Robust Detection of Glottal Activity Using Unwrapped Phase Electroglottographic Signal

Abstract

Glottal Activity is defined by the process of exciting the vocal tract system by the vibration of the vocal folds during speech processing. Detection of glottal activity refers to identifying the glottal instants present within a glottal cycle. GCI and GOI are the two important glottal instants of a glottal cycle. The DEGG signal provides significant peaks at those instants for normal voicing, but they are prone to error in detection for low strength EGG signal. In this paper, we mainly focus on the segments of EGG signal where the strength of the EGG signal is very poor and irregular in periodicity. The robust detection of the glottal instants in those segments of EGG signal will enhance the overall accuracy of the detection of glottal instants. In the proposed method, the unwrapped phase of the EGG signal has been used for the detection of the glottal instants. The phase of the signal has uniform characteristics throughout the signal which helps to detect the glottal instants robustly.