Arrangement for cancelling a composite echo signal

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

1985-03-28

1989-08-29

Ng, Jin F.

Multiplex communications

Wide area network

Packet switching

379411, H04B 324

Patent

active

048624500

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 circuits of these echo cancellers being arranged in cascade. The adjustable signal processing arrangements of each echo canceller are controlled for minimizing a predetermined function (mean square value or time average of this means 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 cases the signal at the output of the linear echo canceller contains only a residual variable-phase signal which can be compensated for by the variable-phase echo canceller.

REFERENCES:
patent: 4072830 (1978-02-01), Gitlin et al.
patent: 4162378 (1979-07-01), Baudoux et al.
patent: 4355214 (1982-10-01), Levy et al.
N. Demytko, K. English; "Echo Cancellation on Time-Variant Circuits"; Proceedings of IEEE; vol. 65, No. 3; Mar. 1977; pp. 444-453.

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