Telephonic communications – Echo cancellation or suppression – Using digital signal processing
Reexamination Certificate
2006-02-21
2006-02-21
Tran, Sinh (Department: 2646)
Telephonic communications
Echo cancellation or suppression
Using digital signal processing
C379S406010, C379S406020, C379S406040, C379S406060, C379S406080, C379S406090, C379S406120
Reexamination Certificate
active
07003101
ABSTRACT:
A method of controlling an echo canceller in a communications channel, is disclosed wherein input signals from the communications channel are first subbanded into a subband. Echo locations are then identified within the subband and are used to control the echo canceller. Typically, the echo canceller will be a fullband echo canceller with an adaptive filter, in which case the echo locations are used to control the filter coefficients.
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(Marks & Clerk)
Mitchell Richard J.
Singh Ramnandan
Tran Sinh
Zarlink Semiconductor Inc.
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