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Time-shift, trial, and gender effects on vocal perturbation measures
M Jafari1, J A Till, L F Truesdell
1Department of Audiology and Speech Pathology, VA Medical Center, Long Beach, California 90822.
Journal of Voice : Official Journal of the Voice Foundation
|December 1, 1993
Summary
Jitter and shimmer measures in voice analysis show stability with larger sample sizes. Trial and gender effects were minimal, except for specific measures like APQ and absolute jitter.
Area of Science:
- Speech Science
- Acoustic Analysis
- Voice Perturbation
Background:
- Jitter and shimmer are key acoustic measures of voice perturbation.
- Understanding their stability and influencing factors is crucial for accurate voice assessment.
Purpose of the Study:
- To assess the stability of jitter and shimmer measures against variations in sample site.
- To investigate the effects of trial and gender on these voice perturbation parameters.
Main Methods:
- Examined three jitter and three shimmer measures.
- Analyzed data from windows starting at five different adjacent cycles.
- Calculated coefficients of variation to assess variability.
Main Results:
- Voice perturbation measures showed sample size dependence, with variability decreasing asymptotically as window size increased.
- No significant trial effect was found, except for APQ (Amplitude Perturbation Quotient).
- No significant gender effect was observed, except for absolute jitter.
Conclusions:
- Larger sample sizes enhance the stability of jitter and shimmer measures against shifts in sample site.
- Potential influence of long smoothing windows on shimmer measures (like APQ) for certain speakers warrants further investigation.