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Related Experiment Videos

Harmonic levels and vowel roughness.

F W Emanuel, R L Whitehead

    Journal of Speech and Hearing Research
    |December 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Vocal roughness negatively impacts lower harmonics in vowels, but higher harmonics show varied responses. Spectral noise may better indicate vocal roughness than harmonic levels.

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    Area of Science:

    • Speech acoustics
    • Phonetics
    • Voice science

    Background:

    • Vocal roughness affects voice quality and perception.
    • Understanding spectral changes associated with vocal roughness is crucial for voice analysis.

    Purpose of the Study:

    • To investigate the relationship between simulated vocal roughness and spectral harmonic levels in vowels.
    • To determine if spectral noise is a more reliable indicator of vocal roughness than harmonic amplitudes.

    Main Methods:

    • Twenty adult males produced sustained vowels normally and with simulated roughness.
    • Vocal recordings were rated for roughness by 11 judges.
    • Acoustic spectra (3-Hz bandwidth) were analyzed for harmonic levels and fundamental frequency (f0).

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    Main Results:

    • Lower harmonic levels (first three) decreased with increased vocal roughness.
    • Higher harmonics of /u/ and /i/ vowels exhibited reversals in this trend.
    • A significant negative correlation was found between lower harmonic levels and roughness ratings.

    Conclusions:

    • Increased vocal roughness diminishes lower spectral harmonics in vowels.
    • Spectral noise level measurements may offer a more dependable acoustic index of vocal roughness and aperiodicity than harmonic levels.