Transcoders and mixers for voice-over-IP conferencing

Details Transcoders and mixers for voice-over-IP conferencing Transcoders and mixers for voice-over-IP conferencing

2009-10-09

2011-12-13

Mui, Gary (Department: 2464)

Multiplex communications

Special services

Conferencing

C370S252000, C370S493000, C370S494000

Reexamination Certificate

active

08077636

ABSTRACT:
Transcoders and mixers having reduced algorithmic delay and processing complexity. An improved mixer for signals having encoded speech parameters wherein the parameters obtained through decoding are used by a parameter estimator to improve the encoding by providing a parameter estimate for the mixed signal. In the case of pitch parameters, the mixer uses the principle of strong-pitch-domination. The mixing of wideband signals is simplified by performing mixing of individual lower and upper sub-bands. A transcoder and a mixer that converts a wideband signal into a narrowband signal relies upon high frequency suppression. A transcoder and a mixer that converts a narrowband signal into a wideband signal relies upon filter combination.

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