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Spectral, cepstral, and multivariate exploration of tracheoesophageal voice quality in continuous speech and sustained vowels

The quality of tracheoesophageal voice can vary substantially. Although previous research has identified acoustic differences between various types of voicing (i.e., laryngeal, tracheoesophageal, esophageal, etc.), acoustic analysis has failed to quantify the degree of alaryngeal voice quality. This study assessed the value of several cepstral, spectral, and perturbation measures in quantifying the overall quality of tracheoesophageal voice production.