Electrical audio signal processing systems and devices – Directive circuits for microphones
Patent
1995-06-30
1997-12-30
Kuntz, Curtis
Electrical audio signal processing systems and devices
Directive circuits for microphones
381155, 381168, 381169, H04R 300
Patent
active
057039577
ABSTRACT:
A unitary housing made from an acoustically-opaque, resilient material is employed with a microphone element to form a directional microphone assembly. The microphone element includes a diaphragm which moves under the influence of sound pressure applied to its opposite surfaces to generate an electrical signal which is proportional to the differential sound pressure. The unitary housing includes a first acoustically-transparent channel for communicating sound pressure from a first port in the unitary housing to one surface of the diaphragm, and a second acoustically transparent channel for communicating sound pressure from a second port in the unitary housing to the other surface of the diaphragm. In an illustrative embodiment, the unitary housing comprises a unitary small "boot" having a surface including the ports for coupling acoustic energy to the acoustic channels, an inner chamber for housing the microphone element and a predetermined opening in a surface of the boot for accessing the inner chamber. The microphone element is inserted into the inner chamber via the predetermined opening, which is dimensioned to seal itself around the inserted microphone element so that acoustic energy cannot leak out of or into the inner chamber through the opening.
REFERENCES:
patent: 4767220 (1988-08-01), Kamp
patent: 5226076 (1993-07-01), Baumhauer, Jr. et al.
patent: 5400408 (1995-03-01), Lundgren et al.
Kuntz Curtis
Lucent Technologies - Inc.
Nguyen Duc
Stafford Thomas
Williamson Samuel R.
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