JP2003173546A - Disk player - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disk player whose starting time is reducible. <P>SOLUTION: When the disk player is started, an adjusted value at the previous time is read out from a memory 32 by a system controller 30, and this adjusted value is set in a servo LSI 20 as an initial value at the servo adjustment. By the servo LSI 20, servo adjustments (the adjustments of the phase compensating amount and a gain with respect to a focus error signal, a tracking error signal, etc.), are executed. When the servo adjustments are finished, the adjusted values set by the servo LSI 20 are obtained and stored in the memory 32 by the system controller 30. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc reproducing apparatus for reading signals recorded on various disc type recording media to reproduce recorded information.

[0002]

2. Description of the Related Art A disc type recording medium such as a CD (compact disc) or a DVD (digital versatile disc) (hereinafter, simply referred to as a "disc") for recording music, movies, or other various data.
Is widely used. On a disc such as a CD, data is recorded spirally or concentrically with small pits on the signal recording surface. A disc reproducing device for reproducing a CD or the like focuses a laser beam emitted from an optical pickup on the signal recording surface. The pit train (track) is traced in line with the above, and the recording signal is read by detecting the reflected beam at this time with an optical pickup.

In addition, recent disk reproducing apparatuses automatically perform various adjustments such as tracking balance adjustment and focus balance adjustment at the start of reproducing operation such as power-on or disk loading due to digitization of servo LSI. Things are common. In this way, the characteristics of various components (for example, optical pickups) are changed with time by performing automatic adjustment such as tracking balance adjustment each time the disc reproducing device is started or a new disc is loaded. Changes in the surrounding environment such as temperature and temperature,
Alternatively, since it is possible to set an appropriate adjustment value corresponding to the individual difference of each disc, a stable reproducing operation can be realized.

[0004]

By the way, in the above-mentioned conventional disc reproducing apparatus, the automatic adjustment is performed every time the reproduction is started. By this automatic adjustment, the optimum adjustment for realizing a good reproducing operation is made. It takes some time for the value to be obtained. Therefore, in the conventional disc reproducing apparatus, there is a problem that the time required until the reproduction of the recorded information (for example, the sound or the like) is started based on the signal recorded on the disc, that is, the starting time becomes long.

As a conventional technique for solving such a problem,
The fixed adjustment value or the previous adjustment value is stored in the memory, this adjustment value is read from the memory at the time of startup, set in the servo LSI, and reproduction is started, thereby omitting automatic adjustment and starting time. There are known methods for reducing However, the optimum adjustment value changes with time, environmental changes such as temperature, or when the disc to be played is replaced, so the fixed value or the previous adjustment value is the optimum value. Often not. In this case, after the reproduction operation is once attempted, the automatic adjustment is performed again, which undesirably increases the startup time.

The present invention was created in view of the above points, and an object of the present invention is to provide a disc reproducing apparatus capable of shortening the startup time.

[0007]

In order to solve the above-mentioned problems, a disk reproducing apparatus of the present invention includes a reproducing mechanism for reproducing recorded information based on a signal read from a disk type recording medium, and this reproducing mechanism. The adjustment mechanism that automatically adjusts various parameters required for the playback operation when the playback operation starts, and the previous adjustment value obtained by the automatic adjustment by the adjustment mechanism when the playback operation starts Adjustment initial value setting means for setting the value is provided. When performing automatic adjustment by the adjustment mechanism (for example, adjustment related to the servo system), the previous adjustment value is set as the initial value, so the adjustment values of various parameters necessary for playback operation converge to the optimum values. The time required can be shortened, and the start-up time can be shortened.

Further, a memory for storing the adjustment value obtained by the automatic adjustment by the adjusting mechanism is further provided, and the adjustment initial value setting means, when the automatic adjustment performed by the adjusting mechanism is completed, is set at that time. It is desirable to store the adjustment value in the memory, read the adjustment value stored in the memory prior to the next reproduction operation, and set it as the initial value of the automatic adjustment of the adjustment mechanism. Since the adjustment value at the time of completion of the automatic adjustment is stored in the memory, the previous adjustment value can be reliably set as the initial value in the next automatic adjustment. Especially, since the adjustment value of the automatic adjustment performed at the start of the playback operation is stored in the memory,
After the reproduction operation is started once, it is not necessary to update the adjustment value stored in the memory, and the processing can be simplified.

Further, it is desirable that the automatic adjustment operation by the adjustment mechanism and the initial value setting operation by the adjustment initial value setting means are performed when the power is turned on. For example, when the disk-type recording medium to be played back is not inserted or removed, the optimum adjustment value does not change significantly compared to the previous playback operation, so the previous adjustment value is set to the initial value. By setting the value and executing the automatic adjustment, the time required for the automatic adjustment can be significantly shortened and the startup time can be shortened.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION A disk reproducing apparatus according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a configuration of a disc reproducing apparatus according to an embodiment. The disc reproducing apparatus shown in FIG. 1 reproduces recorded information based on a signal read from the disc 10, and includes a spindle motor 12, a sled motor 14, an optical pickup 16, an RF amplifier 18, a servo LSI 20, and a servo driver 22. , A digital signal processing unit 24, a system controller 30, and a memory 32.

The spindle motor 12 rotates the disk 10 at a predetermined speed. The thread motor 14 moves the optical pickup 16 in the radial direction of the disc 10. The optical pickup 16 reads a signal recorded on the disk 10, and includes a semiconductor laser, a photodiode, and a focus lens. Further, the optical pickup 16 includes a focus actuator for moving the focus lens in a direction substantially perpendicular to the recording surface of the disc 10 and a focus lens for the disc 1.
A tracking actuator for moving in the radial direction of 0 is also included.

The RF amplifier 18 amplifies the signal output from the optical pickup 16 and performs a predetermined equalizer process to generate an RF signal, and the digital signal processing unit 2
Output to 4. The RF amplifier 18 also has a focus error signal (FE) required for focus servo and a tracking error signal (TE) required for tracking servo.
Is generated and output to the servo LSI 20.

The servo LSI 20 performs various servo controls. Specifically, the servo LSI 20 is the RF amplifier 1
The focus error signal output from 8 is subjected to phase compensation and amplification, and a focus actuator control signal necessary for controlling the drive state of the focus actuator in the optical pickup 16 is generated.

Further, the servo LSI 20 includes the RF amplifier 1
8 performs phase compensation and amplification on the tracking error signal output from the signal generator 8 to generate a tracking actuator control signal necessary for controlling the driving state of the tracking actuator in the optical pickup 16, The sled motor control signal necessary for controlling the driving state of the sled motor 14 is generated based on the component (mainly the DC component).

Further, the servo LSI 20 includes the RF amplifier 1
A spindle motor control signal required for controlling the drive state of the spindle motor 12 is generated based on the control signal output from the control unit 8. These signals generated by the servo LSI 20 are output to the servo driver 22.

Further, the servo LSI 20 is designed so that a predetermined servo characteristic can be obtained when the disc reproducing apparatus is started.
A process of automatically adjusting adjustment values (various parameters necessary for reproducing operation) such as the amount of phase compensation and the gain of amplification for the focus error signal and the tracking error signal is performed. Hereinafter, this adjustment will be referred to as “servo adjustment”.

The servo driver 22 is the servo LSI 20.
A drive voltage for the focus actuator of the optical pickup 16 is generated based on the focus actuator control signal output from the optical pickup 16. In addition, the servo driver 22
Generates a drive voltage for the tracking actuator of the optical pickup 16 based on the tracking actuator control signal output from the servo LSI 20.

Further, the servo driver 22 is a servo LS.
The drive voltage of the sled motor 14 is generated based on the sled motor control signal output from I20. Further, the servo driver 22 generates a drive voltage for the spindle motor 12 based on the spindle motor control signal output from the servo LSI 20.

The digital signal processing section 24 includes the RF amplifier 1
The RF signal output from 8 is subjected to synchronization detection and demodulation processing, and then subjected to predetermined decoding processing to reproduce a recording signal (for example, video and audio). The system controller 30 controls the overall operation of the disk reproducing device, such as outputting various servo commands to the servo LSI 20. The system controller 30 also executes the servo adjustment at the servo LS when the disc reproducing apparatus is started.
When the I20 is instructed and the servo adjustment by the servo LSI 20 is completed, the adjustment values (gain, phase compensation amount, etc.) set by the servo adjustment are acquired from the servo LSI 20 and stored in the memory 32. When instructing the servo LSI 20 to perform servo adjustment at startup, the system controller 30 of the present embodiment reads the previous adjustment value stored in the memory 32 and sets this adjustment value as an initial value in the servo LSI 20. There is.

The memory 32 stores the adjustment value obtained by the servo adjustment by the servo LSI 20 and output from the system controller 30. As described above, since the adjustment value at the time when the automatic adjustment is completed is stored in the memory 32, the previous adjustment value can be reliably set as the initial value in the next automatic adjustment.

The entire disc reproducing apparatus described above corresponds to the reproducing mechanism, the servo LSI 20 corresponds to the adjusting mechanism, and the system controller 30 corresponds to the adjusting initial value setting means. The disc reproducing apparatus of the present embodiment has such a configuration, and the operation content will be described next.

FIG. 2 is a flow chart showing the operation procedure of the disc reproducing apparatus when the servo adjustment is performed when the power is turned on. The system controller 30 determines whether the power is turned on (step 100). While the power is not turned on, a negative determination is made and the determination processing of step 100 is repeated.

When the power is turned on, an affirmative judgment is made in step 100, and the system controller 30 judges whether or not the disk 10 to be reproduced is loaded (step 101). If the disc 10 is not loaded, a negative determination is made, and the determination processing of step 101 is repeated.

If a new disc 10 is loaded by the user, or if the disc 10 is already loaded, an affirmative decision is made in step 101, and the system controller 30 stores the previous adjustment value in the memory 32. Is read (step 102), and the read adjustment value is set in the servo LSI 20 as an initial value for servo adjustment (step 103).

When an initial value is set by the system controller 30, the servo LSI 20 executes servo adjustment based on the set initial value (step 10).
4). Next, the system controller 30 sets the servo LS
It is determined whether or not the servo adjustment by I20 is completed (step 105). While servo adjustment is being performed by the servo LSI 20, a negative determination is made, and step 1
The determination of 05 is repeated.

When the servo adjustment by the servo LSI 20 is completed, an affirmative decision is made in step 105, and the system controller 30 acquires the adjustment value set by the servo LSI 20 and stores it in the memory 32 (step 1
06). As described above, the disk reproducing apparatus of the present embodiment sets the previous adjustment value as the initial value when performing the servo adjustment when the power is turned on, so that the adjustment values of various parameters necessary for the reproduction operation are the optimum values. It is possible to shorten the time required to converge to, thereby shortening the startup time. Especially when the disk type recording medium to be played back has not been changed before and after the power is turned on, the optimum adjustment value does not change much compared to the previous operation, so the previous adjustment value By setting to the initial value, the time required for automatic adjustment can be significantly reduced, and the startup time at power-on can be shortened.

The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the gist of the present invention. For example, in the embodiment described above,
Servo adjustments such as tracking balance adjustment and focus balance adjustment have been described as an example of automatic adjustment, but the contents of automatic adjustment are not limited to this, and are also necessary for playback operations. Various adjustments can be considered, such as adjustments related to a PLL circuit that generates a different clock.

In the above-described embodiment, when the power of the disc reproducing apparatus is turned on, the servo adjustment is automatically performed by the series of procedures shown in FIG. 2 to obtain the optimum adjustment value. The same process may be performed when the disk 10 is changed. In this case, after loading a new disc 10, step 10 shown in FIG.
It suffices to perform the processes 1 and later. As a result, it becomes possible to set an initial value for automatic adjustment corresponding to the secular change in the characteristics of the optical pickup 16 and the like, and it is possible to shorten the time required for adjustment as compared with the case where automatic adjustment is performed from a fixed initial value.

The disc reproducing apparatus of the present embodiment described above is used as a part of an audio system to reproduce music and images, and is also connected to a personal computer, a navigation device, etc. to reproduce various data. It can be used for reproduction.

As the disk 10 in the above-described embodiment, various disk type recording media such as CD, DVD, MD (mini disk) can be considered. Further, the present invention can be applied to a disc reproducing apparatus capable of selectively loading both a CD and a DVD. In this case, the adjustment value and DV corresponding to the CD
The adjustment value corresponding to D may be acquired separately and stored in the memory 32.

[0031]

As described above, according to the present invention, since the previous adjustment value is set as the initial value when the automatic adjustment is performed by the adjustment mechanism, the adjustment values of various parameters necessary for the reproducing operation are set. It is possible to shorten the time required to converge to the optimum value, and thereby shorten the startup time.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a disc reproducing apparatus according to an embodiment.

FIG. 2 is a flowchart showing an operation procedure of the disk reproducing device when performing servo adjustment at the time of startup.

[Explanation of symbols]

10 discs 12 Spindle motor 14 thread motor 16 Optical pickup 18 RF amplifier 20 Servo LSI 22 Servo driver 24 Digital signal processor 30 system controller 32 memory

Claims (3)

[Claims] 1. A reproducing mechanism for reproducing recorded information based on a signal read from a disc type recording medium, and an adjusting mechanism for automatically adjusting various parameters necessary for the reproducing operation when the reproducing operation is started by the reproducing mechanism. And an adjustment initial value setting means for setting the previous adjustment value obtained by the automatic adjustment by the adjustment mechanism as the initial value of the automatic adjustment at the start of the reproduction operation by the reproduction mechanism. Disc player. 2. The memory according to claim 1, further comprising a memory that stores an adjustment value obtained by the automatic adjustment by the adjustment mechanism, wherein the adjustment initial value setting means is configured to complete when the automatic adjustment performed by the adjustment mechanism is completed. In addition, the adjustment value at that time is stored in the memory, the adjustment value stored in the memory is read prior to the next reproduction operation, and is set as an initial value of automatic adjustment of the adjustment mechanism. Disc playback device. 3. The disc reproducing apparatus according to claim 1, wherein the automatic adjusting operation by the adjusting mechanism and the initial value setting operation by the adjusting initial value setting means are performed when the power is turned on.