Centering device for a transverse filter of an echo canceller

Details Centering device for a transverse filter of an echo canceller Centering device for a transverse filter of an echo canceller

1975-06-27

1977-05-17

Cooper, William C.

H04B 320

Patent

active

040243575

ABSTRACT:
Centering device for an adjustable transverse filter of a digital echo canceller in a telephone network, in which said transverse filter produces samples of a synthetic echo signal y (t) deduced from N servo-controlled weights C representing the samples of the pulse-response of the echo path and deduced from the same number of samples X (T) of a signal x (t) in the reception line, and in which the N samples X (T) are delayed in a delay circuit ahead of said transverse filter, the delay time being given by the minor rank of said coefficients C lying above a threshold value, this minor rank being detected at the end of given convergence time of said transverse filter.

REFERENCES:
patent: 3721777 (1973-03-01), Thomas
patent: 3732410 (1973-05-01), MacKechnie
patent: 3735055 (1973-05-01), Thomas
patent: 3922505 (1975-11-01), Hoge

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