Microphone with non-symmetrical directivity pattern
First Claim
1. A microphone comprising:
- a diaphragm for sensing sound pressure waves, said diaphragm having a front side and a rear side;
means for sensing forward and rearward movement of said diaphragm, said movement sensing means including an electrically conductive element mounted in spaced relationship to the rear side of said diaphragm so as to define therebetween a cavity;
a damping plug member for positioning said movement sensing means in said spaced relationship, said damping plug member substantially enclosing said cavity; and
a diaphragm mounting member attached to said diaphragm,said damping plug member being in pressing contact with diaphragm mounting member, said damping plug member further having a non-symmetrical arrangement of at least one aperture for permitting sound pressure waves to enter said substantially enclosed cavity at substantially a peripheral edge of said cavity, said at least one aperture extending between said diaphragm mounting member and said damping plug member.
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Accused Products
Abstract
A microphone having unique polar response characteristics has a virtual axis of maximum pickup sensitivity which is angularly displaced from its physical horizontal longitudinal axis. Forward and rearward movement of a diaphragm is sensed by a sensing element mounted in spaced relationship to a rear side of the diaphragm. A substantially enclosed cavity is formed between the diaphragm rear side and the sensing element, with a non-symmetrical arrangement of at least one aperture for permitting sound pressure waves to enter said cavity, so that the polar response curve of the microphone in a horizontal plane is angularly displaced about a line perpendicular to the microphone'"'"'s horizontal longitudinal axis.
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Citations
11 Claims
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1. A microphone comprising:
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a diaphragm for sensing sound pressure waves, said diaphragm having a front side and a rear side; means for sensing forward and rearward movement of said diaphragm, said movement sensing means including an electrically conductive element mounted in spaced relationship to the rear side of said diaphragm so as to define therebetween a cavity; a damping plug member for positioning said movement sensing means in said spaced relationship, said damping plug member substantially enclosing said cavity; and a diaphragm mounting member attached to said diaphragm, said damping plug member being in pressing contact with diaphragm mounting member, said damping plug member further having a non-symmetrical arrangement of at least one aperture for permitting sound pressure waves to enter said substantially enclosed cavity at substantially a peripheral edge of said cavity, said at least one aperture extending between said diaphragm mounting member and said damping plug member. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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- 9. In an electret capacitor microphone having means for creating an interior cavity for providing said microphone with a directional response pattern, the improvement comprising a non-symmetrical arrangement of at least one aperture in said means, said aperture communicating at one end with a radially peripheral edge of said interior cavity and at the other end with outside the microphone.
Specification