Prony法と準同形処理法とを用いた音声の分析

概要

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Prony's method is one of the convenient techniques for modeling voice data as a combination of exponentials. It can estimate the transfer function of ARMA models. However, in the parameter estimation based on Prony's method, the poles and zeros are often found out as unstable roots when the starting point of sampled data has not been appropriate. As the result, Prony's method cannot be applied to continuous analysis of speech. This paper proposes the following method to carry out the continuous analysis of speech waves using Prony's method: 1. The method first estimates the impulse response of vocal tract area from speech waves by using homomorphic analysis. It is assumed that the impulse response satisfies a minimum phase condition in the analysis. 2. Next, the transfer function of ARMA models can be calculated by applying Prony's method to the impulse response.
明治大学の論文