Patent ID: 7453963

Claim:
A method of canceling a sinusoidal disturbance of unknown frequency in a disturbed useful signal, comprising the steps of: (a) estimating parameters of the sinusoidal disturbance, including an amplitude, a phase and a frequency; (b) generating a reference signal on the basis of the estimated parameters; and (c) subtracting the reference signal from the disturbed useful signal; wherein the disturbed useful signal is band-pass filtered before estimating the parameters of the sinusoidal disturbance; and wherein the disturbed useful signal is decomposed into one or more bands by one or more band-pass filters prior to performing steps (a)-(c) to each band; wherein generating a reference signal comprises: generating a reference signal for a first band; and further generating a reference signal for a second band by adapting the reference signal generated in the first band to a ratio of a first band frequency response to a second band frequency response.