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Lossless coding method for waveform data

  • US 6,664,913 B1
  • Filed: 05/17/1999
  • Issued: 12/16/2003
  • Est. Priority Date: 05/15/1995
  • Status: Expired due to Term
First Claim
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1. An invertible transformation signal processor for converting input integer-valued PCM n-channel waveform data to output integer-valued PCM n-channel waveform data, wherein the processor comprises:

  • an n-channel input for said input integer-valued PCM n-channel waveform data;

    an n-channel output for said output integer-valued PCM n-channel waveform data;

    an n-channel summing node;

    an n-channel differencing node;

    an n-channel quantiser rounding operation rounding to near or nearest integer values;

    a first n×

    n matrix filter means, each term of which incorporates delay;

    a second n×

    n matrix filter means, each term of which incorporates delay; and

    , a first and a second n×

    n matrix quantiser, wherein the n-channel input is coupled to the summing node via said first n×

    n matrix quantiser, the n-channel input is coupled to the differencing node via the first n×

    n matrix filter, the n-channel output is coupled to the differencing node via the second n×

    n matrix filter, the n-channel differencing node is coupled to the n-channel quantiser, the n-channel quantiser is coupled to the n-channel summing node, and the n-channel summing node is coupled to the n-channel output via the second n×

    n matrix quantiser.

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