Echo and noise cancellation

Details Echo and noise cancellation Echo and noise cancellation

2006-05-04

2009-06-09

Jamal, Alexander (Department: 2614)

Telephonic communications

Echo cancellation or suppression

Using digital signal processing

C379S406020

Reexamination Certificate

active

07545926

ABSTRACT:
Methods and apparatus for echo cancellation in a system having a speaker and a microphone are disclosed. The speaker receives a speaker signal x(t). The microphone receives a microphone signal d(t) containing a local signal s(t) and an echo signal x1(t) that is dependent on the speaker signal x(t). The microphone signal d(t) is filtered in parallel with first and second adaptive filters having complementary echo cancellation properties relative to each other. A minimum echo output e3(t) is determined from an output e1(t) of the first adaptive filter and an output e2(t) of the second adaptive filter. The minimum echo output has a smaller energy and less correlation to the speaker signal x(t). A microphone output is then generated using the minimum echo output e3(t).

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