A study on real time pitch alteration of speech signal

Abstract

In this paper, we propose the pitch alteration method with the high-quality in the time domain by preserved the phase information for minimizing the spectrum distortion ratio and reducing the computation. It is required to maintain the integer multiple of formant and fundamental frequency for minimizing the spectrum distortion ratio according to the pitch alteration. In the result, the proposed method can be obtained the improving spectrum distortion ratio of 0.73% than the existed method about the entire pitch alteration ratio and obtained the improving spectrum distortion ratio of 2.18% than the existed method in pitch compression. The proposed pitch alteration method can be preserved the phase information and for minimizing the spectrum distortion ratio than the existed method. Also the proposed pitch alteration method by using the proposed pitch point detection is obtained the result of having not must difference than the method by eye detection.