Echo canceller adaptation technique

Details Echo canceller adaptation technique Echo canceller adaptation technique

1996-12-09

1998-09-08

Zele, Krista

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379406, 379410, 36472419, 36472402, 381 66, H04M 100, G06F 1710, H04B 320

Patent

active

058056963

ABSTRACT:
A device for providing conferencing communications. The device comprises: a summing circuit for forming a signal sum equal to a sum of signals received from at least three information signal sources along with an echo compensation signal, the signal received from each information source including echoes and the signal sum including an aggregation of such echoes; an adaptive filter having an input and an output, the input being solely responsive to the signal sum and the output being only coupled to the summing circuit, the filter forming the echo compensation signal which is an estimate of the aggregation of echoes; and a low level training sequence generator having an amplitude less than a predetermined level. The adaptive filter has coefficients whose respective values are varied in response to a training sequence comprising a plurality of a priori known values supplied by the low level training sequence generator and the predetermined level is below that of the signal received from the each information source.

REFERENCES:
patent: 5027393 (1991-06-01), Yamamura et al.
patent: 5363441 (1994-11-01), Feiner et al.
patent: 5428604 (1995-06-01), Fuda

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