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

Claim 6:
7. The sound pick-up device according to claim 1, wherein
the adaptive filter includes
a first adaptive filter that generates, from a reference signal, a first estimated noise signal indicating a component of a noise signal contained in a first input signal acquired by a first microphone, and
a second adaptive filter that generates, from the reference signal, a second estimated noise signal indicating a component of a noise signal contained in a second input signal acquired by a second microphone different from the first microphone,
the signal generator includes
a first signal generator that generates a first noise elimination signal obtained by subtracting the first estimated noise signal from the first input signal, and
a second signal generator that generates a second noise elimination signal obtained by subtracting the second estimated noise signal from the second input signal,
the coefficient update unit includes
a first coefficient update unit that updates a filter coefficient of the first adaptive filter using the first noise elimination signal, and
a second coefficient update unit that updates a filter coefficient of the second adaptive filter using the second noise elimination signal, and
the identification unit may include
a first identification unit that identifies at least one signal sample position among a plurality of signal sample positions from a signal sample position where the first noise elimination signal has a maximum absolute value to a signal sample position where the first noise elimination signal has an absolute value that is largest at a predetermined order, and
a second identification unit that identifies at least one signal sample position among a plurality of signal sample positions from a signal sample position where the second noise elimination signal has a maximum absolute value to a signal sample position where the second noise elimination signal has an absolute value that is largest at a predetermined order.