Zhao Sipei, Dabin Matthew, Cheng Eva, Qiu Xiaojun, Burnett Ian, Liu Jacob Chia-Chun
School and Engineering, RMIT University, Melbourne, Australia.
Centre for Audio, Acoustics and Vibration, Faculty of Engineering and Information Technology, University of Technology Sydney, Sydney, Australia.
J Acoust Soc Am. 2018 Dec;144(6):3211. doi: 10.1121/1.5082290.
This paper utilizes a rigid spherical microphone array to reduce wind noise. In the experiments conducted, a loudspeaker is used to reproduce the desired sound signal and an axial fan is employed to generate wind noise in an anechoic chamber. The sound signal and wind noise are measured separately with the spherical microphone array and analyzed in the spherical harmonic domain. The wind noise is found to be irregularly distributed in the spherical harmonic domain, distinct from the sound signal which is concentrated in the first few spherical harmonic modes. This difference is utilized to reduce wind noise without degrading the desired sound pressure level (SPL) by use of a low pass filter method in the spherical harmonic domain. Experimental results with both single-tonal and multi-tonal sound signals demonstrate that the proposed method can reduce wind noise by more than 10 dB in the frequency range below 500 Hz. The SPL of the desired sound signal can be extracted from wind noise with an error within 1.0 dB, even when the sound level is 8 dB lower than wind noise.
本文利用刚性球形麦克风阵列来降低风噪声。在进行的实验中，使用扬声器来再现所需的声音信号，并使用轴流风扇在消声室内产生风噪声。声音信号和风噪声通过球形麦克风阵列分别进行测量，并在球谐域中进行分析。发现风噪声在球谐域中分布不规则，这与集中在前几个球谐模式中的声音信号不同。利用这种差异，通过在球谐域中使用低通滤波方法来降低风噪声，而不会降低所需的声压级（SPL）。单音和多音声音信号的实验结果表明，所提出的方法在低于500Hz的频率范围内可以将风噪声降低超过10dB。即使声音电平比风噪声低8dB，所需声音信号的SPL也可以从风噪声中提取，误差在1.0dB以内。
