2019 年 40 巻 3 号 p. 162-169
Recent work has shown that phase information is useful for further improving the performance of speech enhancement, source separation, and speech synthesis. In the speech enhancement field, the combination of amplitude and phase estimations improves the perceived quality more than only amplitude estimation. In this paper, we review two harmonic-structure-based phase estimation methods with temporal and frequency constraints on the harmonic speech phase. In addition, we describe important parameters for phase estimation, such as the frame shift length and window function of the short-time Fourier transform. Subjective experiments using listening tests and future work for phase processing are briefly described.
