Nested Acoustic Resonator Chambers for Wider Speaker Bandwidth
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Solution Overview
Problem
Conventional acoustic chambers and radiators are often too large for compact electronic devices, leading to incompatible size differences and a subpar audio experience compared to larger loudspeakers.
Innovation Solution
An acoustic enclosure with a housing defining an acoustic chamber damped by plural resonant chambers, where the resonator is acoustically coupled with the chamber to resonate at a quarter-wavelength frequency, extending the frequency bandwidth of sound emitted and improving sound quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional acoustic chambers and radiators are used, then sound quality and frequency bandwidth are improved, but device size becomes too large for compact electronic devices
Solution Approach 1:
The patent implements nested resonant chambers where a first resonant chamber is positioned within a housing and a second resonant chamber is positioned within the first resonant chamber. This nested configuration allows multiple acoustic chambers to occupy a compact volume, enabling complex acoustic functionality in a small footprint suitable for portable electronic devices.
Solution Approach 2:
The acoustic system is segmented into multiple independent resonant chambers (first and second resonant chambers) with separate tuning mechanisms. Each chamber can be independently designed and tuned to target specific frequency ranges, allowing the overall system to achieve broad frequency coverage without requiring a single large chamber.
2Adaptability or versatility
If conventional acoustic chambers are used, then frequency bandwidth is extended, but device complexity increases
Solution Approach 1:
By nesting the second resonant chamber within the first resonant chamber, the patent extends frequency bandwidth without proportionally increasing device complexity. The nested structure allows shared boundaries and acoustical coupling between chambers, reducing the total material and structural requirements compared to separate chambers.
Solution Approach 2:
The patent incorporates adjustable tuning mechanisms (such as movable plugs or adjustable duct configurations) within the resonant chambers that allow dynamic adjustment of resonant frequencies. This enables the acoustic system to adapt to different frequency requirements without requiring multiple fixed designs, simplifying the overall system architecture.
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
The solution enhances the perceived sound quality by damping resonance at specific frequencies, maintaining sound loudness over a wider range of frequencies and improving the audio experience in compact electronic devices.
Implementation Method 1
The acoustic resonator can be arranged to resonate at a frequency corresponding to a quarter-wavelength resonance of the acoustic chamber to extend a frequency bandwidth of sound emitted within the acoustic chamber.
Implementation Method 2
an acoustic enclosure with a housing defining an acoustic chamber damped by plural resonant chambers
Data Source
AI summary
An acoustic enclosure has a housing at least partially defining an acoustic chamber for an acoustic radiator. The housing defines an acoustic port from the acoustic chamber to a surrounding environment. An acoustic resonator has a first resonant chamber and a second resonant chamber. The acoustic resonator also has a first duct to acoustically couple the first resonant chamber with the acoustic chamber and a second duct to acoustically couple the second resonant chamber with the first resonant chamber. An electronic device can have an electro-acoustic transducer. Circuitry in the electronic device can drive the electro-acoustic transducer to emit sound over a selected frequency bandwidth. Damping provided by the first and the second resonant chambers can de-emphasize one or more frequencies and/or extend a frequency response of the acoustic enclosure to improve perceived sound quality emitted by the electronic device.