Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
2005-02-01
2005-02-01
Corsaro, Nick (Department: 2684)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C379S406040, C455S569100
Reexamination Certificate
active
06850783
ABSTRACT:
Methods and apparatus for echo and noise cancelation contemplate occasional saturation of an echo and/or noise containing source signal and control adaptation of a cancelation filter to minimize the detrimental effects of such source signal saturation. According to exemplary embodiments, filter coefficients of an adaptive filter are updated only when a prevailing value of the source signal is within a predetermined range of possible source signal values. Consequently, the filter response is not perturbed by source signal saturation, and the adaptive filter continues to provide quality echo suppression even immediately following periods of saturation.
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Coats & Bennett P.L.L.C.
Corsaro Nick
Ericsson Inc.
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