Abstract
A new model of auditory prosthesis using a newly developed electrode is proposed. This prosthesis is less invasive than conventional ones because it can be placed superficially over the round window membrane of the cochlea rather than being inserted into the scala tympani. The electrode is coated with polyvinyl alcohol gel and is suitable as an extracochlear prosthesis because the electrode can firmly adhere to the round window membrane without damaging it. As a speech coding method, a new idea has been proposed to simultaneously transmit the pitch signal and the second formant frequency through the electrode. In this method, an additional stimulation pulse is inserted between successive pitch pulses, and the time delay between the additional pulse and the preceding pitch pulse is set in proportion to the second formant frequency. Two digital signal processors are used to extract the pitch and the second formant frequencies in real time. These time sequential stimuli are used for deaf patients. This new method of speech coding has proven effective for discrimination of the five Japanese vowels, and also for discrimination among pitch patterns.
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