KR20040096333A - method for recycling optical recode - Google Patents

Abstract

PURPOSE: An optical recording/reproducing method is provided to re-read data without reproducing the data if the data read from an optical recording medium has an error, and to reproduce the re-read data, thereby improving reproduction performance. CONSTITUTION: A device reads channel data from a CD(S301). The device designates a position by using subcode data of the read channel data, and perceives a kind of the data(S302), then buffers the channel data(S303). The device collects the subcode data to verify an error(S304), and decides whether the buffered channel data is smaller than a buffer empty margin(S305). If not, the device monitors an error generation situation of the collected subcode data(S306). The device decides whether an error is generated(S307). If not, the device transmits the channel data to a back end chip to decode main channel data(S309), and reproduces the decoded main channel data(S310).

Description

Optical record reproduction method {method for recycling optical recode}

The present invention relates to an optical recording reproduction method, and more particularly, to an optical recording reproduction method suitable for improving optical recording reproduction performance.

Channel data read from an optical recording medium such as a CD / DVD is divided into subcode data and main channel data and processed.

The subcode data is data for designating a position or storing information regarding the type of data, etc. The main channel data is data to be actually reproduced.

FIG. 1 is a block diagram of a general optical recording and reproducing apparatus, and is composed of a frontend chip 11 and a backend chip 12. As shown in FIG.

The back-end chip 12 is a part that processes data for play, and the back-end chip 12 typically has an MPEG decoder.

The back-end chip 12 passes the sector ID while requesting the data required by the front-end chip 11 for play.

The front-end chip 11 finds a sector ID received from the back-end chip 12 among the sub-code data of the channel data read from the CD, and corresponds to the corresponding channel. The data is stored in an internal buffer memory 11a.

Thereafter, the front-end chip 11 transmits the channel data stored in the buffer memory 11a to the back-end chip 12. In the back-end chip 12, the main data of the channel data received from the front-end chip 11 is transmitted. Decodes and reproduces channel data.

Fig. 2 is a flow chart showing the operation of the optical recording and reproducing apparatus according to the prior art, in which the optical recording and reproducing apparatus is first front-end in order to reproduce data recorded on an optical recording medium loaded on it, for example, CD. The chip 11 reads channel data from the CD (S201).

After the position is specified using the subcode data of the read channel data and the type of data is determined (S202), the channel data is buffered in the buffer memory 11a. (S203).

The channel data buffered in the buffer memory 11a is directly sent to the back end chip 12. The back end chip 12 decodes main channel data of the received channel data. S204) After the decoding is finished, the actual playback process is performed (S205).

In the case of CD data, a frame composed of 24 bytes is composed of 98 sector units (98 × 24 bytes). In the buffering process, each frame is interleaved according to a predetermined rule. .

In other words, the sector currently being buffered is not 98 consecutive frames read recently, but the frames previously read and stored by interleaving are shuffled by a certain rule.

Therefore, it is almost impossible to read back exactly where the error occurred with an error in the data that is currently buffered.

Therefore, there is a problem that the error data can not be read again, so that the data with the error is reproduced as it is, causing user dissatisfaction.

An object of the present invention is to provide an optical recording and reproducing method suitable for improving the reproducing performance of an optical recording and reproducing apparatus by preventing a defective data being reproduced.

1 is a schematic block diagram of a general optical recording and reproducing apparatus

2 is a flowchart showing an optical recording and reproducing method according to the prior art.

3 is a flowchart showing an optical recording and reproducing method according to the present invention.

The optical recording and reproducing method according to the present invention includes a first step of reading channel data from a recording medium, a second step of buffering the read channel data, and a size of the buffered channel data not smaller than a predetermined setting value. A third step of recovering the subcode data from the channel data, a fourth step of monitoring the error occurrence state of the recovered subcode data and rereading the corresponding channel data if it is determined that an error has occurred; And a fifth step of returning to the step.

Preferably, if it is determined that an error does not occur in the sub code data recovered as a result of the error occurrence situation monitoring in the fourth step, decoding the main channel data of the buffered channel data, and reproducing the decoded main channel data. Characterized in that it further comprises the step of.

Preferably, the method further includes the step of designating a position and identifying a data type by using the subcode data of the channel data read after the first step.

Preferably, the predetermined setting value is a margin value set in a buffer memory in which the channel data is buffered.

Other objects, features and advantages of the present invention will become apparent from the following detailed description of embodiments taken in conjunction with the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

The present invention proposes an optical recording / reproducing method which can read back the data having an error when the data read from the optical recording medium has an error.

To this end, an error situation of the subcode data used at the time of reading the channel data is read, and if necessary, the channel data of the same location is input again and used.

However, since the CRC (Circular Redundancy Code) of the subcode data lacks an error processing capability, it is often determined to be an error even when there is no error in the actual channel data. Therefore, it is insufficient to determine whether an error of main channel data occurs only by CRC of single subcode data.

Accordingly, in the present invention, the CRC of a plurality of sub code data is collected to determine an error occurrence state of channel data.

The buffer memory 11a is considered to be empty until a certain margin of data is collected in the buffer memory 11a to give time for the determination of such an error occurrence situation.

In this sense, the margin of the buffer memory 11a is hereinafter referred to as a buffer empty margin.

Fig. 3 is a flow chart showing an optical recording / reproducing method according to the present invention, in which the optical recording / reproducing apparatus firstly plays a front-end chip in order to reproduce data recorded on an optical recording medium loaded thereon, for example, CD. In step 11, channel data is read from the CD (S301).

Subsequently, the position is designated using the subcode data of the read channel data and the type of data is identified (S302), and then the channel data is buffered in the buffer memory 11a (S303). .

Subcode data is recovered for error verification (S304), and it is determined whether the channel data currently buffered in the buffer memory 11a is not smaller than the buffer empty margin (S305).

As a result of the determination, if the channel data stored in the buffer memory 11a is smaller than the buffer amplifier margin, it is assumed that the buffer is empty, and the process returns to step 301 (S301) to continue channel data from the CD. Is read and buffered in the buffer memory 11a, and the subcode data is recovered until the size of the buffered channel data is not smaller than the buffer amplifier margin.

On the other hand, if the data stored in the buffer memory 11a is not smaller than the buffer amplifier margin as a result of the determination, that is, if the data stored in the buffer memory 11a is greater than or equal to the buffer amplifier margin, an error of the recovered subcode data occurs. The situation is monitored (S306).

Then, it is determined whether an error has occurred (S307). If it is confirmed that an error has occurred, the channel data is read again from the CD (S308) and the process returns to the above step 302 (S302).

On the other hand, if it is determined that no error occurs, the corresponding channel data is transmitted to the backend chip 12 to decode the main channel data (S309), and then the process of reproducing the decoded main channel data is performed (S310). .

As described above, the optical recording and reproducing method of the present invention does not reproduce the data read from the optical recording medium but reproduces the data again without reproducing the data, thereby improving the reproduction performance of the optical recording and reproducing apparatus. have.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the examples, but should be defined by the claims.

Claims (4)

A first step of reading channel data from the recording medium; A second step of buffering the read channel data; Recovering subcode data from channel data until the size of the buffered channel data is not smaller than a predetermined setting value; Monitoring the error occurrence state of the recovered subcode data and re-reading corresponding channel data when it is determined that an error has occurred; And, And a fifth step of returning to said second step. The method of claim 1, Decoding main channel data of the buffered channel data when it is confirmed that no error occurs in the sub code data recovered as a result of the error occurrence situation monitoring in the fourth step; And, And reproducing the decoded main channel data. The method of claim 1, And specifying the position using the subcode data of the channel data read after the first step and determining the type of data. The method of claim 1, And said predetermined value is a margin value set in a buffer memory in which said channel data is buffered.