System for rapid convergence of an adaptive filter in the generation of a time variant signal for cancellation of a primary signal

摘要

System for generating a secondary signal (y.sub.s (k)) for suppression of a primary signal (y.sub.p (k)), having:PP means (8) for generating a reference signal ((k)):PP a control unit (1) having a digital filter for providing a cancellation control signal (s(k));PPcancellation-generating means (2) for generating a secondary signal (y.sub.s (k));PPsensor means (4) for providing an error signal ((k)),PP update means (5) for providing an update signal (up(k));PP an adaptation unit (7) for supplying a filtered-x signal (r(k)) to the update means (5);PPmeans for updating filter coefficients (.sub.c,v (k)) of the filter in the control unit (1) with the aid of the so-called "projection algorithm" andPPthe various features being such that an input correlation matrix defined according to equation 17 has an eigenvalue distribution which has a value which is at least substantially identical to 1 after as few steps as possible.