Variable sensitivity control for a cochlear implant
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United States of America Patent
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Apr 21, 2009
Grant Date -
Sep 2, 2004
app pub date -
Apr 11, 2002
filing date -
Apr 11, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The invention provides an amplifier for providing adaptive operation of an auditory prosthesis. The amplifier receives an input signal and produces an output signal, and comprises a gain control. Estimates of the current noise floor value of the input signal are obtained, and in response to a change in the current estimated noise floor value, the gain control alters the amount of gain applied to the input signal. Further, in response to the change in the current estimated noise floor value, the gain control alters a gain compression ratio of the amplifier across the dynamic range of the amplifier. The present invention allows for adaptive operation of the amplifier responsive to varying noise floor levels, while maintaining desired gain characteristics of the amplifier across a range of input signal levels.
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