Objective voice analysis in dysphonic patients: new data including nonlinear measurements

Folia Phoniatr Logop. 2007;59(1):20-30. doi: 10.1159/000096547.

Abstract

Objectives/hypothesis: This report describes a comparative study of objective voice evaluation using a multiparametric protocol including aerodynamic parameters and linear and nonlinear acoustic parameters recorded on an EVA(R) workstation and perceptual voice analysis by a jury.

Study design: A total of 449 samples were retrospectively selected including 391 patients with pathological voices (308 women and 141 men) and 58 controls with normal voices (38 women and 20 men). A prospective complementary study concerning 43 female patients and 3 controls is presented.

Methods: Objective measures included fundamental frequency (Fo), intensity, jitter, signal-to-noise ratio (SNR), Lyapunov coefficient (Lya), oral airflow (OAF), estimated subglottic pressure (ESGP), maximum phonatory time (MPT) and vocal range. A jury of 4 experienced listeners was instructed to classify voice samples (continuous speech) according to the G (overall dysphonia) component of the GRBAS score on a Visual Analogue Scale (VAS) secondarily transformed in a scale ranging from 0 for normal to 3 for severe dysphonia.

Results: It was shown that a nonlinear combination of only 7 parameters in women (vocal range, Lya, ESGP, MPT, OAF, SNR, and Fo) and 6 parameters in men (vocal range, Lya, OAF, ESGP, Fo, SNR) allowed classification of 81% voice samples in the same grade as the jury in women and 84% in men. In the prospective study, 80.5% were correctly classified with the same set of objective measurements.

Discussion: The relative importance of the different objective parameters in this type of discriminant analysis is dealt with. Special emphasis is placed on Lya.

Publication types

  • Comparative Study

MeSH terms

  • Adult
  • Aged
  • Female
  • Humans
  • Male
  • Middle Aged
  • Nonlinear Dynamics*
  • Phonetics
  • Retrospective Studies
  • Speech Production Measurement
  • Voice Disorders / diagnosis*
  • Voice Disorders / epidemiology*
  • Voice Quality*