System, method, device, and program for removing one or more signals incoming from one or more directions

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;
• deriving a signal spectrum from the signals from the plurality of sensors using a second beamformer that forms a second directivity characteristic different from a first directivity characteristic of said first beamformer;
• calculating a correction coefficient for correcting the gain of the spectrum of a signal output from said second beamformer according to said first directivity characteristic and said second directivity characteristic;
• correcting the spectrum of the signal output from said second beamformer by said calculated correction coefficient;
• and
• reducing an output signal spectrum of said first beamformer by said corrected output signal spectrum of said second beamformer,
• 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.

A signal removal device, which removes a signal arriving at sensors from a particular direction using signals from a plurality of sensors, comprising:

• a first beamformer that removes a signal coming from a particular direction by steering a null to the particular direction using signals from said plurality of sensors;
• a coefficient calculation unit that calculates a 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;
• a gain correction unit that corrects the spectrum of the signal from said one sensor by said calculated correction coefficient;
• and
• a spectrum correction unit that reduces an output signal spectrum of said first beamformer by said corrected sensor signal spectrum,
• wherein said coefficient calculation unit calculates the correction coefficient such that the gain at a direction within a range of said particular direction matches said first beamformer.

A signal removal device, which removes a signal arriving at sensors from a particular direction using signals from a plurality of sensors, comprising:

• a first beamformer that removes a signal coming from a particular direction by steering a null to the particular direction using signals from said plurality of sensors;
• a second beamformer that forms a second directivity characteristic different from a first directivity characteristic of said first beamformer;
• a coefficient calculation unit that calculates a coefficient for correcting the gain of the spectrum of a signal output from said second beamformer according to said first directivity characteristic and said second directivity characteristic;
• a gain correction unit that corrects the spectrum of the signal outputted from said second beamformer by said calculated correction coefficient;
• and
• a spectrum correction unit that reduces an output signal spectrum of said first beamformer by said corrected output signal spectrum of said second beamformer,
• wherein said coefficient calculation unit calculates the correction coefficient such that the gain at a direction within a range of said particular direction matches said first beamformer.

An article of manufacture including a non-transitory computer-readable medium having instructions stored thereon that, if executed by a computing device, cause the computing device to perform operations comprising:

• causing a first beamformer to remove a signal coming from a particular direction by steering a null to the particular direction using signals from a plurality of sensors;
• calculating a 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.

An article of manufacture including a non-transitory computer-readable medium having instructions stored thereon that, if executed by a computing device, cause the computing device to perform operations comprising:

• causing a first beamformer to remove a signal coming from a particular direction by steering a null to the particular direction using signals from a plurality of sensors;
• deriving a signal spectrum from the sensor signals of said plurality of sensors using a second beamformer that forms the second directivity characteristic different from a first directivity characteristic of said first beamformer;
• calculating a coefficient for correcting the gain of the spectrum of a signal output from said second beamformer according to said first directivity characteristic and said second directivity characteristic;
• correcting the spectrum of the signal output from said second beamformer by said calculated correction coefficient;
• and
• reducing an output signal spectrum of said first beamformer by said corrected output signal spectrum of said second beamformer,
• 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.