| 摘要 |
An object is to provide an automatic wind noise reducing circuit and an automatic wind noise reducing method, which are capable of coping with a multichanneling trend of audio signals, and improving performance as well as the degree of freedom in system design. Arithmetic units ( 26, 27, 28 ) obtain added signals of audio signals of audio channels excluding respective selected audio channels, which are selected so as to be different from each other. Arithmetic units ( 29, 30, 31 ) subtract respective added signals of the arithmetic units ( 26, 27, 28 ) from corresponding audio signals of the selected audio channels. The subtraction signals from the arithmetic units ( 29, 30, 31 ) are subjected to a band limit control and limited to a frequency band of a wind noise signal by LPFs ( 21, 23, 25 ). After level-controlling of the subtraction signals from the arithmetic units ( 29, 30, 31 ) which are limited to the wind noise signal band by variable level amplifiers ( 32, 33, 34 ), the subtraction signals are subtracted from respective audio signals of corresponding audio channels.
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