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Auditory feedback plays an essential role in the regulation of thefundamental frequency of voiced sounds. The fundamental frequency also respondsto auditory stimulation other than the speaker's voice. We propose to use thisresponse of the fundamental frequency of sustained vowels tofrequency-modulated test signals for investigating involuntary control of voicepitch. This involuntary response is difficult to identify and isolate by theconventional paradigm, which uses step-shaped pitch perturbation. We recentlydeveloped a versatile measurement method using a mixture of orthogonalsequences made from a set of extended time-stretched pulses (TSP). In thisarticle, we extended our approach and designed a set of test signals using themixture to modulate the fundamental frequency of artificial signals. Fortesting the response, the experimenter presents the modulated signal aurallywhile the subject is voicing sustained vowels. We developed a tool forconducting this test quickly and interactively. We make the tool available asan open-source and also provide executable GUI-based applications. Preliminarytests revealed that the proposed method consistently provides compensatoryresponses with about 100 ms latency, representing involuntary control. Finally,we discuss future applications of the proposed method for objective andnon-invasive auditory response measurements.

cornell university

Mixture of orthogonal sequences made from extended time-stretched pulses  enables measurement of involuntary voice fundamental frequency response to  pitch perturbation