音環境の特定騒音評価に対する瞬時信号対雑音比の導入

概要

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The usual engineering idea of signal-to-noise ratio is defined by using only representative quantities like a peak value and/or an averaged value for two kinds of random phenomena. But it is not sufficient to grasp the whole information on its variety of randomness. Scarcely, the effect of the background noise to the specific noise was systematically discussed in a dynamical expansion form of the momentary signal-to-noise ratio. In this paper, as one of new trials of introducing this idea, an explicit expression for the probability density function of the momentary signal-to-noise ratio is theoretically derived in a general expansion form from two different points of view. The validity and effectiveness of the proposed method are confirmed by applying it to the experimental model consisting of two different noises.
社団法人日本音響学会の論文