Acoustic echo cancellation

Details Acoustic echo cancellation Acoustic echo cancellation

2005-09-20

2005-09-20

Harold, Jefferey F. (Department: 2644)

Telephonic communications

Echo cancellation or suppression

Residual echo cancellation

C379S406060, C379S406070, C379S406010

Reexamination Certificate

active

06947550

ABSTRACT:
The invention is an echo canceller for reducing the magnitude of an echo occurring in a return channel of a communication device and a method of implementing the same. The echo canceller includes a processing unit for generating an echo attenuated signal. The processing unit includes a first input, a second input and an output. The first input is for receiving a first signal that is the precursor of the echo. The second input is for receiving a second signal that potentially contains the echo. The output is for outputting the echo attenuated signal. The echo attenuated signal is derived by combining the second signal and an adaptation signal. The adaptation signal is generated by normalizing the echo attenuated signal to produce a normalized adaptation signal, and combining the normalized adaptation signal with the first signal to generate an intermediate signal. Additionally, the intermediate signal is de-normalized to produce the adaptation signal.

REFERENCES:
patent: 6377682 (2002-04-01), Benesty et al.
patent: 2004/0252826 (2004-12-01), Tian et al.

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