Original language | English |
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Title of host publication | The SAGE Encyclopedia of Human Communication Sciences and Disorders |
Editors | Jack Damico, Martin J. Ball |
Place of Publication | Los Angeles |
Publisher | SAGE Publications Inc. |
Pages | 959-960 |
Number of pages | 2 |
ISBN (Print) | 9781483380834 |
DOIs | |
Publication status | Published - 29 Apr 2019 |
Abstract
Jitter and shimmer are acoustic measures of frequency and amplitude perturbation, respectively, and derive from involuntary short-term vocal instability. Jitter describes cycle-to-cycle variability in fundamental frequency (F0) that cannot be explained on the basis of voluntary changes in F0, while shimmer is a measure of involuntary changes in peak amplitude across adjacent phonatory cycles.