Analog echo canceller with filter banks

Details Analog echo canceller with filter banks Analog echo canceller with filter banks

2008-09-23

2010-11-30

Ngo, Ricky (Department: 2464)

Multiplex communications

Duplex

Transmit/receive interaction control

C370S286000, C370S201000

Reexamination Certificate

active

07843859

ABSTRACT:
A method and system are described for canceling an echo signal in analog domain with adaptive filters working in digital domain. In one embodiment, a system includes an analog-to-digital converter (ADC) sampling at two different phases to generate a first error signal and a second error signal having different phases. The ADC operates at a frequency significantly lower than the frequency at which the individual filters run. The first adaptive filter unit and a second adaptive filter unit are independently trained with the first and second error signals, respectively. The first and second adaptive filter units generate echo estimate signals used to cancel the echo signal.

REFERENCES:
patent: 5148488 (1992-09-01), Chen et al.
patent: 2004/0120272 (2004-06-01), Yong-Woon
patent: 2006/0133303 (2006-06-01), Shida

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