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Spectral sharpness and vowel dissimilarity.

T M van Veen, T Houtgast

    The Journal of the Acoustical Society of America
    |February 1, 1985
    PubMed
    Summary
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    Spectral envelope modifications significantly impact vowel sound perception. Sharpening or smoothing spectral envelopes reveals that modulations around 2 ripples/octave are key to perceived differences in vowel sounds.

    Area of Science:

    • Acoustics
    • Psychoacoustics
    • Speech Perception

    Background:

    • Spectral envelopes of sounds can be analyzed as sums of sinusoidal spectral modulations.
    • Spectral sharpening and smoothing involve altering specific parts of this ripple spectrum.

    Purpose of the Study:

    • To investigate how modifying spectral envelopes affects perceived dissimilarities among synthetic vowel sounds.
    • To identify which spectral modulation densities are most influential in vowel perception.

    Main Methods:

    • Triadic comparison method used to assess perceived sound differences.
    • Synthetic vowel-like sounds with manipulated spectral envelopes were created.
    • Analysis focused on the relationship between ripple spectrum modifications and perceived dissimilarities.

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    Main Results:

    • For a single vowel, perceived dissimilarities were dominated by spectral modulations around 2 ripples/octave.
    • For multiple vowels, perceived dissimilarities were mainly determined by the global spectral envelope shape (up to 1.5-2 ripples/octave).
    • Fine spectral details, including those affected by lateral suppression, had minor influence on overall vowel dissimilarity.

    Conclusions:

    • Perceived vowel dissimilarities depend on specific spectral modulation ranges.
    • The global spectral shape is more critical than fine details for distinguishing between different vowels.
    • The role of lateral suppression in vowel perception appears limited to specific spectral regions.