1974-10-15
1976-11-30
Stellar, George G.
179121D, H04R 132, H04R 140
Patent
active
039951243
ABSTRACT:
A microphone unit comprises a pair of like electroacoustic transducers each having sound-responsive elements in the form of identical diaphragms which are parallel to each other and mounted in a common housing that is open at at least one end for the reception of desired sounds in a direction perpendicular to the diaphragms. The diaphragms are spaced apart a distance no greater than one-quarter of the shortest wavelength of the range of frequencies of the noises to be cancelled; and the housing has further apertures that open into the housing in directions parallel to the planes of the diaphragms, these further apertures being disposed at least one on each side of each diaphragm and the interior ones of said further apertures being spaced apart from their associated diaphragm a distance no greater than one-eighth of the shortest wavelength of the range of frequencies of the noises to be cancelled. The noise sources and channels that the microphone may be exposed to are
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patent: R27487 (1972-09-01), Hassler
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