Patent ID: 7925504

Claim:
A signal removal method, wherein a signal removal device removes a signal arriving at sensors from a particular direction using signals from a plurality of sensors, comprising: removing, using a first beamformer of the signal removal device, a signal coming from a particular direction by steering a null to the particular direction using signals from said plurality of sensors; calculating a correction coefficient for correcting the gain of the spectrum of a signal output from one of said plurality of sensors according to the directivity characteristic of said first beamformer; correcting the gain of the spectrum of the signal from said one sensor by said calculated correction coefficient; and reducing an output signal spectrum of said first beamformer by said corrected signal spectrum, wherein said process of calculating the coefficient for correcting the gain of the spectrum of the signal includes calculating the correction coefficient such that the gain at a direction within a range of said particular direction matches said first beamformer.