Gn Hearing A/s

René Christensen

Emil Holm Knudsen

Gojko Obradovic

Nikolaj Christiansen

A microphone assembly includes: a microphone with a first acoustic port, wherein the microphone is configured to convert acoustic waves into an electric signal; a filter housing with a second acoustic port; and a carrier coupled to the microphone and to the filter housing, wherein the carrier and the filter housing together enclose a cavity with a first acoustic passage fluidly connecting the first acoustic port and the second acoustic port; wherein the cavity comprises an acoustic chamber and a second acoustic passage; and wherein the second acoustic passage is in fluid communication with the first acoustic passage and with the acoustic chamber, and wherein the acoustic chamber and the second acoustic passage together establish a Helmholtz resonator for suppressing acoustic energy within a first frequency band in the acoustic waves propagating through the first acoustic passage, wherein the first frequency band is in an ultrasound frequency domain.

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Valby, Denmark

René Christensen