KR19980023508A - How to Force Play of Video C.D Player - Google Patents

Abstract

The present invention relates to a forced playback method of a video compact disc player. (A) After reading a table of content (TOC) data when a disc is loaded, if the TOC data is not read, the playback mode is set to a forced playback mode. Transferring the pickup to the innermost circumference, determining whether (c) the data recorded on the disc is read, (d) if the data is not read, transferring the pickup by a predetermined amount, and then returning to (c) Determining whether the area from which data is read is a lead-in area when data is read; and (e) if the area from which data is read is a lead-in area, lead-out. Determining whether the area is an area; (f) if the area from which data is read is a lead-out area, stopping driving, otherwise transferring the pickup by a predetermined distance, and then returning to step (c); Read data A region between a lead-in when the read-in area is then transferred to pick-up data into the data area data is read out is more than a predetermined time from the position comprising the step of sequentially executing the forced recovery and configuration.

Therefore, the present invention has the advantage that a disc whose TOC data is damaged due to poor production or scratching of the disc due to misuse in use can be forcibly reproduced.

Description

How to Force Play of Video C.D Player

The present invention relates to a video compact disc player, and more particularly, to a forced playback method of a video compact disc player capable of reproducing a video compact disc having bad disc content information.

As a general optical disk player, a compact disk player, a laser disk player and a compact disk graphic player, a video compact disk player (hereinafter referred to as video) The compact disc player is a device that can play audio only, and the laser disc player, compact disc graphic player and video CD player can play video and audio simultaneously. It is a device that can.

Recently, digital video disks (DVDs) using MPEG-2 moving picture compression technology have been developed, which have a gigabytes (GB) capacity including moving pictures in a 12 cm optical disc such as a current CD. Data can be recorded and reproduced, and there is a continuing trend to improve its performance.

On the other hand, such optical disc reproducing apparatuses reproduce images and / or audio recorded on optical discs and output them through a screen and / or a speaker, and have a higher signal-to-noise ratio than conventional image and / or audio reproducing apparatus. It is possible to reproduce signals with image quality and / or sound quality, to generate noise due to irregular reproduction and modulation, to minimize distortion, to avoid ghosts, and to access randomly. There is a trend that is widespread.

Among these optical disc reproducing apparatuses, the video CD player is most widely used among optical disc reproducing apparatuses for simultaneously reproducing audio and video data.

However, in order to play back video and audio data reproduced on a disc in a video CD player, first read and store disc content information (TOC) recorded in the lead-in area, which is the innermost region of the disc. And refer to it.

In other words, the TOC data is read to recognize content information on the actual data recorded on the disc in advance, and the reproduction is sequentially performed at a desired position or from the first track with reference to this.

On the other hand, such discs played on the Video CD player, that is, Video CD are being produced early for various contents and purposes with the spread of the Video CD player. Due to problems, the occurrence of bad disks is also increasing. In addition, the use of video CDs may cause scratches or the like on the disk surface due to careless use.

In the case of the above-mentioned bad disk and in the case of the damaged disk, if the damaged area is another area, there is no big problem in playing. However, if the damaged area is the TOC area, the video CD player performs all functions. Playback cannot be performed because the referenced TOC data cannot be read.

Accordingly, the present invention has been proposed in view of the above-mentioned point, and an object of the present invention is to provide a forced playback method of a video CD player, which is capable of forcibly executing playback on a disk whose TOC data is damaged.

According to a preferred embodiment of the present invention for achieving the above object, in the forced playback method of a video compact disc for playing a disc with damaged table of content (TOC) data, (a) when the disc is loaded, Setting the playback mode to the forced playback mode if the TOC data is not read after executing the reading of the TOC data, and transferring the pickup for reading data from the disk to the innermost circumference; (c) the pickup Determining whether the data is read by performing a pickup of the data recorded on the disc, and (d) if the data is not read in the step (c), transferring the pickup by a predetermined amount and then (c) step. When the data is read in step (c), the area where data is read with reference to the data is a lead-in area. And (e) if the area from which data is read in step (d) is not the lead-in area, whether the area is a lead-out area that is the outermost peripheral area of the disc. And (f) stopping the driving if the area in which the data is read in the step (e) is the lead-out area and transferring the pickup by a predetermined distance if the area is not the lead-out area. Returning to the step; and (g) if the area from which data is read in step (d) is the lead-in area, transfer the pickup to the data area and then read the data to read the data for a predetermined time or more. Starting the forced playback sequentially.

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

2 is a detailed flowchart of a forced playback method of a video CD player according to a preferred embodiment of the present invention.

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

10: Pickup and Actuator

20: RF amplifier and servo signal processing unit

30: motor drive unit 40: key input unit

50: microcomputer 60: digital signal processing unit

70: MPEG decoder 80: video signal processing unit

90: audio signal processing unit 100: screen

110: speaker D: disk

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, a video CD player for carrying out the present invention includes a pickup and actuator unit 10, an RF (radio frequency) amplifier and a servo signal processor 20, a motor driver 30, and a key input unit ( 40, the microcomputer 50, the digital signal processor 60, the MPEG decoder 70, the video signal processor 80, the audio signal processor 90, the screen 100, and the speaker 110.

The pickup and actuator section 10 executes optical pickup from the disk D loaded in the disk tray (not shown), and outputs an RF signal read out 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 receive the RF. Output as a signal.

The RF amplifier and servo signal processing unit 20 amplifies the 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 made.

The digital signal processor 60 digitally processes the amplified RF signals provided from the RF amplifier and the servo signal processor 20 and performs error detection and error correction, and then outputs them 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 80 and the audio signal processor 90. .

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

On the other hand, according to the present invention, when the disc is loaded in the disc tray, the optical pickup unit 10 reads out the recorded TOC data which is the lead-in area from the disc D, and then through the RF amplifier and the servo signal processing unit 20. Provided at 50.

Accordingly, the microcomputer 50 stores the TOC data read out from the optical pickup unit 10 and provided in the built-in memory (not shown). If it is detected that the TOC data is not completely provided, all the TOC data is stored. If is not completely read, normal regeneration is impossible, so the control signal is generated to set the mode to the forced regeneration mode, and the control signal is generated by the motor and the motor driver 30 to drive the slad motor (not shown) to pick up the optical The pickup constituting the section 10 is transferred to the innermost circumference of the disk D (the beginning of the lead-in area) and then the pickup is fixed.

And, accordingly, the optical pickup unit 10 performs the optical pickup in the position where the pickup is fixed, and provides the read data to the microcomputer 50 through the RF amplifier and the servo signal processing unit 20, in which the microcomputer 50 Determines whether or not data is provided from the optical pickup section 10. Therefore, if normal data is provided from the optical pickup section 10 to the microcomputer 50, the microcomputer 50 will recognize that the data is being read, otherwise the data will not be read.

When the normal data is provided from the optical pickup unit 10, the microcomputer 50 determines whether the current pickup area is the lead-in area by referring to the contents of the data, and if the lead-in area is a lead-in area, The pickup is transported to the data area where audio data is recorded, and then, when data is normally read for a predetermined time or more, a reproduction control signal is generated so that forced reproduction is executed without referring to TOC data sequentially from that position.

In addition, when the data is not read at the fixed position of the pickup, the microcomputer 50 generates a control signal to the motor and the motor driving unit 30, transfers the pickup by a predetermined amount, and then fixes the pickup again. The process of reading the data and detecting the position of the pickup as described above is repeated, and if the position where the data is read is not the lead-in area or the lead-out area existing on the outermost periphery of the disc, normal data is obtained. Detects a data area to be read for a predetermined time or more, and if this area is detected, the forced reproduction is executed without referring to the TOC data sequentially from that position as described above.

On the other hand, if it is detected that the current pickup position is a lead-out area, the microcomputer 50 stops driving the video CD player.

2 is a detailed flowchart of a forced playback method of a video CD player according to a preferred embodiment of the present invention.

When the disc is loaded in step S10, reading of the TOC data is executed in step S20, and in step S30 it is determined whether all the TOC data recorded in the lead-in area is completely read out. When TOC data is read completely in step S30, normal playback is performed with reference to the TOC data read in step S160 and step S170.

On the other hand, if the TOC data is not normally read in step S30 and proceeds to step S40, in step S40 the mode of the video CD player is set to the forced playback mode and the step proceeds to step S50.

Thereafter, in step S50, the pickup is transferred to the innermost circumference of the disc D. In step S60, the transferred pickup is fixed, and in step S70, optical pickup is executed to read data and step S80. ) Determines whether the read data is read. If data is read out in step S80, the flow advances to step S100, otherwise the flow proceeds to step S90.

First, when the process proceeds from the step S80 to the step S90, the step S90 transfers the pickup to the outer circumference of the disc by a predetermined distance, and the step S90 returns to the step S60 to perform the flow again. .

In addition, when the process proceeds from step S80 to step S100, in step S100, it is determined whether the area of the disc from which the current data is read is the lead-in area by referring to the data to be read. In step S100, the flow proceeds to step S130, which is determined as the lead-in area. Otherwise, the flow advances to step S110.

When the process proceeds from step S100 to step S110, in step S110, it is determined whether the area where data is read out is the lead-out area, which is the outermost area of the disc. Proceeding to step S120, in step S120, driving of the video CD player is stopped. In step S110, if it is not the lead-out area, the process returns to step S140 to perform forced reproduction.

On the other hand, if the process proceeds from step S100 to step S130, in step S130 the pickup is transferred to a data area in which substantial audio and video data is recorded and then data is read.

In step S140, it is determined whether the data read in step S130 is continuously read for a predetermined time or more. If the data is not continuously read for a predetermined time in step S140, the flow returns to step S90 to flow. If the data is continuously read for a predetermined time, the flow advances to step S150 to sequentially execute forced reproduction without referring to the TOC data from that position.

As described above, the present invention has the advantage that a disc whose TOC data is damaged due to defective production or scratching of the disc due to misuse in use can be forcibly reproduced.

Claims (1)

A method of forcibly playing a video compact disc for playing a disc whose table of content (TOC) data is damaged, (A) After reading the TOC data when the disc is loaded, if the TOC data is not read, set the playback mode to the forced playback mode, and transfer a pickup for reading data from the disc to the innermost circumference of the disc. Steps; (C) fixing the pickup and executing pickup of data recorded on the disc to determine whether data is read; (D) If data is not read in step (c), transfer the pickup by a predetermined amount and then return to step (c). If data is read in step (c), read the data with reference to the data. Determining whether the dispatched area is a lead-in area; (E) determining whether the area from which data is read in step (d) is the lead-out area if the area is not the lead-in area; (F) If the area in which the data is read in the step (e) is the lead-out area, driving stops, and if the area is not the lead-out area, the pickup is transported by a predetermined distance and then returned to the step (c). Steps; (G) If the area from which data is read in step (d) is the lead-in area, the pickup is transferred to the data area, the data is read out, and if data is read for more than a predetermined time, forced reproduction is sequentially performed from the position. Force playback method of a video compact disc player comprising the step of.