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A frequency importance function for continuous discourse.

G A Studebaker, C V Pavlovic, R L Sherbecoe

    The Journal of the Acoustical Society of America
    |April 1, 1987
    PubMed
    Summary
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    This study found lower frequencies are more critical for understanding continuous discourse (CD) than previously thought. The intelligibility of CD relies more on lower speech frequencies compared to nonsense syllables.

    Area of Science:

    • Audiology
    • Speech Perception
    • Acoustics

    Background:

    • Understanding speech intelligibility is crucial for audiological assessments and hearing aid fitting.
    • Existing models, like ANSI S3.5-1969, use articulation indices based on nonsense syllable data.
    • The importance of different speech frequencies for continuous discourse (CD) intelligibility is less understood.

    Purpose of the Study:

    • To investigate the relationship between speech intelligibility of continuous discourse (CD) and the articulation index.
    • To determine the relative importance of lower frequencies for CD intelligibility.
    • To compare the frequency crossover points for CD with established data for nonsense syllables.

    Main Methods:

    • Normal hearing subjects listened to continuous discourse passages under 135 conditions.

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  • Conditions involved varying filtering and signal-to-noise ratios.
  • Intelligibility scores were collected and analyzed against the articulation index.

    • Main Results:

    • The relationship between CD intelligibility and the articulation index differed from the ANSI S3.5-1969 standard.
    • Lower speech frequencies were found to be more critical for CD intelligibility compared to nonsense syllables.
    • The frequency crossover point for CD was approximately 0.5 to 0.7 octaves lower than reported for nonsense syllables.

    Conclusions:

    • The articulation index derived from nonsense syllables may not fully capture the intelligibility of continuous discourse.
    • Lower frequency speech information plays a relatively greater role in understanding continuous discourse.
    • These findings suggest a need to re-evaluate frequency weighting in speech intelligibility models for continuous discourse.