Mean frequency of vocal vibrato relative to target frequency

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      Six professional singers of early and contemporary music produced sustained vowel phonations at three pitch levels beginning with straight tone leading to either vibrato or to vibrato followed by exaggerated vibrato. Mean fundamental frequency (F0) during the two vibrato conditions was compared with the target F0, which was measured during straight tone production. During usual vibrato production the preponderance of singers lowered their mean F0, and a lesser number maintained the straight tone mean. Only one subject elevated mean vibrato F0. During exaggerated vibrato phonation, there were four instances of elevated F0, but the same number of lowered F0 as for usual vibrato.

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