Differential microphone
AssigneeThe Research Foundation of State University of New York
InventorsRonald Miles, Sanjay Sundermurthy, Colum Gibbons, Ronald Hoy, Daniel Robert
Life of this patent
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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×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.
Claims24
A miniature microphone comprising:
- a) a thin, substantially rigid plate having a perimeter and two substantially parallel opposing faces;
- b) means for supporting rotatively attached to said substantially rigid plate at two points along said perimeter such that a line connecting said two points forms an axis of rotation which divides each of said faces into a first region and a second region;
- whereby a difference in sound pressures acting upon said first region and said second region of said two faces of said rigid plate creates a net moment and said rigid plate rotates about said axis of rotation in accordance therewith.
A miniature microphone comprising:
- a) a thin, substantially rigid plate having a perimeter and two substantially parallel opposing faces;
- b) means for supporting rotatively attached to said substantially rigid plate at least two points along said perimeter, said at least two points determining an axis of rotation of said substantially rigid plate, said axis of rotation dividing each of said faces into a first region and a second region;
- whereby a difference in sound pressures acting upon said first region and said second region of said two faces of said rigid plate creates a net moment and said rigid plate rotates about said axis of rotation in accordance therewith.
Dependencies are inferred from the claim text.