Analysis of stressed human speech

摘要

Stress is a condition in which the normal speech of a person is changed. It has been observed that stressed syllables are longer than unstressed ones. The investigation of the speaker's stress is based on specific changes in short-time spectrum of phonemes. Comparative results between the normal speech and stressful speech are achieved. In case of speech under stress, the obtained spectra differ towards the higher frequency due to enhanced pitch modulation observed in the envelope of the normal speech spectrum. In this work, a new database of speech under stress and normal condition consisting of data collected during the examination of final year students. Frequency domain analysis is most useful for speech processing and is done in this paper. It is observed that stress primarily affects vowel duration, whereas syllable final consonants have little stress variation and the durations typically differ 20%-40% between stressed and unstressed syllables.