Echo canceler having adaptive digital filter unit associated...

Details Echo canceler having adaptive digital filter unit associated... Echo canceler having adaptive digital filter unit associated...

H - Electricity

04

B

H04B 3/23 (2006.01)

Patent

CA 2045250

An echo canceler comprises an adaptive digital filter circuit for producing an echo replica signal on the basis of a transmit digital signal and a first digital signal indicative of a far-end signal, and an adder for eliminating the echo signal from a received signal with reference to the echo replica signal, wherein the echo replica signal is modulated by a delta-sigma modulation circuit and, thereafter, converted into an analog signal for allowing the adder to operate on the echo replica signal and the received signal both in an analog form so that the adder with a narrow dynamic range can be available.

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