KR20020088145A - Method for reading the PMA information or TOC information - Google Patents

Abstract

PURPOSE: A method for reading reproducing information of an optical disk is provided to perform reproducing operation by using temporary recording information or TOC(Table Of Contents) information recorded at the optical disk, thereby performing normal reproducing operation with an optical disk not having been finalized. CONSTITUTION: A method for reading reproducing information of an optical disk includes the steps of vertically moving an optical pickup from the current position to the optical disk in inserting and loading the optical disk(S10); judging the kind of the optical disk from a peak level value of reflected signals detected during the vertical movement(S11); moving the optical pickup to a start position of a lead-in area of the optical disk in case that the optical disk is a CD-ROM(S20-S22); and moving the optical pickup to a start position of a program memory area of the optical disk in case that the optical disk is a CD-R or CD-RW(S30-S31).

Description

Method for reading the PMA information or TOC information

The present invention relates to an optical disc information reading method in which a normal reproducing operation is performed even for an optical disc in a state where recording is not finalized after data is recorded.

In general, for optical discs that are not finalized after recording data in the disc recording device, only temporary recording information for disc reproduction exists in the PMA (Program Memory Area), but still in the lead-in area. Playlist information (TOC: Table Of Contents) is not recorded in the state. However, the conventional CD-players are difficult to access the PMA structurally, and thus the playback operation is performed by using the TOC information. Thus, such a CD-player is used to record an optical disc that has not been recorded. There was a problem that can not play.

Therefore, the present invention was created in order to solve the above problems, and a normal reproduction operation is performed from the temporary recording information recorded in the temporary recording information area (PMA) even for the optical disc in the unrecorded state after data recording. An object of the present invention is to provide a method of reading optical disc information.

1 is a block diagram of an optical disc driving apparatus (CD Player) for implementing an optical disc reproduction information reading method according to the present invention.

2A and 2B show a flow of a preferred embodiment of the optical disc reproduction information reading method according to the present invention;

3 shows each storage area of the optical disc,

4A and 4B show a flow of another embodiment of an optical disc reproduction information reading method according to the present invention.

※ Explanation of symbols for main parts of drawing

10 optical disc 11: spindle motor

20: optical pickup 21: sled motor

30: R / F section 31: signal level detection section

40: digital signal processing unit 50: servo unit

51: drive unit 60: microcomputer

61: memory

According to an aspect of the present invention, there is provided a method of reading an optical disc play information, comprising: a first step of determining the type of the optical disc at a current position of an optical pickup when the optical disc is inserted and mounted; And a second step of moving the optical pickup to a reproduction information storage area or a temporary recording information area of the optical disc and reading out information recorded at the position according to the discriminated optical disc type.

In addition, the first step of moving the optical pickup to the playback information storage area of the optical disk when the optical disk is inserted and mounted; And a second step of moving the optical pickup to a temporary recording information area located further inward of the reproduction information storage area and reading information at the position when a data reading error occurs in the reproduction information storage area. Each one has its characteristics.

Best Mode for Carrying Out the Invention A preferred embodiment of the optical disc reproduction information reading method according to the present invention will be described in detail with reference to the accompanying drawings.

1 shows a configuration of an optical disc drive device (CD Player) for implementing an optical disc reproduction information reading method according to the present invention, comprising: a spindle motor 11 for rotating an optical disc 10; An optical pickup 20 for reading recorded data on the optical disc 10; A sled motor 21 for horizontally moving the optical pickup 20; An R / F unit 30 for filtering the reproduced RF signal detected by the optical pickup 20 and outputting the filtered RF signal as a binary signal; A signal level detector (31) for detecting a signal level of the high frequency reproduction signal (RRF) output from the R / F unit (30); A digital signal processor (40) for restoring the binary signal to original data with its clock synchronized with the binary signal; A drive unit 51 for driving the spindle motor 11 and the sled motor 21; A servo unit (50) for controlling the driving of the drive unit (51) from the tracking error signal (T.E) and focusing error signal (F.E) of the optical pickup (20) and the rotational speed of the optical disc (10); A memory 61 for storing temporary write information or TOC information read out from the optical disc 10; And a microcomputer 60 which performs a reproducing operation by using the stored information and determines the type of the optical disc 10 based on the detected signal level.

2A and 2B show a flow of a preferred embodiment of a track jump control method for an optical disc according to the present invention. Hereinafter, the reproduction information of FIGS. 2A and 2B according to the present invention will be described with reference to the configuration of FIG. The reading method is explained in detail.

First, the microcomputer 60 has a start position (a in FIG. 3) and an end position (b in FIG. 3) of the temporary recording information area PMA of the optical disc 10, and a start position of the lead-in region (FIG. 3). B) and the end position (c of FIG. 3) are stored, and the optical pickup 20 is moved to the start position of the PMA or lead-in area when the optical disc 10 is inserted and placed thereafter. Will be read.

When the optical disk is inserted and seated in such a state (S10), the microcomputer 60 performs a predetermined initial operation, that is, the microcomputer 60 performs the optical disk through the servo unit 50 and the drive unit 51. 10, the optical pickup 20 is moved vertically to the initial position where the recording data on the optical disc 10 can be read. The microcomputer 60 determines the type of the inserted optical disc 10 during the vertical movement of the optical pickup 20. This process is as follows.

The R / F unit 30 filters and outputs the signal detected by the optical pickup 20, and the signal level detector 31 outputs the reflected signal RRR which is an output signal of the R / F unit 30. ) Peak level. Accordingly, the microcomputer 60 determines the type of the optical disc 10 from the detected peak level of the reflected signal (S11). For example, when the peak level of the detected reflected signal is 0.25V or less. The optical disc 10 is identified as a CD-R or CD-RW disc.

For reference, in the case of a CD-R disc and a CD-RW disc, the peak level of the reflected signal is similar.

When the type of the optical disc 10 is determined in this manner, the microcomputer 60 sets the gain of the R / F unit 30 based on the determination result. When 10 is determined to be a CD-R or CD-RW disc, the microcomputer 60 sets the gain of the R / F unit 30 to 13 dB.

In addition, the microcomputer 60 moves the optical pickup 20 horizontally from the current position to the target position according to the determination result. If the optical disc 10 is determined to be a CD-ROM (S20). The microcomputer 60 drives the sled motor 21 through the servo unit 50 and the drive unit 51, thereby starting the optical pickup 20 from a current position in the lead-in region. 3 b: the diameter of 48 mm) (S21), and if the optical disk 10 is identified as CD-R or CD-RW as described above (S40), the sled motor 21 is driven. By moving the optical pickup 20 from the current position to the start position of the PMA (a: 47.4mm diameter in Fig. 3) (S41), the PMA read in accordance with the movement of the optical pickup (Fig. 3) Temporary recording information of a to b or TOC information of the lead-in area (b to c in Fig. 3) is stored in the memory 61 (S22 and S42).

As described above, in the state in which the forest log information or the TOC information is stored in the memory 61, the microcomputer 60 performs a playback operation based on the stored information at a later time when a playback request of the optical disc 10 is performed (S30, S50). In this case (S31, S51), even in the case of an optical disc in a state in which recording is not finalized after data recording, normal reproduction operation is performed from the temporary recording information recorded in the PMA.

4A and 4B show a flow of another embodiment of an optical disc reproduction information reading method according to the present invention. Hereinafter, the reproduction information readings of Figs. 4A and 4B according to the present invention will be described with reference to the configuration of Fig. 1 driving apparatus. The method will be described in detail.

First, as described above, the microcomputer 60 starts and ends the position (a in FIG. 3) and the start position (b in FIG. 3) of the PMA of the optical disc 10, and the start position (a in FIG. 3). ) And the end position (b of FIG. 3), when the optical disc is inserted and seated (S60), the microcomputer 60 moves the optical pickup 20 vertically to a predetermined initial position (S61).

When the vertical movement of the optical pickup 20 is completed (S70), the microcomputer 60 leads the optical pickup 20 from the current position to the lead-in area through the servo unit 50 and the drive unit 51. After moving to the start position (b of FIG. 3), the recorded TOC information is read (S71). If a data read error occurs in the lead-in area (S80), the microcomputer 60 reads the optical disc ( 10) is determined to be a disc that has not been finalized before, and the optical pickup 20 is moved back from the current position (b in FIG. 3) to the start position of the PMA (a in FIG. 3). (S90).

According to the movement as described above, the optical pickup 20 reads TOC information of the lead-in area (b to c of FIG. 3) or temporary recording information of PMA (a to b of FIG. 3). Information is stored in the memory 61 (S81, S91). Therefore, the microcomputer 60 performs a reproducing operation based on the stored information at a later request for reproducing the optical disc 10 (S82, S92), so that the optical disc is not recorded after the data is recorded. In addition, the normal reproduction operation is performed from the temporary recording information recorded in the PMA (S83, S93).

As mentioned above, preferred embodiments of the present invention are disclosed for the purpose of illustration, and those skilled in the art can improve and change various other embodiments within the spirit and technical scope of the present invention disclosed in the appended claims below. , Replacement or addition would be possible.

In the optical disc reproduction information reading method according to the present invention as described above, a reproduction operation is performed by using temporary recording information or TOC information recorded on the optical disc, so that the optical disc is not recorded after the data is recorded. It is also a very useful invention that the normal reproduction operation is made.

Claims (5)

A first step of determining the type of the optical disk at the current position of the optical pickup when the optical disk is inserted and mounted; And And a second step of moving the optical pickup to a reproduction information storage area or a temporary recording information area of the optical disc and reading out information recorded at the position according to the discriminated optical disc type. . The method of claim 1, The first step includes the step of vertically moving the optical pickup from the current position to the optical disk side when the optical disk is inserted and mounted; And And determining the type of the optical disc from the peak level value of the reflection signal (RRF) detected during the vertical movement. The method of claim 1, In the second step, when the determined type of the optical disc is a read-only optical disc (CD-ROM), the start position of the lead-in area of the optical disc is used. The type of the determined optical disc is a recordable optical disc. (CD-R or CD-RW), the optical disk playback information reading method characterized in that the movement to the start position of the program memory area (Program Memory Area) of the optical disk. A first step of moving the optical pickup to a reproduction information storage area of the optical disk when the optical disk is inserted and mounted; And An optical disc comprising a second step of moving the optical pickup to a temporary recording information area located further inside the reproduction information storage area when the data read error occurs in the reproduction information storage area and reading information at the position thereof; How to read playback information. The method of claim 4, wherein And a third step of performing a reproducing operation on the optical disc in a non-finalized state by using the read temporary record information.