KR19990084716A - How to play optical disc - Google Patents

Abstract

According to the present invention, when an optical disc is inserted, the type of the optical disc is determined from the playlist information of the optical disc, and when the determined type of the optical disc is not a digital audio CD, the data on the optical disc is recorded on the video CD. The present invention relates to an optical disc reproducing method that enables playback of a video CD in which playlist information is recorded incorrectly by recognizing and reproducing the data format. A type of optical disc inserted from playlist information recorded on an optical disc. Determining a first step; A second step of recognizing a video CD when the determined optical disc is not a digital audio CD; And a third step of reproducing the data on the optical disc as moving picture data, so that the video CD can be reproduced irrespective of the error of the playlist information recorded on the inserted video CD. It is a useful invention that improves the reproducibility of a user, thereby preventing user complaints in advance and reducing the service time of the reproducing apparatus.

Description

How to play optical disc

The present invention relates to an optical disc reproducing method of determining the type of an inserted optical disc and reproducing it accordingly. More specifically, the type of the optical disc is determined from the playlist information of the optical disc when the optical disc is inserted. Then, if the type of the determined optical disc is not a digital audio CD, the data on the optical disc is recognized and played back as a video data format of the video CD, so that playback of the video CD in which the playlist information is recorded incorrectly can be performed normally. An optical disc reproduction method.

1 is a general configuration diagram of an optical disk reproducing apparatus, which includes a pickup section 11 for detecting a recording signal from the surface of an inserted optical disk 10; Motors M1 and M2 for rotating the pick-up part 11 and the inserted optical disc 10, respectively; A drive unit 30 for driving the motors M1 and M2; An R / F unit 20 for filtering the signal detected by the pickup unit 11; The drive of the drive unit 30 is controlled from the output signal of the R / F unit 20 and the rotational speed of the optical disk 10, and the synchronization of the output signal of the R / F unit 20 is detected. Servo unit 40; A digital signal processor (50) for restoring a signal read by the R / F unit (20) to a digital signal and restoring the original compressed video data using the detected synchronization; An MPEG decoder 60 for decoding the reconstructed moving picture compressed data into image data and audio data; A microcomputer 70 for determining the type of the inserted optical disc 10 and controlling the reproduction operation accordingly; And a memory 80 for storing playlist information recorded in the inserted optical disc 10. As shown in FIG.

In the optical disc reproducing apparatus configured as described above, when the optical disc 10 in which a moving picture is compressed and stored is inserted into the optical disc reproducing apparatus, the microcomputer 70 before reproducing and outputting a specific song (or item) is performed. The pickup unit 11 is controlled through the drive unit 30 to read playlist information (TOC information) recorded in track 0 and track 1 (Lead-In) of the inserted optical disc 10. As shown in FIG. 2, the playlist information includes information on the total number of points (POINT), the playing time of each song (MIN, SEC, FRAME), and the absolute time of starting each song (PMIN, PSEC, PFRAME). The information is read by the pickup section 11. The high frequency signal read out from the pick-up section 11 is filtered through the R / F section 20, and the filtered clean signal is synchronized with the servo section 40, and the digital signal is detected. The processing unit 50 restores the original digital data by the detected synchronization.

Accordingly, the microcomputer 70 stores playlist information of tracks 0 and 1 of the optical disc 10 restored by the digital signal processing unit 50 in the memory 80, and stores the points (in the stored playlist information). From the data recorded in the POINT) field, the type of the inserted optical disc 10 is discriminated. The data recorded in the point field is the music number (01, 02, 03,. In the case of a value sequentially indicating ..), the microcomputer 70 determines the inserted optical disc 10 as a digital audio CD (CD-DA), and if the recorded data of the point field is B in FIG. In the case of including the character values A0, A1, A2, ... as in the form, the microcomputer 70 transfers the inserted optical disc 10 to a CD-ROM or a video CD-VCD. You will be judged.

If, as a result of the optical disc type determination of the microcomputer 70, the type of the optical disc 10 is determined to be a CD-ROM or a VCD, the optical disc is stored from data recorded in the PSEC field in the playlist information. The type of (10) is determined in detail, and when the value is 0 ₍₁₆₎ , the optical disc 10 is judged to be a CD-ROM, and when the value is 20 ₍₁₆₎ , it is determined as a VCD.

If the recording data of the PSEC field is 0, and the micom 70 determines that the optical disc 10 is a CD-ROM, the microcomputer 70 determines that the inserted optical disc 10 is a general CD. Alternatively, if the disc is not loaded and the playback is not performed, and the recording value of the PSEC field is 20 _{(16), the} optical disc 10 is determined as VCD. Accordingly, the microcomputer 70 determines that the servo unit 40 is used. And the pickup unit 11 through the drive unit 30 to move the pickup unit 11 to the selected playback area on the optical disc 10.

The pickup unit 11 reads data on the optical disc 10 at the moved position, and the read data is passed through the R / F unit 20 and the digital signal processing unit 50 to the servo unit 40. After reconstructing the moving image data by the data synchronization detected by the decoding, the MPEG decoder 60 decodes the image data and the audio data and reproduces the data.

However, in the conventional optical disc discriminant playback method as described above, the PSEC field is recorded even though the data format on the inserted optical disc is recorded in the VCD form due to minor recording error of playlist information of the optical disc or the like. If the value is recorded incorrectly as 0, the player recognizes that the inserted optical disc is a CD-ROM and does not play it. To judge, there was a problem that caused complaints and unnecessary service requests for the product.

Accordingly, the present invention has been made to solve the above problems, and provides an optical disc reproducing method that enables normal reproduction of a video CD regardless of a recording error of playlist information in an inserted video CD. The purpose is.

1 shows a general configuration of an optical disc reproducing apparatus,

Fig. 2 shows the data format of playlist information (TOC information) recorded in the Lead-In area on the optical disc,

Fig. 3 shows the structure of an optical disc reproducing apparatus for implementing the optical disc reproducing method according to the present invention.

Fig. 4 is a flowchart showing the flow of one embodiment of an optical disk reproducing method according to the present invention.

※ Explanation of code for main part of drawing

M1, M2: motor

10 optical disc 11 pick-up part

20: R / F section 30: drive section

40: servo unit 50: digital signal processing unit

60: MPEG decoder 70: Microcomputer

80: memory 81: ROM

90; OSD

According to an aspect of the present invention, there is provided a method of reproducing an optical disc, comprising: a first step of determining the type of an inserted optical disc from playlist information recorded on the optical disc; A second step of recognizing a video CD when the determined optical disc is not a digital audio CD; And a third step of reproducing the data on the optical disc as moving picture data.

In the optical disc reproducing method according to the present invention as described above, when the optical disc is first inserted, the playlist information recorded on the inserted optical disc is read out and the type of the optical disc is determined therefrom. As a result of the discrimination, if the inserted optical disc is not a digital audio CD, the optical disc is immediately recognized as a video CD, and the data on the optical disc is restored to moving image data having a format according to the determination, thereby reproducing it.

Best Mode for Carrying Out the Invention Preferred embodiments of the optical disk reproducing method according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 shows a configuration of an optical disk reproducing apparatus for implementing the optical disk reproducing method according to the present invention, in which a font for an on-screen display (OSD) is stored in the above-described configuration of FIG. ROM 81; In addition, the OSD unit 90 for converting and outputting the corresponding character from the character font stored in the ROM 81 in the form of a video signal is further included.

FIG. 4 shows the flow of an embodiment of an optical disk reproducing method according to the present invention. Hereinafter, the reproducing method of FIG. 4 will be described in detail with reference to the configuration of FIG.

First, according to the insertion of the optical disc (S10), the optical disc is read from the read storage (S11) of the playlist information on the inserted optical disc 10 and the point field value of the read-stored playlist information. Step (S12) for determining the type of (10) is made in the same manner as the conventional method described above, wherein, in the process of determining the type of optical disc 10, the microcomputer 70 in the read and stored playlist information If it is recognized from the value recorded in the point field that the inserted optical disc 10 is not a digital audio disc (CD-DA) (S20), the microcomputer 70 selects the inserted optical disc 10. Once recognized as a VCD (S21).

When the optical disc 10 in which the microcomputer 70 is inserted is determined to be a CD-DA, the microcomputer 70 controls the components to reproduce the optical disk 10 as in the related art. If the optical disc 10 into which the microcomputer 70 is inserted is judged to be a VCD instead of the CD-DA, the microcomputer 70 stores the PSEC field in the read and stored playlist information as described above. Check the value recorded in S22, and even if the value is 0 (S30), it is only stored in the ROM 81 without changing the VCD recognition state of the inserted optical disc 10. Text data for a playback error possible message from the OSD text fonts. For example, text fonts corresponding to "The inserted disc may not play properly" may be read and transmitted to the OSD unit 90. do.

The OSD unit 90 converts and outputs the input text font into a corresponding video image signal (S31), so that even if the user does not normally play the optical disk 10, the cause of the malfunction of the playback apparatus is reduced. It is possible to recognize that the disc is not inserted into a disc that is not suitable for reproducing, so that appropriate measures such as replacing the disc or driving a suitable reproducing apparatus are performed.

After outputting the reproduction error possibility message as described above, the microcomputer 70 receives the optical disc 10 through which the pickup unit 11 is recognized as a video CD through the servo unit 40 and the drive unit 30. By moving to the corresponding play area selected on the ()), the optical disc 10 is reproduced as described above (S32), so that it is possible to normally watch the video in the video CD having a recording error of the playlist information. If the data recorded in the PSEC field is 20 ₍₁₆₎ (S40), the microcomputer 70 determines that the inserted optical disc 10 has no recording error of the playlist information, thereby enabling playback error. The optical disc 10 can be reproduced as described above without outputting the message (S32).

The optical disc reproducing method according to the present invention as described above allows the video CD to be reproduced irrespective of the error of the playlist information recorded on the inserted video CD, thereby improving the ability to reproduce data errors on the disc. Accordingly, it is a useful invention that not only blocks the user's complaint factor in advance, but also reduces the service time of the playback apparatus.

Claims (3)

A first step of determining the type of the inserted optical disc from the playlist information recorded on the optical disc; A second step of recognizing a video CD when the determined optical disc is not a digital audio CD; And And a third step of reproducing the data on the optical disc as moving picture data. The method of claim 1, The second step, Judging the type of the optical disc from the playlist information; And And outputting a reproduction error possible message according to the detail discrimination result. The method of claim 1, The type discrimination in the first step is performed according to the value of data recorded in the point field of the playlist information.