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Related Experiment Videos

Speechreading supplemented with formant-frequency information from voiced speech.

M Breeuwer, R Plomp

    The Journal of the Acoustical Society of America
    |January 1, 1985
    PubMed
    Summary

    Supplementing speechreading with formant frequency information significantly improved syllable identification. However, sound-pressure level information proved more effective than formant frequencies for enhancing speechreading.

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    Area of Science:

    • Audiology
    • Speech Science
    • Acoustics

    Background:

    • Speechreading, or lipreading, relies on visual cues to understand speech.
    • Auditory information, particularly formant frequencies, can potentially enhance speechreading.
    • Previous research explored various auditory supplements for speechreading.

    Purpose of the Study:

    • To investigate the effectiveness of supplementing speechreading with first and second formant frequency information.
    • To compare the efficacy of different methods of presenting formant frequency information.
    • To compare formant frequency information with sound-pressure level information as speechreading supplements.

    Main Methods:

    • 18 normal-hearing listeners participated in the study.
    • Sentences were presented under three conditions: speechreading with formant information, speechreading only, and formant information only.

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  • Formant frequencies were presented as pure tones or a complex speechlike signal.

    • Main Results:

    • Syllable identification improved from 22.8% (speechreading only) to 82.0% (speechreading with complex formant signal).
    • Formant information alone yielded 33.2% correct identification.
    • Sound-pressure level information was found to be a more effective supplement than formant frequency information.

    Conclusions:

    • Supplementing speechreading with formant frequency information, especially a complex speechlike signal, significantly enhances speech perception.
    • The effectiveness of formant frequency information is limited compared to sound-pressure level information for speechreading enhancement.