Acoustic analysis of speech under stress

When a person is emotionally charged, stress could be discerned in his voice. This paper presents a simplified and a non-invasive approach to detect psycho-physiological stress by monitoring the acoustic modifications during a stressful conversation. Voice database consists of audio clips from eight...

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Bibliographic Details
Published in:International journal of bioinformatics research and applications Vol. 11; no. 5; p. 417
Main Authors: Sondhi, Savita, Khan, Munna, Vijay, Ritu, Salhan, Ashok K, Chouhan, Satish
Format: Journal Article
Language:English
Published: Switzerland 2015
Subjects:
formant frequency
stressed speech
stressful conversation
FFT
chirp transform
bioinformatics
pitch modulation
acoustic analysis
voice stress analysis
fundamental frequency
emotional stress
psycho-physiological stress
ISSN:1744-5485
Online Access:Get more information
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Summary:When a person is emotionally charged, stress could be discerned in his voice. This paper presents a simplified and a non-invasive approach to detect psycho-physiological stress by monitoring the acoustic modifications during a stressful conversation. Voice database consists of audio clips from eight different popular FM broadcasts wherein the host of the show vexes the subjects who are otherwise unaware of the charade. The audio clips are obtained from real-life stressful conversations (no simulated emotions). Analysis is done using PRAAT software to evaluate mean fundamental frequency (F0) and formant frequencies (F1, F2, F3, F4) both in neutral and stressed state. Results suggest that F0 increases with stress; however, formant frequency decreases with stress. Comparison of Fourier and chirp spectra of short vowel segment shows that for relaxed speech, the two spectra are similar; however, for stressed speech, they differ in the high frequency range due to increased pitch modulation.
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ISSN:1744-5485
DOI:10.1504/IJBRA.2015.071942