Patent ID: 8571239

Claim:
A microphone package, comprising a substrate; an MEMS microphone chip having a membrane, said microphone chip being mounted on top of the substrate; a cover, which is seated on top of the substrate and encloses the microphone chip between itself and the substrate; at least one sound entry opening through the substrate or the cover; and a front volume in front of the membrane, said front volume being connected to the sound entry opening via a channel, wherein the at least one sound entry opening, the channel and the front volume form a cavity system and have a geometry defined such that an air friction arises and the cavity system forms an acoustic low-pass filter having a −3 dB attenuation point below the natural resonances of the membrane and the package, and wherein the −3 db attenuation point of the acoustic low-pass filter is at a frequency of 75% or less of the natural resonance of the membrane.