Automatic wind noise reduction circuit and automatic wind...

Details Automatic wind noise reduction circuit and automatic wind... Automatic wind noise reduction circuit and automatic wind...

2007-02-06

2007-02-06

Chin, Vivian (Department: 2615)

Electrical audio signal processing systems and devices

Noise or distortion suppression

C381S094200, C381S094700

Reexamination Certificate

active

10525112

ABSTRACT:
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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