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The “Nyquist plot” is a visual analytical method we previously developed for identifying various pathological glottal conditions when applied to high-speed digital imaging (HSDI) derived glottal signals and acoustic signals. In this study, we applied the Nyquist plot to acoustic voice output aiming to: 1) identify differences between the properties of five vowel sounds commonly used in human language,...
This paper presents a Hilbert transform-based approach to analyze vocal fold vibrations in human subjects exhibiting normal and abnormal voice productions. This new approach is applied to the analysis of glottal area waveform (GAW) and is capable of providing useful information on the vocal fold vibration. The GAW is extracted from high-speed laryngeal images by delineating the glottal edge for each...
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