Echo canceller for a variable phase echo signal

Details Echo canceller for a variable phase echo signal Echo canceller for a variable phase echo signal

H - Electricity

04

B

340/72

H04B 15/00 (2006.01) H04B 3/23 (2006.01) H04L 25/08 (2006.01)

Patent

CA 1181146

41 ABSTRACT An echo canceller is connected between two trans- mit and receive paths, respectively, which are coupled to a two way path. This echo canceller is arranged for can- celling a variable phase echo signal occurring in the receive path and comprises an adaptive filter connected to the transmit path and a circuit for forming a difference signal between a signal supplied by this filter and a signal in the receive path. If ?(n) i a simulated phase of the echo signal at an instant nT, the echo canceller of the invention comprises either a phase shifter for changing over a phase angle ?(n) the phase of the complex signal formed in the receive path, or a phase shifter for changing over a phase angle ?(n) the phase of the complex signal supplied by the filter. The coefficients of the filter and of the simulated phase ?(n) are controlled together for minimizing the mean square value of the residual echo present in the difference signal. This echo canceller is used for data transmission over two-wire circuits.

373390

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