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Playback method and apparatus for playback coded data in inversion playback operation

A technology of encoding data and decoding method, applied in the field of replay and device for replaying encoded data in reverse replay operation, can solve the problem of increasing power consumption and heat dissipation, increasing the size and capacity of heat radiation device, and increasing circuit scale and cost issues, to achieve the effect of reducing the size

Inactive Publication Date: 2004-10-20
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This additional memory increases circuit size and cost
In addition, power consumption and heat dissipation are also increased, which necessitates an increase in the size and capacity of the heat radiation device

Method used

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  • Playback method and apparatus for playback coded data in inversion playback operation
  • Playback method and apparatus for playback coded data in inversion playback operation
  • Playback method and apparatus for playback coded data in inversion playback operation

Examples

Experimental program
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Embodiment Construction

[0049] FIG. 1 shows the structure of an embodiment of a playback apparatus according to the present invention.

[0050] In the embodiment shown in FIG. 1, a spindle motor (not shown) controls the rotation of the optical disc 1 at a predetermined rotational speed. Laser light generated by the reader 2 is applied to the tracks of the optical disc to read digital data recorded thereon. Before recording, the digital data is encoded and compressed according to the MPEG standard. The reproduced digital data is EFM-demodulated by the demodulation circuit 3 and supplied to the sector detection circuit 4. In addition, the output of the reader is supplied to a PLL circuit 9 to reproduce a clock signal. The reproduced clock signal is supplied to a demodulation circuit and a sector detection circuit.

[0051] Such as Figure 11 As shown, digital data is recorded in fixed-length sector units on the optical disc, and a synchronization code and a sector header are added at the beginning o...

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Abstract

Encoded data is reversely reproduced by decoding each picture only once and using only as many frame memory sections as are needed in a normal playback operation. A picture header detector detects a picture header from data read out from a video code buffer to identify the type of picture The picture type information controls a picture data selecting circuit for selecting frames of I and P pictures equal in number to the number of frame memory sections in a frame memory bank. The selected frames are supplied to an inverse VLC circuit to be decoded, starting at the head of a GOP with an I picture. The decoded I and P pictures are stored in the frame memory bank and transmitted to a display unit, starting with the temporally most recent picture and reading backward.

Description

[0001] This application is a divisional application of the following patent application: the filing date is January 31, 1996, the application number is 96101453.9, and the title of the invention is "Replay method and device for replaying coded data in reverse replay operation". technical field [0002] The present invention relates to a reproducing method and apparatus for reproducing encoded data of video and audio data recorded on a recording medium such as an optical disc or a magnetic disc. Background technique [0003] The MPEG (Moving Picture Experts Group) standard is a technology used to compress / encode digital video signals recorded on recording media such as digital video discs (DVD). [0004] The predicted structure of a video image frame compressed according to the MPEG standard is shown in FIG. 10A. A group of pictures (GOP) specifically includes 15 frames. A typical GOP contains one I picture, 4 P pictures and 10 B pictures. A GOP is a coding unit for dividin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/92G11B20/10H03M7/36H04N5/783H04N5/85H04N9/804H04N9/877
CPCH04N5/85H04N5/783H04N9/877H04N9/8042G11B7/007
Inventor 河村真藤波靖米满润中川富博
Owner SONY CORP
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