Audio systems, devices, MEMS microphones, and methods thereof
View Patent ↗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 MEMS microphone within the MEMS microphone package; and,
an acoustic horn having a throat opening, a mouth opening, an inner surface, and an outer surface, wherein the throat opening is attached to the second surface of the substrate and encloses the port hole, and wherein the interior surface of the acoustic horn defines a cross-sectional area that increases along the length of the acoustic horn from the throat opening to the mouth opening, and wherein the acoustic horn comprises a silicone material.
2. The audio system of claim 1 , wherein a ratio of an interior cross-sectional area at the mouth opening to an interior cross-sectional area at the throat opening is between 4:1 and 25:1.
3. The audio system of claim 1 , wherein the acoustic horn has an effective length between 40 mm and 250 mm.
4. The audio system of claim 1 , wherein a portion of an acoustic channel extending from the throat opening of the acoustic horn to the mouth opening of the acoustic horn, extends substantially perpendicular to the second surface of the substrate.
5. The audio system of claim 4 , wherein a portion of the acoustic channel includes at least one bend.
6. The audio system of claim 1 , wherein the acoustic horn is oriented to preferentially receive sound arriving from the front of a user of the audio system.
7. The audio system of claim 1 , further comprising a second acoustic horn coupled to the acoustic horn and the MEMS microphone, wherein the second acoustic horn is configured to share in common the throat opening of the acoustic horn, and wherein the acoustic horn and the second acoustic horn are configured to point in different directions.
8. The audio system of claim 1 , wherein the cross-sectional area that increases along the length of the acoustic horn from the throat opening to the mouth opening, increases in a stepped manner along the length of at least a portion of the acoustic horn.
9. The audio system of claim 1 , wherein the acoustic horn forms an ear hook configured to position a hearing aid relative to an ear of a user of the hearing aid.
10. The audio system of claim 1 , wherein the silicone material is a silicone rubber material.
11. The audio system of claim 1 , wherein the shape of the interior surface of the acoustic horn forms a parabolic horn.
12. The audio system of claim 1 , wherein the acoustic horn is integral with the substrate forming a monolithic structure.
13. The audio system of claim 1 , wherein the acoustic horn is configured to substantially amplify sound frequencies above the audible frequencies.
14. The audio system of claim 1 , wherein the acoustic horn is configured to substantially amplify sound frequencies within the audible frequencies.
15. 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 MEMS microphone within the MEMS microphone package; and,
an acoustic horn having a throat opening, a mouth opening, an interior surface, and an outer surface, wherein the throat opening is attached to the second surface of the substrate and encloses the port hole, and wherein the interior surface of the acoustic horn defines a cross-sectional area that increases along the length of the acoustic horn from the throat opening to the mouth opening, and wherein the acoustic horn comprises a rubber material.
16. The audio system of claim 15 , wherein the shape of the interior surface of the acoustic horn forms a parabolic horn.
17. The audio system of claim 15 , wherein the acoustic horn is configured to substantially amplify sound frequencies above the audible frequencies.