A - Human Necessities – 61 – F
Patent
A - Human Necessities
61
F
3/110, 349/27, 3
A61F 2/18 (2006.01) A61N 1/36 (2006.01) H04R 25/00 (2006.01)
Patent
CA 2024845
-41- 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 acou- stic 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 sec- ond formant (F2) spectral peak (800-4000 Hz) are en- coded and presented to apical and basal electrodes, respectively. F1 and F2 electrode selection follows the tonotopic organization of the cochlea. High-fre- quency 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 elec- trodes. 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 un- voiced periods. The amplitude of the acoustic signal in the five bands determines the stimulus intensity.
Blamey Peter John
Dowell Richard C.
Seligman Peter M.
Cochlear Limited
R. William Wray & Associates
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