Comparison of Acoustic Voice Perturbation Measures Among Three Independent Voice Laboratories The purpose of this study was to compare jitter and shimmer data measured with three different analysis systems, the Visi-Pitch PC system (Pine Brook) and two systems based on minicomputers (Chicago and Denver), as a preliminary step toward establishing recording and analysis standards. The results show that, although similar hardware ... Research Note
Research Note  |   August 01, 1991
Comparison of Acoustic Voice Perturbation Measures Among Three Independent Voice Laboratories
 
Author Affiliations & Notes
  • Michael P. Karnell
    University of Chicago
  • Ronald S. Scherer
    Denver Center for the Performing Arts
  • Laurie B. Fischer
    Kay Elemetrics Corporation Pine Brook
  • Requests for reprints should be sent to Michael P. Karnell, University of Chicago Medical Center, Otolaryngology—Head and Neck Surgery, 5841 South Maryland Avenue, Box 412, Chicago, IL 60637.
Article Information
Speech / Research Notes
Research Note   |   August 01, 1991
Comparison of Acoustic Voice Perturbation Measures Among Three Independent Voice Laboratories
Journal of Speech, Language, and Hearing Research, August 1991, Vol. 34, 781-790. doi:10.1044/jshr.3404.781
History: Received April 9, 1990 , Accepted September 28, 1990
 
Journal of Speech, Language, and Hearing Research, August 1991, Vol. 34, 781-790. doi:10.1044/jshr.3404.781
History: Received April 9, 1990; Accepted September 28, 1990

The purpose of this study was to compare jitter and shimmer data measured with three different analysis systems, the Visi-Pitch PC system (Pine Brook) and two systems based on minicomputers (Chicago and Denver), as a preliminary step toward establishing recording and analysis standards. The results show that, although similar hardware and software used at independent laboratories can yield similar findings, differences in recording hardware as well as recording and analysis procedures can result in important differences in perturbation findings. Jitter measurements obtained with the Visi-Pitch were not consistently in good agreement with jitter measurements obtained from the minicomputer systems due, in part, to an interaction between the Visi-Pitch internal filter selected during the recording process and the novel method of pitch period determination used in the Visi-Pitch. Magnitude of shimmer measurements differed between the two minicomputer systems, in part because of differences in amplitude resolution of the A/D converters and recording noise. The correlation between the two shimmer data sets was relatively high, however, indicating that relative changes across utterances were comparable in spite of magnitude differences.

Acknowledgments
The authors would like to thank Eve Podet, Ligang Li, and Vern Vale for their help in data analysis and Neal Pinto for discussion. Special thanks are extended to Dianne Bless for important discussions during the early stages of the project and to E. Thomas Doherty for a meticulous and extremely helpful review. The authors gratefully acknowledge support from grant number R01 DC00387 from the National Institutes of Health to the Denver Center for the Performing Arts; from Otolaryngology-Head and Neck Surgery, Pritzker School of Medicine, University of Chicago; and from Kay Elemetrics Corporation.
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