Telephonic communications – Echo cancellation or suppression – Using digital signal processing
Reexamination Certificate
2007-03-06
2007-03-06
Swerdlow, Daniel (Department: 2615)
Telephonic communications
Echo cancellation or suppression
Using digital signal processing
C379S390020, C370S286000
Reexamination Certificate
active
10722472
ABSTRACT:
A method of determining when to save default coefficients in an echo canceller so as to ensure that the capture of coefficients that correspond to the best possible echo cancellation in a current condition. Coefficients are saved at varying times depending on the amount of echo removed by the echo canceller. More particularly, the present method involves constantly monitoring the error signal to the echo canceller and comparing it with the error signal that would be obtained if default coefficients were to be used instead of the current coefficients. This ensures that the default coefficients are upgraded each time the current set of coefficients is better than the saved default coefficients.
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Popovic Mirjana
Xu Xin
Antonelli, Terry Stout and Kraus, LLP.
Mitel Knowledge Corporation
Swerdlow Daniel
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