Audio systems, devices, and methods
In one embodiment of an audio system, a transducer can be coupled to a passive acoustic directional amplifier to provide various benefits and improvements, including improvements to: speech intelligibility, signal-to-noise ratio, effective equivalent input noise, at-a-distance acoustic signal reception, and directional preference. In another embodiment, the shape of an interior surface of a passive acoustic directional amplifier is provided. In another embodiment, the material properties of an interior surface of a passive acoustic directional amplifier are provided.
1 . An audio system, comprising:
a three-dimensional structure comprising a material having a Young's modulus less than or equal to 0.5 GPa, wherein the three-dimensional structure has a concave interior surface forming a cavity, wherein the cavity has an opening and a vertex point located opposite the opening;
a MEMS microphone located within the cavity, wherein a port hole of the MEMS microphone is located within 10 millimeters of the vertex.
2 . The audio system of claim 1 , wherein at least a portion of the MEMS microphone is embedded in the three-dimensional structure.
3 . The audio system of claim 1 , further comprising an interference tube coupled to the three-dimensional structure and extending outward from the three-dimensional structure along the central axis.
4 . The audio system of claim 1 , wherein the audio system is a subsystem of a smart speaker.
5 . The audio system of claim 1 , wherein the audio system is a subsystem of a vehicle.
6 . The audio system of claim 1 , wherein the audio system is a subsystem of an autonomous vehicle.
7 . The audio system of claim 1 , wherein the audio system is a subsystem of a video camera.
8 . The audio system of claim 1 , wherein the MEMS microphone is located within 5 millimeters of the vertex.
9 . The audio system of claim 1 , wherein the opening has a width that is less than the depth of the cavity.
10 . The audio system of claim 1 , wherein the opening has a width that is less than one-half of the depth of the cavity.
11 . The audio system of claim 1 , wherein the interior cavity has a volume less than 40 ml.
12 . The audio system of claim 1 , wherein the interior cavity has a volume less than 7.9 ml.