Earpiece Control Port for Acoustic Isolation
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Solution Overview
Problem
Existing earpieces face challenges in achieving high-fidelity performance across all frequencies without the added manufacturing complexity and cost associated with porting to a controlled volume, which is difficult to maintain in mass-produced models.
Innovation Solution
The use of a control port, with a diameter less than 25% of the output port's cross-sectional area, is introduced to acoustically tune the driver, allowing for optimized acoustic performance without requiring tight manufacturing tolerances on the enclosure volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the driver is vented to a sealed, controlled volume, then the acoustic performance of the earpiece can be tuned, but tight manufacturing tolerances on the controlled volume are required, adding to manufacturing cost and complexity
Solution Approach 1:
The patent changes the parameter of the vent from a large opening requiring sealed volume control to a small controlled opening (0.05-0.25 inch diameter) that provides acoustic tuning without requiring tight manufacturing tolerances on the enclosure volume. This parameter change allows the system to achieve tuned acoustic performance while significantly reducing manufacturing complexity and cost.
Solution Approach 2:
The patent extracts the acoustic tuning function from the sealed enclosure volume and relocates it to the driver vent itself. By making the vent small and controlling its dimensions, the acoustic tuning is achieved at the driver level rather than requiring a precisely controlled sealed volume, thereby separating the tuning function from the enclosure manufacturing requirements.
2Manufacturing precision
If multiple armature drivers are used to achieve high-fidelity performance across all frequencies, then frequency response is improved, but device complexity and cost increase
Solution Approach 1:
The patent changes the parameter of the single armature driver by adding a small controlled vent, which modifies the acoustic impedance and extends the low-frequency response. This parameter change allows a single driver to achieve frequency response characteristics that would otherwise require multiple drivers, thereby reducing device complexity while maintaining high-fidelity performance.
Solution Approach 2:
The patent replaces the mechanical approach of using multiple drivers with a acoustic approach using a small controlled vent. Instead of adding more mechanical driver components to extend frequency response, the system uses acoustic impedance control through the vent to achieve the same goal with a single driver, reducing overall system complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach simplifies the manufacturing process, reduces costs, and maintains desired acoustic performance by isolating the driver's acoustic performance from the enclosure volume, while allowing for easier venting and reduced sensitivity to manufacturing variances.
Implementation Method 1
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
Implementation Method 2
Venting is performed by boring a control port, separate from the output port, into the driver. The exact size of the control port is selected to achieve the desired acoustic performance.
Data Source
AI summary
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.