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Perceptually-Motivated Modeling of Noise in Pathological Voices Brian Gabelman*, Jody Kreiman*, Bruce R. Gerratt*, Norma Antonanzas-Barroso*,
 

Summary: Perceptually-Motivated Modeling of Noise in Pathological Voices
Brian Gabelman*, Jody Kreiman*, Bruce R. Gerratt*, Norma Antonanzas-Barroso*,
and Abeer Alwan* *
*Division of Head and Neck Surge~ and **Dept. of Electrical Engineering,
UCLA, Los Ange[es, CA 90095 USA
Abstract: To determine the perceptual importance of differences in noise characteristics, a sample of pathological
voices was modeled using analysis by synthesis techniques. Spectral characteristics of noise were varied to create
different synthetic versions of each voice sample. Expert listeners compared each synthetic stimulus to the original
voice sample. The perceptual importance of differences in how vocal noise is synthesized will be discussed, as will the
relative contributions ofjitter, shimmer, and aspiration noise in modeling pathological phonation.
INTRODUCTION
Research investigating the co~elation of acoustic measures of noise and the perception of pathological
voice quality has consistent ly demonstrated a moderate association. However, this correlational approach cannot
address basic questions concerning their cause and effect relationship, such as how carefilly noise must be
modeled to preserve the perceived pathological vocal quality, and what particular aspects of the noise are
necessary to preserve natural vocal quality. To address these questions, an analysis by synthesis approach was
applied to a sample of natural pathological vowels varying in severity of pathology.
STIWLI AND RECORDING PROCEDURES
The voices of randomly-selected speakers complaining of voice disorders were recorded as part of a
phonatory function analysis. Speakers were recorded using a condenser microphone (Bruel & Kjaer) held a

  

Source: Alwan, Abeer - Electrical Engineering Department, University of California at Los Angeles

 

Collections: Computer Technologies and Information Sciences