JPH0464970A - Recording disk reproducing device - Google Patents

Abstract

PURPOSE:To shorten the control leading-in time of a spindle motor after jump to make picture easy to see at the time of special reproducing by accelerating and decelerating the spindle motor in the jumping direction of a pickup. CONSTITUTION:When a pickup 2 is jumped from the inner periphery to the outer periphery on a recording disk, the regular revolving speed is reduced in the case of the recording disk having a certain linear speed because the radius of reproducing is extended, and the output of a second signal generating circuit 19 is to be a brake torque signal to a spindle motor 14. When the pickup is jumped from the outer periphery to the inner periphery, the output of the circuit 19 is to be an acceleration torque signal. When the jump operation is completed, a control circuit 17 outputs a servo loop close command to a tracking servo circuit 15 to trace the pickup 2 on tracks of the recording disk 1. When the tracking servo is settled after the end of jump and the spindle motor 14 reaches the regular revolving speed, the output of a time base correcting circuit 4 is stored in a field memory 5.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a recording disc playback device such as a video disc player capable of variable speed playback.

2. Description of the Related Art In recent years, 1ti2 disc playback devices have become popular as video disc players and the like. In particular, with this video player, with the decline in the price of digital memory, special playback such as double-speed playback and slow-speed playback on a recording disk with a constant linear velocity force, which was previously impossible, is now possible by applying memory to the image feel. It has been realized.

This kind of special playback consists of two operations: tracing the pickup to the track to reproduce the information, writing the reproduced image to the field memory, and moving the pickup in the radial direction of the recording disk while reading out the image written to the field memory. This is done by repeatedly moving (hereinafter referred to as jumping). Therefore, the time in the trench where the image signal is accurately reproduced from the end of the jump is these 'm TA
Affects the output image switching time during IJ production.

Therefore, the time from the end of this jump until the image signal is accurately reproduced is l? It is desired to introduce a recording disk reproducing apparatus that shortens Jt and shortens the switching time of output images during special reproduction.

Hereinafter, the above-mentioned conventional recording disk reproducing apparatus will be explained with reference to the drawings.

FIG. 4 is a block diagram showing a four-color configuration of a conventional recording disk reproducing apparatus. In FIG. 4, 1 is a recording disk, and 2 is a pickup, which reads the signal by irradiating the recording disk 1 with a laser. 3 is a video signal demodulation circuit which demodulates the signal read by the pickup 2 into a composite video signal. Reference numeral 4 denotes a time axis correction circuit which suppresses the syssocou component contained in the composite video signal. 5 is a field memory capable of storing one field of composite video signals. 6 is a first switch provided after the field memory 5; 7 is the first switch 6;
This is a video signal output terminal provided at the subsequent stage. Either the output of the axis correction circuit 4 or the output of the field memory 5 is outputted to the video signal output terminal 7 by the first switch 6 .

Reference numeral 8 denotes a horizontal synchronization signal separation circuit which separates the horizontal synchronization signal from the composite video signal output from the video signal demodulation circuit 3. 9 is a reference synchronization signal generation circuit, and 10 is a phase comparator to which the outputs of the horizontal synchronization separation circuit 8 and the reference synchronization signal generation circuit 9 are input.

The phase comparator 10 receives the horizontal synchronization signal from the horizontal synchronization signal separation circuit 8 and the reference synchronization signal from the reference synchronization signal generation circuit 9, and outputs the phase difference component thereof. 1
1 is a signal generating circuit which outputs a signal proportional to the output of the phase comparator 10; Reference numeral 12 denotes a second switch provided after the signal generation circuit 11. The second switch 12 turns the output of the signal generation circuit 11 ON-OFF and inputs it to the spindle motor drive circuit 13. A spindle motor 14 rotates the recording disk 1 by the output of the spindle motor drive circuit 13.

Reference numeral 15 denotes a tracking servo circuit, and the pickup 2 races the signals 1 to 1 on the recording disk 1 according to the output of this tracking servo circuit. Reference numeral 16 denotes a jump circuit that causes the pickup 2 to jump between any signal I and rack of the recording disk 1. A control circuit 17 controls the field memory 5, the first switch 6, the second switch 12, the tracking sabot circuit 15, and the jump circuit 16.

The operations of the normal playback and special playback of the recording disc playback apparatus configured as described above will be explained below.

In FIG. 4, when a pickup 2 converts a signal recorded on a recording disk 1 into an electric signal, the output of the pickup 2 is demodulated into a composite video signal by a video signal demodulation circuit 3.

Furthermore, a horizontal synchronization signal is extracted from this composite video signal by a horizontal synchronization signal separation circuit 8 and input to a phase comparator 10. The output of the reference synchronization signal generation circuit 9 is also input to the phase comparator 10, and the phase difference between the phase of the horizontal synchronization signal and the phase of the output of the reference synchronization signal generation circuit 9, or 4H, is input.

The output of the phase comparator 10 is input to the signal generation circuit 11,
The output of the q1 generation circuit 11 is input to the spindle motor drive circuit 13 through the second switch 12, and the output of the spindle motor 1 drive circuit 13 is input to the spindle motor 14.
rotates. That is, the rotation speed of the spindle motor 14 is controlled so that the signal generated by the reference synchronization signal generation circuit 9 and the output of the horizontal synchronization signal separation circuit 8 are in phase. now,
If the oscillation frequency of the reference synchronization signal generation circuit 9 is set to the horizontal scanning frequency of the regular video signal, the spindle motor 14 is controlled so that the output of the video signal demodulation circuit 3 becomes the frequency of the regular video signal. Ru. However, the output of the video signal demodulation circuit 3 may be affected by the eccentricity of the recording disk 1, etc.
It contains high-frequency jitter components that cannot be sufficiently removed by controlling the spindle motor 14, and if left as is,
You can't watch it with a TV receiver. Therefore, the time axis correction circuit 4 is used to remove the jitter component.

The time axis correction circuit 4 removes high frequency jitter components,
The reproduced signal, which has become a regular video signal, is input to the first switch 6 and the field memory 6. The first switch 6 selects the output of the axis positive/positive circuit between II (II) and the output of the field memory 5 and outputs it to the video signal output terminal 7. It can be played in a container.

During normal playback, the control circuit 17 issues a servo loop close command to the tracking servo circuit 15 to cause the pickup 2 to trace the track on the recording disk 1. Second
Connect the switch 12 to the a side and switch the spindle motor 14.
is set to the normal rotation speed, and at the same time, the first switch 6 is connected to the a side, and the recorded information of the recording disk reproduced as a normal video signal is outputted to the video signal output terminal 7 as the output of the N1 axis correction circuit 4. do.

During special playback, the shuffling control circuit 17 issues a servo loop close command to the l/racking servo circuit 15 to trace the pink-up 2 to the track of the recording disk 1. Then, connect the second switch 12 to the a side to set the spindle motor 14 to the normal rotation speed, store the output of the time axis correction circuit 4 in the field memory 5, connect the first switch 6 to the 6 side, The output of the field memory 6 is output to the video signal output terminal 7.

Next, the control circuit 17 issues a servo loop close command to the tracking servo circuit 16, and simultaneously issues a jump command to the jump circuit 16. When receiving a jump command, the jump circuit 16 moves the pickup 2 in the radial direction of the recording disk 1 for a certain period of time to complete the jump operation. During the jump operation, the output of the pickup 2 does not become a regular signal, so the output of the horizontal synchronizing signal separation circuit 8 is unreliable during the jump operation, and therefore the spindle motor 14 cannot be controlled. Therefore, the control circuit 17
The switch 12 is set to the b side, and the spindle motor 14 is rotated by inertia (7). During the Ushida jump operation, the video Iha number will not be the regular number 151, so this [11] field memory 6 imported before the jump
continues to be output to the video signal output terminal 7.

When the jump operation is completed, the control circuit 17 issues a servo loop closing command to the racking servo circuit 15 again,
Trace the pickup 2 to the 1-rack of the recording disk 1. After the jump is completed, the tracking servo is stabilized and the spindle motor 14 reaches the normal rotational speed, and then the output of the time axis abstraction circuit 4 is stored in the field memory 5 again.

Special playback can be achieved by repeating the above operations. FIG. 5 is a flowchart showing the operation of the control circuit 17 during special playback of a conventional recording disk playback device.

Figure 6 shows the movement of the pickup during special playback in a conventional recording disc playback device. realizable. Furthermore, by changing the number and direction of jump trunks, it is possible to change the playback speed, reverse playback, etc.

FIG. 7 shows input signals to the spindle motor drive circuit 13 during normal playback and special playback of a conventional recording disk playback device. Changes in this signal directly affect the spindle motor 1.
This is the change in torque that occurs at 4. Normally, during each life, a signal that cancels out slight lateral and windage losses and a signal that cancels out the phase error due to eccentricity of the recording disk 1 are combined to form a sine wave signal as shown in FIG. 7a. During special playback,
The second switch 12 is set to the b side at the timing of the jump, and the spindle motor 14 rotates due to inertia, so the signal during that time becomes 0. When the second switch 12 is turned to the a side again after the jump, the torque that should have been generated by the spindle motor 14 during the jump was not generated, so it took a long time to complete the pull-in with a large phase error. It takes.

Problems to be Solved by the Invention However, in a recording disc playback device with such a configuration, a control error occurs because the spindle motor rotates due to the inertia of the recording disc during a jump, and after the jump, the spindle motor control becomes unstable. It takes time to pull in. As a result, it takes a long time to store the next playback screen in the field memory, and the screen changes are infrequent, and the screen is difficult to see during special playback.

The present invention has been made in view of the above-mentioned problems of the prior art, and provides a recording disk reproducing apparatus that shortens the time required to control the spindle motor after a jump is completed, and allows the screen to be easily viewed during special reproduction.

Means for Solving the Problems In order to solve the above problems, the recording disk reproducing apparatus of the present invention includes a pickup that converts a signal recorded on the recording disk into an electric signal, a motor that rotates the recording disk, and the pickup. a jump circuit that drives the pickup in the radial direction of the recording disk to move the pickup from the track on which it is trained to a different track, and a phase of a synchronization signal recorded on the recording disk and a reference for rotation control of the motor. a first signal generation circuit that generates a signal to rotate the motor based on the output of the phase comparator; and a first signal generation circuit that generates an output while the jump circuit is in operation. (i) an adder for adding the outputs of the second signal generation circuit and the second signal generation circuit;
) A drive circuit that generates a signal to rotate the motor, and the second signal generating circuit generates a signal to decelerate the recording disk when the njJ pickup jumps to the outer periphery of the recording disk. r) When the iJ pickup jumps to the inside of the recording disk, a signal for accelerating the recording disk is generated.

In the present invention, with the above-described configuration, while the pink-up is jumping from the inside to the outside on the recording disk with a constant linear velocity,
Since deceleration torque is applied to the spindle motor that rotates the recording disk, the rotational speed of the spindle motor approaches the normal rotational speed after the jump operation. Further, when the pickup performs a jump operation from the outside to the inside, accelerating torque is applied to the spindle motor, so that the rotational speed of the spindle motor approaches the normal rotational speed when the jump operation is completed. therefore,
It is possible to provide a recording disk reproducing device in which the screen is easily seen even during special reproduction by shortening the pull-in time of the bow control of the spindle motor control after jumping and making the screen change more dense.

Embodiment Hereinafter, a recording disk reproducing apparatus according to an embodiment of the present invention will be described.
This will be explained with reference to the drawings.

FIG. 1 shows a recording disk reproducing device 11G according to an embodiment of the present invention.
FIG.

In the figure, 1 is a recording disk, and 2 is a pickup that reads the signal by irradiating the recording disk 1 with a laser. 3 is a video signal demodulation circuit which demodulates the signal read by the pink-up 2 into a composite video signal. Reference numeral 4 denotes a time axis correction circuit which suppresses the Zinocou component contained in the composite video signal. 5 is a field memory that can store one field of a composite video signal.

21 is a switch provided after the field memory 5, and γ is a video signal output terminal provided after the switch 21. Either the output of the time axis correction circuit 4 or the output of the field memory 6 is outputted to the video signal output terminal 7 by a switch 21.

A horizontal synchronization signal separation circuit 8 separates a horizontal synchronization signal from the composite video signal output from the video signal demodulation circuit 3. Reference numeral 9 denotes a reference synchronization signal generation circuit, and reference numeral 10 denotes a phase comparator to which the outputs of the horizontal synchronization signal circuit 8 and the reference synchronization signal generation circuit 9 are input.

The phase comparator 1o receives the horizontal synchronization signal from the horizontal synchronization signal separation circuit 8 and the reference synchronization signal from the reference synchronization signal generation circuit 9, and outputs the phase difference component thereof. 1
A first signal generating circuit 8 outputs a signal proportional to the output of the phase comparator 1i10.

Reference numeral 19 denotes a second signal generating circuit, which can generate any desired output for any desired time. An adder 20 adds the outputs of the first signal generation circuit 18 and the second signal generation circuit 19 and outputs the result. 13 is a spindle motor drive circuit and adder 2
The spindle mocra is driven by the output of 0. A spindle motor 14 rotates the recording disk 1 by the output of a spindle motor drive circuit 13 which is proportional to the output of the adder 2o.

A tracking servo circuit 15 causes the pickup 2 to trace the signal track of the recording disk 1. .

A jump circuit 16 causes the pickup 2 to jump between arbitrary signal tracks on the recording disk. 17 controls the operations of the switch 21, the field memory 5, the first signal generation circuit 18, the second signal generation circuit 19, the tracking servo circuit 16, and the Jasip circuit 16 at one time.

The operations of the normal playback and special playback of the recording disk playback apparatus of the present invention configured as described above will be explained below.

During normal playback, the operation is exactly the same as before. That is, the conventional first switch 6 is replaced with the switch 21 of this embodiment, the signal generating circuit 11 is similarly replaced with the first signal generating circuit 18, and the conventional second switch 12 is set to the a side. If the output of the signal generating circuit is set to 0, the configuration and operation of the conventional example and this embodiment are completely the same, so a description of the operation during normal reproduction will be omitted here.

During special playback, the control circuit 17 first issues a servo loop closing command to the tracking servo circuit 16 to cause the pickup 2 to trace one recording circle 1i1j (1 track). O
Since the command to FF is issued, the input to the adder 20 is based on the horizontal synchronization signal recorded on the recording disk 1.
Only the output of the first signal generation circuit 18 is output, and the adder 20
The spindle motor drive circuit 13 sets the spindle motor 14 to a normal rotational speed, and the signal read by the pickup 2 is demodulated by the video signal demodulation circuit 3 and stored in the field memory 5 via the time axis correction circuit 4. Then, the control circuit 17 connects the switch 21 to the b side and outputs the output of the field memory 5 to the video signal output terminal γ.

Next, the control circuit 17 issues a servo loop open command to the tracking servo circuit 15, and simultaneously issues a jump command to the jump circuit 16. When receiving a jump command, the jump circuit 16 moves the pink-up 2 in the radial direction of the recording disk 1 for a certain period of time to complete the jump operation. During the jump operation, the output of the pickup 2 is not a regular signal, so the output of the horizontal open Jυ signal separation circuit 8 during that period is HI! I')
14(7)a (I control cannot be performed. Therefore, the control circuit 17 issues an output OFF command to the first signal generating circuit 18.

- The force control circuit 1 issues an output command to the second signal generation circuit 19. At this time, if the jump operation of the pickup 2 is from the inner circumference to the outer circumference of the recording disk, the playback radius will be large in the case of a recording disk with a constant linear velocity, so the normal rotation speed will naturally be small, and the second The output of the signal generation circuit 19 does not serve as a brake torque signal to the spindle motor 14. Conversely, if the jump operation of the pickup 2 is from the outer circumference to the inner circumference, the normal rotation speed after the jump will be large. Therefore, the output of the second signal generating circuit 19 becomes a signal that becomes an accelerating torque for the spindle motor 14.

FIG. 2 shows the rotational speed of the recording disk 1 being rotated by the spindle motor 14 and the state of torque applied to the spindle motor 14 at this time.

FIG. 2(a) is a characteristic diagram (corresponding to the conventional example) showing the relationship between the reproducing radius and the rotation speed when there is no signal from the second signal generating circuit 19, and FIG. 2(b) is a characteristic diagram showing the relationship between the reproducing radius and the rotation speed. FIG. 2 is a characteristic diagram showing the relationship between the torque generated by the spindle motor 14. FIG. 1
If pickup 2 jumps from point to point 2, 1 to 2
As shown in Figure 2 (1)), the torque is 0 between the recording disk 1
As shown in FIG. 2(a), the rotational speed gradually decreases.

Here, the dotted line portion is a characteristic curve representing the normal rotational speed of a recording disk with a constant linear velocity. When the pickup 2 completes jumping to the 2nd point, the normal rotational speed is 3 points in this playback radius, so the rotational speed at the 2nd point is too high and the
), it requires a large brake torque and takes a long time to reach the 4th point where the normal rotation speed is reached.

Next, when the second signal generation circuit 19 is operating, brake torque is generated during the jump, so the rotation speed is as shown in Figure 2 (
While the pickup 2 is jumping from point 5 to point 6 as shown in Figure 2 (C), brake torque is generated as shown in (1), and the rotational speed at point 6 after the jump is 7, which is the normal rotational speed due to this regeneration radius. The time for the 8 point call, which is very close to the point and the normal rotation speed after the jump, is shortened.

Now, since the video signal does not become a regular signal during the jump operation, the output of the field memory 5 captured before the jump continues to be output to the video signal output terminal 7 during this time.

When the jump operation is completed, the control circuit 1a again issues a servo loop close command to the tracking servo circuit 15 to cause the pickup 2 to trace the track on the recording disk 1. After the jump is completed, the tracking servo is stabilized and the spindle motor 14 reaches the normal rotational speed, and then the output of the time axis correction circuit 4 is stored in the field memory 5 again.

Special reproduction can be achieved by repeating the above operations (7 times). FIG. 3 is a flowchart showing the operation of the control circuit 1 during special reproduction of the recording disk reproducing apparatus of the present invention.

As mentioned above, during the jump operation, the second signal generating circuit 19
It will be more effective if the following method is used to operate the spindle motor 14 and speed up the settling of the spindle motor 14.

(2) Set the output J of the second deflection generating circuit 19 arbitrarily depending on the direction of the current. In other words, when jumping from the inner circumference to the outer circumference, the rotational speed decreases, and when jumping from the outer circumference to the inner circumference, the rotational speed increases, but when the recording disk 1 is rotating, it naturally changes due to horizontal axis and windage losses. The rotation speed decreases. Therefore, in order to obtain the desired rotational speed after compensating for shaft lateral and windage losses, the output of the second signal generating circuit 19 is made larger when jumping from the outer circumference to the inner circumference than when jumping from the inner circumference to the outer circumference. I will make it happen.

■ Second signal generation circuit 1 depending on the playback position before jumping.
Set the output of 9 arbitrarily. In other words, even if you jump by the same amount, the change in normal rotational speed between the inner and outer circumferences of the recording disk is larger on the inner circumference and smaller on the outer circumference, so it is better to make a jump action on the inner circumference than when you make a jump action on the outer circumference. The output of the second signal generation circuit is made large in order to cope with large changes in rotational speed.

(2) The output of the second signal generation circuit 19 is arbitrarily set depending on the jump amount. That is, when there are many jumps 11, the difference in the rotational speed before and after the jump is large, and when the amount of jumps is small, the difference in the rotational speed before and after the jump is also small, so the outputs of the second signal generation circuit are set to be large and small, respectively.

Effects of the Invention As described above, in the recording disk reproducing apparatus of the present invention, the second signal generating circuit, which operates while the pickup is jumping, generates a signal for accelerating the spindle motor when the pickup jumps from the external 1 to the inside. When the pickup jumps from the inside to the outside, a signal is generated to decelerate the spindle motor. Therefore, when performing a jump operation of the pickup on a recording disk with a constant linear velocity, it is difficult to determine whether the pickup is on the outer circumference or the circumference. Even when jumping, the time required to control the spindle motor after the jump can be reduced. Therefore, it is possible to provide a recording disc playback device whose screen is easy to see during special playback.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a recording disk reproducing apparatus according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a spindle motor 14 during special reproduction of the recording disk reproducing apparatus according to an embodiment of the present invention.
FIG. 3 is a flowchart showing the operation of the control circuit 1γ during special playback of the recording disc playback device in the embodiment of the present invention.
FIG. 4 is a block diagram showing the configuration of a conventional recording disc reproducing apparatus, FIG. 5 is a flowchart showing the operation of the control circuit 17 during special reproduction of the conventional recording disc reproducing BIF, and FIG. 6 is a block diagram showing the configuration of a conventional recording disc reproducing apparatus. FIG. 7 is a plan view showing the movement of the pickup 2 during special playback of the playback device, and FIG. 7 shows the spindle motor drive circuit 13 during normal playback and special playback of the conventional recording disk playback device.
FIG. 3 is a characteristic curve diagram showing a 0 input signal. 1...Record disc, 2...Pickup, 1
0... Phase comparator, 13... Spindle motor drive rotation j114... Spindle motor, 16...
... Jump circuit, 17 ... Control circuit, 18 ... (a1 signal generation circuit, 19 ...
- Second signal generation circuit, 20...adder. Name of agent: Patent attorney Takashi Awano and one other person Funeral map

Claims (1)

[Claims] a pickup that converts a signal recorded on a recording disk with a constant linear velocity into an electric signal; a motor that rotates the recording disk; and a motor that drives the pickup in the radial direction of the recording disk so that the pickup traces. a phase comparator that compares the phase of a synchronization signal recorded on the recording disk with the phase of a reference synchronization signal serving as a reference for rotation control of the motor; a first signal generating circuit that generates a signal to rotate the motor by the output of the jump circuit; a second signal generating circuit that generates an output while the jump circuit is in operation; the first signal generating circuit and the second signal generating circuit; and a drive circuit that generates a signal to rotate the motor based on the output of the adder, and the second signal generation circuit is configured to be configured such that the pickup is connected to the outer periphery of the recording disk. A recording disc characterized in that when the pickup jumps to the inside of the recording disc, a signal is generated to decelerate the recording disc, and when the pickup jumps inside the recording disc, a signal is generated to accelerate the recording disc. playback device.