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Acoustic analysis of speech under stress
Savita Sondhi1, Munna Khan2, Ritu Vijay3
11 Department of Electrical, Electronics & Communication Engineering, ITM University, Gurgaon 122017, Haryana, India.
International Journal of Bioinformatics Research and Applications
|November 13, 2015
Summary
This study shows that vocal stress detection is possible by analyzing voice acoustics. Elevated fundamental frequency (F0) and reduced formant frequencies indicate psycho-physiological stress during conversations.
Area of Science:
- Acoustic Phonetics
- Psycho-physiology
- Speech Analysis
Background:
- Emotional states, particularly stress, manifest audibly in human speech.
- Detecting psycho-physiological stress through voice analysis offers a non-invasive monitoring method.
Purpose of the Study:
- To present a simplified, non-invasive approach for detecting psycho-physiological stress via acoustic voice modifications.
- To analyze vocal changes during stressful conversations using established acoustic parameters.
Main Methods:
- Utilized audio clips from real-life stressful conversations sourced from FM broadcasts.
- Employed PRAAT software for acoustic analysis, focusing on mean fundamental frequency (F0) and formant frequencies (F1-F4).
- Compared Fourier and chirp spectra of vowel segments in neutral and stressed speech.
Main Results:
- Fundamental frequency (F0) showed an increase with heightened stress levels.
- Formant frequencies (F1-F4) exhibited a decrease correlated with increased stress.
- Spectra analysis revealed differences in the high-frequency range for stressed speech due to pitch modulation.
Conclusions:
- Acoustic analysis of voice provides a viable method for detecting psycho-physiological stress.
- Specific vocal parameters like F0 and formant frequencies serve as reliable indicators of stress.
- The non-invasive approach using real-life stressful conversations demonstrates practical application potential.
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