Quantitative Spectral Evaluation of Shimmer and Jitter A vowel [a]-like, synthesized speech wave was perturbated by defined and comparable jitter and shimmer levels. The signal-to-noise ratio was calculated from the speech wave spectra. Noise emerges in those spectral regions in which the harmonics have high amplitudes, that is, at low frequencies and in the formant regions. Jitter ... Research Article
Research Article  |   June 01, 1985
Quantitative Spectral Evaluation of Shimmer and Jitter
 
Author Affiliations & Notes
  • Fritz Klingholz
    Ludwig-Maximilians-University, Munich, West Germany
  • Frank Martin
    Ludwig-Maximilians-University, Munich, West Germany
Article Information
Research Articles
Research Article   |   June 01, 1985
Quantitative Spectral Evaluation of Shimmer and Jitter
Journal of Speech, Language, and Hearing Research, June 1985, Vol. 28, 169-174. doi:10.1044/jshr.2802.169
History: Received March 28, 1983 , Accepted September 17, 1984
 
Journal of Speech, Language, and Hearing Research, June 1985, Vol. 28, 169-174. doi:10.1044/jshr.2802.169
History: Received March 28, 1983; Accepted September 17, 1984

A vowel [a]-like, synthesized speech wave was perturbated by defined and comparable jitter and shimmer levels. The signal-to-noise ratio was calculated from the speech wave spectra. Noise emerges in those spectral regions in which the harmonics have high amplitudes, that is, at low frequencies and in the formant regions. Jitter created noise levels significantly higher than shimmer. To verify the theoretical findings, the voices of 32 women with functional voice disorders were analyzed for shimmer and jitter. It was found that only jitter is relevant for differentiating between hypo- and hyperfunctional voice disorders. Jitter was reduced in hyperfunctional voice disorder. This is presumed to be an effect of the high vocal fold tension found in the disorder.

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