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Feedback residue compression for digital speech systems

  • US 3,973,081 A
  • Filed: 09/12/1975
  • Issued: 08/03/1976
  • Est. Priority Date: 09/12/1975
  • Status: Expired due to Term
First Claim
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1. A digital speech compression system comprising:

  • a. a digital source of speech;

    b. a first digital adder;

    c. a quantizer;

    d. a compression logic, said source having its output connected to said first adder, and said quantizer and compression logic being connected in cascade to an output of said first adder, the output of said compression logic being the compressed digital speech; and

    e. a predictor loop connected between said compression logic and a negative input of said first adder, said predictor loop including;

    f. a second digital adder; and

    g. a digital predictive filter, said compression logic being coupled to an input of said adder which in turn is connected to said filter and to the negative input of said first adder, the output of said filter being further connected to another input of said second adder, whereby the residue stream of digital data is estimated inside said predictor loop.

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