Echo canceller

Details Echo canceller Echo canceller

1988-11-07

1990-10-23

Ng, Jin F.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379406, 379410, 370 321, H04M 100

Patent

active

049658239

ABSTRACT:
An echo canceller of this invention cancels an echo signal input to a sampler through an echo path upon 2-wire/4-wire conversion. The echo canceller includes a filter having a characteristic for reducing a tail of an echo response waveform and inserted between an output terminal of the sampler and a reception output terminal, a first transversal filter for generating a first canceling signal for canceling an echo signal sampled at equal sampling clock intervals after the echo signal passes through the filter, a second transversal filter for canceling a deviation of a sampling value obtained when sampling clock is jittered before the deviation passes through the filter, an enable/disable unit for enabling/disabling a tap output of the second transversal filter, and a controller for, from a moment at which the sampling clock is jittered, controlling the enable/disable unit to cancel a deviation in correspondence with a deviation value of an actual sampling value.

REFERENCES:
patent: 4695998 (1987-09-01), Schollmeier et al.
"Clock Sensitivity Reduction in Echo Cancellers," Electronics Letters, S. A. Cox, 7-4-85; vol. 21, No. 14, pp. 585-586.

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