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An interval scale for contribution of acoustic properties to perception of speaker identity was measured according to Thurstone paired-comparison methodology. In the experiments, several acoustic properties of sus- tained vowel /a/ uttered by 10 male speakers were modified and those effects on perception of closeness of speaker characteristics were investigated. An interval scale for sound quality of the stimuli was also measured in order to confirm whether the degradation of sound quality affects the results. The results showed that the order of perceptual contribution is speech spectra in higher frequency region, the frequency properties of the glottal source, the mean of the pitch frequency and time-pattern of the amplitude and pitch frequency in decreasing order representing the smaller intra-speaker variation of the properties the more important to perception of speaker identity. However, there is a strong positive correlation between interval scales of closeness of speaker characteristics and sound quality of the stimuli implying that sound quality might affect to the experimental results.

Effects of acoustic modification on perception of speaker characteristics for sustained vowels