Echo canceller

Details Echo canceller Echo canceller

1988-07-20

1990-11-20

Ng, Jin F.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379410, 370 321, 375120, H04M 100

Patent

active

049724673

ABSTRACT:
An echo canceller includes a first transversal filter for generating a first echo canceling signal to be canceled from an output signal from a sampler, the first echo canceling signal corresponding to a first sampling value of an echo response waveform of an echo path by a sampling clock when no sampling clock jitter occurs, a second transversal filter for generating a second echo canceling signal corresponding to a difference between the first sampling value and a second sampling value when the sampling clock jitter occurs, two subtractors for canceling the first and second echo canceling signals from a digital reception signal output from the sampler, and a controller for detecting the sampling clock jitter and performing a control operation such that a tap coefficient value of the second filter is added to a tap coefficient value of the first filter to update the tap coefficient value of the first filter, and thereafter, the second echo canceling signal generating operation of the second filter is disabled.

REFERENCES:
patent: 4695998 (1987-09-01), Schollmeier et al.
"Adaptive Echo Canceling for Baseband Data Transmissioin", Electrical Communication, vol. 59, No. 3, 1985, pp. 338,344.
"Clock Sensitivity Reduction in Echo Cancellers", S. A. Cox, Electronics Letters, vol. 21, No. 14, 7-4-85, pp. 585-586.

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