KR19980058835A - Disc foreign object detection method of optical disc player - Google Patents

Abstract

The present invention relates to a disk foreign matter detection method of an optical disc player, comprising the steps of: (a) loading a disc, reading and storing table of contents (TOC) data, and then executing playback when a reproduction key signal is input; (B) detecting a C ₂ P ₀ signal occurring within a predetermined time while performing reproduction, and counting the number of detected C ₂ P ₀ signals; (C) A disc that is played when the number of C ₂ P ₀ signals that is counted is greater than the preset number by comparing the number of C ₂ P ₀ signals generated within the predetermined playback time counted in step (b) with the preset reference number. Displaying that there is a foreign substance on the phase; (D) If the number of C ₂ P ₀ signals generated within the predetermined playback time counted in step (b) is compared with the preset reference number, and the number of counted C ₂ P ₀ signals is less than or equal to the preset number ( And b) returning to the step.

Therefore, the present invention has the effect of detecting the foreign matter on the disc when playing the disc, display it and inform the user so that the user can take appropriate measures.

Description

Disc foreign object detection method of optical disc player

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method for detecting an error in reproduction of an optical disc player, and more particularly, to a method for detecting a foreign substance in an optical disc player for detecting and displaying an error caused by a foreign substance on a disc.

With the development of audio and video media, optical disc players have been developed that record and reproduce video and audio data on semi-permanent optical discs.

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 the signal with sound quality, it does not generate noise due to irregular reproduction and modulation, very low distortion, no ghost and random access, so it is rapidly developed and widely distributed. 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) has been developed and widely used. Also, recently, a digital video disk (DVD) using MPEG-2 moving picture compression technology and a digital video disk player for playing the same have been developed. It can record and play back gigabytes (GB) of data including moving images on a 12cm optical disc such as a CD, and it is also designed to be compatible to play current CDs and VCDs.

On the other hand, when playback is performed in such an optical disc player, an error may occur in the playback signal due to external or internal influences, that is, external shock during playback, a defect in the disk, and an error in signal recording, which causes an error signal. In most cases, the optical disc player is configured to be corrected during playback.

In most cases, however, errors caused by external or internal influences can be corrected. However, if there is a foreign substance on the disc, error correction cannot be performed and normal playback cannot be performed. There was a problem that no appropriate measures could be taken.

Accordingly, the present invention has been made to solve such a conventional problem, and an object of the present invention is to detect an error signal generated by a foreign matter attached to a disc during playback, and to recognize that there is a foreign matter on the disc and to use the same. The present invention provides a method for detecting a disk foreign matter in an optical disc player, by informing a user so that the user can take appropriate measures.

According to a preferred embodiment of the present invention for achieving this object, there is provided a method for detecting a foreign substance on a predetermined disk to be played in an optical disk player, comprising: (a) loading a disk and storing table of contents (TOC) data; When the reading is saved after the playback key signal is input in the step of executing playback, (b) said C ₂ P ₀ signal is detected the C ₂ P ₀ signal, and the detection occurring in a predetermined time preset after performing the reproducing Counting the number, and (c) comparing the number of C ₂ P ₀ signals generated within the predetermined playback time counted in step (b) with the preset reference number, and the number of the counted C ₂ P ₀ signals. and the step of the group is greater than the set number display that the foreign matter on the disc is the playback, (d) a C ₂ P ₀ Seen generated in the predetermined reproduction time counted in step (b) A is the total number of the count C ₂ P ₀ signal is less than or equal to said predetermined number as compared with the reference number of a predetermined number comprising the step of returning to step (b), and configuration.

1 is a schematic block diagram of a general optical disc player for practicing the present invention.

2 is a detailed block diagram showing a disk foreign matter detection method of an optical disk player according to a preferred embodiment of the present invention.

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

10: optical pickup section 20: RF signal amplification and servo signal processing section

30: motor and motor drive unit 40: key input unit

50: microcomputer 60: digital signal processing part

70: MPEG decoder 80: Audio signal processor

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 an optical disc player for practicing the present invention.

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

First, the key input unit 40 provides the microcomputer 50 with a function key signal for executing a predetermined function in the optical disk player configured as described above, that is, a function key signal input by a user pressing a predetermined function key. do.

In addition, the microcomputer 50 generates control signals corresponding to the function key signals provided from the key input unit 40 to the respective constituent members so as to execute a predetermined function, for example, a playback function.

On the other hand, when a reproduction key signal is input from the key input unit 40 and a control signal is generated from the microcomputer 50, the motor and the motor driving unit 30 drive a disk loading motor (not shown) to drive a disk tray (not shown). (Not shown) to rotate the disk and drive an actuator portion (not shown) built in the optical pickup section 10 to drive the disk from the optical pickup section 10 (not shown). Perform optical pickup.

That is, the optical pickup unit 10 performs an optical pickup from the loaded disk according to the driving of the motor and the motor driver 30, and accordingly the RF signal read out from the disk to the RF signal amplification and servo signal processing unit 20. Output

The RF signal amplification and servo signal processor 20 amplifies the RF signal provided from the optical pickup unit 10 and provides a servo control signal according to the signal to the motor and the motor driver 30 so that the focus servo and the tracking servo may be To be done.

The digital signal processing unit 60 performs digital signal processing, that is, EFM (eight to fourteen modulation) demodulation, error detection and error correction, etc., on the amplified RF signal provided from the RF signal amplification and servo signal processing unit 20. It then outputs 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 then the video signal processor 90 and the audio signal processor 80. Will be printed respectively.

Accordingly, 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. As a result, the speaker 100 and the screen 110 are respectively transmitted as voice and displayed as an image.

On the other hand, according to the present invention, when the digital signal processor 60 can no longer perform error correction in performing the EFM demodulation and error correction of the RF signal provided from the RF signal amplification and servo signal processor 20, C _{A 2} P ₀ signal is generated by the microcomputer 50.

Accordingly, the microcomputer 50 drives the built-in timer (not shown) to count the number of C ₂ P ₀ signals provided from the digital signal processor 60 for a preset reproduction time, and counts the C ₂ P ₀ signals. If there is a foreign object on the disk when the number of C ₂ P ₀ signals counted is greater than the preset reference number, that is, the minimum number of C ₂ P ₀ signals generated when there is a foreign object on the disk. The data indicating the (which is pre-stored in the internal memory) and the control signal are provided to the video signal processing unit 90.

Then, the video signal processor 90 processes the on-screen display (OSD) of the data provided according to the control signal of the microcomputer 50 to the screen 110, and the screen 110 detects that there is foreign matter on the disk. Display characters that are displayed so that the user can recognize them.

On the other hand, the microcomputer 50 resets the timer when the number of the C ₂ P ₀ signals provided from the digital signal processor 60 during the preset reproduction time is less than or equal to the reference number, and the next preset The process of counting the number of C ₂ P ₀ signals generated during the reproduction time and comparing it with the preset reference number as described above is repeated until the reproduction is completed.

2 is a detailed flowchart illustrating a foreign material detection method of an optical disc player according to a preferred embodiment of the present invention.

In step S10, the disc loaded in the disc tray is loaded, and the table of content (TOC) data indicating the disc content information is read out from the lead-in area and stored in step S20. Playback is performed when a key signal is input.

When playback is performed in step S20, in steps S30 and S40, a preset playback time, that is, a C ₂ P ₀ signal generated during a predetermined predetermined playback period is detected, and the detected C _{2 is} detected. P ₀ Count the number of signals.

Thereafter, the step (S50) In the step (S30) and to compare the number of the detected and the count C ₂ P ₀ signal at step (S40) and a reference a predetermined number, In this case, the number of counts C ₂ P ₀ signal group If it is greater than the set reference number, that is, the minimum number of C ₂ P ₀ signals generated when there is a foreign matter on the disc, the process proceeds to step S60. If the size is smaller than or equal to the same, it is determined that there is no foreign matter in the reproduction section, and the process returns to step S30. Next, the number of C ₂ P ₀ signals occurring during the next preset playback period is detected, and steps S40 and S50 are repeated.

Meanwhile, when the process proceeds from the step S50 to the step S60, in step S60, a foreign object is displayed on the disk as text through the screen 110.

As described above, the present invention has the effect of allowing the user to take appropriate measures by detecting and displaying foreign substances on the disc when the disc is played back and notifying the user.

Claims (2)

A method for detecting a foreign matter on a predetermined disc played back in an optical disc player, (A) loading the disc, reading and storing TOC (table of contents) data, and executing playback when a playback key signal is input; (B) detecting a C ₂ P ₀ signal occurring within a predetermined time while performing reproduction, and counting the number of the detected C ₂ P ₀ signals; (C) if the number of the counted C ₂ P ₀ signals is greater than the predetermined number by comparing the number of C ₂ P ₀ signals generated within the predetermined playback time counted in step (b) with a preset reference number Displaying the presence of foreign matter on the disc being played; (D) comparing the number of C ₂ P ₀ signals generated within the predetermined reproduction time counted in step (b) with a preset reference number, wherein the number of counted C ₂ P ₀ signals is smaller than the preset number. Or the same, returning to the step (b). The method of claim 1, wherein the reference number of the preset to be compared with the number of the detected C ₂ P ₀ signal is an optical disc player, characterized in that the minimum number of C ₂ P ₀ signal generated when there is a foreign matter on the disc Disk foreign matter detection method.