JP2829967B2 - Information recording disk playback device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of reproducing an information recording disk containing a synchronization signal at a constant linear velocity, by synchronizing a synchronization signal detected from the disk with a synchronization signal independent of the synchronization signal. The present invention relates to an information recording disk reproducing apparatus which has the same and performs phase adjustment of these synchronization signals.

2. Description of the Related Art In recent years, information recording disk playback devices have become widespread in various fields,
Higher performance is also being promoted in consumer devices such as video disk playback devices.

Hereinafter, an example of the above-described conventional information recording disk reproducing apparatus will be described with reference to the drawings.

FIG. 3 shows a block diagram of a conventional video disk reproducing apparatus. In FIG. 3, 31 is a video disk having a constant linear velocity, 32 is a pickup device for reading out signals from the video disk 31, and 33 is a position control for controlling the position of the pickup device 32 in the radial direction of the video disk 31. The device, 34 is a synchronization signal detecting device for detecting the first synchronization signal from the signal read from the video disk 31 by the pickup device 32, and 35 is independent of the first synchronization signal, used for the color back generator 36. A synchronization signal generator for generating a second synchronization signal; 36, a color back generator for displaying a predetermined color on a television screen when the apparatus is being accessed or stopped; and 39, a synchronization signal generator 35. A synchronization device that gives a command and synchronizes the phases of the first synchronization signal and the second synchronization signal.

The operation of the video disk reproducing apparatus configured as described above when switching the television screen from the color back to the reproduction screen after access will be described below as an example.

During the access, a color background is output by the color background generator 36 so that unnecessary images are not displayed on the television screen. The color back generator 36 uses the second synchronization signal, which is independent of the first synchronization signal. This is because, since the video disk 31 has a constant linear velocity, the cycle of the first synchronizing signal during access deviates from a specified cycle and cannot be used as a synchronizing signal for the color back generator 36.

Further, after the access, since the first synchronization signal and the second synchronization signal are out of phase, the reproduction signal including the first synchronization signal is converted from the color back signal including the second synchronization signal as it is. , The synchronization becomes discontinuous, and the television screen is disturbed.

Therefore, in order to prevent the television screen from being disturbed, it is necessary to match the phases of the first synchronization signal and the second synchronization signal. The synchronization signal generator 35 changes the second synchronization signal to the first synchronization signal by changing the cycle of the second synchronization signal by a predetermined length according to a command from the synchronization device 39. Adjust the phase gradually.

Before the synchronization operation, if necessary, the synchronization device 39 converts the time required for the synchronization signal generation device 35 to perform the synchronization operation into the number of tracks, and outputs the position control device.
An instruction is given to 33 to move the reading position of the pickup device 32 by the number of tracks converted in the inner circumferential direction of the video disk 31.

Problems to be Solved by the Invention The above-mentioned synchronization is performed by changing the period of the synchronization signal generated by the synchronization signal generator by a predetermined length from a specified length. If it is taken too much, phenomena such as the TV screen being disturbed and being difficult to see occur. For this reason, in the above-described configuration, there is a problem that it takes a long time to perform synchronization because the predetermined length cannot be made large.

The present invention has been made in view of the above circumstances, and provides an information recording disk reproducing apparatus capable of performing synchronization in a shorter time.

Means for Solving the Problems In order to solve the above problems, an information recording disk reproducing device of the present invention comprises: a position control device for controlling a position of a reproduction position of an information recording disk in a radial direction; A synchronizing signal detecting device for detecting a first synchronizing signal included in the information recording disk, a synchronizing signal generating device for generating a second synchronizing signal independent of the first synchronizing signal, A positional deviation detecting device that detects the magnitude of the positional deviation between the adjacent tracks where the first synchronization signal is recorded, and the magnitude of the positional deviation detected by the positional deviation detecting device. In order to make the phase of the first synchronizing signal closer to the phase of the second synchronizing signal, the number of tracks to be moved is calculated and a synchronizing device for giving a command to the position control device is provided.

According to the present invention, the synchronizing signal is shortened by moving the reproducing position of the information recording disk in the radial direction before or simultaneously with the synchronizing signal generating device adjusting the synchronizing signal phase by the above-described configuration, thereby shortening the synchronizing. You can do it.

Embodiment A video disk reproducing apparatus according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a video disk reproducing apparatus according to a first embodiment of the present invention. In FIG. 1, 11 is a video disk having a constant linear velocity, 12 is a pickup device for reading out signals from the video disk 11, and 13 is a position control device for controlling the position of the pickup device 12 in the radial direction of the video disk 11. , 14 is the pickup device 12
In the synchronization signal detection device for detecting the first synchronization signal from the signal read from the video disk 11, a separate and independent from the first synchronization signal, used for the color back generator 16, a second synchronization signal A synchronizing signal generator that generates, 16 is a color back generator that displays a predetermined color on the television screen when the apparatus is being accessed or stopped, and 17 is a rotation angle detector that detects the rotation angle of the video disc 11 , 18 are positional deviation detecting devices for detecting the magnitude of deviation of the position where the first synchronization signal is recorded between adjacent tracks at the reproduction position of the video disc 11, and 19 is a positional control device 13. And a synchronizing signal generating device 15 for giving a command to the synchronizing signal generating device 15 to adjust the phases of the first synchronizing signal and the second synchronizing signal.

The video disk reproducing apparatus configured as described above will be described below with reference to FIGS. 1 and 2 by taking as an example an operation when switching the television screen from a color back to a reproduction screen after access.

As in the conventional example, when the present apparatus switches from the color back to the reproduction screen after access, in order to prevent the screen from being disturbed, it is necessary to match the phases of the first synchronization signal and the second synchronization signal. is there.

For that purpose, first, the position shift detecting device 18 detects the rotation angle of the video disk 11 detected by the rotation angle detecting device 17 and the timing of the first synchronization signal, at a position on the video disk 11 during reproduction. The magnitude of the deviation of the position of the adjacent track where the first synchronization signal is recorded is detected.

The relationship between the positions where the first synchronization signals are recorded on the adjacent tracks can be considered that the positional deviation is constant when the disk is partially viewed as shown in FIG. Therefore, when there is a displacement, the phase of the first synchronization signal can be arbitrarily changed by moving the reproduction position of the video disk 11 in the radial direction.

Next, the synchronization unit 19 calculates the number of tracks to be moved from the magnitude of the displacement detected by the displacement detection device 18 so that the phase of the first synchronization signal approaches the phase of the second synchronization signal. Then, an instruction is given to the position control device 13. Then, the position control device 13 moves the pickup device 12 in the radial direction of the video disc 11 by the calculated number of tracks, and changes the reproduction position.

Thereafter, as in the conventional example, the synchronization signal generator 15 changes the cycle of the second synchronization signal by a predetermined length in accordance with a command from the synchronization device 19, thereby converting the second synchronization signal to the second synchronization signal. The phase is gradually adjusted to the first synchronization signal.

As described above, according to the present embodiment, the position where the first synchronization signal is recorded between adjacent tracks at the reproduction position of the video disk using the rotation detection device and the synchronization signal detection device. Detect the magnitude of the displacement, calculate the number of tracks to be moved from the magnitude of the displacement so that the phase of the first synchronization signal approaches the phase of the second synchronization signal, and give a command to the position control device. By providing the synchronization device, the synchronization can be shortened.

In the embodiment, the magnitude of the positional deviation in which the first synchronization signal is recorded between adjacent tracks is detected using the rotation angle detection device 17 and the synchronization signal detection device 14. It is also possible to detect from the timing relationship of the first synchronization signal before and after the movement.

Further, the time code recorded on the video disk 11 is read from the signal read by the pickup device 12, and the relationship between the time code and the radial position of the video disk 11, and the first position of the track adjacent to the radial position of the video disk 11. It can also be detected from the relationship of the magnitude of the displacement of the position where the synchronization signal is recorded.

As described above, the present invention provides a position control device that controls the radial position of a reproduction position of an information recording disk, and a synchronization signal detection device that detects a first synchronization signal included in the information recording disk. A device, a synchronization signal generating device that generates a second synchronization signal independent of the first synchronization signal,
At a reproduction position of the information recording disk, a position shift detecting device for detecting a size of a shift of a position where the first synchronization signal is recorded between adjacent tracks, and the position shift detecting device detects the position shift. And a synchronization device that calculates the number of tracks to be moved and gives a command to the position control device so that the phase of the first synchronization signal approaches the phase of the second synchronization signal from the magnitude of the positional deviation to be performed. By doing
Synchronization can be shortened.

[Brief description of the drawings]

FIG. 1 is a block diagram of a video disk reproducing apparatus according to a first embodiment of the present invention, FIG. 2 is an explanatory diagram showing the relationship between adjacent track recording positions of synchronization signals, and FIG. 1 is a block diagram of a video disc playback device. 11: Video disk with constant linear velocity, 12: Pick-up device, 13: Position control device, 14: Synchronous signal detecting device, 15: Synchronous signal generating device, 16: Color back generating device, 17 ... Rotation angle detection device, 18: Position deviation detection device, 19: Synchronization device, 31: Video disk with constant linear velocity, 32: Pickup device, 33: Position control device, 34: Synchronization signal detection device .., 35... A synchronization signal generator, 36... A color back generator, 39.

Claims (1)

(57) [Claims] An information recording disk having a constant linear velocity and containing at least a synchronizing signal, a position control device for controlling a radial position of a reproduction position of the information recording disk, and a first information recording disk included in the information recording disk A synchronizing signal detecting device for detecting the synchronizing signal, a synchronizing signal generating device for generating a second synchronizing signal independent of the first synchronizing signal, and a synchronizing signal generating device which is adjacent to the information recording disk at a reproducing position. A position shift detecting device for detecting a size of a shift of a position where the first synchronization signal is recorded between tracks, and giving a command to the position control device and the synchronization signal generation device; A signal and a synchronization device that adjusts the phase of the second synchronization signal, wherein the synchronization device is configured such that the first synchronization signal is based on the magnitude of the displacement detected by the displacement detection device. Second synchronizing signal such that the phase approaches,
The number of tracks to be moved is calculated, a command is given to the position control device, and at the same time as or after this operation, the synchronization signal is given to the synchronization signal generation device by the synchronization signal generation device. An information recording disk reproducing apparatus that performs an operation of gradually adjusting the phase of the second synchronization signal to the first synchronization signal by changing the cycle of the second synchronization signal by a predetermined length.