Earpiece with acoustic vent for driver response optimization
View Patent ↗An acoustically tuned earpiece is provided. Venting is performed by boring a control port, separate from the output port, into the driver. The diameter of the control port must be sufficiently small to restrict the flow of air into and out of the driver, thus isolating the acoustic performance of the driver from the volume and/or the sealing capabilities of the earpiece enclosure. The exact size of the venting port is selected to achieve the desired acoustic performance. In all cases, the control port has a cross-sectional area that is less than 25 percent of the cross-sectional area of the driver's output port. In order to optimize the size of the control port, an iterative process is preferably used in which the cross-sectional area of the control port is gradually increased while monitoring the performance of the driver compared to a target response.
1. A method of optimizing an earpiece, the method comprising the steps of:
a) characterizing a driver corresponding to the earpiece, wherein an initial driver response is the result of said characterizing step;
b) boring a control port into said driver, wherein said control port has a cross-sectional area, and wherein said cross-sectional area resulting from boring step b) is less than 25 percent of a cross-sectional area corresponding to an output port of said driver;
c) re-characterizing said driver, wherein a step c) driver response is the result of re-characterizing step c);
d) comparing said initial driver response and said step c) driver response to a target driver response;
e) performing step f) if said step c) driver response is closer to said target driver response than said initial driver response is close to said target driver response;
f) increasing said cross-sectional area of said control port, wherein said cross-sectional area resulting from increasing step f) is less than 25 percent of said cross-sectional area corresponding to said output port of said driver;
g) re-characterizing said driver, wherein a step g) driver response is the result of re-characterizing step g);
h) comparing said step g) driver response and a previous driver response to said target response, wherein said previous driver response corresponds to a response of said driver with said cross-sectional area of said control port prior to performing step f);
i) repeating steps f) through h) if said step g) driver response is closer to said target driver response than said previous driver response is close to said target driver response; and
j) ending said earpiece optimizing method if said previous driver response is closer to said target driver response than said step g) driver response is close to said target driver response.
2. The method of claim 1 , wherein step e) further comprises the step of ending said earpiece optimizing method if said initial driver response is closer to said target driver response than said step c) driver response is close to said target driver response.
3. The method of claim 2 , wherein step e) further comprises the step of selecting a non-ported driver configuration as an earpiece optimized configuration if said initial driver response is closer to said target driver response than said step c) driver response is close to said target driver response.
4. The method of claim 1 , wherein step j) further comprises the step of selecting said cross-sectional area of said control port corresponding to said previous driver response as an earpiece optimized configuration.
5. The method of claim 1 , wherein at least steps a), c) and g) are performed while said driver is integrated within said earpiece.
6. The method of claim 1 , wherein at least steps a), c) and g) are performed with said driver separate from said earpiece.
7. The method of claim 1 , wherein step b) further comprises the step of selecting a diameter of less than 0.10 millimeters for said control port.
8. The method of claim 1 , wherein step b) further comprises the step of selecting a diameter of less than 0.05 millimeters for said control port.
9. The method of claim 1 , wherein step b) further comprises the step of selecting a diameter of approximately 0.01 millimeters for said control port.
10. The method of claim 1 , wherein step f) further comprises the step of selecting a diameter increase of at least 0.02 millimeters during said step of increasing said cross-sectional area of said control port.
11. The method of claim 1 , wherein step f) further comprises the step of selecting a diameter increase of approximately 0.01 millimeters during said step of increasing said cross-sectional area of said control port.