This paper describes the Vocal Demodulator as a new device for analysis of vocal tremor. The Vocal Demodulator produces amplitude-demodulated and frequency-demodulated outputs and measures the frequency and level of low-frequency tremor components in sustained phonation. The paper describes quantification of the demodulation process, validation…

This study evaluated the voiced/voiceless phonation time for /s/ and /z/ for 11 children (ages 5-10) with vocal pathology and 11 normal speaking children. Results showed no difference in /s/ durations between groups, but /z/ durations and s/z ratios were significantly different. Results are discussed in relation to task construction, instructional…

This study analyzed production of a long vowel sound within Finnish words by normal or dysphonic voices, using the Self-Organizing Map, the artificial neural network algorithm of T. Kohonen which produces two-dimensional representations of speech. The method was found to be both sensitive and specific in the detection of dysphonia. (Author/JDD)