Method of cancelling echoes in full-duplex data transmission sys

Details Method of cancelling echoes in full-duplex data transmission sys Method of cancelling echoes in full-duplex data transmission sys

1985-09-17

1988-09-06

Ng, Jin F.

Multiplex communications

Wide area network

Packet switching

379410, H04B 323

Patent

active

047698080

ABSTRACT:
A first difference signal is obtained by subtracting an echo replica from a mixed signal which consists of a received signal and an echo. The echo replica is produced in an adaptive digital filter using an error signal. The first difference signal includes the received signal and a residual echo, and is delayed in a manner to produce a delayed first difference signal. The delayed first difference signal is subtracted from the first difference signal to obtain a second difference signal. Thereafter, a polarity of the residual echo included in said second difference signal is detected. The error signal is obtained based on the detected polarity, and then is applied to the adaptive digital filter.

REFERENCES:
patent: 4571465 (1986-02-01), Brie et al.
patent: 4621172 (1986-11-01), Kanemasa et al.
"Digital Echo Cancellation for Baseband Data Transmission", Verhoeckx et al., IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-27, No. 6, Dec. 1979, pp. 768-781.

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