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A physical method for measuring speech-transmission quality

H J Steeneken, T Houtgast

    The Journal of the Acoustical Society of America
    |January 1, 1980
    PubMed
    Summary
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    A new Speech-Transmission Index (STI) measures speech channel quality, extending the Articulation Index (AI) to include nonlinear and time-domain distortions. This physical method accurately predicts speech intelligibility, comparable to subjective tests.

    Area of Science:

    • Acoustics
    • Signal Processing
    • Speech Communication

    Background:

    • Traditional Articulation Index (AI) primarily addresses frequency-domain distortions like noise and band-limiting.
    • Existing methods often struggle to comprehensively evaluate complex channel impairments.

    Purpose of the Study:

    • To develop a physical measurement method for speech-transmission channel quality.
    • To extend the Articulation Index concept to incorporate a wider range of distortion types.

    Main Methods:

    • Utilized the Modulation Transfer Function (MTF) of transmission channels as the core concept.
    • Adapted the MTF to account for nonlinear distortions (e.g., peak clipping) and time-domain distortions (e.g., reverberation, echoes, AGC).
    • Developed the Speech-Transmission Index (STI) as the resulting measurement metric.

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    Main Results:

    • Correlated the Speech-Transmission Index (STI) with subjective intelligibility scores across 167 diverse transmission channels.
    • Demonstrated a relative predictive power of 5% in PB-word score, comparable to subjective evaluations.
    • Achieved an accuracy of approximately 1 dB when expressed in terms of signal-to-noise ratio.

    Conclusions:

    • The developed Speech-Transmission Index (STI) provides a robust physical measure of speech-transmission quality.
    • STI effectively accounts for various distortions, offering an objective alternative to subjective intelligibility testing.
    • Pilot studies indicate the STI's utility for evaluating digital-speech transmission channels.