KR19980030580A - How to Navigate the CD Track of a Video Compact Disc Player - Google Patents

Abstract

The present invention relates to a CDDA track search method of a video compact disc player.

To this end, the present invention reads the Entries Used data recorded in the 11th and 12th bytes of the ENTRIES.VCD file and detects the number of entries used, that is, the number of MPEGAV tracks recorded on the disc and uses the maximum. The MPEGAV track number is detected, and the maximum MPEGAV track number detected and the track number being searched are compared by performing the back search from the outermost track of the disc, and the track is reproduced for a predetermined time when it is determined to be a CDDA track.

Therefore, the present invention has the effect of searching and detecting a CDDA track recorded after an MPEGAV track in a video compact disc, and reproducing the detected CDDA track for a predetermined time.

Description

How to Navigate the CD Track of a Video Compact Disc Player

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video compact disc player, and more particularly, to a CD compact disc for detecting and detecting a CDD track in which audio data is recorded only on a version 2.0 disc of a video compact disc. D. A track search method.

With the development of audio and video media, optical disc players for recording and reproducing video and audio data on semi-permanent optical discs have been developed.

Such an optical disc player reproduces an image and / or audio recorded on an optical disc and outputs it through a screen and / or a speaker, and has a higher signal-to-noise ratio than conventional image and / or audio reproducing apparatus, resulting in better image quality and / or Or it can reproduce signals with sound quality, generate no noise due to irregular reproduction and modulation, very low distortion, no ghost, random access, etc. There is a trend.

In addition, such an optical disk player includes a compact disk player (CDP), a laser disk player (LDP), a compact disk graphic player (CDGP), and a video compact disk player (VCDP: video compact disk player, hereinafter abbreviated as video CD player) has been developed and widely used. Also, recently, a digital video disk (DVD) using MPEG-2 moving picture compression technology and playback thereof are used. A digital video disc player has been developed, which can record and play back gigabytes (GB) of data including moving images in a 12 cm optical disc such as a current CD, and can also play current CDs and VCDs. It is designed to be compatible.

On the other hand, there are two types of discs used in the video CD player, version 1.1 and version 2.0, and the dual version 2.0 disc has audio as well as a general MPEGAV track in which video data and audio data are simultaneously recorded. CDDA tracks in which only data is recorded may exist as one or more tracks in the track following the MPEGAV track in some cases. Conventionally, the presence of such a CDDA track when a video CD player is desired to play a version 2.0 disc. And there was no easy way to detect information about one or more CDDA tracks.

Therefore, the present invention has been proposed based on the above-described point of view, and an object of the present invention is to detect the presence or absence of a CDDA track by searching for a disc loaded in a video CD player, and if present, to search for each CDDA track. It provides a video CD player track navigation method.

According to a preferred embodiment of the present invention for achieving this object, there is provided a CD track search method of a video compact disc player for searching a CDDA track from a loaded disc for playback in a video compact disc player. And (a) read and store the table of content (TOC) data of the loaded disc and the files in the VCD directory, and then refer to the Entries Used data of the ENTRIES.VCD file among the files in the stored VCD directory to determine the last MPEGAV track number. Setting the storage, (b) performing a backward search from the track corresponding to the outermost circumference of the disc, and (c) the current track number being searched is greater than the last MPEGAV track number stored in step (a). Determining whether the number is less than or equal to (d) and (d) the current track number being searched for in (b) is (a). If it is less than or equal to the last MPEGAV track number stored in the system, it saves the time data at the current search position, sets a timer, starts counting, and also causes the MPEG decoder to play an I picture, and sends the played data to the MPEG decoder. Determining whether an I picture is detected for a predetermined time by transmitting; and (e) if an I picture is detected for a predetermined time set in the above step (c), it is determined that the current track is not the CDDA. Determining whether the search track was a CDDA track; and (f) if the previous search track was a CDDA track in step (e), transfer the pickup to the start position of the current search track to read and store sequence header information, and then store the MPEG decoder. After setting, transfer the pickup to the location where the time data is stored in step (d), and then return to step (d). And (g) if the current track number being searched in step (c) is not less than or equal to the last MPEGAV track number stored in step (a), determine the track currently being searched as a CDDA track and select the current track. Transmitting the reproduced data to the MPEG decoder; (h) if the CDG or CDDA data is detected in the step (h), after the reproduction is performed for a predetermined time, the pickup is transported backward by a predetermined distance; And then returning to the step (c).

1 is a schematic block diagram of a typical video compact disc player for practicing the present invention.

2 is a detailed flowchart of a C.D.D.track search method of a video compact disc player according to a preferred embodiment of the present invention.

3 is a diagram showing the structure of an entry VCD file;

* Description of the symbols for the main parts of the drawings *

10: pickup and actuator unit 20: RF signal amplification and servo signal processing unit

30: motor drive unit 40: key input unit

50: microcomputer 60: digital signal processing unit

70: MPEG decoder 80: audio signal processing unit

90: video signal processing unit 100: speaker

110: screen

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

1 is a schematic block diagram of a video CD player for practicing the present invention.

As shown in FIG. 1, an optical disc player for implementing the present invention includes a pickup and actuator unit 10, an RF (radio frequency) signal amplification and servo signal processing unit 20, a motor driver 30, and a key input unit 40. ), A microcomputer 50, a digital signal processor 60, an MPEG decoder 70, an audio signal processor 80, a video signal processor 90, a speaker 100, and a screen 110.

The pickup and actuator unit 10 performs an optical pickup from a disc loaded in a disc tray (not shown) and outputs an RF signal which is read accordingly.

In addition, the motor driving unit 30 drives the spindle motor (not shown) to rotate the disk, and drives the actuator unit 10 so that the pickup unit 10 performs optical pickup to read the data recorded on the disk to RF Output as a signal.

The RF signal amplification and servo signal processing unit 20 amplifies an RF signal provided from the pickup and actuator unit 10 and provides a servo control signal according to the signal to the motor driving unit so that the focus servo and the tracking servo are performed.

The digital signal processing unit 60 digitally processes the amplified RF signal provided from the RF signal amplification and servo signal processing unit 20, performs error detection and error correction, and outputs the result to the MPEG decoder 70.

The MPEG decoder 70 decodes an error corrected digital video signal and an audio signal provided from the digital signal processor 60 based on the MPEG compression format and outputs the decoded video signal to the video signal processor 90 and the audio signal processor 80. .

The audio signal processor 80 and the video signal processor 90 process the decoded audio and video signals provided from the MPEG decoder 70 and output them to the speaker 100 and the screen 110, respectively. ) And the screen 110 are displayed as an audio transmission and an image, respectively.

Meanwhile, according to the present invention, when a predetermined disc is loaded in the disc tray, the microcomputer 50 reads disc contents information (TOC) and files in the VCD directory from the loaded disc, thereby internal memory (not shown). To the 11th and 12th bytes of the ENTRIES.VCD file, that is, the number of entries used by reading the Entries Used data, i.e., on disk. The number of MPEGAV tracks recorded in the program is detected and stored.

In addition, the microcomputer 50 reads the 4-byte data of the last entry by referring to the read Entry Used data, sets the first byte of the first to the maximum MPEGAV track number, and transmits a control signal to the motor driver 30. The MPEG 10 track number in which the pickup unit 10 is transferred to the outermost track (except for the lead-out area) recorded on the disc, and then search backward toward the inner track of the disc to set the number of the track currently being searched. If the number of the track currently being searched is larger than the set maximum MPEGAV track number, the microcomputer 50 determines the track currently being searched as the CDDA track and executes playback for a predetermined time. After generating a control signal to the motor drive unit 30 to drive a feed motor (not shown), the pickup unit 10 is transferred by a predetermined distance and then Belongs to the rear search.

On the other hand, if the number of the track currently being searched is less than or equal to the set maximum MPEGAV track number, the microcomputer 50 stores the time data at the current search position, and then generates a control signal to the MPEG decoder 70 to reproduce the I picture. As a result, the reproduced data is transmitted to the MPEG decoder 70. The microcomputer 50 detects whether there is I picture data among the data transmitted to the MPEG decoder 70 and decoded, that is, whether the I picture is reproduced. If it is determined that the track being searched is not a CDDA track, and the I picture is played back, the microcomputer 50 determines whether the previous search track was a CDDA track and, if it is a CDDA track, moves the pickup unit 10 to the start position of the track currently being searched. Then, the sequence header information is read and stored, and the pickup is transferred to the current position where the time data is stored to detect whether the I picture is reproduced again.

That is, when the CDDA track is detected while performing the backward search from the outermost circumference of the disc, the microcomputer 50 plays for a predetermined time and then transfers the pickup 10 toward the inner track by a predetermined distance to repeat the search. Allows you to browse CDDA tracks.

FIG. 2 is a detailed flowchart of a CDDA track searching method of a video compact disc player according to a preferred embodiment of the present invention. As described above, FIG. 3 is a diagram showing the structure of an ENTRIES.VCD file in a VCD directory.

2 and 3, a CDDA track searching method of a video compact disc player according to a preferred embodiment of the present invention will be described.

First, in step S10, the table of content (TOC) data of the loaded disk and the files in the VCD directory are read, and then the Entries Used data of the ENTRIES.VCD file is read as shown in FIG. 3 among the files in the VCD directory. Save and set the last MPEGAV track number with reference.

When step S10 is completed, in step S12, the rear search is performed from the track corresponding to the outermost circumference except for the lead-out area of the disc.

Then, in step S14, it is determined whether the current track number being searched in step S12 is less than or equal to the last MPEGAV track number stored in step S10, and the current track number being searched in step S14 is stepwise. If it is less than or equal to the last MPEGAV track number stored in S10, the flow goes to step S16, otherwise the flow goes to step S32.

Proceeding from step S14 to step S16, the step S16 stores time data at the current search position, sets a timer and starts counting, and simultaneously causes the MPEG decoder 70 to play back an I picture. The data to be reproduced is transmitted to the MPEG decoder 70. In step S18 and step S20, the MPEG decoder 70 determines whether an I picture is detected for a predetermined time.

In step S18 and step S20, if an I picture is detected for a predetermined time, the process proceeds to step S30 to determine that the current track is not the CDDA, and to step S50. If the I picture is not detected for a predetermined time in steps S18 and S20, the process proceeds to step S22 to determine whether the previous search track was a CDDA track.

In step S22, if the previous search track was a CDDA track, the process proceeds to step S24 to transfer the pickup to the start position of the current search track, and when step S24 is completed, step S26.

Then, in step S26, the sequence header information is read and stored, the MPEG decoder 70 is set, and the flow proceeds to step S28. In step S28, the flow returns to step S16 in which the pickup is transferred to the position where the time data is stored in step S16.

And, in step S14, if the current track number being searched is not less than or equal to the last MPEGAV track number stored in step S10. In step S32, the track currently being searched is determined to be a CDDA track, and in step S34, the track currently being searched is reproduced to transmit the reproduced data to the MPEG decoder.

In step S36, it is determined whether CDG data is detected in the data reproduced in step S34. If CDG data is detected in step S36, the timer is set in step S38 and the count is started. In steps S40 and S42, CDG data is decoded for a predetermined time counted by a timer to substantially reproduce the data.

On the other hand, if CDG data is not detected in step S36, the flow advances to step S44 to set a timer and then plays back CDDA data for a predetermined time in steps S46 and S48.

When the steps S40 and S42 and / or the steps S46 and S48 are completed, the process proceeds to step S50, in which the pickup 10 is transported by a predetermined distance, and then again in step S14. Return to) to search for another CDDA track.

As described above, the present invention has the effect of searching for and detecting a CDDA track recorded after an MPEGAV track in a video CD, and reproducing the detected CDDA track for a predetermined time.

Claims (1)

A method for searching a CDDA track of a video compact disc player for searching a CDDA track from a loaded disc for playback on a video compact disc player, (A) read and store TOC (table of content) data of the loaded disc and files in the VCD directory, and then save the last MPEGAV track number by referring to Entries Used data of the ENTRIES.VCD file among the files in the stored VCD directory. Setting up, (B) performing a rear search from the track corresponding to the outermost circumference of the disc; (C) determining whether the current track number being searched for is less than or equal to the last MPEGAV track number stored in step (a); (D) If the current track number being searched for in step (b) is less than or equal to the last MPEGAV track number stored in step (a), then save the time data at the current search position, set the timer, and then start counting. And reproducing the I picture in the MPEG decoder, and transmitting the reproduced data to the MPEG decoder to determine whether the I picture is detected for a predetermined time; (E) determining that the current track is not the CDDA if an I picture is detected for a predetermined time in step (c); and if not, determining whether the previous search track was a CDDA track; (F) If the previous search track was a CDDA track in step (e), transfer the pickup to the start position of the current search track to read and store sequence header information, set the MPEG decoder, and then time data in step (d). Returning to the step (d) after transferring the pickup to the stored position; (G) If the current track number being searched in step (c) is not less than or equal to the last MPEGAV track number stored in step (a), the track currently being searched is identified as a CDDA track and played by playing the current track. Transmitting data to the MPEG decoder; (H) if CDG or CDDA data is detected in step (g), after performing playback for a predetermined time, transferring the pickup backward by a predetermined distance, and then returning to step (c); How to navigate CDDA tracks on video compact disc players.