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Digital speech coder having improved vector excitation source

  • US 4,896,361 A
  • Filed: 01/06/1989
  • Issued: 01/23/1990
  • Est. Priority Date: 01/07/1988
  • Status: Expired due to Term
First Claim
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1. A means for providing a set of 2M codebook vectors for a vector quantizer, said codebook vector providing means comprising:

  • memory means for storing said set of codebook vectors, said set of stored codebook vectors formed by;

    converting a set of selector codewords into a plurality of interim data signals;

    inputting a set of M basis vectors;

    multiplying said set of basis vectors by said plurality of interim data signals to produce a plurality of interim vectors; and

    summing said plurality of interim vectors to produce said set of codebook vectors;

    means for addressing said memory means with a particular codeword; and

    means for outputting a particular codebook vector from said memory means when addressed with said particular codeword.

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