Application of acoustic methods linear and nonlinear in chordal unilateral paralysis
Aplicación de métodos acústicos lineales y no lineales en parálisis cordales unilaterales
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A new methodology that combines traditional acoustic analysis and perceptual algorithms for nonlinear dynamics is presented. Specifically, Lyapunov coefficients applied to measure high disturbance’s voices. Vowel / a / isolated and sustained from 15 normal Buenos Aires Spanish speakers and 7 with unilateral paralysis of different sex and age were evaluated. The emissions were digitally recorded in an acoustic chamber with a dynamic vocal microphone and conversational speech intensity. For the measurement of the coefficients, Wolf algorithm (1985) modified by Giovanni (1999) was used. The traditional measures of perturbation jitter (Horii, 1975 and Milenkovic 1987) and perceptual scale GRBAS (Hirano, 1981) applied to evaluate the degree of severity of dysphonia. The values of Lyapunov coefficients and jitter in normal voices and paralysis were presented for comparison. The voices with highest alterations showed average Lyapunov exponents of 0.83 versus 0.46 in normal voices. The results and graphs obtained show the chaotic behavior of voice and demonstrate the clinical utility of measurement. The exponents differentiate control groups from group with paralysis.
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