Abstract
We have treated over 20 deaf patients with a Nucleus 22-channel cochlear implant for 5 years. Generally, the patient showed satisfactory results in vowel recognition after the surgery, while the consonant recognition rate was poor. Among consonants, voiceless plosives such as p, t and k were mostly misunderstood. The discharge pattern of the electrode revealed that the poor intelligibility would be due to the low discharge rate of the electrode in the cochlea at the plosive consonant portion. In order to develop a new speech processing strategy with higher fidelity to temporal and frequential properties of consonants, we examined a method to increase the discharge rate of the electrodes to 1250 Hz and to extract on accurate formant in voice by FFT. Recently in Melbourne, a new device of cochlear implant, using a similar strategy was developed to afford better perceptual ability to deaf patients. On the other hand, indication of this surgery is expected to be expanded for not only postlingual deaf patients but for prelingual deaf children in our country, although rehabilitation of such case takes much time.
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