Authors: Mihaela Costin, Marius Zbancioc
Keywords: Cochlear implant (CI), Fast Fourier Transform (FFT), Wavelet Transform (WT), Cepstrum.
Abstract
The cochlear implant (CI) is a device used to reconstruct the hearing capabilities of a person diagnosed with total cophosis. This impairment may occur after some accidents, chemotherapy etc., the person still having an intact hearing nerve. The cochlear implant has two parts: a programmable, external part, the Digital Signal Processing (DSP) device which process and transform the speech signal, and another surgically implanted part, with a certain number of electrodes (depending on brand) used to stimulate the hearing nerve.
The speech signal is fully processed in the DSP external device resulting the ``coded'' information on speech. This is modulated with the support of the fundamental frequency F
0 and the energy impulses are inductively sent to the hearing nerve. The correct detection of this frequency is very important, determining the manner of hearing and making the difference between a "computer'' voice and a natural one. The results are applicable not only in the medical domain, but also in the Romanian speech synthesis.
Mihaela Costin, Marius Zbancioc
Institutul de Informatica Teoretica,
Academia Romana - Filiala Iasi,
B-dul Carol I nr. 8, 6600 Iasi, Romania
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