KR0154751B1 - Method for controlling an editting list point - Google Patents

Abstract

[Technical field to which the invention described in the claims belong]

A device for playing a compact disc.

[Technical Challenges to Invent]

Provided is a method for identifying various compact discs in a cam compact disc player.

[Summary of the solution of the invention]

The compact disc discrimination method according to the present invention analyzes the PSEC information recorded in the Azero position of the list table data area of the compact disc and determines whether the disc is a digital audio compact disc type compact disc interactive type. Whether the disk is a disk or a photo compact disk. When the disc type is determined to be a digital audio compact disc type disc, a graphical compact disc and a digital audio compact disc are discriminated using 10 frame data being read within a predetermined time, and the disc is determined as a compact disc interactive type disc. In this case, the compact disc interactive and the video compact disc are discriminated using 2 second 16 frame data and whether the video compact disc directory is read.

[Important Uses of the Invention]

A device for reproducing various compact discs.

Description

Compact Disc Identification Method through Directory Structure Analysis

1 is a block diagram of a compact disc-interactive player to which the present invention is applied.

2 is a flowchart of a disc identification mode according to the present invention;

* Explanation of symbols for main parts of the drawings

10: disc drive unit 20: signal processing unit

30: display unit 40: control unit

50: operation unit 60: bus

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for playing a compact disc (hereinafter referred to as a CD), and more particularly, to a method for determining what kind of CD is a CD to be played before playing various CDs.

Typically, CDs are compact disc-digital audio (CD-DA) recording pulse code modulation audio data, and adaptive differential pulse code modulation (CD) audio data. , Compact Disc Interactive (CD-I) with recorded video data and programs, and CD-I Ready (or Compact Disc Interactive Ready with PCM audio data, video data and programs) CD-I / CD-DA). However, in addition to typical CDs, new types of discs are now emerging based on the disc formats of these CDs. For example, there are a Graphic CD based on a CD-DA disc format, and a Video CD based on a CD-I disc format. There are also new discs of the CD-I bridge type, such as Photo CDs.

On the other hand, for each of the various types of CDs as described above, there are independent playback devices, for example, a CD player for playing CD-DA, a CD-I player for playing CD-I, There are a photo CD player for reproducing a photo CD on which a digitally processed 35 mm image is recorded, and a graphic CD player for reproducing a graphic CD in which characters and music are recorded together on still images. Such CD playback apparatuses require a method of determining what kind of CD each CD is before playing a CD, and performing a corresponding operation when the CD is a suitable CD. In response to such a requirement, a method of determining what kind of CD to be played is applied and used in a CD-I player. According to the method applied to the CD-I player, by reading the Table of Contents (TOC) data from the disc and using the PSEC information recorded at the position A0 of the TOC data, it is possible to determine what kind of CD is.

However, this discriminant method is not suitable for discriminating various types of CDs because the disc types are classified into only CD-I type discs and CD-DA type discs. For example, a video CD using the same PSEC information as CD-I would be incorrectly identified as CD-I, and a graphic CD using the same PSEC information as CD-DA would be incorrectly identified as CD-DA. This problem will become more severe when various types of CDs are played using a single player such as a CD-I player.

Accordingly, an object of the present invention is to provide a method for accurately determining the type of CD to be played when playing a CD in a CD player.

Another object of the present invention is to provide a method for analyzing a directory structure of a CD in a CD player.

In accordance with the above objects, the present invention provides a method for determining the type of CD through analysis of PSEC information, frame data, and directory structure recorded at A0 position of the TOC area of the CD.

The CD discrimination method according to the present invention reads the PSEC information recorded at the A0 position of the TOC area on the CD and analyzes the read information to determine whether the disc is a digital audio type disc or a CD-I type disc. A first discriminant process of discriminating graphic CDs and CD-DAs using an inventory data analysis process and whether data of a first frame is read within a predetermined time when the disc is determined to be a digital audio type disc; When a CD-I type disc is identified, a second discrimination process is used to discriminate the video CD and the CD-I using whether the data of the second frame and the preset directory are read.

The first discrimination process may include reading 10 frames of data when the first song recorded on the disc appears within two minutes, and determining the disc as a graphic CD when the read data is a graphic CD format. Determining the disc as a CD-DA if the read data of the 10 frames is not in the graphic CD format, and determining the disc as a CD-I ready if the first track contained in the disc does not appear within 2 minutes. It consists of.

In addition, the second discrimination process includes determining the disc as a video CD when the data and the video CD directory of 2 seconds and 16 frames are read, and the data of the 2 second and 16 frames is read and the video CD directory is not read. Otherwise, the disc is determined by the CD-I, and when the data of the two seconds and 16 frames is not read, the disc is determined as an unknown disc.

Further, according to the inventory data analysis process, if the PSEC information recorded in the A0 position of the TOC area on the disc is 0, the disc is determined to be a digital audio type disc, and if the PSEC information is 10, the disc is compact. The disc is determined to be a disc of an interactive type. If the PSEC information is 20, the disc is determined as a photo CD.

DETAILED DESCRIPTION A detailed description of preferred embodiments of the present invention will now be described with reference to the accompanying drawings.

FIG. 1 is a diagram showing the configuration of an apparatus for reproducing various CDs, showing the block configuration of the CD player.

Referring to FIG. 1, the disc drive unit 10 plays back audio data, video data or programs recorded on the CD 2. The signal processor 20 generates an audio signal from the reproduced audio data, and generates a video signal from the reproduced video data. The display unit 30 preferably comprises a liquid crystal display (LCD), and displays an operation and a performance based on the generated video signal. The controller 40 performs a predetermined program to control the overall operations of the disc drive unit 10 and the signal processor 20. The operation unit 50 is for driving a user's request for the CD 2 and is connected to the disc driving unit 10. The bus 60 is for data processing between the components of the compact disc player described above.

Next, referring to FIG. 1 and FIG. 2 showing the operation of the disc identification mode according to the present invention, a method of determining the types of various CDs will be described.

When the user loads the CD 2 into the disc drive unit 10 and applies power through the operation unit 50, the CD player processes the disc identification mode operation as shown in FIG.

First, the microcomputer 46 checks whether the CD 2 is loaded in the disc drive unit 10 in step 200. If the CD 2 is loaded, a command for reading data of the TOC area on the CD 2 is transmitted to the subcomputer 18 in step 202. The subcomputer 18 controls the CD drive 16 to move the pick-up 14 to the TOC area on the CD 2 in response to the transmitted command. The subcomputer 18 also transmits data of the TOC area read by the tracking of the pickup 14 to the microcomputer 46.

In steps 204 and 218, the microcomputer 46 analyzes the PSEC information located in A0 (hereinafter referred to as A0 PSEC information) among the data in the TOC area, and primarily determines the type of the CD 2. . When the A0 PSEC information is 0, the microcomputer 46 determines the type of the CD 2 as a digital audio CD type disc, and when the A0 PSEC information is 10, the type of the CD 2 is CD-I type. The disc 2, and when the A0 PSEC information is 20, the type of the CD 2 is determined as the photo CD.

If it is confirmed in step 204 that the A0 PSEC information is 0, that is, the type of the CD 2 is determined to be a digital audio CD type disc, the microcomputer 46 checks on the CD 2 in step 206. It is checked whether the first track recorded in the track appears within a predetermined time, preferably within 2 minutes. If the first track recorded on the CD 2 appears after 2 minutes has elapsed, the microcomputer 46 determines the type of the CD 2 as a CD-I ready in step 208, and before 2 minutes have elapsed. When the first track recorded on the CD 2 appears, step 212 is performed to read 10 frame data on the CD 2. In this case, if the read data of the 10 frames is the graphic CD format data in step 214, the microcomputer 46 determines that the CD 2 is the graphic CD in step 216. In step the microcomputer 46 determines that the CD 2 is a CD-DA.

If it is determined in step 218 that the A0 PSEC information is 10, that is, the type of the CD 2 is determined to be a CD-I type disk, then in step 220, the microcomputer 46 returns to the subcomputer 18. Control to move the pickup 14 to 2 seconds and 16 frames of the CD 2 to read data on two seconds and 16 frames, and store the read data on the two seconds and 16 frames in the RAM 42 at this time. If it is confirmed in step 222 that data on two seconds and 16 frames is not read, in step 224, the microcomputer 224 determines the CD 2 as an unknown disk. Next, in step 226, the microcomputer 46 reads two-second 16-frame data from the contents stored in the RAM 42 and indicates the CD-I. The sector number of the point indicating the table is found and a command is sent to the subcomputer 18 to read the sector. The subcomputer 18 moves the pickup 14 to the designated sector in accordance with the command, reads a path table, and transmits the read data to the microcomputer 46. The microcomputer 46 temporarily stores the data of the transmitted route table in the RAM 42, and checks in step 228 whether the VCD directory structure exists in the route table. At this time, if the microcomputer 46 determines that the VCD directory structure exists in the path table, the microcomputer 46 determines the CD 2 as a video CD in step 230, and if it is determined that the VCD directory structure does not exist, the CD 2 ) Is determined by CD-I.

If it is confirmed in step 204 and step 218 that the A0 PSEC information is not 0 and 10, the microcomputer 46 checks whether the A0 PSEC information is 20 in step 234. At this time, if it is confirmed that the A0 PSEC information is 20, the microcomputer 46 determines the CD 2 as the photo CD in step 236, and if it is determined that the A0 PSEC information is not 20, the microcomputer ( 46 identifies the CD 2 as an unknown disk.

The microcomputer 46 determines the CD determined in steps 208, 210, 216, 224, 230, 232, 236, or 238. The type of (2) is assigned to the subcomputer 18, and displayed on the display section 30 in a form that can be understood by the user.

As described above, the present invention can distinguish the CD-I from the video CD by checking whether the PSEC information of the TOC region, the 2 second 16 frame data, and the VCD directory exist. In addition, the CD-DA and the graphic CD can be distinguished by analyzing the PSEC information of the TOC area and 10 consecutive frame data.

Accordingly, even when various types of CDs are reproduced in a single CD player, there is an advantage that it is possible to determine what kind of CDs are to be reproduced.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

Claims (7)

A method for determining the type of a compact disc, comprising: reading information recorded at a predetermined position of a list table area on a compact disc and analyzing the read information to determine whether the disc is a digital audio type disc or a compact disc interactive type disc. First discrimination for discriminating a graphics compact disc and a digital audio compact disc using a list table data analysis process for determining whether the disc is a digital audio type disc and whether data of the first frame is read within a predetermined time when the disc is determined as a digital audio type disc. And a second discriminant process of discriminating the video compact disc and the compact disc interactive using the data of the second frame and whether the preset directory is read when the disc is determined to be a compact disc interactive type disc. Characterized by Discrimination method. The method of claim 1, wherein the second discrimination process comprises: determining that the disc is a video compact disc when data of 2 seconds and 16 frames and a video compact disc directory are read, and wherein the data of 2 seconds and 16 frames is read; And discriminating the disk from the compact disk interactive if the video compact disk directory is not read. 3. The method of claim 2, wherein the discriminating step further comprises the step of discriminating the disk as an unknown disk when data of the two seconds and 16 frames is not read. The method of claim 1, wherein the first discrimination process reads 10 frames of data when the first song recorded on the disk appears within 2 minutes, and converts the disk into a graphic compact disk format when the read data is a graphic compact disk format. And determining the disc as a digital audio compact disc when the read data of the 10 frames is not a graphic compact disc format. The method as claimed in claim 4, wherein the first discrimining step further comprises the step of discriminating the disc as a compact disc interactive ready if the first track contained in the disc does not appear within 2 minutes. 6. The method according to any one of claims 1 to 5, wherein the catalog data analysis process is performed by digitally displaying the disk when PSEC information recorded at the zero (A0) position of the catalog table area on the disk is zero. Discriminating the disc as an audio type disc and discriminating the disc as a compact disc interactive type disc when PSEC information recorded at the Azero position of the catalog table area on the disc is 10. Discrimination method characterized in that the configuration. 7. The method of claim 6, wherein the catalog data analysis process further comprises the step of discriminating the disk as a photo compact disk when the PSEC information recorded at the A zero position of the catalog table area on the disk is 20. Discrimination method characterized in that.