Patent ID: 7174023
Filing Date: 2007-02-06
Classification: H04R

Abstract:
1. An automatic wind noise reducing circuit, characterized by comprising: N number of audio channels (N is a positive integer equal to or greater than two); first adder means for adding all of audio signals of N−1 number of audio channels, excluding one audio channel which is selected from the N number of audio channels; first subtracting means for subtracting an added signal of the first adder means from an audio signal of the selected one of the audio channels, which is not added in the first adder means; first extracting means for extracting a frequency band component of a wind noise signal with respect to each of the audio signals of the N number of audio channels in a preceding stage of the first adder means and the first subtracting means, or, with respect to an output signal from the first subtracting means in a subsequent stage of the first subtracting means; first gain control means for controlling a gain of an output signal from the first subtracting means, whose output signal is band-limited by the first extraction means; and second subtracting means for subtracting a signal, whose gain is controlled by the first gain control means, from the audio signal of the selected one of the audio channels, wherein an output signal from the second subtracting means is set as an audio output of the selected one of the audio channels.