JP3316856B2 - Reference synchronization signal generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reference synchronizing signal necessary for reproducing a signal on a video disk, and useful for performing special reproduction such as track search, track jump, and trick play. It is about.

[0002]

2. Description of the Related Art In recent years, there has been an increasing demand for higher performance for special playback functions on video discs.

[0003] A conventional reference synchronization signal generator will be described below. FIG. 5 shows a block diagram of a conventional reference synchronization signal generator. In FIG. 5, 1 is a reference signal generator, 2 is a reference synchronization signal generator, 3 is a reference synchronization signal output terminal, and 4 is a reset signal input terminal.

The operation of the reference synchronizing signal generator configured as described above will be described below. The reference signal obtained by the reference signal generator 1 is applied to the reference synchronization signal generator 2, divided by the reference signal generator 2 to become a reference synchronization signal, and output from the reference synchronization signal output terminal 3. Further, when a reset signal is input from the reset signal input terminal 4, a reference synchronization signal is generated again from that point.

In general, a video disk has a constant rotation speed (hereinafter abbreviated as CAV),
In order to increase the recording density, a disk is used which has a constant linear velocity during recording and reproduction (hereinafter abbreviated as CLV). Thus, the spindle servo for rotating the CAV and CLV disks is configured to generate a drive signal using the reproduction synchronization signal and the reference synchronization signal.

[0006] In particular, in the CL V disc playback, if you move to another playback location to jump the playback location when and was judged to be able to follow in another playback track, the reset signal input terminal 4
And a new reference synchronization signal is generated. Normally, when a reset signal is input, the first pulse of the reference synchronization signal passes through a time corresponding to a half cycle of the reference synchronization signal. , And thereafter, pulses are sequentially generated in the cycle of the reference synchronization signal.

[0007]

However, in the above-mentioned conventional configuration, the relationship between the reproduction synchronization signal immediately after jumping (immediately after reset) and the reference synchronization signal in the CLV disk is not uniquely determined. There has been a problem that a change in the drive signal of the spindle servo, which occurs due to the accuracy of the disk or mechanism, exceeds the dynamic range of the drive signal, and the time required to shift to a stable state increases.

The present invention solves the above-mentioned conventional problem. By restarting the reference synchronization signal using the reproduction synchronization signal input immediately after the jump, the relationship between the reproduction synchronization signal and the reference synchronization signal is uniquely determined. To provide a reference synchronization signal generator capable of realizing a high-performance special reproduction function because the dynamic range of the spindle servo drive signal can be effectively used and the transition time to the stable state can be shortened. With the goal.

[0009]

To achieve this object, a reference synchronization signal generating apparatus according to the present invention includes a reference signal generation section for generating a reference signal, and a reference synchronization signal for generating a reference synchronization signal using the reference signal. A signal generator, a window control signal generator for generating a window control signal for controlling the window section, and a start signal generated from a reproduction synchronization signal obtained in a window section of the reproduction synchronization signal reproduced from the recording medium by the window control signal. and a start signal generating unit, vinegar
The start signal output by the start signal generator is reset
Addition that adds the reset signal input from the signal input terminal
Enter the initial value setting unit that determines the starting point of the reference synchronizing signal generator and the reference synchronization signal through the section, a track jump movement
Operation is completed or after a reset signal is input.
A window control signal is generated from the India control signal generator.
In the window section controlled by the window control signal
Start signal is generated in synchronization with the first playback synchronization signal
The generator generates a start signal, and the reference synchronization signal is generated by the reference synchronization signal generator from a start point shifted from a generation point of the start signal output by the start signal generator by a specified initial value output by the initial value setting unit. It has a configuration to start generation. Further, the reference synchronizing signal generating device of the present invention
Reference signal generator that generates a signal and reference using a reference signal
A reference synchronizing signal generator for generating a synchronizing signal;
Control to generate window control signals
A signal generator and a window control signal
Playback synchronization obtained in the window section of the generated playback synchronization signal
A start signal generator for generating a start signal from the signal;
The signal output from the start signal generator is based on
It is input to the sync signal generator and the reference sync signal is opened.
The start signal is also input to the initial value setting section that determines the start point.
Set the initial value from the point of generation of the start signal output by the generator.
Reference synchronization from the starting point shifted by the initial value output by the fixed part
Start the generation of the reference synchronization signal in the signal generator, and
It has a configuration for resetting the specified initial value.

[0010]

According to this configuration, the reference synchronization signal can be restarted at intervals corresponding to the values set to the initial values by using the reproduction synchronization signal reproduced immediately after the jump operation (being able to follow the track). Therefore, the relationship between the reproduction synchronization signal and the reference synchronization signal at the time of the restart can be uniquely determined.

[0011]

(Embodiment 1) Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

FIG . 1 shows a reference on which the embodiment of the present invention is based.
It is an example of a synchronization signal generator. In FIG. 1, 11 is a reproduction synchronization signal input terminal, 12 is a start signal generator, 1
3 is an initial value setting unit, 14 is a window control signal generation unit, 1
Denotes a reference signal generation unit, 2 denotes a reference synchronization signal generation unit, and 3 denotes a reference synchronization signal output terminal.

The operation of the reference synchronizing signal generator configured as described above will be described with reference to FIG. First, the reference synchronization signal generation unit 2 can divide the reference signal output from the reference signal generation unit 1 by a predetermined division ratio to obtain a reference synchronization signal, and start from the start signal generation unit 12. When a signal is input, a reference synchronization signal is generated at a phase different from the previous phase based on the start signal.

FIG. 2 shows the operation of the reference synchronizing signal generator in the jump operation. During the jump operation, since the signal cannot be correctly reproduced from the recording medium, an indefinite section in which a correct reproduction synchronization signal cannot be obtained. However, the reference synchronization signal keeps the state before the jump operation and continuously generates the reference synchronization signal even during the jump. When the target track can be reproduced by the jump operation (jump operation ends), a signal is applied from the window control signal generator 14 to the start signal generator 12. At this time, the start signal generator 12 generates a start signal in response to the reproduction synchronization signal input from the reproduction synchronization signal input terminal 11, applies the start signal to the reference synchronization signal generator 2 and the initial value setting unit 13, and The start signal generator 12 no longer responds to the reproduction synchronization signal from the reproduction synchronization signal input terminal 11. When a start signal is input from the start signal generation unit 12 to the initial value setting unit 13, an initial value for setting a first time at which the reference synchronization signal restarts is transferred to the reference synchronization signal generation unit 2. Upon receiving the start signal from the start signal generating unit 12, the reference synchronizing signal generating unit 2 stops the reference synchronizing signal which has been generated so far, and is again transferred from the initial value setting unit 13 based on the start signal. After a time corresponding to the initial value, the first reference signal is generated, and thereafter, the reference signal is continuously generated, and the reference signal is generated from the reference synchronization signal output terminal 3.
Therefore, the initial value of the phase difference between the reproduction synchronization signal and the reference synchronization signal after the end of the jump operation is a phase difference corresponding to the initial value set by the initial value setting unit 13. For example, in the case of a CLV disc, if the rotational speed required for reproduction differs before and after a jump, the phase difference between the reproduction synchronization signal and the reference synchronization signal changes according to the characteristics of the spindle servo.

As described above , according to the example shown in FIG. 1, based on the reproduction synchronization signal obtained after the end of the jump operation (the state in which the target track can be followed), the reference synchronization signal is set in the initial value. By configuring so as to cause re-generation, for example, in a state where the number of rotations differs before and after a jump, such as a CLV disk, the phase difference between the reproduction synchronization signal and the reference synchronization signal starts from a fixed value immediately after the jump. , The dynamic range of the phase difference can be effectively used, the spindle servo can be pulled in in a short time, and the performance can be improved.

[0016] will be described with reference to the drawings a first embodiment of the following Shitahon invention. FIG. 3 is a block diagram of a reference synchronizing signal generator according to a first embodiment of the present invention. 3, reference numeral 11 denotes a reproduction synchronization signal input terminal, 12 denotes a start signal generation unit, 13 denotes an initial value setting unit, 14 denotes a window control signal generation unit, 1 denotes a reference signal generation unit, 2 denotes a reference synchronization signal generation unit, and 3 denotes a reference synchronization signal generation unit. Is a reference synchronizing signal output terminal, the above is the same as the configuration of FIG. 1, and 21 is a reset signal input terminal, 2
2 is a signal addition unit. 1 is different from the configuration of FIG. 1 in that a signal addition unit 22 is provided, a start signal generated by a start signal generation unit 12 is added to a reset signal input from a reset signal input terminal 21, and the obtained signal is initialized. By applying the signal to the value setting unit 13 and the reference synchronization signal generation unit 2, the reference synchronization signal can be set not only with the reproduction synchronization signal but also with the reset signal.

As described above, by providing the reset signal input terminal 21 and the signal adder 22 so that the reference synchronizing signal can be generated by either the reset signal input or the start signal, the reproduction synchronizing signal at power-on or the like is provided. Even in a state in which the reference synchronization signal does not occur, the reference synchronization signal can be appropriately generated by applying the reset signal.

[0018] (Example 2) will be described with reference to the drawings a second embodiment of the following invention. FIG. 4 is a block diagram of a reference synchronizing signal generator according to a second embodiment of the present invention. In FIG. 4, 11
Is a reproduction synchronization signal input terminal, 12 is a start signal generator,
13 is an initial value setting unit, 14 is a window control signal generation unit,
Reference numeral 1 denotes a reference signal generator, reference numeral 2 denotes a reference synchronization signal generator, reference numeral 3 denotes a reference synchronization signal output terminal, which has the same configuration as that shown in FIG. 1, and reference numeral 23 denotes an initial value controller. The difference from the configuration of FIG. 1 is that the initial value control unit 23 is provided, and the set value of the initial value setting unit 13 can be appropriately reset.

As described above, by providing the initial value control unit 23, the initial value can be reset during reproduction, and the relationship between the reproduction synchronization signal and the reference synchronization signal can be appropriately set after jumping, so that optimum setting is possible. Becomes

[0020]

The present invention as described above, according to the present invention, using a reproduction synchronizing signal without re <br/> ready to follow the track just after jump operation or power-on or the like, the initial value of the reference synchronizing signal Since restart can be performed at intervals corresponding to the set value, the restart time or power-on etc.
A device that can uniquely determine the relationship between the playback synchronization signal and the reference synchronization signal when the rack can follow the rack, and realizes a reference synchronization signal generator that has excellent characteristics in the transition time to the stable state. It is. Also, after jumping or
After the power is turned on, the relationship between the playback synchronization signal and the reference synchronization signal
There is also an effect that the setting can be made and the optimum setting can be made.

[Brief description of the drawings]

FIG. 1 is a block diagram of a reference synchronization signal generating device according to an example which is a premise of an embodiment of the present invention;

[2] Operation diagram for explaining the operation of the reference synchronizing signal generator in the same example

FIG. 3 is a block diagram of a reference synchronization signal generator according to the first embodiment of the present invention.

FIG. 4 is a block diagram of a reference synchronization signal generator according to a second embodiment of the present invention.

FIG. 5 is a block diagram of a conventional reference synchronization signal generator.

[Explanation of symbols]

 11 Reproduction synchronization signal input terminal 12 Start signal generator 13 Initial value setting unit 14 Window control signal generator

Claims (3)

(57) [Claims] A reference signal generator for generating a reference signal;
A reference synchronization signal generator for generating a reference synchronization signal using the reference signal; a window control signal generator for generating a window control signal for controlling a window section; and a reproduction synchronization signal reproduced from a recording medium by the window control signal. A start signal generation unit that generates a start signal from a reproduction synchronization signal obtained in a window section of the start signal, wherein the start signal output by the start signal generation unit is a reset signal input from a reset signal input terminal.
Via an addition unit for adding input to the initial value setting unit that determines the starting point of the reference synchronizing signal generator and said reference synchronizing signals, a track jump operation is completed or after the reset signal
Signal input unit in any case after signal input
Generates a window control signal from the
First in a window section controlled by
The start signal generator is started in synchronization with the reproduction synchronization signal.
A reference signal is generated by the reference synchronization signal generation unit from a start point shifted from a generation point of the start signal output by the start signal generation unit by a specified initial value output by the initial value setting unit. A reference synchronizing signal generator for starting signal generation. 2. An initial value setting unit resets an initial value.
2. The reference synchronizing signal generator according to claim 1, wherein: 3. A reference signal generator for generating a reference signal;
Reference synchronization using the reference signal to generate a reference synchronization signal
A signal generator and a window control signal for controlling a window section.
A window control signal generator for generating a signal;
(C) the reproduction synchronization signal reproduced from the recording medium by the control signal.
Start signal from playback synchronization signal obtained in India section
A start signal generating unit for generating the signal, wherein a signal output from the start signal generating unit is
The reference synchronization signal is input to a synchronization signal generation unit.
Is also input to the initial value setting section that determines the start point of
Than the point at which the start signal output by the
Starting point shifted by the initial value output by the initial value setting unit
Starts the generation of the reference synchronization signal in the reference synchronization signal generation section.
It is started, based on you characterized by resetting the initial value defining the starting point the quasi-synchronized signal generator.