Abstract
The lip-reading aid tested consisted of a vibratory channel and an electrotactile channel. The speech wave was low-pass filtered at 1000 Hz and presented to the palm via a Suvag vibrator and was high-pass filtered at 4000 Hz and delivered to the back of the hand by a bipolar pulse generator designed by Frank Saunders and built by R. M. Sachs. The electrotactile channel provides information about sibilants, bursts, and higher formants; and the vibratory channel provides rhythm, stress patterns, and other prosodic features. Subjects were two normally hearing adults listening to noise that masked the acoustic signal. Test materials consisted of nonsense syllables, words, sentences, and ongoing text, each set being used under three conditions: (1) lip reading alone, (2) lip reading plus vibrator, and (3) lip-reading, vibrator, and electrotactile stimulation. All tests showed that the vibrator with lip reading was superior to lip reading alone and that adding the electrotactile channel provided further benefit. The range of improvement in the vibrator-plus-lip-reading condition was 7–21%. Electrotactile stimulation provided an additional 2–10% improvement.
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