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Speechreading supplemented with frequency-selective sound-pressure information.

M Breeuwer, R Plomp

    The Journal of the Acoustical Society of America
    |September 1, 1984
    PubMed
    Summary

    Supplementing speechreading with specific sound frequencies significantly improves speech perception. Adding auditory frequency information boosted syllable recognition from 22.8% to over 86% in normal-hearing listeners.

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    Area of Science:

    • Audiology
    • Speech Science
    • Signal Processing

    Background:

    • Speechreading (lip-reading) alone provides limited auditory information.
    • Auditory feedback can potentially enhance speech perception, especially in noisy environments or for individuals with hearing impairments.
    • Frequency-selective sound-pressure information may offer complementary cues to visual speech signals.

    Purpose of the Study:

    • To investigate the efficacy of augmenting speechreading with frequency-selective auditory sound-pressure information.
    • To quantify the improvement in speech perception when auditory cues are combined with visual speech information.
    • To determine the optimal frequency bands for delivering supplementary auditory information.

    Main Methods:

    • Normal-hearing listeners were tested on syllable recognition using speechreading alone and combined with auditory frequency information.

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  • Auditory information was derived from specific frequency bands (500, 1600, 3160 Hz) of the speech signal.
  • Amplitude-modulated pure-tone carriers were used to present sound-pressure levels from one or two 1-octave bandwidth filters.

    • Main Results:

    • Speech perception improved significantly with the addition of auditory sound-pressure information.
    • Syllable recognition increased from 22.8% (speechreading only) to 65.7% with one frequency band (500 Hz).
    • Recognition reached 86.7% when two frequency bands (500 and 3160 Hz) were used, demonstrating a substantial benefit.

    Conclusions:

    • Frequency-selective sound-pressure information effectively enhances speechreading performance in normal-hearing individuals.
    • Combining auditory cues across different frequency bands yields the most significant improvements in speech perception.
    • This approach holds potential for developing assistive listening devices to aid individuals with hearing loss.