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Vocal shimmer in sustained phonation

Y Horii

    Journal of Speech and Hearing Research
    |March 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

    Vocal shimmer, a measure of voice perturbation, was analyzed in adult males. Results revealed average shimmer below the critical threshold, with correlations found between shimmer, jitter, and fundamental frequency standard deviation.

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    Area of Science:

    • Speech and Hearing Sciences
    • Acoustic Phonetics
    • Voice Science

    Background:

    • Vocal shimmer quantifies voice perturbation, a key indicator of voice quality.
    • Understanding normal vocal shimmer ranges is crucial for diagnosing voice disorders.
    • Previous research has explored jitter and shimmer, but comprehensive analysis in adult males is ongoing.

    Purpose of the Study:

    • To investigate vocal shimmer during sustained vowel phonation in adult males.
    • To establish normative data for vocal shimmer in this demographic.
    • To explore the relationships between shimmer, jitter, and fundamental frequency variability.

    Main Methods:

    • Thirty-one adult male speakers participated in the study.
    • Sustained phonation of vowels /a/, /i/, and /u/ was recorded.

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  • An automatic analysis program was employed to measure vocal shimmer (dB).

    • Main Results:

    • The overall average vocal shimmer was found to be 0.39 dB.
    • This average is well below the critical value of 0.98 dB.
    • Significant correlations were observed between shimmer, jitter, and the standard deviation of fundamental frequency (fo).

    Conclusions:

    • Adult male speakers typically exhibit vocal shimmer within normal limits.
    • The findings suggest that shimmer, jitter, and fo variability are interrelated acoustic parameters.
    • This study contributes to the normative database for voice analysis in adult males.