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Framed digital voice summing for teleconferencing

  • US 4,658,398 A
  • Filed: 10/29/1984
  • Issued: 04/14/1987
  • Est. Priority Date: 10/29/1984
  • Status: Expired due to Term
First Claim
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1. Electronic signal processing apparatus for combining digital voice signals in teleconferencing comprising:

  • comparator means for comparing the activity levels of a plurality of digital signals to be combined and for determining a most active digital signal which has the greatest activity level;

    multiplier generator means for generating a multiplier for each of the digital voice signals, the multiplier for the most active digital signal being substantially greater than the other multipliers and the sum of the multipliers being about one;

    digital multiplier means for multiplying each digital voice signal with its respective multiplier, the same multiplier being applied through a plurality of digital samples; and

    digital summing means for summing the outputs of the multiplier means.

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