Estimation and Statistical Analysis of Physical Task Stress on Human Speech Signal
Salon, Rajiv Kumar Sharma, Anil Kumar Gupta · International Journal of Image Graphics and Signal Processing · 2016
Human speech signal is an acoustic wave, which conveys the information about the words or message being spoken, identity of the speaker, language spoken, the presence and type of speech pathologies, the physical and emotional state of the speaker.Speech under physical task stress shows variations from the speech in neutral state and thus degrades the speech system performance.In this paper we have characterized the voice samples under physical stress and the acoustic parameters are compared with the neutral state voice parameters.The traditional voice measures, glottal flow parameters, mel frequency cepstrum coefficients and energy in various frequency bands are used for this characterization.T-test is performed to check the statistical significance of parameters.Significant variations are noticed in the parameters under two states.Pitch, intensity, energy values are high for the physically stressed voice; On the other hand glottal parameter values get decreased.Cepstrum coefficients shift up from the coefficients of neutral state voice samples.Energy in lower frequency bands was more sensitive to physical stress.This study improves the performance of various speech processing applications by analyzing the unwanted effect of physical stress in voice.