Adaptive echo canceller with AGC for transmission systems

Details Adaptive echo canceller with AGC for transmission systems Adaptive echo canceller with AGC for transmission systems

1982-12-01

1986-01-14

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

1791702, H04B 320

Patent

active

045649340

ABSTRACT:
An adaptive echo canceller for a full duplex transmission system comprises a cascade arrangement of an adaptive digital filter and an automatic gain control device. The AGC device receives the output signal from the adaptive digital filter and delivers the estimate of the echo signal to the receive line for subtraction. It has a multiplier receiving the output signal and a signal representative of the multiplication factor from a gain adaptation circuit. A separate gain change circuit is connected to receive the output signal from the adaptive digital filter and simultaneously modifies the tap coefficients of said filter and the multiplication factor of the AGC device in opposite directions for maintaining the output of the adaptive digital filter in a predetermined range.

REFERENCES:
patent: 3732410 (1973-05-01), Mackechnie
patent: 3780233 (1973-12-01), Campanella et al.
patent: 4126770 (1978-11-01), Tamura et al.
patent: 4131767 (1978-12-01), Weinstein
patent: 4268727 (1981-05-01), Agrawal et al.
patent: 4349889 (1982-09-01), van den Elzen et al.
patent: 4352962 (1982-10-01), LaMothe
patent: 4355406 (1982-10-01), Guidoux
patent: 4360712 (1982-11-01), Horna
D. D. Falconer et al., Adaptive Echo Cancellation/AGC Structures for Two Wire, Full Duplex Data, Transmission, The Bell System Technical Journal, vol. 58, No. 7, Sep. 1979, pp. 1593-1596.

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