因果律に基づく新たな信号処理法を用いた遅延時間推定法

概要

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We present a new method for measuring delay time and acoustical properties of sound reflection systems. In this method, the system is assumed as a minimum-phase system with delay, and is described as a discrete causal system. Since the causality of the system is defined differently between the real system and the discrete system, we must transform the frequency characteristics of the former to those of the latter. To do this properly, we propose a new extrapolation technique. The total frequency characteristics are extrapolated from the band limited measured data so as to satisfy the causality described in a discrete way. Thus, we can use the discrete Hilbert transform relation between real and imaginary parts, and also between the log magnitude and the phase, of the frequency characteristics of the sound reflection system. Using this method, we can estimate the frequency characteristics of the sound reflecting material as well as the delay time of sound reflection.
産業技術大学院大学の論文