Method for the adaptive control of a digital echo canceller in a

Details Method for the adaptive control of a digital echo canceller in a Method for the adaptive control of a digital echo canceller in a

1994-11-29

1997-07-15

Matar, Ahmad F.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379406, 379411, H04M 100

Patent

active

056490119

ABSTRACT:
The echo canceller digital filter is first set to zero. Then a test signal is sent through the down link to the echo canceller and the filter taps are adjusted until the echo signal in the up link to the echo canceller is less than a predetermined stored reference level. The test signal is then removed and the number of filter taps having signal samples nearing zero and/or the number of filter taps having significant signal samples is determined and thereafter the taps having non-significant signal samples are eliminated for making the echo canceller ready for operation.

REFERENCES:
patent: 4578544 (1986-03-01), Colin de Verdiere et al.
patent: 4593161 (1986-06-01), Desblache et al.
patent: 4823382 (1989-04-01), Martinez
patent: 4862449 (1989-08-01), Hoefkens et al.
patent: 5050160 (1991-09-01), Fuda
Dixieme Colloque sur le Traitement du Signal et ses Applications, 20-24 May 1985, Nice, France, vol. 2, pp. 577-582, C. Galand et al., "Methode d'Initialisation Rapide D'Un Annuleur D'Echo et Mis en Oeuvre Sur Processeur de Signal".

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