system, for example, a tracking servo system, sufficient practical effects can be obtained.

By the way, during a search, one track jump is performed by putting the tracking servo loop in an oven state and applying a kick pulse A and a brake pulse B as shown in FIG. 4(a) to the tracking actuator. On the other hand, kick pulse A and brake pulse B as shown in FIG. 5(a)
is applied to the carriage motor 21, and the fifth
It is well known that a jump of, for example, about 10 to 100 tracks can be performed by applying a driving pulse C as shown in FIG. 3(b). The kick pulse A1, the brake pulse B, and the drive pulse C are generated by the system controller 27 and supplied to the drivers 16 and 20. Incidentally, FIG. 4(b) shows the waveform of the tracking error signal when the light crosses the track of the pickup 3.

Even during this jump operation, the pulse width a of each pulse is the same when reproducing the CD area and when reproducing the video area.

By switching between b and c, differences in the rotational speed of the disk can be accommodated. In other words, if there is an eccentricity on the disk, the effect of the eccentricity on the disk can be minimized if the jump operation is completed quickly when the rotational speed of the disk is high, such as in the case of video areas. Therefore, in the video area, the driving force of the tracking actuator and carriage motor 21 is increased by making the pulse widths a, b, and c of each pulse wider than in the CD area. These pulse widths a, b, and c can be easily set and adjusted by a microcomputer that constitutes the system controller 27.

In addition, instead of switching the pulse widths a, b, and c of each pulse, as shown in FIG.
The same effect can be obtained because the driving force of the tracking actuator and carriage motor 21 can be increased by switching between the CD area and the video area using the signals a and 34b and increasing the peak values d and e of each pulse in the video area. is obtained.

According to the experimental results by the inventor of the present invention, for example, when jumping one track, the peak values d of kick pulse A and brake pulse B are lower in the video area than in the CD area.
An optimal jump operation is obtained by increasing the pulse width of the brake pulse B and narrowing the pulse width of the brake pulse B.

Near the movement path of the pickup 3 in the disk radial direction, the spot light emitted from the pickup 3 is placed on the CD.
A position detector 26 is provided that detects that the V disc has arrived at a position corresponding to the vicinity of the boundary between the CD1m and the video area and generates a detection signal. By generating this detection signal, it is possible to detect that the pickup 3 has reached the video area. As the position detector 26,
Since the purpose is to detect the position of the moving pickup 3, a structure that places a load on the pickup 3 is inappropriate.For example, a structure consisting of a combination of a light emitting and a light receiving element is used to detect the position of the pickup 3 when the pickup 3 reaches a predetermined position. A reflective or transmissive photocoupler arranged so that the light emitted from the light emitting element is reflected, transmitted, or blocked and enters the light receiving element when A conceivable configuration is a comparator having a volume such as a slider pot that generates , and a reference level corresponding to the above-mentioned predetermined position, and which uses the volume output as a comparison input. The detection positions include the audio lead-out area in FIG. 2, the boundary line between this lead-out area and the video lead-in area, the middle part of the video lead-in area, and the video lead-in area. Possible locations include the boundary line with the video program area, or a location that enters the video program area, but considering mechanical errors and disc variations, it is preferable to set the location at the middle of the video lead-in area. .

A detection signal output from the position detector 26 is supplied to a system controller 27. System controller 27
From the operation unit 28, disc specification information indicating whether the disc to be played is a CD disc or a CDV disc, and a mode indicating whether the playback area when playing a CDV disc is only the CD area, only the video area, or a double-headed area. Specification information etc. are also supplied.

This mode designation can be changed by toggling a tact switch on the operation unit 28, switching operation using a slide switch or a button switch, or by operating not only the operation unit 28 but also an external remote control (wireless or wired). is also carried out.

The system controller 27 is composed of a microcomputer, and exchanges data with the video information demodulation system 7, digital information demodulation system 8, etc. via the path line 25, and receives detection signals from the position detector 26. In response, a switching command is generated for the selection switch 80 in the digital information demodulation system 8 and each equalizer circuit and amplifier in various servo systems, and the disc is automatically transported between the disc insertion slot of the device housing and the disc playback position. Various commands are supplied to the driver 30 of the motor 29, which is the driving source of the loading mechanism (not shown), or the display unit 31 is controlled.

The system controller 27 further includes an F generated by a frequency generator (FG) 32 interlocked with the spindle motor 2.
A G pulse is also provided. Then, the system controller 27 counts the number of clocks of a predetermined frequency that occur during the generation period of one FG pulse, and detects the rotational speed of the spindle motor 2, that is, the rotational speed of the disk 1, based on this counted number and the clock frequency. .

In the above embodiment, regardless of the playback area of the CDV disc, the demodulation/correction circuit 86 of the digital information demodulation system 8 generates a spindle error signal from the frequency and phase error between the frame synchronization signal in the EFM signal and the reference clock. is generated and the rotation of the spindle motor 2 is controlled based on this error signal.As shown in FIG. It is also possible to adopt a configuration in which the rotation of the spindle motor 2 is controlled based on the error signal caused by the phase error between the reproduced 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- detects the phase difference between the reproduced 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 synchronization signal extracted from the video signal before time axis correction and the reference horizontal synchronization signal is compared in the spindle error signal generation circuit 77, and the phase difference signal is switched as the spindle error signal. Switch 33 is the one-man power. On the other hand, the clock generator 87- in the digital information demodulation system 8- is operated by a switch 88 which is switched to the a side when reproducing the CD area and to the b side when reproducing the video area in response to a switching command from the system controller 27.
When reproducing a region, a reference clock of a predetermined frequency is generated, and when reproducing a video region, it oscillates in synchronization with the reproduction clock in the EFM signal. Error correction and the like are performed based on the clock from this clock generator 87', and when reproducing the CD area, the 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. Assume that the changeover switch 33 is operated by someone else. The changeover switch 33 is the system controller 2
According to the switching command from 7, when playing the CD area, the
When reproducing the video area, each switch is switched to the b side. As a result, the phase error between the playback horizontal synchronization signal and the reference horizontal synchronization signal is determined based on the spindle error signal generated by the demodulation/correction circuit 86 of the digital information demodulation system 8 during re-main playback of the CDR region, and the phase error between the playback horizontal synchronization signal and the reference horizontal synchronization signal during video region playback. Spindle servo is performed based on the spindle error signal.

Next, in the disc reproducing apparatus according to the present invention, the procedure for reproducing a CD/2 disc executed by the microcomputer constituting the system controller 27 will be described with reference to the flowcharts shown in FIGS. 8 to 11.

As shown in Figure 2, a CDV disc has a lead-in area for each of the CD area and video area.
) is recorded and also the TOC in the audio lead-in area.
also includes data indicating whether or not the disc is a CDV disc.

In addition, the main color television systems are the NTSC system, which is used in Japan, the United States, etc., and the PAL system, which is used in European countries, and some CDV discs are also based on both systems, so the audio The TOC in the lead-in area also includes data indicating whether the disc is based on the NTSC system or the PAL system. Basically, an NTSC system CDV disc is played by an NTSC system playback device, and a PAL system CDV disc is played by an NTSC system playback device.
It is assumed that each disc is played back by a PAL playback device.

In the following description, a case will be described in which a disc is played back by an NTSC system playback device. In FIG. 8, it is assumed that the disc has already been set at the playback position, and when a start command is issued from the operation unit 28 in this state, the pickup 3 is first moved to the innermost position of the disc by driving the carriage motor 21. (Step 1). When a detection switch (not shown) detects that the pickup 3 has reached the innermost position, the pickup 3 is focused, and then
The TOC information in the lead-in area on the innermost circumference of the disc is read (step 2).

After the playback of this lead-in area is finished, it is determined whether or not the TOC information has been read (step 3). If the TOC information has been read, it is determined whether the disc to be played is a CDV disc or not based on the TOC content. (Step 4), and further, it is determined whether or not the disc is an NTSC disc (Step 5).

If it is determined in step 4 that it is not a CDV disc, the disc being played is a CD disc, so the mode shifts to CD play mode (step 6), and if it is determined in step 5 that it is in the NTSC format, the The system shifts to the CDV disc play mode (step 7), and 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).

In addition, in step 3, if the TOC information cannot be read due to scratches or dirt on the disc, it is impossible to determine the type of disc, so the disc being played is
It is temporarily determined that the disc is a DV disc, and a shift is made to a play mode (step 9) based on CDV determination. In each of these play modes, playback operations are performed according to the flowchart described later. Note that the playback operation in the CD play mode (step 6) is well known, so a description thereof will be omitted here.

After completing the operation in each play mode, the process returns to the main 70-, and when it is determined that all program information has been reproduced (step 10), the carriage motor 21 is driven to move the pickup 3 to the home position (step 10). 11), further drive the loading motor 29 to
The disc is ejected by a loading mechanism (not shown) (step 12), and the series of playback operations is completed.

Next, the reproduction operation in the NTSC CDV disc play mode (step 7) will be explained according to the flowchart of FIG.

When playing a CDV disc, the playback area is specified in advance on the operation unit 28, so it is possible to play only the CD area, play only the video area, or play only the video area supplied from the operation unit 28.
Or, based on the mode designation information indicating whether to play both areas, it is determined whether the specification is to play only the video area (step 20), and if only the video area is not specified, the C
Shifts to playback operation of area D (step 21).
Naturally, audio information is played back when the D area is played back, but the TV monitor (not shown) also receives signals from the character generator 75 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. When it is detected that the playback of the CD area has ended (step 22), it is then determined whether only the CD area has been specified based on the imported mode specification information (step 23), and only the CD area is specified. If it is specified, the process returns to the main flow shown in FIG. Note that when only the CD area is specified, operations such as search, scan, program play, and repeat are possible only within the CD area.

If it is determined in step 23 that only the CD area is not specified, open area playback is specified, and the spindle motor 2 is rotated at the maximum specified rotational speed (approximately 27
In step 24), the pickup 3
When it is detected that the spot light has arrived at, for example, the center of the video lead-in area (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 has been read (step 27). If it has not been read, it is determined that the stop position of the spot light of the pickup 3 is beyond the video lead-in area, and the pickup 3
The tracking actuator is driven to make the spotlight jump back by a predetermined number of tracks (step 2).
8) Go to step 26 and read the TOC information again. This operation is repeated until it is determined in step 27 that the TOC information has been read. If the TOC information can be read, the process moves to the video area playback operation (step 29). In this video area, FM modulated video information and PCM audio information are recorded in a superimposed manner, and image information is reproduced.

In addition, if it is determined that the stop position of the spotlight 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.

Also, in the video lead-in area, there is a TOC with the same content.
Since the information is repeatedly recorded, it is not necessarily necessary to start reading the information from the head of the area.

In the case of this open area playback specification, operations such as search, scan, program play, repeat, etc. can be performed only within the CD area or only the video area, and operations such as search, scan, program play, repeat, etc. can be performed only within the CD area or only the video area.
Operations such as searching from the n-area to the video area or from the video area to the CD area, and repeat operations through the double-head area are also possible.

If it is determined in step 20 that only the video area is to be played back, the spindle motor 2 is accelerated toward the maximum specified rotational speed (approximately 2700 rpm+) in the video area (step 30), and at the same time, the carriage motor 21 is rotated at high speed. drive to move pickup 3 toward the video lead-in area at high speed (step 31)
, after which the process moves to step 25. When only the video area is specified, operations such as quick check, scan, program play, repeat, etc. can be performed only in the video area.

In addition, in the video area, the control (address)
When reading data using channel Q data of the CD format subcode signal, as described above,
Since the EFM signal is recorded with the signal level suppressed by about 27cE relative to the video carrier (first
(see figure), the data reading error rate is 3 times higher than that in the CD area.
It will be about twice as expensive.

Therefore, read the Q data multiple times, for example, up to 3 times,
By looking at the correlation between these pieces of data, it is possible to judge whether the data is correct or incorrect and select the correct data, and if there is no correlation, the above operation is repeated until the correct data can be read, thereby keeping the error rate of data reading low. I can do it. Reading of this data and determining whether it is correct or incorrect is executed by a microcomputer, and the procedure will be explained according to the diagram 70 in FIG.

In FIG. 12, it is assumed that the first read data is A, the 2nd read is 8, and the third read is C, and the address increases by one each time. First, data A is read (step 70), then data B is read (step 71).
), then it is determined whether or not (B=A+1) (step 72), and if they match, it is determined that both data A and B are correct, and data B read the second time is adopted ( Step 73). If there is no correlation between the two data A and B, it is assumed that one of the data has an error, and the third data C is read (step 74).

Then, it is determined whether (C=A+2) or not (step 75), and if they match, it is determined that both data A and C are correct, and the third read data C is adopted (step 76). , if they do not match, further (C=8+1
) is determined (step 77), and if they match, the process moves to step 76 and 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-described operation is repeated.

In other words, in the above operation, data A and B are read twice in succession, and if there is a mutual relationship between the two data, data B read the second time is used without reading the third data. If there is no mutual relationship between the two data, read data C for the third time, and this data C becomes data A.
If there is a mutual relationship with either of the data C and B, the third read data C is used. Note that although data is read a maximum of three times, the present invention is not limited to this.

Next, the playback operation in the PAL/DV disc play mode (step 8) in FIG. 8 will be explained according to the flowchart in FIG. 10.

In this flowchart 1., steps 40 to 45 and step 50. Each operation in step 51 is the ninth
Step 20 to Step 2 in the flowchart in the figure
5 and step 30. The operations are exactly the same as those in step 31. In step 45, when the generation of the detection signal of the position detector 26 is detected and it is determined that it is a video area, the spindle servo is activated by the demodulation/correction circuit 86 in the digital information demodulation system 8. Libo due to error signal (so-called EF
Step 46), E
If it is not FM servo, it is switched to EFM servo (step 47). That is, in the playback device shown in FIG. 3, spindle servo is performed by EFM servo regardless of the playback area, but in the playback device shown in FIG. 7, EFM servo is performed only in the CD area, and When moving to the region, the video information system 7- automatically switches to the servo (so-called video servo) based on the spindle error signal generated based on the reproduction horizontal synchronization signal. It performs the action of switching to .

When playing a PAL CD disc on an NTSC playback device, if video servo is performed in the video area, synchronization cannot be achieved because the color television system is different, and it is necessary to play back not only video information but also audio information. becomes impossible.

However, since the CD format is common to all discs, by performing EFM servo in the video area, video information cannot be reproduced, but audio information can be reproduced normally. In addition, EF
Switching to M servo is performed only in the case of the reproducing apparatus shown in FIG.

Since it is impossible to reproduce the video information, the video output is muted in the video signal processing circuit 74.
Only audio information is output (Stella 748). At the same time, P
A message indicating that an AL type cDV disc is set is displayed on the display section 31 (step 49), and then the process returns to the main screen O- in FIG. The display method on the display section 31 may include a method of blinking a light emitting diode, etc., but is not limited to this. Also, instead of displaying on the display section 31, a television monitor (not shown) )
It is also possible to display text information or the like.

In addition, in this embodiment, the case where a PAL format CDV disc is set in an NTSC format playback device has been explained.
The same thing can be said when a CDV disc of the same format is set; in this case as well, video information cannot be played back in the video area, but audio information can be played back.

Furthermore, in this embodiment, when a CDV disc of a different format is set in a playback device of a predetermined format, only audio information is played back in the video area.
It is also possible to not play the video area at all or to eject the disc.

Next, the playback operation in the play mode (step 9) based on CDV determination in FIG. 8 will be explained according to the flowchart in FIG. 11.

First, based on the mode designation information from the operation unit 28 indicating whether only the CD area, only the video area, or both areas are to be played, it is determined whether or not only the video area is specified (step 60). , if only the video area is not specified, the process shifts to the CD area playback operation (step 61).
). Naturally, audio information is played back when this CD area is played back, but a video signal processing circuit 74 in the video information demodulation system 7 is also displayed on the television monitor (not shown).
The character generator 75
A blue screen is projected based on, for example, blue screen information from. During playback of this CD area, the operation section 2
8, it is determined whether or not there is a designation to reproduce only the video area (step 62), and if there is no designation, the process moves to step 22 in the flowchart of FIG.

If the video area is specified during playback of the CD area, or if it is determined in step 60 that only the video area is specified, the spindle motor 2 is rotated at the maximum prescribed rotational speed (approximately 2700 rl) m) for the video area. At the same time, the carriage motor 21 is driven to rotate at high speed to move the pickup 3 toward the video lead-in area at high speed (step 64). After that, the generation of the detection signal from the position detector 26 is detected and it is determined that the area is in the video area (step 65), and it is determined whether the spindle servo is locked in (step 6).
6) If the lock-in is achieved, the process moves to step 26 in the flow of FIG.

The lock-in of the spindle servo is detected by the spindle servo system (Utility Model Application No. 57-13477).
(Refer to Publication No. 4, etc.), a lock-in detection signal is supplied from the servo system to the system controller 27 at the time of detection.

On the other hand, if the spindle servo cannot lock-in, the disc being played is temporarily set to
It was determined that it was a DV disc, but if the spindle servo cannot lock in, it means that a playback synchronization signal corresponding to the reference synchronization signal cannot be obtained, so the disc being played is a CD disc, not a CDv disc. Correctly, in step 67), the pickup 3 is moved to a predetermined position (step 68). If the video area is specified during playback of the CD area, the predetermined positions include the position that was being played at the specified time, the beginning position of the song that was being played at that time, and the position that was being played at that time. Possible examples include the beginning position of the next song after the song being played, or the beginning position of the first song if the song being played at that time is the last song. It is also possible to enter a stop state after correcting the disc to a CD disc.

If the disc is corrected to be a CD disc, no further video area specifications will be accepted.

By the way, while playing the video area, you can access, pause,
When an operation such as a stop operation performs a search operation to the CD area, the screen of the TV monitor is switched from the playback video screen to, for example, a blue screen, but at the time of this switching, the playback video signal is If the vertical (V) synchronization signal and the vertical synchronization signal of the blue screen video signal (hereinafter referred to as blue video signal) are not synchronized, the blue screen will be distorted.

Therefore, when switching from the playback video screen to the blue screen, the system controller 27 first monitors the arrival of the edge of the vertical synchronization signal in the playback video signal (step 80) and detects the edge, as shown in FIG. A character generator 75 generates a blue video signal when
(see FIG. 3) (step 81), thereby matching the vertical synchronization signal of the blue video signal with the vertical synchronization signal of the reproduced video signal. Thereafter, the signal is switched from the reproduced video signal to the blue video signal in the video signal processing circuit 74 (see FIG. 3) (step 82).

In this way, by matching the vertical synchronizing signal of the blue video signal with the vertical synchronizing signal of the reproduced video signal and then switching the signals, it is possible to prevent disturbances in the blue screen.

Conversely, when switching from the blue screen to the playback video screen due to release of pause, end of access, etc., or search operation from the CD area to the video area, etc., the vertical synchronization signal of the blue video signal and the vertical synchronization signal of the playback video signal are If the synchronization signal is not synchronized, disturbances will occur on the reproduced video screen.

At this time, the vertical synchronization signal of the blue video signal is gradually reduced or increased with respect to the vertical synchronization signal of the reproduced video signal, and the horizontal (H) synchronization signal is gradually reduced or increased within a range that does not disturb the blue screen while giving a good appearance. By moving it little by little, it matches the vertical synchronization signal of the reproduced video signal, and then by switching the signal, it is possible to prevent disturbances on the reproduced video screen.

Hereinafter, the specific operating procedure in this case will be explained according to the flowchart of FIG. 15. Note that FIG. 14 shows the phase relationship of the horizontal synchronization signal (a) of the reproduced video signal, the vertical synchronization signal (b), and the vertical synchronization signal (C) of the blue video signal.

In FIG. 15, I is the number of horizontal synchronization pulses between the rising edge of the reproduced video vertical synchronization signal and the falling edge of the blue video vertical synchronization signal, and io is the horizontal synchronization between the falling edges of the reproduced video vertical synchronization signal. This is the number of pulses. Further, in this embodiment, a case is shown in which the number of horizontal synchronizing pulses to be reduced or increased is changed in, for example, four stages, where a, b, c, and d are the numbers of horizontal synchronizing pulses to be reduced or increased, A, B, and C. , D is the number of times a, b, c, d (7) is reduced or increased. In addition, a, b.

It is assumed that the numbers c and d and the number of times A, B, C, and D are arbitrarily assembled in advance and stored in the memory within the microcomputer.

First, count the number of horizontal synchronization pulses I between the falling edge of the reproduced video vertical synchronization signal and the falling edge of the blue video vertical synchronization signal (step 83), and then check whether (1<I o / 2). In other words, it is determined whether the moving interval between the falling edge of the reproduced video vertical synchronizing signal and the rising edge of the blue video vertical synchronizing signal is 172 or less than the interval between the falling edges of the reproduced video vertical synchronizing signal. Step 84), if the horizontal synchronization pulse is less than 1/2, the horizontal synchronization pulse is reduced based on A.
-D calculations are performed (step 85). Then, through step 86, the horizontal synchronizing pulse is first reduced by a number (step 87), and at the same time, the set number A is decreased by one (step 88), and then the horizontal synchronizing pulse is reduced from the falling edge of the reproduced video vertical synchronizing signal. Reset the character generator 75 at the first count (step 89),
The above operation is repeated until it is determined as A-0 in step 86.

If it is determined that A=O in step 86, the horizontal synchronizing pulse is reduced by b through step 90 (step 91),
At the same time, the number of sets B is decreased by 1 (step 92), and after L, the process moves to step 89, and the above operation is repeated in step 90.
Repeat until it is determined that B=O. When the process is repeated 8 times, the horizontal synchronizing pulse is reduced by 0 through step 93 (step 94), and at the same time, the number of sets C is reduced by 1 (step 95), after which the process moves to step 89, and the above operations are repeated. is repeated until it is determined in step 93 that C=0. Further, through step 96, the horizontal synchronizing pulse is reduced by 0 (step 97), and at the same time, the number of sets is decreased by 1 (step 98), after which the process moves to step 89, and the above operation is performed in step 96 to D-0. Repeat until determined. When it is determined that D=O in step 96, the matching of the blue video vertical synchronization signal to the reproduced video vertical synchronization signal is completed, and the signal is then switched (
Step 99).

Note that in step 84, (I≧I o /2
), the horizontal synchronizing pulse is increased, and the operation 70- is performed in step 87. in the reduction flow. Step 91, Step 94
．． If step 97 can be replaced with the operation of increasing a-d, it can be applied as is.

Furthermore, when reducing or increasing the number of horizontal synchronizing pulses in stages as described above, it is preferable to gradually increase the number of horizontal synchronizing pulses to be reduced or increased, and also to gradually reduce the number of horizontal synchronizing pulses to be reduced or increased. is set within a range that does not disrupt the screen, for example, about 10.

In addition, when adjusting the blue video vertical synchronization signal to the playback video vertical synchronization signal, the playback video vertical synchronization signal, the playback video horizontal synchronization signal, the blue video vertical synchronization signal, and the blue video vertical synchronization signal are transmitted between the system controller 27 and the video information demodulation system 7. Synchronization signals and reset signals to the character generator 75 are exchanged via the pass line 25.

In the above embodiment, the arrival of the spotlight of the pickup 3 to the video area is detected based on the detection signal of the position detector 26.
As shown in the figure, the video area can also be detected by extracting the video carrier from the reproduced RF signal using a BPF (48 bandpass filter) 40 and comparing it with a reference level by a comparator 42 via a peak hold circuit 41. I can do it. In this case, the passband of the BPF 40 is set corresponding to the luminance information signal component C in the video FM signal, as shown by the dashed line in FIG. In addition, A
is a PCM signal.

As explained above, according to the information recording disc reproducing apparatus according to the present invention, at least one of the pulse width and the peak value of the drive pulse applied to the tracking actuator and the carriage motor is controlled during the jump operation of the CDV disc. By switching between the CD area and the video area, even if the rotational speed of the disc is extremely different between the two head areas, this can be accommodated, so that an optimal jump operation can always be performed regardless of the playback area.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the frequency spectrum of a signal recorded in the video area of a CDV disc, Fig. 2 is a diagram showing the division of information recording areas on a CD disc, and Fig. 3 is a diagram showing information recording according to the present invention. 4 and 5 are waveform diagrams of various pulses used during jump operation, FIG. 6 is a circuit diagram of a circuit for switching the peak values of the various pulses, and FIG. 7 is a block diagram showing the configuration of the disc playback device. A block diagram showing another configuration of the information recording disc playback device according to the present invention,
8 to 13 are flowcharts showing various operation procedures executed by the microcomputer during playback operation, and FIG. 14 shows the playback video horizontal synchronization signal (a), the playback video vertical synchronization signal (b), and the blue video vertical synchronization signal. belief vi<c
15 is a waveform diagram showing the phase relationship of
FIG. 6 is a block diagram showing the configuration of an example of means for detecting a video area, and FIG. 17 is a diagram showing the passband of the BPF in FIG. 16. Explanation 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 (1)

[Claims] A first area on the inner circumferential side where predetermined information is digitally modulated and recorded as a pulse train, and a second area on the outer circumferential side where a signal obtained by frequency modulating video information and a predetermined digital signal are superimposed and recorded. A reproducing apparatus capable of reproducing an information recording disc having an area of 1, a first means for biasing an information reading point of the pickup in the radial direction of the disc, and a second means for moving the pickup in the radial direction of the disc. means for applying a drive pulse to the first means or the first and second means in response to a jump command; and an information reading point of the pickup located in the first and second areas. means for detecting that the vicinity of the boundary has been reached and generating a detection signal, and determining at least the pulse width and peak value of the drive pulse in the first region and the second region based on the detection signal. An information recording disk reproducing device characterized in that one side is switched over.