KR19980058797A - How to compensate for malfunction of car CD player - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compact disc player (CD) mounted on a moving object such as an automobile, and more particularly, to a method of compensating for malfunction of a car CD player, which compensates for malfunctions such as disc damage or external impact.

To this end, the present invention provides a malfunction compensation method of a car CD player which compensates for a malfunction of a CD by using a reproduction time of a sub cue (Q) code in each track. A reproduction time detection step of detecting a current reproduction time, a previous reproduction time and a maximum reproduction time of the CD from the code; A malfunction state detection step of detecting a malfunction of the CD by comparing the playback time of the CD detected in the playback time detection step; And a malfunction compensation step of forcibly jumping and reproducing the CD if the malfunction state detection result is damage to the disk and returning and reproducing the CD to a previous time if the malfunction state detection result is an external impact.

Description

How to compensate for malfunction of car CD player

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compact disc player (CD) mounted on a moving object such as an automobile, and more particularly, to a method of compensating for malfunction of a car CD player, which compensates for malfunctions such as disc damage or external impact.

Computer and communication technologies are developing remarkably toward the 21st century information society. Accordingly, the amount of information such as voice, code information, images, document information is increasing at a tremendous speed, and it is urgent to develop a device and media capable of effectively storing and processing it quickly.

As such an information recording medium, magnetic tapes and magnetic disks to which magnetic recording has been applied have been mainly applied, but as the information has exploded, new high density recording media capable of storing as much information per unit area as possible have been needed.

With the recent development of optical technologies such as lasers, optical recording technology has been realized, and optical discs have been in the spotlight as a new mass information storage medium.

One such large-capacity information storage medium, the CD player has almost no irregular playback and modulation noise, wide and flat frequency characteristics, no ghost, wide dynamic range, almost no crosstalk, and random access. The user can easily listen to the desired song in high quality.

However, in an automobile equipped with such a CD player, when an external shock occurs or damage is caused to the CD itself, there is a problem that the playback sound does not continue continuously and is broken.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and an object of the present invention is to provide an automobile CD for compensating for the occurrence of a break in the CD player of the vehicle due to an external shock or a disc damage. The present invention provides a method for compensating a player's malfunction.

A feature of the present invention for achieving the above object is a malfunction compensation method of a car CD player which compensates for a malfunction of a CD by using a reproduction time of a sub cue (Q) code in each track, and when the CD is played, A playback time detecting step of detecting a current playing time, a previous playing time and a maximum playing time of said CD from said sub cue (Q) code of said track; A malfunction state detection step of detecting a malfunction of the CD by comparing the playback time of the CD detected in the playback time detection step; And if the malfunction state detection result is a disk damage, forcibly jumping and playing the CD. If the malfunction state detection result is an external shock, a malfunction compensation step of returning and playing the CD to the previous time is included.

The above objects and various advantages of the present invention will become more apparent from the preferred embodiments of the invention described below with reference to the accompanying drawings by those skilled in the art.

1 is a block diagram showing the configuration of a malfunction compensation device of a car CD player according to a preferred embodiment of the present invention

2 is a flowchart for performing a malfunction compensation method of a car CD player according to the present invention.

<Description of the code | symbol about the principal part of drawing>

11: optical pickup unit 12 RF / servo signal processing unit

13: Actuator / Motor Drive Part 14: Disk Motor

100 CD player 110 CD deck

120: digital signal processing unit 130: a (D / A) conversion unit

140: audio signal processing unit 150: key input unit

160: Micom 170: Speaker

200: disk

Hereinafter, with reference to the accompanying drawings will be described in detail the operation of the preferred embodiment according to the present invention.

1 is a block diagram showing the configuration of an apparatus for compensating for malfunction of an automobile CD player according to the present invention. The optical pickup unit 11, the RF / servo signal processor 12, the actuator / motor driver 13, and the disc motor 14 CD deck unit 110, a digital signal processing unit 120, D / A conversion unit 130 composed of. The audio signal processor 140, the key input unit 150, the microcomputer 160, and the speaker 170 are configured.

The key input unit 150 is composed of key metrics and provides a key signal pressed by the user to the microcomputer 160, that is, provides a key signal corresponding to the CD playback mode to the microcomputer 160.

In this case, when the key signal corresponding to the playback mode is provided from the key input unit 150, the microcomputer 160 controls the CD deck unit 110 so that the CD player 100 is in the playback mode.

That is, the CD deck unit 110 reproduces the voice information of the disk 200 by laser light, and typically, as shown in FIG. 1, the optical pickup unit 11 and the RF (Radio Frequency) amplifier / servo signal processing unit. 12, an actuator / motor drive unit 13, a disc motor 14, and the like.

At this time, the optical pickup unit 11 optically picks up the signal recorded on the CD and provides it to the RF amplifier / servo signal processing unit 12, and the RF amplifier / servo signal processing unit 12 is detected by the optical pickup unit 11. After amplifying the signals of the disc, the tracking and focus control signals are transmitted to the actuator / motor driver 13 and the microcomputer 160 so that the optical pickup unit 11 can accurately read the signals of the optical disc. to provide.

In addition, the microcomputer 160 supplies a control signal for driving the system of the optical disc in response to the servo control signal provided from the RF / servo signal processing unit 12 and the reproduction mode key signal provided from the key input unit 150. It applies to the motor drive part 13.

Accordingly, the actuator / motor driver 13 drives the disk motor 14 according to the servo control signals provided from the microcomputer 160 and the RF amplifier / servo signal processing unit 12 so that the optical pickup unit 11 may include a disk ( It is possible to accurately read the signal recorded in 200).

On the other hand, the digital signal processor 120 demodulates the voice signal reproduced by the CD deck unit 110, that is, the optical pickup signal under the control of the microcomputer 160, and detects a frame synchronization signal, detects an error, or detects an error. After the correction is made, the voice information is provided to the D / A (Analog) conversion unit 130, and submicron (Q) code data recorded at 75 ms every 17 msec of the track is detected and transferred to the microcomputer 150. to provide.

At this time, the microcomputer 160 detects a malfunction state by detecting and comparing the current playback time, the maximum playback time, and the previous playback time from the sub cue (Q) code data provided by the digital signal processor 120.

At this time, the microcomputer 160 compensates for the disk damage by jumping from the currently playing track if the malfunction state is a disk damage, and controls the CD deck unit 110 to play back the previous playback time if the malfunction state is caused by an external impact. do.

Therefore, the CD deck unit 110 is driven under the control of the microcomputer 160 to reproduce the audio information recorded on the disk 200.

Meanwhile, as described above, the D / A converter 130 converts the digital voice information provided from the digital signal processor 120 into an analog signal and provides the analog signal to the audio signal processor 140, and the audio signal processor 140 The analog voice signal is processed as an audio signal and provided to the speaker 170.

FIG. 2 is a flowchart illustrating a malfunction compensation method of an automobile CD according to the present invention, which will be described in detail with reference to the block diagram shown in FIG. 1.

The microcomputer 160 determines whether the CD deck unit 110 is in the playback mode in step 200. That is, if the CD deck unit 110 is driven in the playback mode, the microcomputer 160 proceeds to step 201. (Q) The current reproduction time, the maximum reproduction time and the previous reproduction time are detected from the code data.

In this case, the microcomputer 160 proceeds to step 202 and compares the current playback time with the maximum playback time of the CD detected in step 201.

In other words, if the current playback time is greater than or equal to the maximum playback time, it is determined that it is a normal playback mode, and the process proceeds to step 203 to set the current playback time as the maximum playback time. The process proceeds to step 205 to set the current playback time to the previous time.

On the other hand, if the current playback time is less than the maximum playback time in step 202, the microcomputer 160 determines that it is a malfunction and proceeds to step 206 to compare the current playback time with the previous playback time.

That is, if the current reproduction time is less than or equal to the previous reproduction time, the reproduction is performed in a direction opposite to the reproduction direction, and the flow proceeds to step 207 to detect the number of times of return from the current reproduction time to the previous reproduction time.

In this case, the microcomputer 160 proceeds to step 208 and determines whether the number of return times from the current playback time to the previous playback time is greater than or equal to a preset number.

That is, if the number of return from the current play time to the previous play time is more than the preset number, the microcomputer 160 determines that the disc itself is damaged and plays a forced jump, and returns the count from the current play time to the previous play time. If is less than the predetermined number of times is determined to be a temporary phenomenon due to an external impact, return to the previous playback time to play.

As described above, the malfunctioning method of the car CD player according to the present invention compares the current playback time and the maximum playback time detected from the sub-Q code data of the CD to be reproduced. The current playback time is compared with the previous playback time, and if the current playback time is less than or equal to the previous playback time, the number of times of return from the current playback time to the previous playback time is detected. If playback is forcibly jumped and the detected recovery count is less than or equal to the preset recovery count, the playback is restored to the previous playback time, thereby making it possible to compensate for a malfunction.

Claims (2)

A malfunction compensation method of a car CD player which compensates for a malfunction of a CD by using a reproduction time of a sub cue (Q) code in each track, A reproduction time detection step of detecting a current reproduction time, a previous reproduction time and a maximum reproduction time of the CD from the sub cue (Q) code of a track to be reproduced when the CD is reproduced; A malfunction state detection step of detecting a malfunction of the CD by comparing the playback time of the CD detected in the playback time detection step; Compensation for malfunction of the video cassette recorder, comprising: compensating for jumping the CD by forcibly jumping if the malfunction state detection result is damaged, and reproducing and replaying the CD to the previous time if the malfunction state detection result is external impact Way. The method of claim 1, wherein the detecting of the malfunction comprises: a time comparison step of comparing the current reproduction time with the previous reproduction time if the detected maximum reproduction time is equal to or greater than the current reproduction time; A return count detection step of detecting a return count from the current playback time to the previous playback time if the previous playback time is greater than or equal to the current playback time as a result of the time comparison step; A malfunction detection step of detecting a malfunction corresponding to the disk damage if the detected number of recovery times is equal to or greater than a predetermined number of times; Method for compensating for malfunction of a video cassette recorder comprising a.