Multiplex communications – Special services – Conferencing
Reexamination Certificate
2004-07-15
2009-11-17
Ngo, Ricky (Department: 2416)
Multiplex communications
Special services
Conferencing
C370S493000, C370S252000, C370S494000, C370S261000, C370S266000, C704S219000, C704S215000
Reexamination Certificate
active
07619995
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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El-Hennawey Mohamed Samy
Goubran Rafik A.
Qian Zhihong
Mintz Levin Cohn Ferris Glovsky and Popeo P.C.
Ngo Ricky
Nortel Networks Limited
Samuel Dewanda
LandOfFree
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