Arrangement for cancelling a composite echo signal

Details Arrangement for cancelling a composite echo signal Arrangement for cancelling a composite echo signal

H - Electricity

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340/72

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

Patent

CA 1181147

ABSTRACT: An arrangement for cancelling the composite echo signal formed by, for example, a linear component and a variable-phase component, comprises a linear echo canceller and a variable phase echo canceller, the difference cir- cuits of these echo cancellers being arranged in cascade The adjustable signal processing arrangement of each echo canceller are controlled fox minimizing a predetermined function (mean square value or time average of this mean square value), either of a residual echo signal appearing at the output of the difference circuit of this echo can- celler itself or of a residual echo signal appearing at the output of the cascade arrangement of the difference circuits. In all case the signal at the output of the 1 linear echo canceller contains only a rasidual variable-phase signal which can be compensated for by the variable-phase echo canceller. This arrangement in used in data transmission.,

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