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Multi-speaker conferencing over narrowband channels

  • US 5,272,698 A
  • Filed: 07/02/1992
  • Issued: 12/21/1993
  • Est. Priority Date: 09/12/1991
  • Status: Expired due to Fees
First Claim
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1. A system for facilitating conferencing between users of a plurality of digitally encoded voice systems which each output encoded digital signals at their own data stream bit rates, wherein said system comprises:

  • an electrical network which is electrically connected with each of said digitally encoded voice systems and conduct said encoded digital signals therebetween; and

    a means for digital-to-digital conversion which is connected to said electrical network to receive and adjust the data stream bit rate of said encoded digital signals to enable each of the digitally encoded voice systems receive the encoded digital signals at its data stream bit rate, wherein said conversion means comprises a computer which receives digitized acoustic waveforms with coded values representing acoustic parameters that can include;

    pitch, synchronization, voicing and a spectral envelope, and wherein said computer is programmed to reencode the spectral envelope with cepstral coefficients that have and adjusted bit-rate and yield thereby the encoded digital signals at the data stream bit rates of each of the digitally encoded voice systems.

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