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Journal of Speech and Hearing Research Vol.35 562-573 June 1992.
© American Speech-Language-Hearing Association
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Vocal Tremor Analysis With the Vocal Demodulator

William S. Winholtz 1
Lorraine Olson Ramig 2
1 Recording and Research Center Denver, CO
2 Department of Communication Disorders and Speech Science University of Colorado-Boulder, and Recording and Research Center Denver, CO

Acoustic analysis of vocal tremor has the potential to make significant quantitative and diagnostic contributions to the study of vocal disorders. This paper presents a new device for analysis of vocal tremor. The Vocal Demodulator produces amplitude- and frequency-demodulated outputs and measures the frequency and level (percent) of low-frequency tremor components in sustained phonation. A standard microphone is used to transduce the voice signal for input to the demodulator. The input fundamental frequency (Fo) range is 70–1200 Hz, and frequency response of the amplitude and frequency demodulation is 2.5–25 Hz. Five parameters are displayed in real time: Fo, amplitude-modulation frequency, amplitude-modulation level, frequency-modulation frequency, and frequency-modulation level. Validation, calibration, and reliability data from synthesized test signals with modulation, as well as phonation from subjects with vocal tremor, subjects producing vibrato, and subjects with normal voice are presented. Research and clinical applications of this device are suggested.

KEY WORDS: modulation, tremor, vibrato, instrumentation

Submitted on February 4, 1991
Accepted on September 23, 1991


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