Protection of integrated low power system designed to monitor the acoustic environment
Various aspects of the present disclosure are directed toward apparatuses, systems and methods that include an acoustic apparatus. The apparatuses, systems and methods may include an acoustic membrane and a protective housing defining an interior space in which the acoustic membrane is received.
1. An acoustic apparatus, comprising:
an acoustic membrane;
a protective housing defining an interior space in which the acoustic membrane is received, the protective housing including indirect pathways extending from outside the protective housing into the interior space of the protective housing to allow acoustic energy from outside the protective housing into the interior space and to the acoustic membrane and the protective housing forming an acoustic gap configured to provide, in combination with the acoustic membrane, a 0.5 dB-20 dB insertion loss in the frequency range from 300 Hz to 5 kHz; and
a microphone configured with the acoustic membrane to sense an acoustic signal and arranged within the interior space,
wherein the protective housing defines the interior space in which the microphone and the acoustic membrane are received such that the acoustic membrane protects the microphone from exposure to water.
2. The acoustic apparatus of claim 1 , wherein the protective housing includes an upper protective housing and a lower protective housing and the acoustic membrane is arranged between the upper protective housing and the lower protective housing and the microphone is arranged within the lower protective housing and the upper protective housing includes one or more openings along an external surface and one or more vanes aligned with the one or more openings, wherein the one or more openings and the one or more vanes form the indirect pathways, and wherein the one or more vanes are configured to direct water spray away from the acoustic membrane.
3. The acoustic apparatus of claim 2 , wherein each of the one or more vanes include a curved surface facing the one or more openings and second and third surfaces extending from the curved surface expanding a width of the one or more vanes.
4. The acoustic apparatus of claim 2 , further comprising a protective structure that is at least one of wrapped about the external surface of the protective housing and arranged within the interior space of the protective housing, the protective structure being configured to enhance at least one of wind noise and spray protection performance.
5. The acoustic apparatus of claim 2 , wherein the upper protective housing and the lower protective housing are configured to interface, and the lower protective housing includes one or more lower openings that are aligned with the openings in the upper protective housing.
6. The acoustic apparatus of claim 5 , wherein a first surface of the one or more vanes interfaces with a first surface of the lower protective housing.
7. The acoustic apparatus of claim 6 , wherein the first surface of the one or more vanes includes a recessed portion relative to the first surface of the one or more vanes, and the first surface of the one or more vanes is configured to bound the acoustic membrane.
8. The acoustic apparatus of claim 7 , wherein the first surface of the lower protective housing includes a first recessed portion and a second recessed portion, and the first recessed portion of the lower protective housing is configured to bound the first surface of the one or more vanes and the second recessed portion of the lower protective housing is configured to bound the acoustic membrane.
9. The acoustic apparatus of claim 2 , wherein each of the one or more vanes includes straight surfaces.
10. The acoustic apparatus of claim 1 , wherein the microphone is a microelectromechanical systems (MEMS) microphone coupled to a flex circuit arranged within the protective housing.
11. The acoustic apparatus of claim 10 , wherein the protective housing includes the acoustic gap between the microelectromechanical systems (MEMS) microphone and the acoustic membrane.
12. The acoustic apparatus of claim 1 , wherein the protective housing is configured to exhibit a 0.5 dB-3 dB insertion loss in the frequency range from 300 Hz to 5 kHz.
13. The acoustic apparatus of claim 1 , wherein the protective housing is arranged external to a cabin of a vehicle; and the microphone is configured to facilitate interaction with the vehicle.
14. The acoustic apparatus of claim 1 , wherein the protective housing is configured to comply with at least one of: International Standard 20653 or International Standard 16750-4 for road vehicles.