A signal processor for a multiple-electrode hearing prosthesis
AuthorSeligman, P. M.; Patrick, J. F.; Tong, Y. C; Clark, Graeme M.; Dowell, R. C.; Crosby, P. A.
Source TitleActa Otolaryngologica
Document TypeJournal Article
CitationsSeligman, P. M., Patrick, J. F., Tong, Y. C., Clark, G. M., Dowell, R. C., & Crosby, P. A. (1984). A signal processor for a multiple-electrode hearing prosthesis. Acta Otolaryngologica, (suppl. 411), 135-139.
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Publisher’s permission requested and denied.
A 22-electrode implantable hearing prosthesis uses a wearable speech processor which estimates three speech signal parameters. These are voice pitch, second formant frequency and flattened spectrum amplitude. The signal is monitored continuously for periodicity in the range 80-400 Hz and, if this is present, stimulation occurs at the same rate. Otherwise, as in the case of unvoiced sounds, it occurs at the random rate of fluctuation of the signal envelope. The second formant is obtained by filtering to extract the dominant peak in the midband region and by continuous measurement of the zero crossing rate. The amplitude measured is that of the whole speech spectrum pre-emphasized by differentiation. The values that are presented to the patient are the parameter estimates immediately prior to the stimulation pulse. Second formant frequency is coded by selection of an appropriate electrode in the cochlea and amplitude by a suitably controlled current. Automatic gain control is used to keep the dynamic range of the amplitude estimate within the 30 dB range of the circuitry.
Keywordshearing prosthesis; acoustic signal; electromagnetic induction
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