AUDIO SYSTEMS, DEVICES, MEMS MICROPHONES, AND METHODS THEREOF
In one embodiment, a MEMS microphone can be coupled to an acoustic horn to provide various benefits and improvements including, but not limited to, at-a-distance acoustic signal reception with improvements in signal-to-noise ratio and directional preference.
1 . An audio system, comprising:
a MEMS microphone package, wherein the MEMS microphone package comprises a substrate having a first surface and a second surface opposite the first surface, and wherein the substrate also comprises a port hole extending through the substrate from the first surface to the second surface;
a pressure-sensitive diaphragm within the MEMS microphone package;
a parabolic acoustic amplifying structure coupled to the second surface of the substrate, wherein the parabolic acoustic amplifying structure comprises a first opening at an apex of the parabolic acoustic amplifying structure, a second opening opposite the first opening, and an interior surface forming an acoustic channel extending between the first opening and the second opening, wherein a portion of the port hole overlays at least a portion of the first opening of the parabolic acoustic amplifying structure, wherein the interior surface of the parabolic acoustic amplifying structure forms a parabolic surface, and wherein the parabolic acoustic amplifying structure comprises a material facilitating acoustic amplification.
2 . The audio system of claim 1 , wherein a portion of the acoustic channel extending from the first opening of the parabolic acoustic amplifying structure to the second opening of the parabolic acoustic amplifying structure, extends substantially perpendicular to the second surface of the substrate.
3 . The audio system of claim 2 , wherein a portion of the acoustic channel includes at least one bend.
4 . The audio system of claim 1 , wherein the cross-sectional area defined by the parabolic acoustic amplifying structure increases in a stepped manner along at least a portion of the length of the parabolic acoustic amplifying structure from the first opening to the second opening.
5 . The audio system of claim 1 , wherein the parabolic acoustic amplifying structure is integral with the substrate.
6 . The audio system of claim 1 , wherein the parabolic acoustic amplifying structure is configured to substantially amplify sound frequencies above the audible frequencies.
7 . The audio system of claim 1 , wherein the parabolic acoustic amplifying structure is configured to substantially amplify sound frequencies within the audible frequencies.
8 . The audio system of claim 1 , wherein the parabolic acoustic amplifying structure is configured to substantially amplify sound frequencies above the audible frequencies.