Periodicity perturbation in natural English vowels

Authors

  • J.L. Adlington Dept. of Linguistics, Alberta Univ., Edmonton, Alta., Canada
  • A.J. Rozsypal Dept. of Linguistics, Alberta Univ., Edmonton, Alta., Canada

Keywords:

speech analysis and processing, natural English vowels, jitter, shimmer, speech signals, peak-picking, quadratic interpolation

Abstract

To establish normative values for natural production, jitter (glottal period perturbation) and shimmer (amplitude perturbation) were measured for nine Canadian English vowels, produced by eight male and eight female speakers in the sentence frame `Please say /hVd/ not /hVd/.' The speech signals were digitized at a 20 kHz sampling rate. Following extraction of the vowel, the duration and peak amplitude of each period were measured using a semi-automatic peak-picking procedure with quadratic interpolation. Jitter and shimmer were determined as distance from a two-point linear trend line centered around the current period. Period measures were normalized by dividing this distance by the local mean period duration averaged across three periods; a similar measure was employed for shimmer. For both jitter and shimmer, unexpectedly large differences among speakers were found. The relation between jitter and shimmer within the vowel was also investigated by cross-correlating the signed jitter and shimmer perturbations of individual vowel periods. Significant correlations appeared for less than one quarter of the vowel tokens

Additional Files

Published

1988-03-01

How to Cite

1.
Adlington J, Rozsypal A. Periodicity perturbation in natural English vowels. Canadian Acoustics [Internet]. 1988 Mar. 1 [cited 2025 Feb. 20];16(1):17-23. Available from: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/585

Issue

Vol. 16 No. 1 (1988)

Section

Technical Articles

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