Differential microphone
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United States of America Patent
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Sep 7, 2004
Grant Date -
N/A
app pub date -
Aug 1, 2001
filing date -
Aug 1, 2001
priority date (Note) -
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Abstract
A new acoustic sensing device or directional microphone having greater sensitivity and reduced noise. The directional microphone or acoustic sensor has a rigid, one micron thick, polysilicon membrane having dimensions of about 1 mm.times.2 mm. The membrane is supported upon its center by rigid supports having torsional and transverse stiffness. The differential microphone is useful in hearing aids, telecommunications equipment, information technology and military applications.
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