Compact Acoustic Device With Rotatable Resonance Tuning
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Solution Overview
Problem
Existing acoustic devices lack compact designs with adaptable frequency control, often requiring battery power and complex mechanisms for adjusting resonance cavities.
Innovation Solution
An acoustic device with an enclosed resonance cavity within a housing, adjustable via an external mechanism, allowing manual or battery-free control of resonance frequency without altering the device's overall size, using a rotatable part to vary the cavity's size along a circular trajectory.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the resonance cavity is made adjustable to control frequency, then the adaptability of the device is improved, but the device complexity increases
Solution Approach 1:
The resonance cavity is made dynamically adjustable through a rotatable part that changes the cavity's size along a circular trajectory. This dynamic adjustment allows the resonance frequency to be tuned without requiring complex electronic controls or batteries, resolving the contradiction by achieving adaptability through simple mechanical means.
Solution Approach 2:
The adjustment mechanism is designed to be manually operated by the user without requiring external power sources or complex control systems. The rotatable part can be turned by hand to adjust the resonance cavity size, making the device self-sufficient and eliminating the need for batteries or electronic controls.
2Measurement precision
If the resonance cavity size is varied to tune frequency, then the frequency control precision is improved, but the overall device size changes
Solution Approach 1:
The resonance cavity is nested within the housing structure, and the rotatable part is positioned such that it adjusts the cavity size along a circular trajectory inside the housing. This nesting allows the cavity volume to be varied for precise frequency tuning while the overall device size remains constrained by the fixed housing dimensions.
Solution Approach 2:
The adjustment mechanism utilizes a circular trajectory in a different spatial dimension, allowing the resonance cavity size to be changed along a curved path rather than linearly. This dimensional approach enables frequency tuning while maintaining a compact overall device footprint.
3Adaptability or versatility
If an adjustable piston is used to change resonance cavity size, then the frequency adaptability is improved, but the device becomes less compact
Solution Approach 1:
Instead of using a linear piston that extends and retracts, the invention employs a rotatable part that adjusts the resonance cavity size along a circular trajectory. This dynamic circular adjustment achieves the same frequency adaptability while maintaining a more compact device geometry, as the adjustment occurs within a bounded circular path rather than requiring linear extension.
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
Enables precise tuning of acoustic resonance peaks or dips within the human audible spectrum, enhancing or attenuating specific frequencies effectively, while maintaining a compact form factor and eliminating the need for batteries.
Implementation Method 1
The resonance cavity is in acoustic communication with the sound channel. This may cause an acoustic resonance in a frequency transmission spectrum of sound passing through the sound channel
Data Source
Figure 1A~1B
Figure 1C~1D
Figure 2A~2C
AI summary
An acoustic device (100) and method of using such device. A sound channel (11) extends through a housing (10) of the acoustic device (100) between a sound inlet (11i) and a sound outlet (11o). The sound inlet (11i) is configured to receive sound input (Si) from an external environment (Ex). The sound outlet (11o) is configured to deliver sound output (So) that has passed through the sound channel (11) to an ear canal (Ec). A resonance cavity (C) is enclosed within the housing (10) and in acoustic communication with the sound channel (11) for causing an acoustic resonance (A) in a frequency transmission spectrum (So/Si) of sound passing through the sound channel (11). An adjustment mechanism (12) is configured to adjust a size (L1,L2) of the resonance cavity (C) for controlling a frequency (F) of the acoustic resonance (A) in the frequency transmission spectrum (So/Si).