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Subjective and objective experiments are conducted to understand the extentto which a speaker's gender influences the acoustics of unvoiced (U) sounds. Usegments of utterances are replaced by the corresponding segments of a speakerof opposite gender to prepare modified utterances. Humans are asked to judge ifthe modified utterance is spoken by one or two speakers. The experiments showthat human subjects are unable to distinguish the modified from the original.Thus, listeners are able to identify the U segments irrespective of the gender,which may be based on some speaker-independent invariant acoustic cues. To testif this finding is purely a perceptual phenomenon, objective experiments arealso conducted. Gender specific HMM based phoneme recognition systems aretrained using the TIMIT training set and tested on (a) utterances spoken by thesame gender (b) utterances spoken by the opposite gender and (c) the modifiedutterances of the test set. As expected, the performance is the highest forcase (a) and the lowest for case (b). The performance degrades only slightlyfor case (c). This result shows that the speaker's gender does not as stronglyinfluence the acoustics of U sounds as they do the voiced sounds.

Subjective and objective experiments on the influence of speaker's gender on the unvoiced segments