Analog echo canceller with interpolating output

Details Analog echo canceller with interpolating output Analog echo canceller with interpolating output

2008-09-23

2010-11-23

Ngo, Ricky (Department: 2464)

Multiplex communications

Crosstalk suppression

C370S235000

Reexamination Certificate

active

07839758

ABSTRACT:
A method and system are described for canceling an echo signal with an echo canceller in the analog domain. In one embodiment, a system includes an echo canceller that includes an interpolation filter unit, operating in a digital domain, that receives a first digital echo estimate signal from a LMS unit and generates a second digital echo estimate signal without oversampling. A digital-to-analog converter (DAC) receives the second digital echo estimate signal and generates an analog echo estimate signal without oversampling. The echo canceller prevents the DAC from adding a high frequency component to the analog echo estimate signal. A subtractor adds the analog echo estimate signal to an incoming signal having an echo signal. The subtractor generates an analog signal with reduced echo signal in the useful frequency band of the incoming signal.

REFERENCES:
patent: 5148488 (1992-09-01), Chen et al.
patent: 5777913 (1998-07-01), Rasmusson
patent: 2006/0133303 (2006-06-01), Shida

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