KR100282940B1 - Optimal ALPM Setting Method by CD-ROM Speed - Google Patents

Abstract

end. The technical field to which the invention described in the claims belongs:

An optical disc player.

I. The technical problem the invention is trying to solve:

It can increase the responsiveness to disk eccentricity, deflection and scratch, and also set the RPM for each speed to increase the responsiveness to the environment of the drive set.

All. The gist of the solution of the invention:

According to the method of the present invention for setting an optimal RPM (RPM) for each CD-ROM drive, the number of FG (Frequency Generation) signals generated according to the rotation of the spindle motor is counted to check the value of the RPM, and the checked RPM is checked. Set the CD-ROM drive double speed that is close to the RPM value, and then change the reference RPM value of the set double speed little by little, while the value of the signal indicating the data error correction performance or the signal indicating the sub-code check performance The state having the best value is checked, and the RPM value checked in the best state is set as the optimum value of the corresponding double speed.

la. Important use of the invention: optical disc player such as CD-ROM, DVD-ROM

Description

How to set the optimal ALPM for each CD-ROM speed

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc reproducing apparatus, and more particularly, to a method for setting an optimal revolution per minute (RPM) according to a CD-ROM (Compact Disc-Read Only Memory) speed.

CD-ROM drives, which are used as an auxiliary recording device for computers, have been applied in various fields as data, software preservation, distribution, games, and sales agencies with the development of multimedia. CD-ROM drives are getting faster at 6x, 8x, 16x, and 32x speeds, even though the access time is much slower than that of hard disks. In addition, it is in the spotlight as a write once read many (WORM) medium.

The CD-ROM drive is equipped with a spindle motor that rotates the optical disk at a fixed speed or a regular speed. When the spindle motor rotates, for example, six FG (Frequency Generation) signals are output per revolution by the hole elements provided in the spindle motor. A micro-computer as a system control unit receives the FG signal as an FG pulse by using an internal analog to digital converter (ADC). As shown in FIG. 2, when the FG pulse is input in step 100, the number of input FG signals is counted in step 102, and then the current RPM value is checked in step 104. Next, set the CD-ROM speed to approach the RPM value checked in step 106.

In general, since the RPM value is already determined for each speed, the checked RPM value does not exactly match the RPM value already determined at the speed. This depends on the condition of the disk (eccentricity, deflection, scratch, etc.) or the environment of the drive set, and the worse the condition or environment, the larger the checked RPM value is. Therefore, it is required to set the RPM per speed considering the state or environment.

Accordingly, an object of the present invention is to provide a method for setting the optimum RPM for each CD-ROM speed.

The present invention for achieving the above object, in the method for setting the optimum RPM (RPM) for each CD-ROM drive speed, the number of FG (Frequency Generation) signal generated by the rotation of the spindle motor to count the RPM (RPM) Check the value and set the CD-ROM drive double speed that is close to the checked RPM value, and slightly change the reference RPM value of the set double speed while showing the best value of the signal indicating the data error correction performance. And a step of setting the RMP value checked in the state where the value of the signal indicating the data error correction performance is the best, to an optimum value of the corresponding double speed.

In another aspect, the present invention, in the method for setting the optimum RPM for each CD-ROM drive speed, the number of FG (Frequency Generation) signal generated by the rotation of the spindle motor is counted to check the value of the RPM (RPM) and check the checked ALPM Setting a CD-ROM drive double speed that is close to the RPM value, checking a state in which a value of a signal indicating a sub code check performance is best while slightly changing the reference RPM value of the set double speed, and Characterized in that the value of the signal indicating the check performance is characterized in that it consists of the process of setting the ALMP value to be checked to the optimum value of the corresponding double speed.

1 is a block diagram of a typical CD-ROM drive,

2 is a flow chart for setting ALPM for CD-ROM speed according to the prior art;

Figure 3 is a flow chart for setting the CD-ROM CD speed according to an embodiment of the present invention.

Hereinafter, an operation according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following description and drawings many specific details are set forth, such as CD-ROM drive specific configurations and functions, and therefore signals, to provide a more general understanding of the invention. It will be apparent to those skilled in the art that the present invention may be practiced without these specific details. And a detailed description of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

1 is a diagram illustrating a typical configuration of a CD-ROM drive for better understanding of an embodiment of the present invention. Referring to FIG. 1, the optical pickup 12 outputs an RF (Radio Frequnecy) signal obtained by optically picking up information recorded on a track of 10 optical disks and converting the information into an electrical signal to the RF signal processor 20. The spindle motor 14 driving the optical disk 10 rotates at a fixed speed or a constant speed by the spindle motor driver 26, and the optical pickup 12 is driven by an actuator driver 24 for tracking servo and focus servo. . The transfer motor 16 for transporting the pickup 12 is driven by the transfer motor driver 28. The tray motor 18 for moving the tray is driven by the tray motor driver 30 controlled by the microcomputer 38.

The RF signal processor 20 amplifies and waveforms an RF signal output from the optical pickup 12 and applies data to the digital signal processor 32. In addition, servo errors such as focus errors and tracking errors are detected and amplified in the RF signal and output to the digital servo unit 22. The digital signal processor 32 includes an EFM (Eight to Forteen Modulation) demodulator, a PLL (Phase Locked Loop) unit, a CLV (Constant Linear Velocity) control unit, an error correction and timing control unit, a data processor, etc. It carries out various processes accordingly. The host interface 44 controls the interface between the digital signal processor 32 and the host and the host and the microcomputer 38. The audio signal processed by the digital signal processor 32 is output to the user through a digital to analog converter (DAC) 34, a low pass filter (LPF), and an amplifier 36. Microcomputer 38 controls the CD-ROM driver as a whole and has ROM 40 and RAM 42. The event key 40 and the operation indicator lamp 50 are connected to the microcomputer 38.

The digital servo unit 22 digitally processes the servo error signals such as the focus error signal and the tracking error signal output from the RF signal processor 20 and the CLV or CAV servo error signal from the digital signal processor 32 to compensate for various servo errors. Controls driver 24, spindle motor driver 26 and feed motor driver 28.

3 is a flowchart for setting an ALMP for each CD-ROM speed according to an embodiment of the present invention.

Hereinafter, referring to FIGS. 1 and 3, an operation of setting an ALPM for each CD-ROM speed according to an exemplary embodiment of the present invention will be described in detail.

In order to set the RPM, the Hall elements provided in the spindle motor 14 of FIG. 1 output, for example, six frequency generation (FG) signals per revolution of the spindle motor 14. The micro-computer 38, which is a system control unit, receives the FG signal as an FG pulse using a built-in analog to digital converter (ADC). As shown in FIG. 3, when the FG pulse is input in step 200, the number of input FG signals is counted in step 202, and then the current RPM value is checked in step 204. Next, the CD-ROM speed setting close to the RPM value checked in step 206 is set.

Thereafter, the microcomputer 38 checks the C2PO signal and the SBOK signal provided from the digital signal processor 32 in step 208. The C2PO signal is a signal indicating data error correction performance, and the SBOK signal is a signal indicating check performance for a sub code carrying various control signals and additional information. The output terminal of the C2PO signal and the SBOK signal is provided in the output terminal of the digital signal processor 32 of a conventional CD-ROM drive.

The microcomputer 38 checks when the value of the C2P0 signal or the SBOK signal checked in step 208 is the best state while slightly changing the reference RPM value of the already set double speed in step 210. Set the RPM value at the optimum speed for the relevant double speed. As a specific example, the 32-speed CD-ROM drive has a reference RPM of about 6000, and the RPM checked by the hall element of the spindle motor 14 is about 5800 to 6100. Therefore, if the RPM in the state of the best value of the C2PO signal and the SBOK signal among these RPM is 6100, the current RPM of 32x is set to 6100.

As described above, according to the present invention, as the optimal RPM is set for each CD-ROM speed, the disc drive can cope with eccentricity, deflection, and scratch, and can also increase the coping force with respect to the environment of the drive set.

Claims (2)

In the method for setting the optimal RPM (RPM) for each CD-ROM drive speed, Counting the number of FG (Frequency Generation) signals generated by the rotation of the spindle motor to check the RPM value and to set the CD-ROM drive double speed close to the checked RPM value; Checking a state in which a value of a signal representing data error correction performance is the best while slightly changing the reference RPM value of the set double speed; And setting an RMP value checked in the state where the value of the signal indicating the data error correction performance is the best to the optimum value of the corresponding double speed. In the method for setting the optimum RPM for each CD-ROM drive speed, Counting the number of FG (Frequency Generation) signals generated by the rotation of the spindle motor to check the RPM value and to set the CD-ROM drive double speed close to the checked RPM value; Checking a state in which the value of the signal indicating the sub code check performance is the best while slightly changing the reference RPM value of the set double speed; And setting an RMP value checked in a state in which the signal indicating the subcode check performance is the best, to an optimum value of the corresponding double speed.

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