Dual echo canceller with fast reflector identification

Details Dual echo canceller with fast reflector identification Dual echo canceller with fast reflector identification

2005-12-13

2005-12-13

Tran, Sinh (Department: 2646)

Telephonic communications

Echo cancellation or suppression

Using digital signal processing

C379S406010, C379S406020, C379S406060, C379S406090

Reexamination Certificate

active

06975722

ABSTRACT:
An echo canceller, which includes, receives and sends paths connected to standard telecommunication interfaces, a non adaptive filter with filter reflection coefficients which generate an estimated echo signal, which when subtracted from the send path input produces a nearly echo free send path output, an adaptive filter generating a second estimated echo signal, which when subtracted from the send signal, provides a possible alternative nearly echo free send path signal, a fast non iterative least squares method of estimating a reflection, a controller means which, in response to an observed non echo free send path output, causes the fast non iterative least squares method to search for possible new reflections, and a controller means for expurgating unnecessary reflection coefficients in the non adaptive filter.

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