Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
Patent
1993-02-28
1993-07-06
Dwyer, James L.
Telephonic communications
Substation or terminal circuitry
For loudspeaking terminal
379419, 379420, 379432, 381155, H04M 104
Patent
active
052260763
ABSTRACT:
A directional microphone assembly is constructed from a first-order-gradient microphone element enclosed within a housing, molded from an acoustically-opaque, resilient material such as Ethylene-Propylene-Diene-Monomer. The microphone element includes a diaphragm which moves under the influence of sound pressures applied on its opposite surfaces to generate an electrical signal which is proportional to the differential sound pressure. The housing includes a first acoustically-transparent channel for communicating sound pressure from a first opening in the housing to one surface of the diaphragm, and a second acoustically-transparent channel for communicating sound pressure from a second opening in the housing to the other surface of the diaphragm. The housing supports the microphone element and forms a continuous seal around its perimeter so that sound pressure in one channel does not leak into the other. The distance between the openings is relatively large in order to improve the sensitivity and directivity of the microphone. Moreover, the directional microphone assembly is configured to be embedded within, or behind, an exterior surface of sound-input equipment with the openings of the housing located along the exterior surface. The resilient housing structure forms a seal with the sound-input equipment surface.
REFERENCES:
patent: 3715500 (1973-02-01), Sessler et al.
patent: 3830988 (1974-08-01), Mol et al.
patent: 4009355 (1977-02-01), Poradowski
patent: 4528426 (1985-07-01), Fatovic et al.
patent: 4675906 (1987-06-01), Sessler et al.
patent: 4742548 (1988-05-01), Sessler et al.
patent: 4773091 (1988-09-01), Busche et al.
patent: 4850016 (1989-07-01), Groves et al.
patent: 4862507 (1989-08-01), Woodard
patent: 4885773 (1989-12-01), Stottlemyer et al.
patent: 4937877 (1990-06-01), Pocock et al.
Application Ser. No. 455,128 filed Dec. 22, 1989.
Knowles Electronics, Inc.-Technical Bulletin TB-21 "EB Directional Hearing Aid Microphone Application Notes".
Baumhauer, Jr. John C.
McAteer Jeffrey P.
Rosebrock Frederick A.
Sachs Richard M.
AT&T Bell Laboratories
Dwyer James L.
Morra Michael A.
Shehata M.
LandOfFree
Directional microphone assembly does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Directional microphone assembly, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Directional microphone assembly will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1695747