HHT-based time-frequency analysis in voice rehabilitation
Chin‐Feng Lin, Hsiu‐Feng Chuang, Yung-Hsin Wang, Cheng-Hui Jian · 2010
This paper discusses the time-frequency characteristics of recorded human voice changes before and after rehabilitation by using Hilbert-Huang Transformation (HHT) analysis. In addition, the objective is to determine how the HHT time-frequency distributions of recorded human voice changes before and after rehabilitation and then to identify the physical basis for each type of change seen in the HHT-based concepts. The basic goal is to devise a distribution that represents the intrinsic mode functions of a voice rehabilitation signal simultaneously in time and frequency. We explain the differences in the intrinsic mode functions (IMFs) and instantaneous frequencies (IFs) before and after voice rehabilitation.