Adaptive sinusoidal disturbance rejection in linear discrete-time systems - part II: Experiments

The problem of adaptive noise cancellation in an acoustic duct is discussed . An adaptive controller design approach based on parametrizing the set of stabilizing controllers using the Youla parametrization and timing the Youl a parameter to achieve regulation wets presented in a companion paper [3]. Three controller adaptation algorithms are implemented to solve the noise c ancellation problem in an acoustic duct The experimental results indicate a mixed performance for each of the adaptation algorithms, with good perform ances observed only in some frequency ranges. The discrepancy between the e xpected and the observed performances is attributed to unmodeled nonlineari ties in the speakers.