Analysis of Spectral Measures for Voiced Speech with Varying Noise and Pertubation Levels

Abstract

A number of spectral measurements involving the amplitude of the first harmonic and two general spectral tilt ratios, are systematically investigated using synthetically generated speech signals with varying amounts of jitter, shimmer and noise levels. Certain spectral tilt measures are shown to provide perturbation-free measurements of noise levels in synthesized speech signals. These spectral tilt measures are then tested on real speech signals and are shown to be relatively good noise comparators in the measurement of pre- and post-treatment levels of noise in the speech of subjects with voice disorders.