Transducer impedance measurement for hearing aid
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United States of America Patent
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Dec 13, 2016
Grant Date -
Sep 10, 2015
app pub date -
May 19, 2015
filing date -
Apr 11, 2012
priority date (Note) -
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Abstract
A hearing aid is disclosed, which, in a test mode, can determine the impedance of the transducer that stimulates the anatomy of the patient. Impedance may be determined by simultaneous determination of the current flowing through the transducer and the voltage across the transducer. In some cases, the output amplifier of the hearing aid includes two outputs, with one being a scaled and/or summed replica of the other. The amplifier is driven with a periodic signal with a particular frequency and a known peak voltage. The periodic signal may be sinusoidal. The primary output of the amplifier is electrically connected to the transducer, with a known current given by the peak input current and a known gain of the amplifier. The voltage from the secondary output of the amplifier is measured. The impedance is calculated by dividing the measured voltage from the secondary output of the amplifier by the known current.
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