IMI/Publicaţii/CSJM/Ediţii/CSJM v.10, n.2 (29), 2002/

Hints About Some Baseful but Indispensable Elements in Speech Recognition and Reconstruction

Authors: Mihaela Costin, Marius Zbancioc
Keywords: Cochlear implant (CI), Fast Fourier Transform (FFT), Wavelet Transform (WT), Cepstrum.


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 F0 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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