Method and echo canceller for echo cancellation with a number of

Details Method and echo canceller for echo cancellation with a number of Method and echo canceller for echo cancellation with a number of

1994-05-13

1995-06-27

Marcelo, Melvin

Multiplex communications

Wide area network

Packet switching

375232, 379410, H04B 323

Patent

active

054286050

ABSTRACT:
Echo-cancellation with the aid of a number of cascade-connected adaptive filters, wherein each filter forms an output signal for cancelling its respective part of an echo signal appearing on a line included in a four-wire loop. The filters will preferably be able to converge rapidly, at least for relatively short impulse responses, and to provide effective echo-cancellation for different kinds of impulse response. Those filters which are required for the echo cancellation at that moment in time are ascertained by calculating a special quality measurement for each filter. There is formed an echo-reduced signal which is equal to the difference between the original, echo-included signal and the sum of the output signals from those filters that are needed for the echo-cancellation. These filters are updated with the echo-reduced signal, whereas the remainder of the filters are updated with signals formed as the difference between the echo-reduced signal and the output signal of respective filters.

REFERENCES:
patent: 4574166 (1986-03-01), Gritton
patent: 4956838 (1990-09-01), Gilloire et al.
patent: 4965823 (1990-10-01), Nakagawa et al.
patent: 4972467 (1990-11-01), Nakagawa et al.
patent: 5189637 (1993-02-01), Eriksson
Patent Abstracts of Japan, 60-5634.
Patent Abstracts of Japan, 1-129623.
Patent Abstracts of Japan, 62-51836.
IBM Technical Disclosure Bulletin, vol. 31, No. 10, Mar. 1989, pp. 157-158.

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