Influence of Psychological Stress on Formant Structure of Vowels
Keywords: Speech processing, spectral analysis, frequency estimation, speech analysis
AbstractThis paper deals with speech signal under psychological stress. The investigation into the speaker’s stress is based on statistical analysis of smooth vowel spectra. In total, fifteen features based on formants, antiformants and inflexion points of spectral envelope were analysed and evaluated. The most effective features for stress detection across all speakers were as follows: frequency of the second formant of /a/, frequency of the first formant of /i/, and lower part of bandwidth of the third formant of /u/ and /a/. The results indicate that speakers tend to follow an individual trend and speaker dependent stress recognition might be more appropriate.
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