| 摘要 |
<p>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 circuits 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 canceller 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.,</p> |
