Subtractive cancellation of harmonic noise
AssigneeHonda Research Institute Europe GmbH
InventorsFrank Joublin, Martin Heckmann, Björn Schölling
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Abstract
A common problem in audio processing is that a useful signal is disturbed by one or more sinusoidal noises that should be suppressed. One embodiment of the invention provides a method of canceling a sinusoidal disturbance of unknown frequency in a disturbed useful signal. The method comprises the steps of estimating parameters of the sinusoidal disturbance including amplitude, phase and frequency; generating a reference signal on the basis of the estimated parameters; and subtracting the reference signal from the disturbed useful signal. According to one embodiment of the present invention, the estimation is performed by an Extended Kalman filter.
Claims13
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.
Dependencies are inferred from the claim text.