Process for computing the coefficients of an adaptive filter in

Details Process for computing the coefficients of an adaptive filter in Process for computing the coefficients of an adaptive filter in

1997-03-31

1999-02-16

Malzahn, David H.

Boots, shoes, and leggings

455307, G06F 1710

Patent

active

058727280

ABSTRACT:
A process for computing the coefficients C(i) of an adaptive filter (206) used in an echo-cancellation structure for a telecommunication apparatus. The process is based on the Least Mean Squared (L.M.S.) or gradient algorithm for computing the coefficients of the filter in accordance with the formula: ##EQU1## where e(i) is the estimation error and .alpha. is the step size used for performing an adjustement of the convergence of the filtering process. The process uses two different estimations of the power of the analog signal, a former short-term estimation and a latter long-term estimation in order to derive the appropriate value of the stepsize .alpha. which is used for computing the new coefficients. In the preferred embodiment the value of .alpha. is determined by dividing a constant .alpha..sub.0 being slightly lower than the maximum value ensuring stability of the convergence process by the greater of the two different estimations of the power of the analog signals.

REFERENCES:
patent: 4789994 (1988-12-01), Randall
patent: 5390364 (1995-02-01), Webster et al.
patent: 5615233 (1997-03-01), Baum et al.

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