| 摘要 |
PROBLEM TO BE SOLVED: To provide a wind noise reduction device which prevents a malfunction by a wind noise of an in-phase component upon wind noise reduction processing and which increases a reduction effect. SOLUTION: FFT portions 52 and 53 convert input signals from a plurality of voice channels into frequency signals, and take out a frequency signal of a wind noise bandwidth. An amplitude comparison portion 54 and a phase comparison portion 55 obtain a difference between the voice channels from both an amplitude and a phase. An attenuation coefficient generating portion 56 converts it into an amplitude coefficient for attenuating wind noise components. Frequency selection/attenuation portions 57 and 58 select one coefficient of the amplitude and the phase, and multiply the coefficient by the frequency signal of the wind noise bandwidth. Bandwidth synthesizing portions 59 and 60 synthesize the resulting signal with the frequency signal other than the wind noise bandwidth, and IFFT portions 61 and 62 inverse-convert the frequency signal into a time signal. COPYRIGHT: (C)2010,JPO&INPIT |
