Basic HTML version of Foils prepared April 13 98

Foil 5 Technology Audio Compression

From Multiplatform Desktop Videoconferencing System for Internet Defense of 5 CIS Master's Theses -- Dec 15 1997. by Tom Stachowiak
GSM speech compression
  • cellular telephony standard
  • designed specifically for the speech signals
  • based on Long-Predictive Coding (LPC)
  • modeling of the human vocal tract with an adaptive filter
  • transmitted data:
    • filter coefficients
    • general characteristics of the signal(e.g. gain, lag)
    • residual pulse excitation

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