Sound Generator Acoustic Cavity Segmentation for High-Frequency Noise Control
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Solution Overview
Problem
The existing sound generators in portable electronic devices face issues with high-frequency sound amplification due to resonance in the front cavity, affecting sound quality and causing discomfort.
Innovation Solution
The sound generator design includes a housing with a separation plate that divides the acoustic cavity into a front and back cavity, utilizing adjustable through holes to absorb specific frequency sound waves, introducing counter-phase acoustic waves to improve absorption and equalize air pressure, thereby reducing high-frequency noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the speaker unit is placed in the acoustic cavity with front sound radiation mode, then the sound output is enhanced, but high-frequency resonance occurs in the front cavity causing noise amplification
Solution Approach 1:
The acoustic cavity is segmented into a front cavity and a back cavity using a partition plate. The partition plate includes a through hole that allows controlled acoustic coupling between the two cavities. This segmentation enables the back cavity to function as a resonance control chamber, absorbing harmful high-frequency resonances while the front cavity maintains sound radiation capability.
Solution Approach 2:
The through hole in the partition plate acts as an intermediary element between the front cavity and back cavity. It allows acoustic energy to transfer between the cavities, enabling the back cavity to absorb high-frequency noise while maintaining the overall acoustic performance of the speaker system.
2Power
If the front cavity volume is increased to improve sound quality, then low-frequency response is enhanced, but high-frequency resonance becomes more pronounced
Solution Approach 1:
By dividing the acoustic cavity into front and back sections, the patent allows independent optimization of each cavity's volume and acoustic characteristics. The front cavity can be designed for sound radiation and low-frequency response, while the back cavity serves as a resonance absorption chamber, eliminating the trade-off between cavity volume and resonance control.
Solution Approach 2:
The patent converts the harmful high-frequency resonance that occurs in the front cavity into a beneficial effect by allowing it to transfer through the partition plate's through hole into the back cavity, where it is absorbed. This transforms the resonance problem into a controlled acoustic energy transfer mechanism that improves overall sound quality.
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 design effectively absorbs high-frequency noise, enhancing sound quality by adjusting resonance frequencies and improving the overall sense of hearing.
Implementation Method 1
due to the resonance of the front cavity, the high-frequency signals and high-frequency noises are amplified
Implementation Method 2
utilizing adjustable through holes to absorb specific frequency sound waves
Implementation Method 3
The sound generator is provided with a sound channel arranged through the side wall for being communicated with the front cavity
Data Source
AI summary
A sound generator includes a housing with an acoustic cavity and including a mounting base and a separation plate extending from the mounting base to the outside of the housing; a speaker unit accommodated in the acoustic cavity and being mounted on the mounting base; a front cavity and a back cavity formed by acoustic cavity divided by the mounting base, the speaker unit and the separation plate; and at least one cavity extending from the mounting base and/or the separation plate. The cavity has at least a first through-hole for communicating the cavity with the front cavity and at least a second through-hole for communicating the cavity with the back cavity.