公开(公告)号：US20200005760A1

公开(公告)日：2020-01-02

申请号：US16559660

申请日：2019-09-04

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： MASAFUMI TAO ,  TOMOFUMI YAMANASHI

IPC: G10K11/178

Abstract: An active noise reduction device includes a standard signal generator, an adaptive filter unit, a control sound output unit, and an error signal detector. The adaptive filter unit includes a control signal generator, a filter coefficient update unit, and a step size setting unit. The control signal generator multiplies a standard signal by a filter coefficient to generate a control signal. Based on a reference signal and an error signal, the filter coefficient update unit updates the filter coefficient so as to minimize the error signal. The step size determiner sets a step size parameter indicating an update amount of the filter coefficient. The filter coefficient update unit sets a step size adjustment coefficient for adjusting the step size parameter based on an audio information feature amount and a change of the control signal.