G - Physics – 10 – L
Patent
G - Physics
10
L
326/1, 354/22, 3
G10L 11/00 (2006.01) A61F 11/04 (2006.01) A61N 1/36 (2006.01) G10L 11/06 (2006.01) H04R 25/00 (2006.01)
Patent
CA 1165884
ABSTRACT OF THE DISCLOSURE In a speech processor for controlling a hearing prosthesis, an implanted electrode array stimulates the auditory nerve fibres of a patient by the application of electrical currents to selected electrodes in the array. The processing system com- prises means for generating an input signal corresponding to a received speech signal, means for estimating the amplitude and frequency of the fundamental voicing and second formant com- ponents of the speech signal, and means for determining whether the speech signal is voiced or unvoiced. Programmable means produce instruction data which in use causes the application of the electrical currents to selected electrodes in the array. The programmable means is programmed with data defining a pre- determined relationship between each electrode and a selected range of second formant frequencies based on psychophysical testing of the patient and causing selection of the electrodes based on the estimated-frequency of said second formant compo- nent such as to produce the desired percepts in the auditory- like sensations generated in the patient. The selected electrode is stimulated at a frequency dependent on the estimated frequency of said fundamental voicing component for voiced speech signals and at a lower substantially constant frequency for unvoiced speech signals. The programmable means also produces data which determines the level of stimulation of each selected electrode dependent on the estimated amplitude of the second formant component of the speech signal as well as on predetermined data relating to the sensitivity of each electrode implanted in the patient. By providing an output signal in which both formant and prosodic information is present, the production of confusing precepts is avoided.
355459
Clark Graeme M.
Millar John B.
Patrick James F.
Seligman Peter M.
Tong Yit C.
Borden Ladner Gervais Llp
University Of Melbourne (the)
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