Patent ID: 11967304
Assignee: PANASONIC INTELLECTUAL PROPERTY CORPORATION OF AMERICA
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 7:
8. A sound pick-up method for a sound pick-up device including an adaptive filter, a signal generator, a coefficient update unit, and an identification unit, the sound pick-up method comprising the steps of:
causing the adaptive filter to generate, from a reference signal, an estimated noise signal indicating a component of a noise signal contained in an input signal acquired by a microphone;
causing the signal generator to generate a noise elimination signal obtained by subtracting the estimated noise signal from the input signal;
causing the identification unit to identify at least one signal sample position among a plurality of signal sample positions from a signal sample position where the noise elimination signal has a maximum absolute value to a signal sample position where the noise elimination signal has an absolute value that is largest at a predetermined order; and
causing the coefficient update unit to update a filter coefficient of the adaptive filter using the noise elimination signal at the identified at least one signal sample position.