Echo canceler having adaptive digital filter unit associated wit

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

1991-06-25

1993-06-22

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 32, 370 29, 379406, 379410, 381 93, 381 94, H04J 1500, H04L 514, H04M 100, H04M 908

Patent

active

052220842

ABSTRACT:
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.

REFERENCES:
patent: 4582963 (1986-04-01), Danstrom
patent: 4742510 (1988-05-01), Quatieri
patent: 4746902 (1988-05-01), Tol et al.
patent: 4827472 (1989-05-01), Ferrieu
patent: 4972436 (1990-09-01), Halim et al.
patent: 4987569 (1991-01-01), Ling et al.
patent: 5029167 (1991-07-01), Arnon et al.
FIR Digital Filters for High Sample Rate Applications, Tewksbury et al. IEEE Communication Magazine, Jul. 1987.

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