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Picture coder, picture decoder, and picture transmission system in which acknowledgment signals are sent in packed form

  • US 6,081,296 A
  • Filed: 09/04/1997
  • Issued: 06/27/2000
  • Est. Priority Date: 09/04/1996
  • Status: Expired due to Fees
First Claim
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1. An improved coder of the type having a coding means for coding a series of frames by intra-frame coding and inter-frame coding, a transmitting means for transmitting resulting coded data to a decoder through a first channel, and a reference frame updating means for selecting reference frames for use in inter-frame coding, each frame in the series of frames bing coded as a certain number of blocks, the certain number being an arbitrary positive integer, said improved coder comprising:

  • an acknowledgment signal receiving means for receiving acknowledgment signals from said decoder through a second channel, each acknowledgment signal among the acknowledgment signals pertaining to a plurality of blocks;

    an acknowledgment signal unpacking means, coupled to said acknowledgment signal receiving means, for unpacking each acknowledgment signal, thereby obtaining decoding-error information about individual blocks in the plurality of blocks; and

    a decoding-error memory means, coupled to said acknowledgment signal unpacking means, for storing the decoding-error information, and furnishing the decoding-error information to the reference frame updating means for use by said reference frame updating means in selecting the reference frames.

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