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Method and apparatus for concealing errors in a digital television

  • US 5,243,428 A
  • Filed: 10/08/1991
  • Issued: 09/07/1993
  • Est. Priority Date: 01/29/1991
  • Status: Expired due to Term
First Claim
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1. A method for concealing errors present in a sequence of blocks provided by a digital video compression system wherein a digital video signal is processed as a sequence of frames, said frames comprising intra-coded frames and predictive coded frames, each of said intra-coded frames comprising blocks which each comprise coefficients derived from said video signal, and each of said predictive coded frames comprising blocks which each comprise motion vectors derived from said video signal, and wherein an error signal is provided for a first block having an error, said method comprising the steps of:

  • a) storing said sequence of blocks including said first block so as to provide a sequence of output blocks delayed in time;

    b) storing said error signal so as to provide an output error signal synchronized in time with said first block;

    c) deriving a corrected block comprising information needed to conceal the error in said first block, whereby if said error consists of a loss of a coefficient, said information is replacement coefficient derived from coefficients of at least one of said stored plurality of blocks, and if said error consists of a loss of a motion vector, said information is a replacement motion vector derived from at least one motion vector of at least one of said stored plurality of blocks; and

    d) substituting said corrected block for said first block in said sequence of output blocks in the presence of said output error signal.

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