Adaptive cancellation system for implantable hearing instruments
First Claim
1. A method for use with an implantable hearing instrument, comprising:
- receiving outputs from an implantable microphone and a motion sensor of the implantable hearing instrument;
generating an estimate of a latent variable;
adjusting filter coefficients of an adaptive filter of the implantable hearing instrument based on said estimate of said latent variable;
filtering said motion output to produce a filtered motion output; and
removing said filtered motion output from said microphone output to produce a cancelled output.
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Accused Products
Abstract
The invention is directed to an implanted microphone having reduced sensitivity to vibration. In this regard, the microphone differentiates between the desirable and undesirable vibration by utilizing at least one motion sensor to produce a motion signal when an implanted microphone is in motion. This motion signal is used to yield a microphone output signal that is less vibration sensitive. In a first arrangement, the motion signal may be processed with an output of the implantable microphone transducer to provide an audio signal that is less vibration-sensitive than the microphone output alone. Specifically, the motion signal may be scaled to match the motion component of the microphone output such that upon removal of the motion signal from the microphone output, the remaining signal is an acoustic signal.
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Citations
23 Claims
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1. A method for use with an implantable hearing instrument, comprising:
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receiving outputs from an implantable microphone and a motion sensor of the implantable hearing instrument; generating an estimate of a latent variable; adjusting filter coefficients of an adaptive filter of the implantable hearing instrument based on said estimate of said latent variable; filtering said motion output to produce a filtered motion output; and removing said filtered motion output from said microphone output to produce a cancelled output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for use with an implantable hearing instrument, comprising:
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activating first and second adaptive filters operative to filter an output of a motion sensor to substantially match an output of an implantable microphone, wherein said first and second filters are effectively identical and wherein respective filter coefficients of the first and second adaptive filters are dependent upon a variable associated with operating conditions of said implantable hearing instrument; receiving outputs from the implantable microphone and the motion sensor of the implantable hearing instrument; generating an estimate of said variable; filtering said motion output using said first adaptive filter to produce a first filtered motion output, wherein said first adaptive filter utilizes filter coefficients generated based on said estimate of said variable; filtering said motion output using said second adaptive filter to produce a second filtered motion output, wherein said second adaptive filter utilizes filter coefficients that are different than said estimate of said variable; removing said first and second filtered outputs from said output of said implantable microphone to generate respective first and second cancelled signals; and adjusting said estimate of said variable based on a comparison of said first and second cancelled signals. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A method, comprising:
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receiving outputs from an implanted microphone and an implanted motion sensor of a hearing prosthesis at a first time; processing the motion sensor output based on a first operating condition of the hearing prosthesis corresponding to the first time to produce a first processed motion sensor output; removing said first processed motion sensor output from the microphone output of the first time to produce a first processed signal; evoking a hearing percept based on the first processed signal; receiving outputs from the microphone and the motion sensor at a second time different from the first time; processing the motion sensor output of the second time based on a second operating condition of the hearing prosthesis corresponding to the second time to produce second processed motion sensor output, the second operating condition being effectively different from the first operating condition; removing said a second processed motion sensor output from the microphone output of the second time to produce a second processed signal; and evoking a hearing percept based on the second processed signal. - View Dependent Claims (21, 22, 23)
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Specification