Echo canceller using delta modulation

Details Echo canceller using delta modulation Echo canceller using delta modulation

H - Electricity

04

B

340/72

H04B 3/23 (2006.01)

Patent

CA 1252166

37 ABSTRACT: An echo canceller designed to cancel an echo signal [g(t)] generated in a send path (7) by a signal [f/(t)] applied to a receive path (1) contains a sub- tractor (9) whose positive terminal receives a signal derived from the echo signal and whose negative terminal receives the output signal from a transversal filter (10) provided with means (12) for adjusting the filter coefficients in such a way that the component due to the echo signal is cancelled at the output of the subtractor (9). This echo canceller comprises a delta encoder (14) for encoding at a sampling rate 1/T the signal f(t) entering the receive path (1) and for supplying at the input of the transversal filter (10) a delta-encoded sig- nal (.DELTA.Fn), a circuit (22) for forming at the sampling rate 1/T the difference signal (dn) between two consecutive samples of the signal entering the send path (7) and for applying this signal to the positive terminal of the sub- tractor (9), and finally an integrator (13) connected to the output of the subtractor (9) and supplying the output signal of the send path (7).

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