JPH087460A - Video disk reproducing device - Google Patents

Abstract

PURPOSE:To reduce the time to initiate a reproducing by greatly reducing the time to discriminate a disk. CONSTITUTION:A reproducing mode right after a disk loading is initially set to the reproducing mode of a standard video disk, an optical pickup 4 is moved to the position where the lead in information of the subject standard video disk is read, under a control and a video disk 1 is controlled and rotated at the rotational speed of the standard video disk. A MUSE/LD discriminating circuit 10 and a system controller 11 automatically discriminate the kind of the installed video disk based on the presence or the absence of reproduced signals which are reproduced under the set initial condition and the reproduced signals. By this arrangement, standard video disks which are popular and are easily discriminated at a slower rotational speed, are mainly discriminated and all others are discriminated as high quality video disks.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a so-called MUSE (Multiple Sub-Nyquist S) which is a high-definition television signal.
Ampling Encoding) signal recorded at a constant angular velocity or a constant linear velocity, and a high-definition video disc, for example, N
Standard television signals such as TSC and PAL
The present invention relates to a video disc reproducing apparatus for reproducing a standard video disc recorded at a constant angular velocity or a constant linear velocity, and in particular, shortens the discrimination time when automatically discriminating and reproducing each of the above-mentioned video discs, and starts the reproduction. The present invention relates to a video disc reproducing apparatus that shortens the time required for playing.

[0002]

2. Description of the Related Art Conventionally, a video disc in which image information is recorded on an optical disc and a video disc reproducing apparatus for reproducing image information from the video disc are known.

As the above-mentioned video disc, image information has a constant angular velocity (CAV) or a constant linear velocity (CL) according to the NTSC system which is a standard television system of Japan.
V) recorded NTSC video disc and high definition television system, so-called MUSE (Multiple S
MUS in which image information is recorded at a constant angular velocity or a constant linear velocity according to the ub-Nyquist Sampling Encoding method.
There are a total of four types of video discs, the E-video disc.

The CAV MUSE video disc is
The lead-in track is recorded at a position 73 mm or more and 74.5 mm or less from the center of the disc.
LV MUSE video discs, CAV NTSC video discs and CLV NTSC video discs each have a lead-in track from the center of the disc.
It is recorded at a position of 3.5 mm or less.

A conventional video disc reproducing apparatus automatically discriminates and reproduces the above four types of video discs on the basis of the information recorded in the lead-in track. When the disc is mounted on the turntable, the playback mode is automatically changed to C above.
Initialize the MUSE playback mode for playing an AV MUSE video disc. Also, set the servo system gain to MU.
While setting to high gain for SE video disc,
The optical pickup is controlled to move to the position where the lead-in track of the CAV MUSE video disc is recorded. Then, the video disc is rotationally controlled up to 2600 rpm which is the specified rotation speed of the MUSE video disc, and the reproduction signal reproduced by the optical pickup is detected.

The fact that the reproduction signal is detected by the optical pickup means that the lead-in information is recorded at a position 73 mm or more and 74.5 mm or less from the center of the disc. Therefore, at this point, the video disc reproducing device determines that the video disc mounted on the turntable is a CAV MUSE video disc, and performs reproduction for the CAV MUSE video disc.

Next, when the reproduction signal is not detected from the optical pickup, the video disc reproducing apparatus temporarily stops the rotation of the video disc and moves the optical pickup to a position 53.5 mm or less from the center of the disc. Control movement. And this time the servo gain is set to NT
While setting to low gain for SC video disc,
The rotation of the video disc is controlled so that the rotation speed is 1800 rpm, which is the specified rotation speed of the NTSC video disc.

When the video disc mounted on the turntable is an NTSC video disc, for example, the carrier of the RF signal of the reproduction signal reproduced by the optical pickup is detected, or the image information after demodulation is displayed. By detecting, it can be discriminated whether it is a CAV NTSC video disc or a CLV video disc. The above-mentioned video disk reproducing device is the above-mentioned RF
Based on the carrier of the signal or the image information after demodulation,
When it is determined that it is the CAV NTSC video disc, reproduction is performed for the CAV NTSC video disc, and when it is determined that it is the CLV video disc, reproduction is performed for the CLV NTSC video disc.

Further, as a result of the above-mentioned video disc reproducing apparatus performing the discrimination for the NTSC video disc based on the carrier wave of the RF signal or the image information after demodulation, the video disc mounted on the turntable is CLV.
If it is determined that the video disc mounted on the turntable is a CAV MUSE video disc, it is determined that the gain of the servo system is MUSE again.
While setting the high gain for the video disc, increase the disc rotation speed to the above 2600 rpm to increase the CAV M
Playback for USE video discs.

Since the conventional video disc reproducing apparatus can automatically discriminate the type of the video disc mounted on the turntable in this way, and reproduce according to the discriminated type of the video disc. The user does not need to manually set the type of the video disc mounted on the turntable, and the troublesome time required for reproduction can be omitted.

[0011]

Here, since the penetration rate of MUSE television receivers to general households is low at present, even in video discs,
The NTSC video disc is more prevalent than the MUSE video disc. Therefore, the NTSC video disc is more likely to be loaded than the MUSE video disc as the video disc loaded in the video disc playback device.

However, in the conventional video disc reproducing apparatus, when the video disc is mounted on the turntable,
As described above, the playback mode was automatically set to the MUSE playback mode even though it is unlikely to be loaded.
There is a problem that it takes a long time to discriminate between the SE video disc and the NTSC video disc and start the reproduction suitable for the discriminated video disc.

That is, when a CAV MUSE video disc is mounted on the turntable, the disc rotation speed is set to 2600 in order to determine that the mounted video disc is a CAV MUSE video disc.
Since it is necessary to raise the speed to near rpm and to detect the presence or absence of a playback signal to be played back by this, it is necessary to raise the rotation speed of the above-mentioned disk to near the specified rotation speed, so it takes time to determine and start playback. It took a long time to get there.

Also, the turntable has a CAV MU.
When a video disc other than the SE video disc is loaded, the number of revolutions set once for the MUSE video disc is set to 1800 for the NTSC video disc.
The rpm is reset and the gain of the servo system is reset to a low gain, and the determination is performed again at the number of revolutions of 1800 rpm. Therefore, it takes a long time to start the reproduction as much as the determination is performed again. It was

Also, the reproduction mode immediately after the video disc is mounted on the turntable is automatically initialized to the reproduction mode of the CAV MUSE video disc, and the gain of the servo system becomes the high gain for the MUSE video disc. Since the setting is made, when the NTSC video disc is mounted on the turntable, the NTSC video disc is rotationally controlled at the rotation speed of 2600 rpm,
As a result, the reproduced signal reproduced is amplified with the above-mentioned high gain, which causes a problem that oscillation, abnormal noise or the like occurs at the stage of disc discrimination. This oscillation, abnormal noise, etc. can be prevented by providing a dedicated separate circuit. However, if the dedicated separate circuit is provided, the cost of the video disc reproducing apparatus increases due to an increase in the number of parts.

The present invention has been made in view of the above-mentioned problems, and it is possible to shorten the time required for discriminating a video disk to shorten the time required for starting reproduction, and to provide a dedicated separate circuit. It is an object of the present invention to provide a video disc reproducing apparatus which can prevent oscillation and abnormal noise when discs are discriminated and can reduce the cost without providing the disc.

[0017]

In a video disc reproducing apparatus according to the present invention, when a video disc is mounted on a turntable, the mounted video disc records image information conforming to a high definition television system. It is automatically discriminated whether it is a high-definition video disc that has been recorded or a standard video disc on which image information conforming to the standard television system is recorded, and the reproduction of the high-definition video disc is performed according to the discrimination result. It is a video disc reproducing apparatus for performing reproduction by switching between a high-quality reproduction mode which is a mode and a standard reproduction mode which is a reproduction mode of the standard video disc.

Specifically, the reproduction mode immediately after the video disc is mounted on the turntable is set to the standard reproduction mode, and an optical reading means for reading image information from each video disc is used to read the standard video disc. It has a reproduction mode control means for controlling the movement to the read-in position of the in-information and for controlling the rotation of the video disc mounted on the turntable to a predetermined rotation number for the standard video disc.

Further, by controlling the rotation of the video disc mounted on the turntable to the predetermined number of revolutions, image information conforming to the standard television system can be obtained from the reproduction signal formed by the optical reading means. If it is detected, it is determined that the video disc mounted on the turntable is a standard video disc, the playback control in the standard playback mode is performed, and the standard television is read from the playback signal formed by the optical reading means. If the image information conforming to the John system is not detected, it is determined that the video disc mounted on the turntable is a high definition video disc, and reproduction control means for performing reproduction control in the high definition reproduction mode is provided. Have.

As the high-definition video disc, a CAV high-definition video disc in which image information is recorded at a constant angular velocity and a CV in which image information is recorded at a constant linear velocity.
An LV high-definition video disc exists, and as the standard video disc, a C having image information recorded at a constant angular velocity is used.
There are an AV standard video disc and a CLV standard video disc in which image information is recorded at a constant linear velocity.

Therefore, in the video disc reproducing apparatus according to the present invention, as the reproduction control means, when the reproduction signal formed by the optical reading means is not detected,
It is determined that the video disc mounted on the turntable is the CAV high definition video disc, and the CAV
It has a unit for performing playback control for high-definition video discs. Further, when a reproduction signal formed by the optical reading means is detected, the video disk mounted on the turntable is the CAV standard video disk or the CLV standard based on the detected reproduction signal. It has a unit for discriminating whether the disc is a video disc and performing reproduction control for the discriminated standard video disc. Further, the reproduction signal formed by the optical reading means is detected, and when it is determined that the detected reproduction signal is not the reproduction signal of the CAV standard video disc or the CLV standard video disc, the reproduction signal is detected. A video disc mounted on the turntable is discriminated as the CLV high-definition video disc, and a reproduction control for the CLV high-definition video disc is performed.

[0022]

In the video disc reproducing apparatus according to the present invention, when a video disc is mounted on the turntable, the mounted video disc records image information conforming to a high definition television system (for example, MUSE system). It is automatically discriminated whether the disc is a high-definition video disc or a standard video disc on which image information according to a standard television system (for example, NTSC system) is recorded. It is a video disc reproducing apparatus for performing reproduction by switching between a high definition reproducing mode which is a reproducing mode of a high definition video disc and a standard reproducing mode which is a reproducing mode of the standard video disc.

As the high-definition video disc, there are a CAV high-definition video disc in which image information is recorded at constant angular velocity (CAV) and a CLV high-definition video disc in which image information is recorded at constant linear velocity (CLV). As the standard video disc, there are a CAV standard video disc in which image information is recorded by CAV and a CLV standard video disc in which image information is recorded by CLV.

In order to automatically discriminate and reproduce the four types of video discs, in the video disc reproducing apparatus, when the reproduction mode control means mounts the video disc on the turntable, the reproduction mode control means immediately after the mounting. The reproduction mode is set to the standard reproduction mode, the optical reading means is controlled to move to the position for reading the lead-in information of the standard video disc, and the video disc mounted on the turntable is rotated at a predetermined rotation speed for the standard video disc. To control the rotation.

As a result, the optical reading means reads the information recorded on the video disc mounted on the turntable to form a reproduction signal.

Here, the lead-in information of the CLV high-definition video disc, the CAV standard video disc, and the CLV standard video disc is recorded at the same position on the disc. Information is recorded on the outer peripheral side of the position where the lead-in information of each video disc is recorded. Further, in all video discs, the inner surface of the lead-in area where the lead-in information is recorded has a mirror surface on which no information is recorded.

Therefore, when the CAV high-definition video disc is mounted on the turntable, the reading position of the optical reading means immediately after mounting the video disc is initialized to the reading position of the lead-in information of the standard video disc. When reproduction is performed, since the lead-in information of the CAV high-definition video disc is recorded on the outer peripheral side of the lead-in information of other video discs, the reproduction signal is not formed by the optical reading means. Absent.

From the above, the reproduction control means, when the reproduction signal formed by the optical reading means is not detected, the video disk mounted on the turntable is the CAV high-definition video disk. Then, the reproduction control for the CAV high-definition video disk is performed.

On the other hand, the video disc mounted on the turntable is controlled to rotate at a predetermined number of revolutions for a standard video disc, for example, 1800 rpm. The turntable has a CAV standard video disc or CLV.
When a standard video disc is loaded, it takes a short time from the start of rotation, for example, about 1 / th of the above-mentioned predetermined number of rotations.
By detecting the carrier wave of the RF signal of the reproduction signal or the image information after demodulation at a rotation speed of about 900 rpm, which is a rotation speed of about 2, the video disc is
It is possible to determine whether it is a CAV standard video disc or a CLV standard video disc.

From the above, when the reproduction control means determines that the video disc mounted on the turntable is not a CAV high-definition video disc, the reproduction control means determines that the video disc is CV based on the reproduction signal.
It is discriminated whether the disc is an AV standard video disc or a CLV standard video disc, and reproduction control for the discriminated standard video disc is performed.

Then, the reproduction control means detects the reproduction signal formed by the optical reading means. The detected reproduction signal is the reproduction signal of either the CAV standard video disc or the CLV standard video disc. If it is determined that it is not, the only video disc that remains as the determination target is the CLV high-definition video disc.
The video disc mounted on the turntable is C above.
It is determined that the LV is a high-definition video disc, and reproduction control for the CLV high-definition video disc is performed.

In order to determine that the video disc mounted on the turntable is a high-definition video disc, the video disc must be controlled to rotate at a specified rotation speed of the high-definition video disc, for example, 2600 rpm. No detection can be done.

However, as described above, the position of the optical reading means immediately after the mounting of the video disc is set to the lead-in position of the standard video disc, and the rotation is controlled to the rotation speed (1800 rpm) for the standard video disc. Thus, it is possible to determine that the CAV high-definition video disc is a CAV high-definition video disc even if the reproduction signal is not detected even in the initial rotation state of about 900 rpm. It is possible to determine whether the video disc is a standard video disc, and it is possible to determine that it is a CLV high-definition video disc except for these.

Therefore, each video disc can be immediately discriminated in a short time after the video disc is mounted on the turntable, and the time required for starting the reproduction can be greatly shortened.

Further, since the reproduction mode immediately after mounting the video disc on the turntable is the standard reproduction mode, the gain of the servo system is set to a low gain for the standard video disc. Therefore, gain over does not occur, and inconveniences such as oscillation and abnormal noise at the time of disc discrimination can be prevented. Therefore, it is possible to omit a separate dedicated circuit for preventing the above-mentioned oscillation and abnormal noise,
By reducing the number of parts, the cost of the video disk reproducing device can be reduced.

[0036]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a video disc reproducing apparatus according to the present invention will be described in detail below with reference to the drawings.

The video disc reproducing apparatus according to the present embodiment is a video disc reproducing apparatus which automatically discriminates the type of the mounted video disc and reproduces it. As shown in FIG. 1, the video disc reproducing apparatus is mounted on the turntable. Video disc 1
A spindle motor 2 for controlling the rotation of the motor at a predetermined rotation speed,
It has a spindle servo circuit 3 for controlling the rotation of the spindle motor 2 at the predetermined number of rotations.

Also, an optical pickup 4 for reproducing recorded information from the video disc 1 whose rotation is controlled at the predetermined number of revolutions, and a sled motor 6 for moving the optical pickup 4 in the radial direction of the disc through a sled shaft 5. And a servo block 7 for performing servo control of each part such as tracking servo and focus servo based on the reproduction signal reproduced by the optical pickup 4, and a tracking traverse based on the reproduction signal reproduced by the optical pickup 4. And a tracking traverse detection circuit 8 for detecting

The video block 9 which forms image data based on the reproduction signal reproduced by the optical pickup 4 and supplies the image data to a monitor device and the tracking traverse signal from the tracking traverse detection circuit 8 are used. The MUSE / LD discrimination circuit 10 for discriminating the type of the mounted video disc, and the above MUSE
/ LD discriminating circuit 10 and a system controller 11 for controlling reproduction of each part according to the discrimination result.

A video disc in which image information is reproduced by such a video disc reproducing device is a high-definition television system MUSE (Multiple Sub-N).
MUSE video disc on which image information is recorded by yquist Sampling Encoding system and NTSC on which image information is recorded by NTSC system which is a standard television system
There is a video disc.

Further, the above MUSE video disc includes
CAVM in which image information is recorded at a constant angular velocity (CAV)
There are USE video discs and CLVMUSE video discs in which image information is recorded at a constant linear velocity (CLV). In addition, the above NTSC video disc contains CAV.
CAV video disc on which image information is recorded and CL
There is a CLV video disc on which image information is recorded in V.

The video disc reproducing apparatus according to the present embodiment is adapted to automatically discriminate and reproduce the above four types of video discs by the routine shown in the flowchart of FIG. This flowchart starts when the device is mounted, and the process proceeds to step S1.

In step S1, the system controller 11 shown in FIG. 1 detects that a video disk is mounted on the turntable and sets the gain of the servo block 7 to a low gain for reproducing the NTSC video disk. While setting, set the optical pickup 4 to the above N
By controlling the rotation of the sled motor 6 so as to move to the recording position of the lead-in information of the TSC video disc, the reproduction mode is set to the standard reproduction mode for reproducing the NTSC video disc, and the process proceeds to step S2.

In step S2, when the optical pickup 4 moves to the recording position of the lead-in information, the system controller 11 rotates the spindle servo so that the system controller 11 is rotated at 1800 rpm which is the specified rotation speed of the NTSC video disk. The spindle motor 2 is rotationally controlled via the circuit 3 and the process proceeds to step S3.

The video disk reproducing apparatus irradiates the video disk with a total of three laser beams, for example, first to third laser beams, and based on the reflected light of each laser beam, reproduction of recorded data, tracking control, focus control, etc. The so-called 3-beam method, which performs servo control of
As shown in FIG. 4, the optical pickup 4 is provided with first to third photodetectors 15 to 17 for receiving the reflected light of each laser beam.

The first and third photo detectors 15,
Reference numeral 17 denotes a photodetector for detecting a tracking error, which receives reflected light of the first and third laser beams at their central portions to form a reproduction signal, which is transmitted through a servo block 7 to a tracking traverse detection circuit. Supply to 8.

The second photodetector 16 is a photodetector for detecting a focus error, an RF signal, and recording data, and the light receiving area is equally divided into four (light receiving area A).
.About.D), which is a four-division photo detector. The second photodetector 16 receives the reflected light of the second laser beam in each of the light receiving areas A to D to form a reproduction signal, which is tracked via the servo block 7 and the servo block 7. The video signal is supplied to the traverse detection circuit 8 and the video block 9.

Tracking traverse detection circuit 8
Has a configuration as shown in FIG. 4, and the reproduction signals from the first and third photodetectors 15 and 17 are respectively supplied to a comparator 18, and the reproduction signals from the second photodetector 16 are supplied. Are respectively supplied to the adder 21.

The comparator 18 has a level difference between the level (E) of the reproduction signal formed by the first photodetector 15 and the level (F) of the reproduction signal formed by the third photodetector 17 ( By detecting EF), a tracking error signal as shown in FIG. 5A is formed, and this is supplied to the comparator 20 via the bandpass filter (BPF) 19.

The tracking error signal formed by the comparator 18 is output from the output terminal 24 during normal reproduction.
Is supplied to the system controller 11 via the.
The system controller 11 controls the servo block 7 based on the tracking error signal so as to correct the tracking error. As a result, it is possible to always reproduce recorded data with accurate tracking.

The adder 21 reproduces each reproduction signal (A to A) formed in each light receiving region of the second photodetector 16.
By performing addition processing (A + B + C + D) on each of D), a so-called RF signal as shown in FIG. 5B is formed, and this is supplied to the LPF 22. The LPF 22 is
By smoothing the RF signal as shown in FIG. 5C, a detection level serving as a reference level when detecting the tracking traverse signal is formed and output. This detection level is divided by the resistor 23 to a proper level and supplied to the comparator 20.

As shown in FIG. 5D, the comparator 20 compares the tracking error signal with the detection level to form a tracking traverse signal as shown in FIG. 5E, This is supplied to the MUSE / LD discrimination circuit 10 via the output terminal 25.

Since the tracking traverse detection circuit 8 as described above forms the detection level based on the RF signal, as shown in FIG. Even if the tracking error signal fluctuates in level, the tracking traverse is performed by using an RF signal whose level fluctuates in the same manner as the level fluctuation of the tracking error signal, that is, a detection level which fluctuates following the level fluctuation of the tracking error signal. Can be detected.

Therefore, even if the amount of reflected light varies due to the difference in the format or the like, the tracking traverse can always be detected using the detection level of the proper level, and the tracking traverse can always be detected accurately. be able to.

Here, referring to FIG. 3, the CLVMUS
The lead-in tracks 1a of the E video disc, the CAV video disc, and the CLV video disc are recorded at the same position of 53.5 mm or less from the center of the disc.
Lead-in track 1a is 73m from the center of the disc
It is recorded at a position of m or more and 74.5 mm or less. That is, the lead-in track 1a of the CAVMUSE video disc is recorded on the outer peripheral side of the lead-in track of another video disc.

Further, all video discs have a mirror surface on the inner circumference side of the lead-in track, on which no information is recorded.

Therefore, as described above, the reproduction mode when the video disc is mounted is initialized to the standard reproduction mode, and the optical pickup 4 is controlled to move to the recording position of the lead-in track of the NTSC video disc for reproduction. When a CAVMUSE video disc is mounted on the turntable, the lead-in track of the CAVMUSE video disc is recorded on the outer peripheral side of the lead-in track of another video disc. No reproduction signal is formed by the pickup 4. Therefore, in this case, the tracking traverse detection circuit 8 does not form the tracking traverse signal.

Therefore, in step S3, the MUSE / LD discrimination circuit 10 shown in FIG. 1 detects the presence / absence of the tracking traverse signal from the tracking traverse detection circuit 8 and outputs the detection output. Supply to. The system controller 11 proceeds to step S4 when the tracking traverse detection circuit 8 detects the tracking traverse signal, and proceeds to step S7 when the tracking traverse signal is not detected.

In step S7, the tracking traverse signal is not detected, which indicates that the lead-in track is not recorded at the initial setting position of the optical pickup 4. Therefore, the system controller 11 determines that the video disc mounted on the turntable is a CAV MUSE video disc, and controls each unit to perform reproduction for the CAV MUSE video disc. The routine of the flowchart ends.

Next, when a CAV video disk or a CLV video disk is mounted on the turntable, it takes a short time from the start of rotation, for example, 900 rpm, which is about half the predetermined rotation speed. By detecting the carrier wave of the RF signal of the reproduction signal, the image information after demodulation, or the like at a certain number of rotations, whether the video disk is a CAV video disk or CL
It is possible to determine whether it is a V-video disc. Since it can be determined that the CAV video disc or the CLV video disc, the video disc determined not to be the CAV video disc or the CLV video disc can be necessarily determined to be the CLVMUSE video disc. .

Therefore, in step S4, the MUSE / LD discrimination circuit 10 determines that the video disc mounted on the turntable is based on the reproduction information of the lead-in track formed by the video block 9. , NTSC video disc. Then, this determination result is supplied to the system controller 11.

When the system controller 11 receives the determination result that the video disk mounted on the turntable is not the NTSC video disk in step S4, the video disk mounted on the turntable is inevitably supplied. Since it is a CLVMUSE video disc, the process proceeds to step S8, and the CLVMU
The respective parts are controlled so as to perform the reproduction for the SE video disc, and the routine of this flowchart is finished.

Further, the system controller 11 is
In step S4, when the determination result that the video disc mounted on the turntable is the NTSC video disc is supplied, the process proceeds to step S5.

In step S5, the MUSE / L
Based on the reproduction information of the lead-in track formed by the video block 9, the D discriminating circuit 10 discriminates whether or not the video disc mounted on the turntable is a CAV video disc, and this discrimination is carried out. The result is supplied to the system controller 11.

When the system controller 11 determines in step S5 that the video disc mounted on the turntable is a CAV video disc, the system controller 11 proceeds to step S6 to reproduce the CAV video disc. When the video disc mounted on the turntable is determined to be a CLV video disc in step S5, the routine proceeds to step S9, and the CLV video disc is controlled. Each part is controlled so as to perform the reproduction for the reproduction, and the routine shown in this flowchart is ended.

As described above, in the video disc reproducing apparatus according to the present embodiment, the position of the optical pickup 4 immediately after mounting the video disc is set to the lead-in position of the NTSC video disc, and the rotation speed for the NTSC video disc is set. By controlling the rotation to (1800 rpm), it is possible to determine that the disc is a CAVMUSE video disc if the reproduction signal is not detected, and the CAV is based on the reproduction signal.
It is possible to determine whether it is a video disc or a CLV video disc.
It can be determined that the disc is a VMUSE video disc.

The discrimination of each video disc is 9
All can be discriminated in the initial rotation state of about 00 rpm.

Therefore, each video disc can be immediately discriminated in a short time after the video disc is mounted on the turntable, and the time required for starting the reproduction can be greatly shortened.

Since the reproduction mode immediately after mounting the video disc on the turntable is the standard reproduction mode, the gain of the servo block 7 is also set to a low gain for the standard video disc. Therefore, gain over does not occur, and inconveniences such as oscillation and abnormal noise at the time of disc discrimination can be prevented. Therefore, it is possible to omit the dedicated separate circuit for preventing the above-mentioned oscillation, abnormal noise, etc., and it is possible to reduce the cost of the video disk reproducing apparatus by reducing the number of parts.

The above NTSC video disc and M
Identification information indicating whether the video disc is CLV or CAV and identification information indicating whether the video disc is MUSE or NTSC are recorded on the USE video disc. Therefore, the determination result automatically made as described above may be used as the temporary determination, and the final determination may be performed when the identification information is reproduced.

The MUSE / LD discriminating circuit 10 is also provided.
Is a video disc mounted on the turntable based on the reproduction signal demodulated by the video block 9.
It is decided to discriminate between the CAV video disc and the CLV video disc. This is R formed by the adder 21 of the tracking traverse detection circuit 8.
The F signal may be supplied to the MUSE / LD discrimination circuit 10, and the MUSE / LD discrimination circuit 10 may discriminate based on the carrier wave of the RF signal.

The CAV video disk or C
It was decided that the LV video disc recorded image information conforming to the NTSC system.
It goes without saying that even a video disc on which image information conforming to another standard television system such as the AL system and SECAM system is recorded can be automatically discriminated as described above.

[0073]

Since the video disc reproducing apparatus according to the present invention can shorten the time required for discriminating the video disc mounted on the turntable, the time required to start the reproduction can be shortened. be able to.

Further, the reproduction mode immediately after mounting the video disc is set to the standard reproduction mode, and the gain of the servo system is set to a low gain for the standard video disc. Therefore, gain over does not occur and oscillation at disc discrimination is performed. ，
Inconvenience such as abnormal noise can be prevented. Therefore, it is possible to omit the dedicated separate circuit for preventing the above-mentioned oscillation, abnormal noise, etc., and it is possible to reduce the cost of the video disk reproducing apparatus by reducing the number of parts.

[Brief description of drawings]

FIG. 1 is a block diagram of a video disc reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a flow chart for explaining the operation of the video disc reproducing apparatus in the above embodiment.

FIG. 3 is a perspective view of a video disc for explaining a difference in recording position of lead-in information recorded on the video disc mounted in the video disc reproducing apparatus according to the embodiment.

FIG. 4 is a block diagram of a tracking traverse detection circuit provided in the video disk reproducing device according to the embodiment.

FIG. 5 is a waveform diagram of each part for explaining a tracking traverse detection operation of the tracking traverse detection circuit.

[Explanation of symbols]

 1 Video Disc 2 Spindle Motor 3 Spindle Servo Circuit 4 Optical Pickup 5 Thread Axis 6 Thread Motor 7 Servo Block 8 Tracking Traverse Detection Circuit 9 Video Block 10 MUSE / LD Discrimination Circuit 11 System Controller

Claims (2)

[Claims] 1. When a video disc is mounted on the turntable, the mounted video disc is a high-definition video disc on which image information conforming to the high-definition television system is recorded, or a standard television system. It automatically discriminates whether or not it is a standard video disc on which image information according to the above is recorded, and according to the discrimination result, the high-definition reproduction mode which is the reproduction mode of the high-definition video disc and the reproduction of the standard video disc. A video disc reproducing device for reproducing by switching the standard reproduction mode, which is a mode, wherein the reproduction mode immediately after the video disc is mounted on the turntable is the standard reproduction mode, and image information is read from each of the video discs. Move the optical reading means to read the lead-in information reading position of the standard video disc. Control means for controlling the rotation of the video disc mounted on the turntable to a predetermined rotation number for the standard video disc, and the video disc mounted on the turntable for the predetermined rotation number. When the image information conforming to the standard television system is detected from the reproduction signal formed by the optical reading means by controlling the rotation of the video disc, the video disc mounted on the turntable is the standard video disc. If the image information conforming to the standard television system is not detected from the reproduction signal formed by the optical reading means, it is mounted on the turntable. Disc is judged to be a high-definition video disc, and the disc is replayed in the above high-definition playback mode. Video disc reproducing apparatus and a reproduction control means for controlling. 2. The high-definition video disc is a CAV high-definition video disc in which image information is recorded at a constant angular velocity and a CLV high-definition video disc in which image information is recorded at a constant linear velocity, and the standard video disc is A CAV standard video disc on which image information is recorded at a constant angular velocity and a CLV standard video disc on which image information is recorded at a constant linear velocity, wherein the reproduction control means detects a reproduction signal formed by the optical reading means. If not, it is determined that the video disc mounted on the turntable is the CAV high-definition video disc, the reproduction control for the CAV high-definition video disc is performed, and the reproduction formed by the optical reading means is performed. When a signal is detected, it is mounted on the turntable based on the detected reproduction signal. It is discriminated whether the video disc is the CAV standard video disc or the CLV standard video disc, the reproduction control for the discriminated standard video disc is performed, and the reproduction signal formed by the optical reading means is detected. However, if it is determined that the detected reproduction signal is not the reproduction signal of the CAV standard video disc or the CLV standard video disc, the video disc mounted on the turntable is the CLV high-definition video disc. 2. The video disc reproducing apparatus according to claim 1, wherein it is determined that the CLV is present and the reproduction control for the CLV high-definition video disc is performed.