SPEAKER RACE IDENTIFICATION FROM ACOUSTIC CUES IN THE VOCAL SIGNAL

One-second acoustic samples were extracted from the mid-portion of sus tained /a/ vowels produced by 50 black and 50 white adult males. Each vowel sample from a black subject was randomly paired with a sample fr om a white subject. From the tape-recorded samples alone, both expert and naive listeners could determine the race of the speaker with 60% a ccuracy. The accuracy of race identification was independent of the li stener's own race, sex, or listening experience. An acoustic analysis of the samples revealed that, although within ranges reported by previ ous studies of normal voices, the black speakers had greater frequency perturbation, significantly greater amplitude perturbation, and a sig nificantly lower harmonics-to-noise ratio than did the white speakers. The listeners were most successful in distinguishing voice pairs when the differences in vocal perturbation and additive noise were greates t and were least successful when such differences were minimal or abse nt. Because there were no significant differences in the mean fundamen tal frequency or formant structure of the voice samples, it is likely that the listeners relied on differences in spectral noise to discrimi nate the black and white speakers.