公开(公告)号：US10425734B2

公开(公告)日：2019-09-24

申请号：US16151515

申请日：2018-10-04

Applicant: Panasonic Intellectual Property Corporation of America

Inventor： Hiroyuki Kano

IPC: H04R3/04 ,  G01G19/44 ,  G10L21/0208 ,  G10K11/178

Abstract: Disclosed is a noise control apparatus which reduces noise at a position away from a head of a passenger in a seat in a room under a noisy environment created by a noise source. The apparatus includes: a weight sensor, and control speakers installed in the seat; a noise detector which detects the noise from the noise source, and outputs a noise signal; a control circuit which obtains the noise signal, and outputs a control signal for reducing the noise to the speakers; and a memory which stores control coefficients each used to generate the control signal for reducing the noise at a position which becomes higher from the seat as the corresponding weight becomes heavier. The circuit reads a coefficient corresponding to a detected weight or a correlation value from the coefficients, and outputs the control signal generated using the noise signal and the read coefficient to the speakers.

公开(公告)号：US10891937B2

公开(公告)日：2021-01-12

申请号：US16658362

申请日：2019-10-21

Applicant: PANASONIC INTELLECTUAL PROPERTY CORPORATION OF AMERICA

Inventor： Hiroyuki Kano

IPC: G10K11/178

Abstract: A noise controller includes: a noise detector; a control filter that performs signal processing on a noise signal using a control factor; a speaker that reproduces an output signal from the control filter; an error microphone that detects a residual noise at a control point; a transmission characteristics correction filter that performs signal processing on the noise signal, using characteristics of sound transmission from the speaker to the error microphone; a factor updater that updates the control factor; a correction filter that performs signal processing on an output signal from the control filter, using the characteristics of sound transmission; a subtractor that subtracts, from an error signal indicative of the residue noise, an output signal from the correction filter; and an effect measuring unit that measures a noise reduction effect at the control point based on a difference between an output signal from the subtractor and the error signal.