Sound processor for a cochlear implant
First Claim
1. A method for generating electrical stimuli in an auditory prosthesis an implanted electrode array having a plurality of electrodes representing received sound signals, comprising:
- processing the sound signals according to a predetermined instruction set that calculates a travelling wave amplitude variation at each electrode position using broad overlapping filters, comprising;
sampling said sound signals to produce a data sample;
deriving a vector of complex Fourier transform coefficients for said data sample; and
multiplying the vector of the coefficients by a complex matrix representing an amplitude and phase of the Fourier frequency components at said each electrode position in a damaged cochlea relative to an amplitude and phase at the stapes in a normal cochlea to produce an output vector;
converting said output vector to a set of stimulus instructions for said electrode array; and
wherein said filters are not specific only to the frequencies associated with said each electrode position of said electrode array.
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Abstract
The sound processor and method uses a model of basilar membrane motion to select stimuli, based upon the predicted motion which the acoustic signal presented would produce in an acoustically excited normally hearing cochlea. The filter; used, in contrast to single channel per electrode approaches, cover multiple channels and overlap with each other. Consequently the stimuli presented produce a neural excitation pattern which approximates the spatio-temporal travelling wave observed on the basilar membrane in an acoustically excited normally hearing cochlea. Preferably, the predicted electrode stimuli are based upon the instantaneous predicted amplitude of the electrode location.
49 Citations
14 Claims
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1. A method for generating electrical stimuli in an auditory prosthesis an implanted electrode array having a plurality of electrodes representing received sound signals, comprising:
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processing the sound signals according to a predetermined instruction set that calculates a travelling wave amplitude variation at each electrode position using broad overlapping filters, comprising; sampling said sound signals to produce a data sample; deriving a vector of complex Fourier transform coefficients for said data sample; and multiplying the vector of the coefficients by a complex matrix representing an amplitude and phase of the Fourier frequency components at said each electrode position in a damaged cochlea relative to an amplitude and phase at the stapes in a normal cochlea to produce an output vector; converting said output vector to a set of stimulus instructions for said electrode array; and wherein said filters are not specific only to the frequencies associated with said each electrode position of said electrode array. - View Dependent Claims (2, 3, 4, 5)
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6. A method of processing sound signals for use in an auditory prosthesis implant, comprising:
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sampling said sound signals to produce digital data samples; calculating a traveling wave excitation pattern using digital data samples based on the amplitude and phase at each electrode position in a damaged cochlea relative to the amplitude and phase at the stapes in a normal cochlea; and converting said traveling wave excitation pattern to a set of stimulus instructions. - View Dependent Claims (7, 8, 9)
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10. A method of processing sound signals for use in generating electrical stimuli for an auditory prosthesis, said method comprising:
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processing said sound signals according to a predetermined instruction set, wherein said predetermined instruction set calculates a travelling wave amplitude variation at each electrode position using broad overlapping filters; and converting the output of said predetermined instruction set to a set of stimulus instructions for an implanted electrode array having a plurality of electrodes; wherein said filters are not specific only to the frequencies associated with said each electrode position of said electrode array, wherein said travelling wave amplitude is based on the instantaneous amplitude of said sound signal.
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11. A method of processing sound signals for use in generating electrical stimuli for an auditory prosthesis, comprising
determining a phase and amplitude of said sound signal at each electrode position in an acoustically excited normally-hearing cochlea when stimulated with said sound signal using a basilar membrane model to produce a neural excitation pattern; - and
calculating a level of neural excitation at said each electrode position in said acoustically excited normally-hearing cochlea when stimulated with said sound signal using an inner ear model; wherein said neural excitation pattern approximates the spatio-temporal pattern associated with a travelling wave observed on the basilar membrane in said acoustically excited normally-hearing cochlea when stimulated with said sound signal. - View Dependent Claims (12, 13, 14)
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Specification