Echo cancellation processing system

Details Echo cancellation processing system Echo cancellation processing system

2006-04-25

2006-04-25

Harold, Jefferey F. (Department: 2646)

Telephonic communications

Echo cancellation or suppression

Using digital signal processing

C379S406020, C379S406080

Reexamination Certificate

active

07035398

ABSTRACT:
A wraparound delay amount detecting part calculates a cross-correlation r(k) from an output speech signal “ai” supplied to a loudspeaker and an input speech sigal “bi” inputted through a microphone array to obtain a delay amount “d” of a wraparound speech signal. The delay processing part generates a speech signal “ai-d” obtained by delaying the output speech signal “ai” by the delay amount “d”. Even if there is a change in delay amount due to the variation in environment, appropriate delay processing can be conducted by the delay processing part. In an adaptive filter, an estimated wraparound speech signal ai-d′ is generate from the speech signal “ai-d” subject to delay processing. A subtracter subtracts the estimated wraparound speech signal ai-d′ from the input speech signal “bi” to generate an echo cancellation signal “ei”. A coefficient updating part updates the coefficient of the adaptive filter.

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Office Action of the corresponding Japanese Application No. 2001-245686.
Office Action mailed Jun. 7, 2005 for Japanese Patent Application No. 2001-245686 citing JP 3-113923; USP 4,998,241 corresponding to JP 3-113923, the examiner referring to col. 5, lines 9-16 of USP 4,998,241.

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