KR100194028B1 - How to play an optical disc - Google Patents

Abstract

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

How to play an optical disc

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

Running the optical disc at high speed reduces the error of incorrect data reading.

All. Summary of the Solution of the Invention

If the data cannot be read properly by driving the optical disk at high speed, adjust the driving speed of the optical disk at low speed and then drive the optical disk again to read the data.

la. Important uses of the invention

By stably driving the optical disc, the reliability of the operation of reproducing data from the optical disc is improved.

Description

How to play an optical disc

The present invention relates to a method for reproducing an optical disc, and more particularly, to a method for reproducing an optical disc when driving an optical disc at high speed.

Typically, optical discs include a compact disc having a large storage capacity for storing digital data, a digital video disc, and the like.

1 is a block diagram of a compact disc ROM drive to which the present invention is applied, and includes a compact disc 102, a spindle motor 104, an optical pickup 106, an RF signal amplifier 108, a digital signal processor 110, a decoder 112, a buffer memory 114, a controller 116, It consists of an interface unit 118 and a computer 120.

Referring to FIG. 1, the computer 120 applies a driving command signal to the control unit 116 through the interface unit 118 to drive the compact disk ROM drive. The controller 116 controls the overall operation of the compact disc ROM drive in response to a drive command signal of the compact disc ROM drive applied through the interface unit 118. When the compact disc 102 is rotated at a constant speed according to the drive of the spindle motor 104, the optical pickup 106 reads data recorded in the compact disc 102, converts the data into an electrical signal, and outputs the signal to the RF signal amplifier 108. The RF signal amplifier 108 receives the electrical signal output from the optical pickup 106, amplifies it, and outputs the amplified signal to the digital signal processor 110. The digital signal processor 110 receives a signal output from the RF signal amplifier 108 and performs a processing operation on the digital signal and outputs the signal to the decoder 112. The decoder 112 receives a signal output from the digital signal processor 110 and decodes the signal. In addition, the decoder 112 checks whether an error occurs in the data read from the compact disc 102 and corrects an error generated in the data when a correctable error occurs. The buffer memory 114 receives and decodes the signal decoded by the decoder 112. The interface unit 118 transfers the digital signal output from the decoder 112 to the computer 120.

FIG. 2 is a block diagram of a digital video disk ROM drive to which the present invention is applied, and further includes a digital video disk data processing unit 200 and a digital video disk ROM buffer management unit 202 as compared to FIG. The block structure of the same reference numeral as that shown in Fig. 1 is similar in its operation. The digital video disc data processor 200 processes data read from the digital video disc 102. The digital video disc ROM buffer manager 202 stores a signal output from the digital video disc data processor 200 in the buffer memory 114.

3 is a diagram showing a method of reproducing a conventional optical disc, which will be described with reference to the drawings.

In step 300, the control unit 116 rotates the disk 102 by controlling the spindle motor 104, and reads the data recorded on the disk 102 through the optical pickup 106. In step 302, the controller 116 checks whether an error occurs with respect to the data read from the disk 102, and determines whether the data has been read from the disk 102 properly. If the data is not properly read from the disk 102, in step 304, the controller 116 counts how many times data has been read from the disk 102 and determines whether the predetermined number of retries has been exceeded. If the number of times the disc 102 has been played does not exceed the predetermined number of retries, the control unit 116 repeats the process of reading data from the disc 102 again from step 300. On the contrary, if the number of retries is exceeded, the controller 116 recognizes that data cannot be read from the disk 102 and fails. On the contrary, in the case where data is properly read from the disc 102, the controller 116 controls the decoder 112 to correct a simple error generated in the read data, and transmits the data to the computer 120 through the interface unit 118. Perform.

As described above, when the optical disc is not reproduced properly to read data from the optical disc, the conventional method simply regenerates the optical disc under the same conditions and reads the data again. Therefore, the conventional method of simply and repeatedly playing an optical disc a predetermined number of times under the same condition has a problem in that data is not properly read even when the optical disc is played many times.

In addition, the speed of reading data from the optical disk increases as the speed of the compact disk drive or the digital video disk drive increases, but the reliability of the data is reproduced due to vibration or disturbance caused by the drive. There is a problem of this deterioration.

It is therefore an object of the present invention to provide an optical disc reproducing method for improving the reliability of reproducing data from an optical disc.

Another object of the present invention is to provide a method of reproducing an optical disc for reproducing data from the optical disc by adjusting a driving speed of the optical disc when an error occurs when the optical disc is reproduced.

The present invention for achieving the above object is characterized by reproducing the optical disk to read the data after adjusting the drive speed of the optical disk when the data is not properly read from the optical disk as the optical disk plays at high speed.

1 is a block diagram of a compact disc ROM drive to which the present invention is applied.

2 is a block diagram of a digital video disk ROM drive to which the present invention is applied.

3 is a control flowchart of a method of playing a conventional optical disc.

4 is a control flowchart of a method of playing an optical disc according to an embodiment of the present invention;

Hereinafter, with reference to the accompanying drawings according to a specific embodiment of the present invention will be described in detail.

4 is a diagram illustrating a process of reproducing an optical disc according to an embodiment of the present invention. When data is not read correctly when the optical disc is driven at a high speed, the optical disc is driven again to read the data by adjusting the driving speed of the optical disc. It is.

1 and 4, in step 400, the controller 116 controls the spindle motor 104 to rotate the disk 102 to read data recorded on the disk 102 through the optical pickup 106. In step 402, the controller 116 determines whether an error occurs in the data read from the disk 102 through the decoder 112, and determines whether the data is read correctly. In the case where the data is properly read from the disk 102, the controller 116 corrects an error that can be corrected in the data through the decoder 112, and performs a success process of transferring the data to the computer 120 through the interface unit 118. On the contrary, if data cannot be properly read from the disk 102, the controller 116 restarts the disk 102 to count the number of times data is read again in step 404, and determines whether the predetermined number of retries has been exceeded. If the number of retries is not exceeded, the controller 116 controls the spindle motor 104 to adjust the rotational speed of the disk 102 in step 406. The controller 116 rotates the disk 102 again to adjust the number of rotations of the spindle motor 104 to slow down the rotation speed of the disk 102. On the contrary, when the number of times that the disc 102 has been repeatedly played exceeds the predetermined number of retries, the controller 116 may fail to recognize that data cannot be read in step 408.

When the optical disc is rotated at a high speed in such a manner that data cannot be read correctly when the data is reproduced from the optical disc, the optical disc is regenerated and then the optical disc is replayed.

As described above, the present invention has an advantage of improving reliability of optical disc reproduction by adjusting the rotation speed of the optical disc and replaying it when data is not read correctly when the optical disc is reproduced at high speed.

Claims (3)

In the method of playing an optical disc, If the data recorded on the optical disk cannot be read properly by rotating the optical disk, after adjusting the rotational speed of the optical disk, the optical disk is rotated again to reproduce the data recorded on the optical disk. How to play an optical disc. The method of claim 1, And a rotation speed of the optical disc is controlled by controlling a double speed of the spindle motor. The method of claim 1, And reproducing the data recorded on the optical disc by rotating the optical disc again to adjust the rotational speed of the optical disc at a low speed.