Echo canceller for a baseband data signal

Details Echo canceller for a baseband data signal Echo canceller for a baseband data signal

H - Electricity

04

B

340/72

H04B 15/00 (2006.01) H04B 3/23 (2006.01)

Patent

CA 1211523

34 ABSTRACT: "Echo canceller for a baseband data signal." An echo canceller is used in a data transmission modem for cancelling in the baseband signal of the receive path an echo signal .epsilon.(t) produced by the data signal from the transmit path. The echo canceller comprises a difference circuit for forming the difference between the signal from the receive path s(t) + .epsilon.(t) and a synthetic echo copy signal ?(t). The echo copy signal is formed by at least one transversal filter which operates at a sampling frequency equal to the frequency of the data and whose coefficients are adjusted to minimize the mean-square value of an error signal. This error signal e(n) at an actual sampling instant n or the filter is determined by forming the difference between the value of the output signal of the difference circuit at the instant n and the value of this signal at the preceding sampling instant (n - 1), previously multiplied by the ratio between the value of the data recovered at the instant n and the value of the data recovered at the instant (n - 1).

438539

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