Output regulator for feedback reduction in hearing aids
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United States of America Patent
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Jan 9, 2001
Grant Date -
N/A
app pub date -
Oct 6, 1998
filing date -
Oct 6, 1998
priority date (Note) -
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Abstract
In a hearing aid having feedback cancellation, a voltage regulator is provided to regulate the voltage from the hearing aid battery to the class D output. Feedback cancellation processing dynamically models the entire acoustic feedback path from the hearing aid processing to microphone, including the gain of the output stage. The gain of the output stage varies with the voltage of the battery, and the battery voltage depresses when a loud signal is processed by hearing aid, so the voltage regulator prevents the output stage gain from varying with time.
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