Multi-channel echo cancellation with adaptive filters having sel

Details Multi-channel echo cancellation with adaptive filters having sel Multi-channel echo cancellation with adaptive filters having sel

1993-02-01

1994-12-06

Dwyer, James L.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379411, 370 321, H04B 323

Patent

active

053717899

ABSTRACT:
A multi-channel echo canceller comprises a set of subtractors connected respectively in communication channels for respectively receiving a signal from a respective microphone and cancelling an echo contained in it with a cancelling signal, and a set of adaptive filters associated respectively with the subtractors. Each adaptive filter has a set of vectors of filter coefficients. A time difference between propagation delays of the received signals is estimated, and a signal having the largest content of echo components is selected and applied to the adaptive filters. One of coefficient vectors is identified according to the estimated time difference and the selected signal. Each adaptive filter varies its filter coefficients of the identified vector with a correction term proportional to the output of the associated subtractor for filtering the selected signal using the coefficients of the identified vector to derive an echo replica, which is supplied to the associated subtractor as the cancelling signal.

REFERENCES:
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patent: 4609787 (1986-09-01), Horna
patent: 4862449 (1989-08-01), Hoefkens et al.
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patent: 4947425 (1990-08-01), Grizmala et al.
patent: 4956838 (1990-09-01), Gilloire et al.
patent: 5018134 (1991-05-01), Kokubo et al.
Hirano et al., "A Compact Multi-Channel Echo Canceller with a Single Adaptive Filter Per Channel," IEEE International Symposium on Circuits and Systems, pp. 1922-1925 (1992).

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