Patent ID: 9402130
Filing Date: 2016-07-26
CPC Classification: H04R

Claim Text:
1. A wind noise reducing circuit configured to receive a first channel audio signal acquired via a first channel microphone and a second channel audio signal acquired via a second channel microphone, the wind noise reducing circuit comprising: a high-pass filter configured to reduce a low-frequency component of the first channel audio signal and a low-frequency component of the second channel audio signal; and a control circuit configured to detect a wind noise magnitude based on at least one from among the first channel audio signal and the second channel audio signal, and to raise a cutoff frequency of the high-pass filter according to an increase in the wind noise magnitude thus detected, wherein the control circuit is configured to set the cutoff frequency of the high-pass filter to a predetermined minimum frequency f and wherein the control circuit is configured to gradually raise the cutoff frequency when the wind noise magnitude becomes greater than the minimum value MIN, and a slope of the cutoff frequency gradually increases and subsequently gradually decreases with increasing the wind noise magnitude, and wherein the control circuit comprises a detection subtractor structured to generate a difference component of the first channel audio signal and the second channel audio signal, and to detect the wind noise magnitude based on the difference component thus generated.