KR100257665B1 - A method for reproducing conversion and version detection in a video compact disc - Google Patents

Abstract

PURPOSE: A methods for verifying a version and switching a reproduction of a video compact disk is provided to minimize a detecting error of version information of a video CD to be reproduced. CONSTITUTION: Information of a video CD is read in a pickup unit and stored in a memory. A micro computer reads version information of a video CD to be reproduced firstly from an INFO.VCD out of the information stored in the memory(S111). The micro computer confirms whether the version information is 1.1 or 2.0(S120). If the version information is 2.0, the micro computer does not set an initial value for the version 2.0, and confirms whether a reproduction order information(PSD, VCD) included only the version 2.0 is existed in a track 1 of the video CD(S130). If the reproduction order information(PSD, VCD) is existed, the micro computer perceives as a video CD of the version 2.0 and sets an initial value of variables needed for reproducing thereof(S131). It is conformed whether a high sound quality data track is existed in TOC information read previously(S140). If a high sound quality data track is existed, the first track position is stored in the memory. If a user inputs a key for performing a reproduction(S142), the video CD is reproduced(S143). The micro computer decides whether the current track position is corresponded to the position of the high sound quality data track stored in the memory(S144). Although the current track position is corresponded to the position of the high sound quality data track, the mode is not switched into a high sound quality reproducing mode. Also, it is confirmed whether the sixth bit of a sub-Q data of a reproducing track is '0'(S150). If the sixth bit is '0', the high sound quality data are signal-processed and outputted.

Description

Version verification and playback switching method of video compact disc

The present invention relates to a version verification and playback switching method of a video compact disc which verifies the existence of a version and high-quality data and switches a playback method. The method of verifying the version of the video compact disc, which distinguishes it from the version and verifies it, and when reproducing the video compact disc according to the verified version, reconfirms the existence of the confirmed high quality data immediately before playing, thereby switching to the high quality reproduction accordingly. It relates to a regeneration switching method.

The latest version 2.0 of a video compact disc (hereinafter referred to as a "video CD") that compresses and stores a movie, as shown in FIG. 1, schedules the tracks of the read-in area and the data area track # 1. The video CD player includes information such as Table of Content (TOC), INFO.VCD, PSD.VCD (Play Sequence Descriptor), LOT.VCD (LOT: List id Offset Table), and ENTRIES.VCD in the time domain. By using the above information, it is possible to play from the desired part or change the playback flow by menu by the user's selection. Also, high quality data (cd-da) is selectively added to the latter part of the data area even when playing the audio signal. This makes it possible to reproduce near the original sound at the time of audio signal output. As such, with the emergence of a video CD having characteristics distinguished from previous versions, the video CD player has to perform a different playback method for video CDs composed of different information according to versions.

2 is a configuration diagram of a player for reproducing a video CD, comprising: a pickup section 10 for detecting a recording signal from the surface of a disc; A motor (M) for rotating the disk; A drive unit 13 driving the pickup unit 10 and the motor M; An RF unit 12 for filtering the signal detected by the pickup unit 10; A servo unit 20 which controls the driving of the drive unit 13 from the output signal of the RF unit 12 and the rotational speed of the disc, and detects synchronization of the output signal of the R / F unit 12; A digital signal processor (30) for restoring a signal read by the R / F unit (12) to a digital signal and restoring the original compressed video data using the detected synchronization; An amppack decoder 31 for decoding the reconstructed moving picture compressed data into image data and audio data; A memory (41) for temporarily storing various reproduction information of a video CD among the data restored by the digital signal processor (30); And a microcomputer 40 for controlling the components through a bus and performing a reproducing function which is distinguished according to the reproducing information stored in the memory 41.

FIG. 3 is a flowchart illustrating a conventional method of checking and reproducing a video CD in a video CD player configured as described above. Referring to FIG. 2, the video CD player of FIG. When the playback switching method is described in detail, when the inserted video CD is initially driven, the microcomputer 40 controls the drive unit 13 to move the pickup unit 10 to track 0 to record the track. The high frequency signal detected by the pickup unit 10 is filtered by the RF unit 12. The clean signal filtered by the RF unit 12 is detected by the servo unit 20 and restored to the original digital data by the detected synchronization by the digital signal processing unit 30.

The microcomputer 40 stores the recorded data of tracks 0 and 1 of the video CD restored by the digital signal processor 30 in the memory 41, and then stores the data corresponding to INFO.VCD and TOC. Then, the information of the video CD to be driven is detected (S11), and from this information it is checked whether the version information of the video CD is 1.1 or 2.0 (S20). If the checked version is 1.1, the initial values required for playback are set to be suitable for version 1.1 (S21), and when a playback request is made (S22), the video CD is played until the playback ends (S23). If the version information is 2.0, initial values necessary for playback are set to be suitable for version 2.0 (S30), and whether the track of the high quality data (cd-da) is present in the previously read TOC information is checked (S31). If present, the track position is stored in the memory 41 (S32).

When the user inputs the play key in the above state (S40), the pickup unit 10 moves to the selected track position to read the data of the video CD, and the read signal is transmitted to the RF unit 12. After reconstructing the moving image data through the digital signal processing unit 30, the decoding is output to the image data and the audio data by the amp pack decoder 31 to perform the reproduction (S41). In step S42, it is determined whether the track position currently being played corresponds to the high quality data track position that has been read out and pre-stored in the memory 41 (S42). As a result, the position of the currently playing track is a high quality data track. If it corresponds to the position, mode switching is performed so that audio signal reproduction using high quality data is performed (S43), and the position of the current playback track is the high quality data track position. If not applicable, will be present to perform reproduction processing and conventional, with aempaek and to continue to perform the audio signal playback mode (S44), this operation is repeated until the end of the play (S50) that.

However, when the video CD 2.0 is produced, the information of the video CD is correctly encoded and recorded, but the essential configuration data corresponding to the information, that is, the playback order information (PSD.VCD) or the high-quality data, etc. are missing, or the playback order is omitted. In the case of producing video CDs without information or high-quality data, there is a frequent occurrence of incorrect recording of video CD information. In this case, the version confirmation method and the playback switching method of the video CD as described above are performed. There is a problem that the playback operation of the video CD is often not performed correctly by performing the corresponding operation only with the version information and the high-quality data existence information read from the data and information list included in the data area of the. .

Accordingly, an object of the present invention is to provide a method for verifying a version of a video compact disc, which is designed to solve the above problems and can minimize error detection of version information of a video CD to be reproduced.

It is also an object of the present invention to provide a playback switching method of a video compact disc in which a switching error of the audio playback mode does not occur.

1 shows a sequence of data read sequentially from a 2.0 version of a video compact disc,

2 is a configuration diagram of a video compact disc player,

3 shows a flowchart of a conventional version checking and playback switching method when playing a video compact disc,

4 shows a flowchart of a version verification and playback switching method according to the present invention when playing a video compact disc.

* Explanation of symbols for main parts of the drawings

M: Motor 10: Pickup

12: RF unit 13: drive unit

20: servo unit 30: digital signal processing unit

31: MPEG decoder 40: Microcomputer

41: memory

Version verification method of a video compact disc according to the present invention for achieving the above object, the first step of detecting the version information of the compact disc from the information list of the compact disc; A second step of confirming the presence or absence of reproduction order information when the detected version information is a specific value; And a third step of verifying the detected version information according to whether or not the reproduction order information is present.

In addition, the playback switching method of the video compact disc according to the present invention comprises: a first step of confirming whether the current playback position matches the position of the high-quality data (cd-da) previously detected and stored; A second step of reading a value of a specific position of reproduction control information corresponding to the high quality data when the two positions coincide; Verifying whether the read value is a predetermined value and verifying the existence of high quality data; And a fourth step of switching the audio mode to the high sound quality reproduction mode according to the verification result.

In the method of verifying the version of a video compact disc according to the present invention, the version of the compact disc is first detected by checking the version of the compact disc from the information list of the video compact disc, and then the detected version information is a specific value. In the case of, the playback order information included only in the version checked according to the specific value is detected, and the checked version is checked again to perform a playback operation corresponding to the version when the two confirmed results are the same. Will be.

In addition, in the high quality reproduction switching method of the video compact disc according to the present invention as described above, if the playback is performed after first confirming the existence of the high quality data at the time of initial driving of the video compact disc, the current playback position is previously detected and stored in the high quality data. If the position is identical with each other, and if the two positions coincide with each other, the specific bit value of the sub cue data string, which is reproduction control information associated with the high quality data, is not immediately switched to the high quality data reproduction mode. If the output bit value is a predetermined value, the data of the currently played track is reconfirmed as high quality data, and the playback switching to the high quality reproduction mode is performed.

Best Mode for Carrying Out the Invention Preferred embodiments of the method for verifying and reproducing a video compact disc according to the present invention will be described in detail with reference to the accompanying drawings.

4 is a flowchart of a version verification method and a playback switching method of a video compact disc according to the present invention. Hereinafter, the version verification and playback switching method of FIG. 4 according to the present invention will be described with reference to the configuration of the video CD player of FIG. It explains in detail.

First, in the same manner as described above, when the video CD is initially driven, the information of the video CD is read from the pickup unit 10 and stored in the memory 41. The microcomputer 40 reads version information of a video CD to be played first from INFO.VCD among the information stored in the memory 41 (S111).

The microcomputer 40 checks whether the version information of the read disk is 1.1 or 2.0 (S120), and in the case of version 1.1, processes the same as the conventional method (S121, S122, ...). If the playback order information (PSD.VCD) included only in the 2.0 version is confirmed without setting an initial value for 2.0 (S130) and then the playback order information is confirmed to exist. Finally, it recognizes the video CD as version 2.0 and sets initial values of variables necessary for its reproduction (S131). As in the prior art, it is checked whether a high quality data track exists in the previously read TOC information (S140), and if so, the first track position is stored in the memory 41 (S141).

In the above state, when the user inputs a key for performing playback (S142), the playback of the video CD is performed (S143). During this playback operation, the microcomputer 40 is currently playing the track position. It is determined whether the read-out corresponds to the high-quality data track position previously stored in the memory 41 (S144), and even if the position of the current playback track corresponds to the high-quality data track position, it is not immediately switched to the high-quality playback mode. It is further checked whether the sixth bit of the sub-Q data of the playback track is zero (S150).

If the result of the check is zero, the digital data currently reproduced is recognized as an audio reproduction signal of high quality data, and the high quality data is signal-processed and output in accordance with the reproduced signal, thereby switching to the wrong audio processing mode due to data recording error. Will be prevented.

Version verification method of a video compact disc according to the present invention as described above, by verifying the result of the version detection using the information on the disc through the presence or absence of the essential configuration information, it is possible to increase the reliability of the detected version to appropriate playback for the version In the playback switching method of the video compact disc according to the present invention, the playback mode of the video compact disc switched in the track in accordance with the presence or absence information of the high quality data is further checked whether or not the actual high quality data is detected and switched to the corresponding mode. It is a practical invention to achieve a more accurate and reliable playback operation that minimizes the playback error of the audio.

Claims (3)

A first step of detecting version information of the compact disc from the information list of the compact disc; A second step of confirming the presence or absence of reproduction order information when the detected version information is a specific value; And a third step of verifying the detected version information according to whether or not the playback order information is present. A first step of confirming that, when playing a moving picture of a video compact disc, the current playback position coincides with the position of previously detected high-quality data (cd-da); A second step of reading a value of a specific position of reproduction control information corresponding to the high quality data when the two positions coincide; Verifying whether the read value is a predetermined value and verifying the existence of high quality data; And a fourth step of switching the audio mode to the high-quality playback mode according to the verification result. 3. The method of claim 2, wherein the specific position is the sixth bit of the sub-Q data string, and the predetermined value is zero.

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