Mass loaded earbud with vent chamber
Intra-concha earphones are disclosed. In an embodiment, an intra-concha earphone includes a housing having a rear space divided into a back volume, a bass duct, and a vent chamber between a driver and a rear wall. The vent chamber may be acoustically coupled with the back volume through both an acoustic port and the bass duct. Furthermore, the vent chamber may be acoustically coupled with a surrounding environment through a vent port, which may be a sole acoustic opening in the rear wall. Thus, sound emitted by the driver may propagate through the acoustic port and the bass duct to meet in the vent chamber before being discharged through the vent port to the surrounding environment. Other embodiments are also described and claimed.
1. An intra-concha earphone, comprising:
a driver configured to convert an electrical audio signal into a sound;
a housing having the driver therein, wherein the housing includes a housing wall laterally surrounding the driver, the housing including a sole acoustic port in the housing wall behind the driver, wherein the housing wall contains a rear space between the driver and a rear wall of the housing wall, and wherein the sole acoustic port is an only opening in the rear wall through which the sound leaves the rear space; and
a partition in the rear space between the driver and the sole acoustic port, wherein the partition includes a groove traversing a back surface of the partition to define an acoustic channel between the back surface and an inner surface of the rear wall.
2. The intra-concha earphone of claim 1 , wherein the inner surface of the rear wall laterally surrounds a rim of the partition, and wherein the partition divides the rear space into a first volume and a second volume.
3. The intra-concha earphone of claim 2 , wherein the sole acoustic port is a sole externally visible opening in the rear wall.
4. The intra-concha earphone of claim 3 , wherein the sole acoustic port is the only opening in the rear wall between the first volume and a surrounding environment.
5. The intra-concha earphone of claim 4 , wherein the first volume is behind the partition, and wherein the second volume is in front of the partition between the driver and the surface of the partition.
6. The intra-concha earphone of claim 2 , wherein the partition includes one or more apertures extending between the first volume and the second volume.
7. The intra-concha earphone of claim 2 further comprising signal processing circuitry in the housing between the driver and the rear wall.
8. The intra-concha earphone of claim 7 further comprising a microphone in the rear space and electrically coupled to the signal processing circuitry.
9. The intra-concha earphone of claim 8 , wherein the microphone faces the sole acoustic port.
10. An intra-concha earphone, comprising:
a driver configured to convert an electrical audio signal into a sound;
a housing having the driver therein, the housing including a rear wall containing a rear space behind the driver, wherein the housing includes a sole acoustic port in the rear wall, and wherein the sole acoustic port is an only opening in the rear wall through which the sound leaves the rear space; and
a partition in the rear space, wherein the partition extends through the rear space to provide a first volume and a second volume, wherein the partition includes a groove traversing a back surface of the partition to define an acoustic channel between the back surface and an inner surface of the rear wall, and wherein the sole acoustic port is the only opening in the rear wall between the first volume and a surrounding environment.
11. The intra-concha earphone of claim 10 , wherein the sole acoustic port is a sole externally visible opening in the rear wall.
12. The intra-concha earphone of claim 10 , wherein the first volume is laterally surrounded by the rear wall on a first side of the partition, wherein the second volume is laterally surrounded by the rear wall on a second side of the partition, and wherein the first volume is acoustically coupled to the second volume.
13. The intra-concha earphone of claim 10 , wherein the partition includes one or more apertures extending between the first volume and the second volume.
14. The intra-concha earphone of claim 10 further comprising signal processing circuitry in the housing between the driver and the rear wall.
15. The intra-concha earphone of claim 14 further comprising a microphone in the rear space and electrically coupled to the signal processing circuitry, wherein the microphone faces the sole acoustic port.
16. An intra-concha earphone, comprising:
a driver configured to convert an electrical audio signal into a sound;
a housing having the driver therein, the housing including a rear wall containing a rear space behind the driver, wherein the housing includes a sole acoustic port in the rear wall, and wherein the sole acoustic port is an only opening in the rear wall through which the sound leaves the rear space;
a partition in the rear space between the driver and the sole acoustic port, wherein the partition includes a groove traversing a back surface of the partition to define an acoustic channel between the back surface and an inner surface of the rear wall; and
a microphone in the rear space, wherein the microphone faces the sole acoustic port.
17. The intra-concha earphone of claim 16 , wherein the partition is between a first volume of the rear space and a second volume of the rear space, and wherein the sole acoustic port is the only opening in the rear wall between the first volume and a surrounding environment.
18. The intra-concha earphone of claim 17 , wherein the sole acoustic port is a sole externally visible opening in the rear wall.
19. The intra-concha earphone of claim 17 , wherein the partition includes one or more apertures extending between the first volume and the second volume.
20. The intra-concha earphone of claim 16 further comprising signal processing circuitry in the housing between the driver and the rear wall, wherein the signal processing circuitry is electrically coupled to the microphone.
21. The intra-concha earphone of claim 1 , wherein the groove includes one or more of a straight groove or a curvilinear groove.
22. The intra-concha earphone of claim 10 , wherein the groove includes one or more of a straight groove or a curvilinear groove.
23. The intra-concha earphone of claim 16 , wherein the groove includes one or more of a straight groove or a curvilinear groove.