Patent ID: 11902727
Assignee: APPLE INC.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  B | IPC B  H

Claim 11:
12. A microphone module, comprising:
a substrate;
a cover mounted to the substrate and at least partially defining a back volume of the microphone module,
a front volume that is separated from the back volume by a sound-responsive element and that is fluidly coupled to a first opening in the substrate;
a non-porous membrane that defines a sealed volume that is fluidly coupled to the front volume via the first opening, and that provides a liquid-resistant seal between the front volume and a first environment external to the microphone module on a first side of the substrate;
a second opening in the substrate that extends from the sealed volume defined by the non-porous membrane, through the substrate, to a second environment external to the microphone module on an opposing second side of the substrate; and
an inductive filter at least partially defined in the substrate, the inductive filter having a first port coupled to the second opening, a second port coupled to the second environment, and a serpentine fluid pathway within the substrate from the first port to the second port.