Echo cancellation in two-wire full-duplex data transmission with estimation of far-end data components

摘要: A full-duplex, two-wire Nyquist sampled data communication system includes an adaptive echo canceller (24) at each terminal (e.g., 10'). The generates a replica (z m ) of the component sample (r M incoming signal. and are subtractively combined to provide compensated signal (S ). During intervals simultaneous transmission reception, i.e., double talk, may contain not only uncancelled but also far-end component. An adaptation error generator (80), operating in response stream recovered symbols n ), estimates removes from and, difference, (γE M-D This is applied as canceller. allows adapt its set tap coefficients present Thus, stable accurate cancellation results even during double-talk interval.