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Characterization of tongue shape.

K A Morrish, M Stone, B C Sonies

    Ultrasonic Imaging
    |January 1, 1984
    PubMed
    Summary
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    This study presents mathematical methods for analyzing tongue shapes from ultrasound images during speech. These techniques reliably approximate tongue position, slope, and curvature for speech sound analysis.

    Area of Science:

    • Speech science
    • Biomedical engineering
    • Applied mathematics

    Background:

    • Accurate analysis of tongue articulation is crucial for understanding speech production.
    • Ultrasound imaging offers a non-invasive method for visualizing tongue movements.
    • Quantifying tongue shape dynamics requires robust mathematical approaches.

    Purpose of the Study:

    • To develop and evaluate mathematical techniques for analyzing tongue shapes from ultrasound data.
    • To approximate key geometric features of the tongue surface during speech.
    • To assess the reliability of the proposed analytical methods.

    Main Methods:

    • Approximating the mid-sagittal tongue surface using discrete points from ultrasound images.
    • Employing finite difference approximations to calculate derivatives (position, slope, curvature).

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  • Utilizing curve fitting as an alternative method for surface approximation and analysis.

    • Main Results:

    • The study successfully applied mathematical techniques to quantify tongue shape parameters.
    • Both finite difference and curve fitting methods provided reliable approximations of tongue geometry.
    • The methods were demonstrated on a simple speech sound, showing potential for complex analyses.

    Conclusions:

    • Mathematical analysis of ultrasound tongue images provides a reliable method for studying speech articulation.
    • The developed techniques can quantify tongue position, slope, and curvature during speech.
    • These methods offer a valuable tool for research in speech science and related fields.