Abstract
The benefit of supplementing speechreading with frequency-selective sound-pressure information or formant-frequency information was studied by auditorily presenting this information to normal-hearing listeners without experience in speechreading. In a first experiment the sound-pressure levels in one or two, octave or 1/3-octave bands were used to amplitude-modulate pure-tone carriers with frequencies equal to the center frequencies of the filterbands (500, 1600, or 3160 Hz). Eighteen listeners scored 65.7% correct syllables (from totally unknown sentences) for speechreading with sound-pressure information in a single one-octave band at 500 Hz, and 86.7% correct syllables for speechreading with two one-octave bands at 500 and 3160 Hz, respectively. Speechreading-only scored 22.8%. In a second experiment the frequencies of the first and second formant from voiced speech were presented either as pure tones, or as a complex speechlike signal. In this experiment 18 (other) listeners scored 82.0% correct syllables on speechreading with formant-frequency information. No significant difference was found between presenting this information as pure tones or as a complex speechlike signal. Speechreading-only scored again 22.8% correct syllables.
Published Version
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