Method of canceling echoes and echo canceler

Details Method of canceling echoes and echo canceler Method of canceling echoes and echo canceler

1997-01-08

1998-05-26

Hunter, Daniel S.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379345, 379406, 379411, H04M 908

Patent

active

057579067

ABSTRACT:
An artificial echo signal generator generates an artificial echo signal from received voice signal data stored in a first data memory and a presumed impulse response outputted from a tap coefficient updater. The artificial echo signal is subtracted from an echo signal from a four-wire/two-wire converter by a subtractor, which then outputs a remainder signal that is stored in a second data memory. An updating time controller determines and outputs an updating time based on the data stored in the second data memory. An updating element selector selects one time element of the updating time from the updating time controller. The tap coefficient updater updates the presumed impulse response so as to approach the impulse response of a true echo path at the selected time element, and outputs the updated presumed impulse response to the artificial echo signal generator.

REFERENCES:
patent: 5245561 (1993-09-01), Sugiyama et al.
patent: 5289539 (1994-02-01), Maruyama et al.
patent: 5327459 (1994-07-01), Hara et al.
patent: 5371789 (1994-12-01), Hirano
patent: 5390250 (1995-02-01), Janse et al.
patent: 5414766 (1995-05-01), Cannalire et al.
N. Furuya, et al., "Custom VLSI Echo Canceller", NEC Technical Journal, vol. 39, No. 2, Jan. 14, 1986, pp. 53-62.

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