![]() The reader will understand the utility of applying select perturbation parameters and the nonlinear measure of correlation dimension for the characterization of the tremulous voice. This voicing pattern is the result of tremor affecting structures within the speech mechanism, resulting in modulation of lung pressure, phonation, articulation, and resonance during speaking. We conclude that these parameters may have utility for the clinical quantification of tremor severity and treatment effects. Vocal tremor is a neurogenic voice disorder characterized by a nearly periodic modulation in pitch and loudness during sustained phonation. Percent jitter, percent shimmer, FTRI, Fftr, and correlation dimension values were found to be significantly higher in the tremor group than in the control group. No significant difference was found between the tremor and control groups for ATRI and Fatr. You may also have times when your voice sounds normal. You may have times when you cannot make any sounds at all. Your voice may sound jerky, shaky, hoarse, or tight. With spasmodic dysphonia, or SD, your vocal folds do not move like they should. Signals were analyzed via correlation dimension and several parameters from the Multi-Dimensional Voice Program (MDVP): percent jitter, percent shimmer, amplitude tremor intensity index (ATRI), frequency tremor intensity index (FTRI), amplitude tremor frequency (Fatr), and fundamental frequency tremor frequency (Fftr). Spasmodic dysphonia is a long-term, or chronic, voice disorder. These were compared to signals from 24 subjects with normal voices. Signals were obtained from 25 subjects with diagnoses of either Parkinson's disease or vocal polyps exhibiting vocal tremor. Acoustic analysis may provide a useful means to quantitatively characterize the tremulous voice.
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