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

1989-03-22

1990-10-23

Ng, Jin F.

Multiplex communications

Wide area network

Packet switching

379411, H04B 323

Patent

active

049657860

ABSTRACT:
An echo canceller for cancelling a variable-phase echo signal is connected between two one-way send and receive paths coupled by means of a coupling circuit (6) to a two-way path. This echo canceller comprises an adaptive filter (92) cooperating with a phase shifter (95) for forming a replica of the echo signal, and a subtractor (72) inserted in the receive path for producing a difference signal between the echo signal and its replica. This canceller further comprises a suppressing circuit for suppressing a d.c. component (300) of the difference signal, which circuit is designed for supplying an adjusting quantity in the direction of the adaptive filter and the phase sifter.

REFERENCES:
patent: 4072830 (1978-02-01), Gitlin et al.
patent: 4682358 (1987-07-01), Werner
CCITT Recommendation V. 32.

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