Baffled microphone assembly

H - Electricity – 04 – R

Patent

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Details

H04R 1/28 (2006.01) H04M 1/19 (2006.01) H04R 1/38 (2006.01) H04R 19/04 (2006.01)

Patent

CA 2157263

A second-order differential (SOD) microphone includes a first-order differential (FOD) microphone element installed in a housing. A pair of front sound conduits extend from respective ports to a chamber on the front side of the microphone diaphragm, and a pair of rear sound conduits extend from respective ports to a chamber on the rear side of the microphone diaphragm. The two front ports and the two rear ports are all substantially collinear along a minor axis, with the rear ports intermediate the front ports or the front ports intermediate the rear ports. The respective acoustic transfer functions from each port to the microphone diaphragm are equivalent. The microphone response is approximately proportionalto the second spatial derivative, along the minor axis, of a sample acoustic pressure field.

L'invention est un microphone différentiel du deuxième ordre qui comprend un microphone du premier ordre installé dans un logement. Une paire de canalisations acoustiques frontales relie des ports individuels à une chambre placée en amont du diaphragme du microphone, et une paire de canalisations acoustiques arrière relie des ports individuels à une chambre placée en aval du diagramme du microphone. Les deux ports avant et les deux ports arrière sont essentiellement colinéaires par rapport à un axe mineur, les ports arrière se trouvant entre les ports avant ou les ports avant se trouvant entre les ports arrière. Les fonctions de transfert acoustique de chacun des ports au diagramme du microphone sont équivalentes. La réponse du microphone est approximativement proportionnelle à la seconde dérivée spatiale du champ de pression acoustique dans la direction de l'axe mineur.

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