Browsing by Author "A. Goubran, Rafik"

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    Transcoders and mixers for voice-over-IP conferencing
    (Carleton University; RPX Clearinghouse LLC, 2009) Samy El-Hennawey, Mohamed; A. Goubran, Rafik; Qian, Zhihong
    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.