Apparatus and method for providing proper microphone DC bias current and load resistance for a telephone
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United States of America Patent
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Nov 17, 1998
Grant Date -
N/A
app pub date -
Aug 7, 1996
filing date -
Aug 7, 1996
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An apparatus and method for providing proper bias current and load resistance for a telephone microphone regardless of the type of microphone used. Microphone bias voltage, if any exists at the microphone, is compared to a reference voltage selected to define a distinction between various types of microphones. If the bias voltage exceeds the reference voltage, an impedance matching the correlated type of microphone is interdicted on both sides of the microphone. If reference voltage exceeds bias voltage, a different impedance path is presented to match it with the type of correlated microphone. Therefore, the invention automatically provides proper bias current and load resistance for the microphone.
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