KR0186141B1 - Method for the reproduction control of a disc player - Google Patents

Abstract

The present invention relates to a playback control method of a disc player. The present invention relates to a playback method of a digital video disc (DVD). When the low speed playback is N times slow playback, one screen is played every N horizontal syncs. In this case, the forward track jump is performed one by one, and the operation of clearing the buffer is repeated. The present invention controls the playback operation of the disc according to the setting mode, thereby preventing the overflow of the buffer, as well as providing a clear image quality. Can be provided.

Description

How to control the playback of a disc player

1 is a configuration diagram of a regeneration control device of the present invention.

2 is a signal flow diagram for slow playback in the present invention.

3 is a signal flow diagram for high speed reproduction in the present invention.

* Explanation of symbols for main parts of the drawings

103: digital signal processing unit 104: data extraction unit

105: buffer 106: MPEG decoder

107: video encoder 108: monitor

109: Servo 110: Motor

111,112: Microcomputers

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a disc playback control technique. In particular, in the playback of a digital video disc (DVD), if the playback is N times slow, one screen is played every N horizontal syncs and a back track jump instruction is performed. The present invention relates to a playback control method of a disc player which prevents overflow of a buffer.

According to the present invention, when the low speed reproduction is set, counting the horizontal synchronizing signal to determine whether the count value N is larger than the reference value ref, and if the count value N is smaller than the reference value ref, decoding is performed. Stopping and repeating the above steps; if the coefficient value N is greater than the reference value ref, decoding is performed, and the coefficient value N is cleared to zero and the step is repeated. Is done.

In the present invention, when fast playback is set, the process of repeatedly determining whether a track jump is finished while performing a forward jump by an arbitrary track is performed by clearing a variable bit rate buffer, storing data in the buffer, and decoding the buffer. .

Hereinafter, the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, the reproduction control apparatus of the present invention filters the pickup 102 for detecting recording data from the disk 101 rotated by the motor 110 and the detection signal of the pickup 102. A digital signal processor 103 for performing a processing such as the above, a data extractor 104 for outputting an MPEG bit stream as an input signal of the digital signal processor 103, and the data extractor 104. The buffer 105 which stores the output data, the MPEG decoder 106 which outputs a video signal by reading and decoding the stored data of this buffer 105, and the output signal of this MPEG decoder 106 are combined and monitored ( 108 is a video encoder 107 for outputting primary color signals R, G, and B, data input and output of the buffer 105, decoding operations of the MPEG decoder 106 and operations of the video encoder 107. Control and determine the storage level of the buffer 105 according to the mode. The microcomputer 112 outputs a track jump command, and performs data transmission / reception with the microcomputer 112 to control the digital signal processor 103 and to drive the pickup 102 and the motor 110. The microcomputer 111 which controls the servo 109 is comprised.

Referring to the operation and effect of the present invention configured in this way in detail as follows.

First, in the normal reproducing operation, the servo 109 controls the motor 110 under the control of the microcomputer 111 to rotate the disk 101 at a constant speed and to transfer the pickup 102 at a constant speed. The pickup 102 detects data recorded on the disc 101 and outputs the data to the digital signal processing unit 103.

At this time, when the digital signal processing unit 103 under the control of the microcomputer 111 outputs the digital signal to the data extraction unit 104 through signal processing such as filtering, the MPEG bit stream output from the data extraction unit 104. Is stored in the buffer 105 which is a variable bit rate memory.

Thereafter, as the MPEG decoder 106 reads and decodes the MPEG data stored in the buffer 105, the video encoder 107 combines the decoded video signals to monitor the primary color signals R, G and B. The video is displayed on the screen by outputting it.

In this case, the MPEG decoder 106 reads an irregular amount of MPEG data from the buffer 105 for every horizontal synchronization signal, so that the microcomputer 112 generates a microcomputer 111 when an overflow occurs in the buffer 105. It will send a command to jump back track.

As a result, the microcomputer 111 tracks the pickup 102 to the inner circumferential side through the servo 109 to stop the playback of the disc 101 for a predetermined time.

Thereafter, when the stored data of the buffer 105 is below a predetermined storage level and the microcomputer 1112 instructs the microcomputer 111 to release track jump, the pickup 102 driven by the servo 109 becomes a disk ( 101, the recording data is detected from the digital signal processor 103, and the output signal of the digital signal processor 103 is outputted from the data extractor 104, the buffer 105, the MPEG decoder 106, and the video encoder ( 107 is sequentially output to the monitor 108 as primary color signals (R, G, B) and displayed on the screen as an image.

When the pickup 102 detects the data recorded on the disc 101 and outputs the data to the digital signal processor 103, the digital signal processor 103 outputs the digital signal through signal processing such as filtering. The MPEG bit stream outputted to the extraction section 104 and outputted from the data extraction section 104 is stored in the buffer 105 which is a variable bit rate memory.

At this time, the MPEG decoder 106 slows the operation of reading from the buffer 105 for every horizontal synchronization signal under the control of the microcomputer 112.

Accordingly, the video signal decoded at a slow speed by the MPEG decoder 106 is output to the monitor 108 through the video encoder 107, so that an image of a slow motion is displayed on the screen.

When the low-speed playback is performed, the amount of data read from the buffer 105 by the MPEG decoder 106 in the buffer 105 is reduced, and an overflow occurs because the amount of data stored in the buffer 105 exceeds a threshold. When the microcomputer 112 transmits a track jump command to the microcomputer 111, the microcomputer 111 pauses the playback of the disc 101 by track jumping the pickup 102 to the inner circumferential side through the servo. This prevents the occurrence of overflow.

Thereafter, when the amount of stored data in the buffer 105 is equal to or less than a predetermined value, the pickup 102 again detects the recording data from the disc 101 by instructing the microcomputer 112 to release the track jump to the microcomputer 111. Will continue to perform the operation.

For example, in the case of N-times slow motion, one screen is reproduced every N horizontal synchs, and an overflow occurs in the buffer 105 as the amount of data read from the buffer 105 by the MPEG decoder 106 decreases. Before doing so, the microcomputer 112 transmits a track jump command to the microcomputer 111 to pause playback of the disc 101, thereby preventing the overflow of the buffer 105.

This slow regeneration operation is performed by the signal flow of FIG.

On the other hand, when fast playback is set, first, the microcomputer 112 clears the buffer 105 and the servo 109 under the control of the microcomputer 111 causes the pickup 102 to jump forward track. do.

Thereafter, when the pickup 102 outputs the recording data detected from the disc 101 to the data extraction unit 104 through a process such as filtering by the digital signal processing unit 103, the data extraction unit 104 receives MPEG bits. The stream is output to the buffer 105 and stored.

Accordingly, when the MPEG decoder 106 reads and decodes the stored data of the buffer 105, the video encoder 107 which takes the decoded data as an input is converted into the primary color signals R, G, and B, and the monitor 108 Still image is displayed on the screen.

Thereafter, when the still state image is displayed on the screen of the monitor 108, the pickup 102 moves forward by the microcomputer 111 performing data transmission and reception with the microcomputer 112 to control the servo 109. When the jump is detected and the recording data of the jump point is detected and output to the digital signal processing unit 103, the above process is repeated to display a new image on the screen of the monitor 108 in a still state.

That is, the above operation is performed each time the pickup 102 uses the PBI information in each GOP detected by the disc 101 or jumps an arbitrary amount of forward tracks. By performing the jump operation repeatedly, high speed playback is realized.

This fast reproducing operation is performed by the signal flow of FIG.

As described in detail above, the present invention has the effect of preventing the overflow of the buffer and providing a clear image by controlling the play operation of the disc according to the setting mode.

Claims (2)

A first step of counting the horizontal synchronizing signal when the low speed reproduction is set and determining whether the count value N is larger than the reference value ref; and if the count value N is smaller than the reference value ref, decoding is stopped. After the second step of repeating the first step, if the coefficient value (N) is greater than the reference value (ref), decoding is performed, and the coefficient value (N) is cleared to 0 and the first step is repeated. And a third step of performing the reproduction control method of the disc player. A first step of clearing the buffer and reading the forward track when the fast playback mode is set, a second step of storing data read from the forward track in the buffer, and a third step of decoding the data stored in the buffer and outputting it as a still image. And a fourth step of repeating the second and third steps until the fast playback mode is cancelled.