Interaction of Speech Coders and Atypical Speech II Effects on Speech Quality Research Article
Research Article  |   August 01, 2002
Interaction of Speech Coders and Atypical Speech II
 
Author Affiliations & Notes
  • Donald G. Jamieson
    National Centre for Audiology The University of Western Ontario London, Ontario
  • Vijay Parsa, PhD
    National Centre for Audiology The University of Western Ontario London, Ontario
  • Moneca C. Price
    National Centre for Audiology The University of Western Ontario London, Ontario
  • James Till
    California State University Long Beach
  • Contact author: Vijay Parsa, PhD, National Centre for Audiology, The University of Western Ontario, London, Ontario, Canada N6G 1H1. E-mail: parsa@nca.uwo.ca
  • * Currently affiliated with The Canadian Hearing Society, Ottawa Regional Office, Ottawa, Ontario
    Currently affiliated with The Canadian Hearing Society, Ottawa Regional Office, Ottawa, Ontario×
Article Information
Speech, Voice & Prosodic Disorders / Voice Disorders / Speech, Voice & Prosody / Speech / Research Articles
Research Article   |   August 01, 2002
Interaction of Speech Coders and Atypical Speech II
Journal of Speech, Language, and Hearing Research, August 2002, Vol. 45, 689-699. doi:10.1044/1092-4388(2002/055)
History: Received January 3, 2002 , Accepted April 4, 2002
 
Journal of Speech, Language, and Hearing Research, August 2002, Vol. 45, 689-699. doi:10.1044/1092-4388(2002/055)
History: Received January 3, 2002; Accepted April 4, 2002
Web of Science® Times Cited: 4

We investigated how standard speech coders, currently used in modern communication systems, affect the quality of the speech of persons who have common speech and voice disorders. Three standardized speech coders (GSM 6.10 RPELTP, FS1016 CELP, and FS1015 LPC) and two speech coders based on subband processing were evaluated for their performance. Coder effects were assessed by measuring the quality of speech samples both before and after processing by the speech coders. Speech quality was rated by 10 listeners with normal hearing on 28 different scales representing pitch and loudness changes, speech rate, laryngeal and resonatory dysfunction, and coder-induced distortions. Results showed that (a) nine scale items were consistently and reliably rated by the listeners; (b) all coders degraded speech quality on these nine scales, with the GSM and CELP coders providing the better quality speech; and (c) interactions between coders and individual voices did occur on several voice quality scales.

Acknowledgments
This work was supported by grants from the Natural Sciences and Engineering Research Council, the Canadian Foundation for Innovation, and the Ontario Ministry of Health. We thank Sam Kheirallah for his help during the initial phases of this project.
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