KR100295824B1 - Method for controlling compact disk play - Google Patents

Abstract

PURPOSE: A method for controlling compact disk driving is provided to automatically control the suspension of music playback or the suspension of a moving picture by detecting the occurrence of troubles using time information or interrupt information and playing back a disk after skipping over an unreadable part. CONSTITUTION: A method for controlling compact disk driving comprises the steps of continuously detecting the regeneration of a CD(Compact Disk)(S101), detecting the time information indicating the regeneration progress time of the CD(S102), firstly deciding the occurrence of troubles in the regeneration of the CD by comparing the former time information to the time information detected after specific time(S105), finally deciding the occurrence of troubles in the regeneration of the CD depending on the generation of a decoding interrupt signal output from an MPEG(Moving Picture Expert Group) when the occurrence of troubles is decided, and returning to the first trouble detecting step after skipping over the unreadable part(S106).

Description

Method for controlling compact disk play

The present invention relates to a compact disc such as a compact disc player (COMPACT DISK PLAYER: CDP), a digital video disc player (DIGITAL VIDEO DISK PLAYER: DVDP), or a digital video disc (DIGITAL VIDEO DISK) (hereinafter referred to as a compact disc). And a digital video disc, collectively referred to as a CD), which relates to a CD drive device that reads an audio signal or a video / audio signal. The abnormal state in which the attached and stored data cannot be read is detected by time information or interrupt information, and the unreadable portion is skipped, thereby automatically freezing the screen or stopping the music playback. It is to solve it.

Generally, the CDP includes: an optical system for picking up reflected light by projecting a laser to a predetermined position of the CD; A motor drive system for controlling driving of the motor for rotating the CD; A signal system for analyzing signals detected by the optical system; It consists of a control program, an operating system for performing each curved tack operation and display instructions.

Here, the optical system includes: a focus servo that always fits its reflection surface even if the CD vibrates; A tracking servo for tracking a predetermined track; An optical system sending servo for moving the entire optical pickup in a radial direction; It consists of APC (AUTOMATIC POWER CONTROL) etc. which maintains the oscillation output of a laser diode or the laser reflection light quantity in CD.

In addition, the motor drive system includes a spindle motor for rotating the CD; An optical system sending motor for moving the optical pickup; In the case of horizontal loading type, it consists of a loading motor that slides a CD tray. At this time, the motor drive servo circuit for controlling the spindle motor includes a synchronization signal read from a record to drive CD at CLV (linear speed constant), address information of a trace position, and a clock signal as a reference for a control operation. And various information such as a command signal from a microcomputer.

In addition, the optical pickup signal of the signal system becomes bright on the flat surface of the reflected light, and converts to a high frequency analog signal type for the presence or absence of the pit, and reproduces and separates the stored sound (music signal), and then the D / A converter ( Output through the analog-to-digital converter).

In addition, the operation system is composed of a microcomputer.

1 is a diagram showing an example of a CDP configuration.

On the other hand, the signals recorded on the CD are largely divided into three areas such as a lead in area, a program area, and a lead out area.

The lead-in area is an area in which the number of songs recorded on the CD, the time and total time of each song, the address of the first part and the index part of each song, and the like are recorded. The program area is an area in which audio signals are recorded. .

The lead-out area is an area for indicating the end of the program.

The CDP detects a signal recorded on the CD through an optical system and a signal system, and outputs music through a speaker.

DVDP, as shown in Figure 2, the central processing unit (1) for controlling the overall operation to reproduce the digital information recorded on the CD to output as a video / audio signal; A tracking operation unit (2) which reads the CD information through a pickup device to generate a servo signal, and transfers the pickup device in accordance with the servo signal; An RF signal generation section (3) for detecting a servo error and generating an RF signal with the information obtained from the pickup device; A servo processor (4) for controlling the tracking operation unit (1) according to the servo error detected by the RF signal generation unit (3); A waveform equalizer (5) for receiving the RF signal generated by the RF signal generator (3) to reduce interference between codes and reproducing clock and data synchronized with the RF signal; The clock generated by the waveform equalizer 5 is used to control the motor to maintain a constant linear speed, demodulate the data, correct the error, de-interleave (DE-INTERLEAVE), and descramble (DE) the demodulated data. A data processor 6 which performs SCRAMBLE); An MPEG decoder unit 7 converts a signal from an MPEG (MOVING PICTURE EXPERT GROUP) device applied by the data processor 6 into a video / audio signal, and outputs the video and audio signals recorded on the CD. Play it.

However, in the conventional CD drive apparatus as described above, when a scratch occurs on the surface of the CD, or when a CD is damaged due to adhesion of foreign matter or the like, or when a radial error occurs, the recorded data cannot be read and playback is stopped. There was a problem.

That is, when no further data can be read due to scratches, foreign objects, radial errors, etc., the CD rotation is stopped or a circumference of replaying the same part occurs, thereby preventing normal operation.

An object of the present invention is to solve the above conventional problems, in particular, if the CD surface is scratched, foreign matter, etc. attached to the CD damaged, or due to a radial error it is impossible to read the stored data In this case, a "compact disk" capable of automatically eliminating a screen stop state or a music playback stop state by detecting occurrence of the abnormal state with time information or interrupt information, and skipping an unreadable portion and then performing playback. Drive control method ".

The first embodiment of the "compact disk drive control method" according to the present invention for achieving the above object,

Continuously detecting whether the CD is to be reproduced, and detecting and storing time information indicating a reproduction progress time of the CD when the CD is started;

Detecting the time information after a predetermined time elapses and determining whether there is an abnormality in the CD play operation when the CD play is started and the time information is stored, and compared with the time information detected in the previous step;

If it is determined that an abnormality has occurred in the CD reproducing operation, skipping to the next information area and then returning to the step of determining the operation state.

The determining of the abnormality of the CD playback operation may include comparing time information before and after a predetermined time elapses, and when the time information changes, it is determined that the CD playback operation is normal, and the time information does not change. In this case, it is determined that an abnormality has occurred in the CD playback operation.

On the other hand, the second embodiment of the "compact disk drive control method" according to the present invention,

Continuously detecting whether the CD is to be reproduced, and detecting and storing time information indicating a reproduction progress time of the CD when the CD is started;

Detecting the time information after a predetermined time elapses when the CD play is started and storing the time information, and primarily determining whether there is an abnormality of the CD play operation by comparing with the time information detected in the previous step;

If it is determined that an abnormality occurs in the CD reproducing operation, determining whether or not the CD reproducing operation is abnormal based on whether a decoding interrupt signal output from the MPEG device is generated;

As a result of the final determination, if it is finally determined that an abnormality has occurred in the CD reproducing operation, skipping to the next information area and then returning to the step of primarily determining the reproducing operation state.

In the above, the decoding interrupt signal is detected, and when the decoding interrupt signal is detected, the CD playback operation is determined to be normal, and when the decoding interrupt signal is not detected, the CD playback operation is determined to be abnormal. do.

1 is a configuration diagram schematically showing the configuration of a compact disc player;

2 is a configuration diagram schematically showing the configuration of a digital video disc player;

3 is a control flow diagram showing an embodiment of the "compact disk drive control method" of the present invention;

4 is a control flow diagram showing another embodiment of the "compact disk drive control method" of the present invention.

<Explanation of symbols for the main parts of the drawings>

1 ..... Central Processing Unit

4 ..... Servo processing unit

6 ..... Data Processing Section

7 ..... MPEG Decoder

Hereinafter, a preferred embodiment of the present invention according to the technical spirit made as described above are as follows.

Example 1

Embodiment 1 is to detect whether an abnormal operation of a CD reproduction operation is detected from time information output during CD reproduction in a CDP or a DVDP, and to solve the abnormal operation.

First, when power is applied to the CDP or DVDP, as shown in FIG. 3, the microcomputer of the CDP or the central processing unit of the DVDP continuously detects whether CD playback has started. At this time, if it is determined that CD playback has started (S101), in step S102, time information indicating the playback time of the video signal or audio signal is detected and stored in a temporary buffer.

Next, in step S103, the controller waits for a predetermined time to elapse, and when the predetermined time elapses, time information is redetected in step S104 and stored in another temporary buffer.

In step S105, the time information stored in step S102 is compared with the time information detected and stored in step S104.

If there is no change in the time information as a result of this comparison, it is determined in step S106 that an abnormality has occurred in the CD reproducing operation, skipping to the next information area, and then CD reproducing is performed, and the flow advances to step S103.

That is, when CD playback starts, time information is detected and stored. After a predetermined time has elapsed, time information is redetected and compared with previously stored time information.

As a result, if there is no change in the time information, it is determined that an abnormality has occurred in the CD playback operation.

In this case, when the time information does not change for a predetermined time, the CD playback operation is stopped due to scratches, foreign matter adhesion, radial errors, and the like.

In other words, when the CD is operating normally, time information indicating the reproduction time is read out together with reading recorded data, and as a result, time information indicating the reproduction time is continuously updated.

Next, as a result of searching for the time information change, if the time information has changed, it is checked at step S107 whether CD playback has ended, and as a result, the process proceeds to step S103 described above.

In other words, when the CD playback operation is stopped, the user manually inputs a redo command of the playback operation. However, the present invention skips to the next information area when the time information does not change for a predetermined time. Automatically execute a redo command afterwards.

<Example 2>

The second embodiment is to detect whether or not an abnormal operation of the CD reproduction operation is performed by using time information and a decoding interrupt signal outputted during CD reproduction in the DVDP.

That is, by using the time information and the decoding interrupt signal as a criterion for determining whether the abnormal operation is performed, the reliability of the abnormal operation determination is improved.

First, when power is applied to the DVDP, as shown in Fig. 4, in step S201, the central processing unit of the DVDP continuously detects whether CD playback starts. At this time, if it is determined that CD playback has started, in step S202, time information indicating the playback time of the video signal or audio signal is detected and stored in the temporary buffer.

Next, in step S203, it waits for a predetermined time to elapse, and when the predetermined time elapses, time information is detected again in step S204 and stored in another temporary buffer.

In step S205, the time information detected and stored in step S202 and the time information detected and stored in step S204 are compared. As a result, if there is a change in time information, it is determined that the CD playback operation is normally performed. Go to S209.

On the contrary, as a result of the comparison of step S205, if there is no change in the time information, it is determined that an abnormality has occurred in the CD playback operation, and the decoding output from the MPEG apparatus in step S206 in order to more clearly determine the abnormality of the CD playback operation. Detects the occurrence of interrupt signal.

In step S207, it is checked whether the decoding interrupt signal is generated in the MPEG apparatus. As a result, when the decoding interrupt signal is generated in the MPEG apparatus, it is determined that the CD playback operation is normal, and the flow proceeds to step S209.

On the contrary, when the decoding interrupt signal is not generated in the MPEG device, it is determined that the CD playback operation is abnormal when the decoding interrupt signal is not finally detected in step S208.

This is because the decoding interrupt signal is continuously generated in the MPEG device when the CD reproducing operation is normal, otherwise the decoding interrupt signal is not generated.

If it is finally determined that an abnormality has occurred in the CD playback operation, control is made to skip to the next information area, and then CD playback is resumed from the next information area, and the flow proceeds to step S203.

In addition, in step S209, it is checked whether CD playback has ended, and as a result, when CD playback is not finished, the process moves to step S203. Otherwise, when CD playback ends, the control operation of the present invention ends. do.

That is, in the second embodiment of the present invention, by determining whether the CD playback operation is abnormal or not by detecting whether the time information is changed or whether or not a decoding interrupt signal is generated, the reliability of the CD playback operation abnormality detection is improved.

As described above, the "compact disk drive control method" of the present invention continuously detects the time information generated during CD playback or the decoding interrupt signal generated when decoding the compressed information in the MPEG apparatus, and the time information does not change. If not, or if the time information does not change and the decoding interrupt signal does not occur, it is determined to be an abnormal operation state, and if it is determined to be abnormal, the screen is skipped to another information area and the information recorded on the CD is successively reproduced. There is an effect that can automatically cancel the state, or stop music playback.

Claims (3)

Continuously detecting whether the CD is to be reproduced, and detecting and storing time information indicating the reproduction progress time of the CD when the CD is started as a result of the detection; Detecting the time information after a predetermined time elapses when the CD play is started and storing the time information, and primarily determining whether there is an abnormality in the CD play operation by comparing with the time information detected in the previous step; If it is determined that an abnormality has occurred in the CD reproducing operation, determining whether or not the CD reproducing operation is abnormal by generating a decoding interrupt signal output from the MPEG device; And if it is finally determined that an abnormality has occurred in the CD reproducing operation, skipping to the next information area and then returning to the step of primarily determining the reproducing operation state. Control method. The method of claim 1, wherein the determining of abnormality of the CD playback operation comprises: comparing the time information before and after a predetermined time elapses, and determining that the CD playback operation is normal when time information changes. And determining that an abnormality has occurred in the CD playback operation when the time information has not changed. The method of claim 1, wherein the determining of abnormality of the CD playback operation comprises: detecting the decoding interrupt signal, determining that the CD playback operation is normal when the decoding interrupt signal is detected, and decoding decoding signal. If is not detected, it is determined that an abnormality has occurred in the CD playback operation.

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