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Method of and system for handling conference calls in digital telephone exchange

  • US 4,076,966 A
  • Filed: 08/02/1976
  • Issued: 02/28/1978
  • Est. Priority Date: 08/02/1976
  • Status: Expired due to Term
First Claim
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1. A method of linearly superposing significant portions of logarithmically coded coincident voice samples in a conference call, each voice-sample code consisting of a polarity bit, a plurality of higher-order range bits and a plurality of lower-order quantum bits, the numerical weights of said quantum bits depending on the rank of the code as determined by said range bits, comprising the steps of:

  • a. separately storing a higher-ranking code and a lower-ranking code derived from a pair of coincident voice samples to be arithmetically combined;

    b. downshifting the quantum bits of the lower-ranking code to less significant bit positions in which they would have their original numerical weights if prefaced by the range bits of the higher-ranking code;

    c. comparing the polarity bits of the two codes stored in step (a); and

    d. subjecting the quantum bits of the higher-ranking code and the downshifted quantum bits of the lower-ranking code to an algebraic summing operation with a sign depending on the relative values of the corresponding polarity bits as determined by step (c).

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