Apparatus and method for controlling an echo canceler

Details Apparatus and method for controlling an echo canceler Apparatus and method for controlling an echo canceler

1992-10-23

1994-07-05

Dwyer, James L.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379406, 379407, 370 321, H04M 900

Patent

active

053274954

ABSTRACT:
An echo canceler (10) is controlled and operated during hangover time between a double talk condition and a single talk condition for a more natural residual echo cancellation. The adaptive gain and the residual suppression threshold necessary for controlling an adaptive filter and a residual echo suppressor, respectively, are computed such that their respective values increase gradually and smoothly from predetermined minimum values to predetermined maximum values during the hangover time.

REFERENCES:
patent: 4679230 (1987-07-01), Lassaux et al.
patent: 4897832 (1990-01-01), Suzuki et al.
patent: 4998241 (1991-03-01), Brox et al.
CCITT Recommendation, Echo Cancellers, Fascicle III.1--Rec. G.165, Geneva, 1980, pp. 258-279.
Thomas L. Barto, New Considerations for Echo Control in the Evolving Worldwide Telecommunications Network, Tellabs, Inc., 2.6.
David G. Messerschmitt, Echo Cancellation in Speech and Data Transmission, IEEE Journal on Selected Areas in Communications, vol. SAC-2, No. 2, Mar. 1984, pp. 283-297.

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