Transcoder, recorder, and transcoding method

Details Transcoder, recorder, and transcoding method Transcoder, recorder, and transcoding method

2011-04-12

2011-04-12

Liu, Shuwang (Department: 2611)

Pulse or digital communications

Bandwidth reduction or expansion

Television or motion video signal

C375S240100, C375S240110, C375S240130, C375S240160, C352S059000

Reexamination Certificate

active

07924919

ABSTRACT:
In a transcoder that decodes and encodes a motion picture stream, a highly compressed motion picture stream cannot be obtained if the same corresponding frame is referenced for coding purposes in a situation where an intraframe coding mode, in which an unconverted stream is not provided with vector information, is used and in a situation where an interframe predictive coding mode, in which the unconverted stream is provided with vector information, is used. Further, if an additional frame is referenced after searching for the corresponding frame, the circuit scale and power consumption increase. To solve the above problems, the disclosed transcoder comprises a decoder for decoding an input motion picture stream and detecting sub-information indicating whether an intraframe coding scheme or interframe predictive coding scheme is used; and an encoder for changing the frame to be referenced at the time of coding depending on whether the sub-information indicates the use of the intraframe coding scheme or interframe predictive coding scheme.

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