Electret microphone circuit with low battery disable
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United States of America Patent
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-
Jul 24, 2001
Grant Date -
N/A
app pub date -
Nov 12, 1997
filing date -
Nov 13, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A battery circuit for coupling a battery source to an electret microphone. The circuit includes impedance circuitry for providing appropriate bias impedance for a desired microphone sensitivity, and disconnect circuitry for automatically disconnecting the battery source from the electret microphone in response to detecting a low voltage state in order to prevent distortion and low output level of the microphone. In an alternative embodiment of the invention there is provided second impedance circuitry for driving corresponding inputs with minimal loss. In another alternative embodiment of the invention there is provided a compensation circuit which operates to extend battery source life and prevent lower output at lower voltage.
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