WIND NOISE REDUCTION CIRCUIT, WIND NOISE REDUCTION METHOD AND AUDIO-SIGNAL PROCESSING CIRCUIT USING THE SAME, AND ELECTRONIC APPARATUS

摘要

PROBLEM TO BE SOLVED: To reduce acoustic discomfort when wind noise is removed.;SOLUTION: A high-pass filter 110 removes low-frequency components of a first-channel audio signal and a second-channel audio signal. A control unit 130 detect the strength of wind noise on the basis of at least one of the first-channel audio signal and the second-channel audio signal, and increases the cut-off frequency of the high-pass filter as the detected strength is larger. In a region where the detected strength of the wind noise is smaller than a predetermined minimum value MIN, the control unit sets the cut-off frequency of the high-pass filter to a predetermined minimum frequency f_MIN, and gradually increases the cut-off frequency when the strength is larger than the minimum value MIN.;COPYRIGHT: (C)2014,JPO&INPIT