Subtractive cancellation of harmonic noise
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United States of America Patent
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Nov 18, 2008
Grant Date -
Dec 15, 2005
app pub date -
May 25, 2005
filing date -
May 26, 2004
priority date (Note) -
Expired
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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.
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