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1. (WO1991003913) MULTI-PEAK SPEECH PROCESSOR

Pub. No.:    WO/1991/003913    International Application No.:    PCT/AU1990/000407
Publication Date: Mar 21, 1991 International Filing Date: Sep 7, 1990
IPC: A61N 1/36
H04R 25/00
Applicants: COCHLEAR PTY. LIMITED
THE UNIVERSITY OF MELBOURNE
Inventors: SELIGMAN, Peter, Misha
DOWELL, Richard, C.
Title: MULTI-PEAK SPEECH PROCESSOR
Abstract:
An improved pulsatile system for a cochlear prosthesis is disclosed. The system employs a multi-spectral peak coding strategy to extract a number, for example five, of spectral peaks from an incoming acoustic signal received by a microphone. It encodes this information into sequential pulses that are sent to selected electrodes of a cochlear implant. The first formant (F1) spectral peak (280-1000 Hz) and the second formant (F2) spectral peak (800-4000 Hz) are encoded and presented to apical and basal electrodes, respectively, F1 and F2 electrode selection follows the tonotopic organization of the cochlea. High-frequency spectral information is sent to more basal electrodes and low-frequency spectral information is sent to more apical electrodes. Spectral energy in the regions of 2000-2800 Hz, 2800-4000 Hz, and above 4000 Hz is encoded and presented to three fixed electrodes. The fundamental or voicing frequency (F0) determines the pulse rate of the stimulation during voiced periods and a pseudo-random aperiodic rate determines the pulse rate of stimulation during unvoiced periods. The amplitude of the acoustic signal in the five bands determines the stimulus intensity.