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Related Experiment Videos

A method to determine the speech transmission index from speech waveforms.

K L Payton1, L D Braida

  • 1Electrical and Computer Engineering Department, University of Massachusetts, Dartmouth 02747, USA.

The Journal of the Acoustical Society of America
|January 1, 2000
PubMed
Summary

This study introduces a new method for calculating the speech transmission index (STI) using actual speech. This approach accurately predicts speech intelligibility, even in challenging acoustic environments.

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Area of Science:

  • Acoustics
  • Speech Processing
  • Signal Analysis

Background:

  • The Speech Transmission Index (STI) is a standard metric for assessing speech intelligibility.
  • Traditional STI calculations often rely on theoretical models or artificial signals.
  • Artifacts can arise when using speech waveforms as probe stimuli in STI computations.

Purpose of the Study:

  • To present and evaluate a novel method for computing the speech transmission index (STI) using real speech stimuli.
  • To reduce artifacts associated with using speech waveforms as probe signals.
  • To compare speech-based STI values with subjective speech intelligibility scores.

Main Methods:

  • A new method for computing the speech transmission index (STI) was developed and tested.

Related Experiment Videos

  • Real speech stimuli, including conversational and clearly articulated speech, were used.
  • STI was calculated in various noisy, reverberant, and noisy-reverberant environments.
  • Speech-based STI values were compared against human speech intelligibility scores.

    • Main Results:

    • The proposed method effectively reduces artifacts when using speech waveforms.
    • Speech-based STI values showed a monotonic relationship with intelligibility scores for both speaking styles.
    • The speech-based STI proved to be a reliable predictor of speech intelligibility.

    Conclusions:

    • The speech transmission index (STI) can be reliably computed using speech probe waveforms.
    • This speech-based STI method provides an accurate alternative to theoretical calculations.
    • The developed method offers a practical approach for assessing speech intelligibility in diverse conditions.