Abstract
A system for characterizing individual voice quality has been developed and used successfully to describe normal voice, pathological voice, and paralinguistic affect. In this study, voice quality analysis is used to evaluate the distortion introduced by LPC‐based speech coding. Vocal profiles of speakers are obtained by having trained judges rate the extent to which 21 phonetically based features deviate from the “neutral” setting. Profiles for original and coded material from the same speaker are compared and a distortion measure is derived that quantifies the change in voice quality attributable to the coder. Results indicate that voice quality analysis is sensitive to many characteristics of LPC types of source coding, quantization of spectral parameters, and pole frequency and bandwidth accuracy.
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