KR100280788B1 - Stream control method when optical disk is damaged - Google Patents

Abstract

The disclosed method of controlling a stream upon damage of an optical disc is to control the optical pickup to move to the place where the next I picture is located when the optical disc is damaged during the playback process of a player that plays an MPEG stream using the I picture included in the NV pack from the MPEG stream. It's about things.

The optical disc reproducing apparatus of the present invention reads each position information of the next I picture from the NV pack while the optical pickup reproduces an undamaged area of the optical disc, stores the position information of the next I picture in the internal memory of the control unit through the signal processing unit, and then reproduces it. If an error occurs more than three times in succession by checking the error correction code, it is determined that it is a damaged area, and the position of the pre-stored I picture is read to move the optical pickup step by step so that it can continue to play.

Therefore, when playing an optical disk with severe damage using the optical disk reproducing apparatus of the present invention, the optical pickup is moved to the position of the I picture so that the playback operation can be performed. Its effect is to reduce the amount of, and to skip the damaged area quickly.

Description

Stream control method when optical disk is damaged

The present invention relates to a stream control method when an optical disc is damaged. More specifically, the following I picture is located when an optical disc is damaged during a playback process of a playback device for playing an MPEG stream using an I picture included in an NV pack from an MPEG stream. The present invention relates to a stream control method when an optical disc is damaged to control an optical pickup to be moved.

In general, an optical disc reproducing apparatus for reproducing a recording medium such as an optical disc reproduces audio and video signals recorded in a data area of a disc according to the MPEG (Moving Pictures Experts Group) protocol and its use is gradually increasing.

Optical disc means DVD.

The disk recorded together with the above-described audio and video signals can not only be easily damaged but also can reproduce the recorded data cleanly using a laser.

Here, MPEG is a standard defined by a moving picture expert group of ISO (International Standardization Organization), and audio and video signals are compressed according to the MPEG standard described above.

The compressed audio and video signals are time division multiplexed, and the multiplexed audio and video signals are divided into packets and transmitted.

In this way, the audio and video signals compressed according to the MPEG standard are not only asynchronous, but the time relationship between the audio and video signals, that is, synchronization does not exist at the time of transmission. The audio signal and the video signal are synchronized so that the picture and sound exactly match.

1 is a diagram showing the structure of data recorded in a program area of a general optical disc.

As shown, the data area of an optical disc includes one or more titles each having one or more programs, for example, titles can designate fields such as movies, music videos, etc., where programs are consistent. As a constituent part of each title having contents, it means a predetermined movie or a music video of a predetermined singer.

In addition, each program is composed of one or more cells having the same data amount, and the cells are composed of one or more video object units (VOBUs) that satisfy the MPEG data standard.

That is, the MPEG data standard consists of an I picture, a P picture, and a B picture, and an NV (NaVigation) pack is located at the beginning of the standard of an optical disc using MPEG, and this NV pack has a position of an I picture.

When an optical disc is mounted in a deck in a conventional optical disc player that reproduces MPEG streams recorded on an optical disc, and when the damaged portion is reproduced on the optical disc during playback of the mounted optical disc, it is determined that the data area of the optical disc to be reproduced is a damaged portion. The optical pickup continues to be idle until it jumps by a predetermined number of tracks at the position of and recognizes a new I picture.

However, in playing the damaged optical disc in the above-described optical disc reproducing apparatus, since the reproduction operation of the optical pickup is held until the next I picture is recognized, the response characteristic is deteriorated especially when the damaged data is discarded during angle playback. there was.

Accordingly, it is an object of the present invention to solve the above-mentioned problems, in case an optical disc is damaged during a playback process of a playback device that plays back an MPEG stream using an I picture included in an NV pack from an MPEG stream, an optical system is located where the next I picture is located. An object of the present invention is to provide a stream control method when an optical disc is damaged so that pickup can be moved.

1 is a diagram showing the structure of data recorded in a program area of a general optical disc;

2 is a block diagram for explaining the configuration of an apparatus for controlling a stream when an optical disc is damaged according to the present invention;

3 is an operation flowchart illustrating a stream control method when an optical disk is damaged according to the present invention;

4 is a diagram showing a table that stores arbitrary video object unit search information applied to the present invention.

<Explanation of symbols for main parts of drawing>

10: optical pickup 20: control unit

30: signal processing unit 40: decoding unit

50: encoding unit 60: memory

70: audio amplifier

In the optical disc reproducing apparatus according to the present invention for achieving the above object, the present invention provides a signal processing unit that reads each positional information having the next I picture from an NV pack while the optical pickup reproduces an undamaged area of the optical disc. After storing the data in the internal memory of the control unit and checking the error correction code during playback, if an error occurs more than 3 times consecutively, it is determined to be a damaged area and the position of the previously stored I picture is read and the optical pickup is moved step by step. And play back.

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

2 is a block diagram illustrating a configuration of a stream control apparatus when an optical disc is damaged according to the present invention.

As shown, the optical pickup 10 reproduces the audio and video signals recorded on the optical disc.

The control unit 20 reads the data recorded on the optical disc, processes the signal, and controls the overall system for the user to see, and stores the position of the I picture input from the signal processing unit 30 in the internal memory and then damages the optical disc. When the region is played back, the optical pickup is moved to the region where the next I picture is located by using the position of the I picture stored in the internal memory.

The signal processor 30 processes and outputs an RF signal reproduced and output by the optical pickup 10 as a digital signal under the control of the controller 20, and controls the position of the I picture whenever the I picture is recognized during reproduction. Output to (20).

The decoder 40 restores an image signal input from the signal processor 30 and separates the video signal into a video and audio signal.

The encoder 50 encodes the video signal output from the decoder 40 into a single video signal, converts the video signal into a composite video signal, and outputs the composite video signal to an image display device such as a television receiver.

At this time, the encoding unit 50 encodes the NTSC, PAL or SECAM method according to the method adopted in each country, and outputs the composite video signal.

The memory 60 performs a variable bit rate transfer function as an error correction and a buffer of a signal converted into a digital signal by the signal processor 30.

Here, the variable bit rate function means that the transmission speed reproduced from the optical disc is faster than the data transmission rate required by the decoding unit 40, so that the difference in the transmission speed generated here is used by using the memory 60 as a buffer. It will be stored temporarily.

The audio amplifier 70 amplifies the audio signal output from the decoder 40 and outputs the amplified audio signal to a speaker connected to the inside or outside of the monitor.

With reference to the accompanying drawings, an operation for implementing the method of controlling a stream when an optical disc is damaged in the optical disc player according to the present invention configured as described above will be described in more detail.

3 is a flowchart illustrating a method of controlling a stream when an optical disc is damaged according to the present invention.

As shown in the figure, it is determined whether the user mounts the optical disc in the deck (S210), and if the determination results in mounting the optical disc in the deck, the control unit 20 controls the optical pickup 10 to play the data recorded on the optical disc. (S220).

At this time, the signal processing unit 30 converts the RF signal input from the optical pickup 10 into a digital signal and temporarily stores it in the memory 60, and the decoding unit 40 reads the digital signal stored in the memory 60. After reconstructing the video signal, the video signal and the audio signal are separated and output from the reconstructed video signal, and the encoding unit 50 encodes the video signal output from the decoding unit 40 into a single video signal. And output to a video display device such as a television receiver.

In this case, the encoding unit 50 encodes the NTSC, PAL or SECAM method according to the method adopted in each country, and outputs the composite video signal.

At this time, the signal processor 30 determines whether an I picture exists while converting the RF signal input from the optical pickup 10 into a digital signal (S230), and if the I picture is recognized as a result, the position of the I picture is determined. Output to the control unit 20.

Then, the controller 20 continuously determines whether or not the disk is damaged while storing the location of the I picture in the internal memory (S240) (S250).

At this time, if the error processing code (ECC) is checked in the signal processing unit 30 while converting to a digital signal, if three errors occur continuously, the signal processing unit 30 outputs it to the control unit 20, The controller 20 determines that the area of the disc currently being reproduced is a damaged area and reads the I picture position stored in the internal memory as the current position (S260).

Then, the control unit 20 controls the optical pickup 10 to jump (S270) after jumping by the set track from the current position (S270), and determines whether or not the set track exceeds N (S280) and If it is determined that the set track does not exceed N, playback is performed again from step S220. If the set track exceeds N, it is determined that the damaged area cannot be played and the damaged cell is skipped and the next cell is played back (S290). The optical pickup 10 is controlled.

That is, FIG. 4 is a diagram showing a table storing arbitrary video object unit search information applied to the present invention. As shown in FIG. 4, the optical disc player is generally set to 2x or 4x speed and the like. When the mounted optical disc is played back, it is played back with reference to the video object unit search information shown in FIG. That is, FWDI n (n = 1 ~ 15, 20, 60, 120, 240) or BWDI n (n = -1 ~ -15, -20, -60, -120,-to be played next according to the corresponding speed. If 240 is found, the content includes the start address of the video object unit, and the control unit 20 controls the optical pickup 10 to play back from the start address.

In the present invention, when an error occurs while playing the optical disc mounted on the deck by using this point, the optical pickup 10 jumps to the set FWDI n (n = 5, 10, 15, 20, 60, 120, 240). The control unit 20 controls to play the optical disc, but if the optical disc continuously generates an error and the optical pickup 10 jumps to FWDI n = 240, the contents of about 2 minutes are not played and a cell is skipped. And play the next cell.

Therefore, as described above, when playing a damaged optical disc by using the optical disc reproducing apparatus of the present invention, when playing a damaged area on the optical disc, the optical pickup is moved to the position of the next I picture so that the user can perform a reproducing operation. It provides an effect of reducing the visible damage of the screen, reducing the amount of discarded images, and quickly skipping the damaged area.

Claims (1)

A first step of determining whether or not the optical disc is mounted in the deck; A second step of controlling and playing an optical pickup when an optical disc is mounted in the deck as a result of the determination of the first step; A third step of determining whether an I picture exists during the execution of the second step; A fourth step of storing the location of the I picture in the internal memory when the I picture is recognized as a result of the third step; A fifth step of determining whether the area of the disc to be played back after performing the fourth step is a damaged area; A sixth step of reading the location of the I picture stored in the internal memory as the current location when the damaged area is determined as the fifth step; A seventh step of controlling the optical pickup unit to play data recorded on the disc by jumping from the current position read in the sixth step by a set track; An eighth step of determining whether the track set in the seventh step exceeds N; And a ninth step of controlling the optical pickup to skip damaged cells and play from the next cell when the set track exceeds N as a result of the determination in the eighth step.

Images