Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical energy applicator
Patent
1991-12-16
1993-12-21
Isabella, David
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical energy applicator
623 10, 623 66, A61N 100, H04R 2500, A61F 218, A61F 254
Patent
active
052713970
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.
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Blamey Peter J.
Dowell Richard C.
Seligman Peter M.
Burke Elizabeth M.
Cochlear Pty. Ltd.
Isabella David
The Univ. of Melbourne
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