Statistical analysis of glottal pulses in speech under psychological stress

In this paper, the problem of speech signal under psychological stress is addressed. The investigation into the speaker´s stress is based on statistical analysis of glottal pulse derivative extracted from the vowel signals. A pitch synchronous selection of segments from the glottal pulse waveform is used. Selected segments are fixed in their maxima and overlaid. The generated distribution matrix is analysed using special cuts. A new database of speech under stress is created for use in our experiments consisting of data collected during oral final examinations at our university. The database contains read and conversational speech of 31 male speakers, both in neutral and in stressed state. The stress recognition rate in the speaker dependent binomial classification (stress/no stress) reaches 88%.