Electrical audio signal processing systems and devices – Circuitry combined with specific type microphone or loudspeaker
Patent
1996-08-07
1998-11-17
Chang, Vivian
Electrical audio signal processing systems and devices
Circuitry combined with specific type microphone or loudspeaker
379387, H04R 300
Patent
active
058388044
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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Dilley David L.
Holthaus James R.
Chang Vivian
Transcrypt International, Inc.
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