風雑音混入下の低周波音推定に対する風速利用の一簡易的方法

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This paper describes a new and simplified method for estimating exclusively objective acoustic signal levels where the observation of the signals with microphones is inevitably disturbed by wind-induced noise in the outdoor measurement of low-frequency sounds. The estimation method in the frequency domain is discussed using the information on wind speed observed in the vicinity of a microphone, mainly from an experimetal viewpoint. Concretely, the power spectrum of the wind noise and that of the observed sound (composed of objective signal and wind noise) are first expressed in the form of probability distribution conditioned by the wind speed. Next, a simplified method is shown for estimating the objective signal through a spectrum estimation procedure employing the conditional means of these power spectra. The method is supported by the fundamental additive property of power spectra based on the statistical independence of the signal and the noise. The effefctiveness of the proposed method is finally discussed and shown through the measurement of an objective signal of band noise with the wind speed under breezy conditions.
社団法人日本音響学会の論文