Woofer Extension System With Folded Acoustic Channels
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Solution Overview
Problem
The challenge is to enhance the woofer sound performance in portable electronic devices, such as tablets, where the limited thickness and space constraints hinder the effective transmission of low-frequency sounds below 600 Hz, affecting user experience.
Innovation Solution
An extension system for the woofer is designed using a wave formula for plane waves to compute the cut-off frequency and determine the channel length and cross-sectional area, allowing for a front channel with a bass hole and a sealed rear channel, which are fitted into the device to optimize woofer sound transmission within limited space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the speaker volume is reduced to make the device thinner, then the portability and thinness of the device is improved, but the woofer sound quality and low-frequency transmission below 600 Hz deteriorates
Solution Approach 1:
The patent extends the channel structure from a simple planar configuration to a three-dimensional folded channel design. The channel includes a first section extending from the woofer, a second section connected to the first section, and a third section connected to the second section, creating a folded path that increases the effective channel length and volume without increasing the device thickness. This dimensional transformation allows the channel to occupy additional spatial dimensions, thereby improving woofer sound quality while maintaining device thinness.
2Reliability
If the channel volume is increased to improve woofer sound transmission, then the low-frequency sound quality is improved, but the available space inside the device is reduced
Solution Approach 1:
The patent implements a folded channel structure where the channel sections are arranged in a nested or folded configuration within the device body. The first section, second section, and third section are positioned to fold back on themselves or nest within the device thickness, allowing the channel to achieve a larger effective volume and length while occupying minimal device internal space. This nesting approach enables the channel to utilize the three-dimensional space efficiently without reducing the overall device footprint.
3Ease of manufacture
If a traditional woofer channel design is used, then the structure is simple and easy to manufacture, but the cut-off frequency remains above 600 Hz and woofer sound quality deteriorates
Solution Approach 1:
The patent divides the channel into multiple discrete sections: a first section extending from the woofer, a second section connected to the first section, and a third section connected to the second section. Each section can be independently designed and manufactured, then assembled to form the complete folded channel structure. This segmentation allows for easier manufacturing and assembly while achieving the complex folded geometry needed to lower the cut-off frequency below 600 Hz and improve woofer 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 approach enables the transmission of woofer sounds even in thin devices, ensuring a satisfactory user experience by maintaining or improving sound quality, particularly in low-frequency ranges, as demonstrated by the increased diaphragm amplitude and acoustic pressure.
Implementation Method 1
A cut-off frequency is computed based on the predetermined volume and a wave formula of plane waves
Data Source
AI summary
An extension system of a woofer suited for a portable electronic device is provided. The extension system of woofer includes the woofer, a front channel, and a rear channel disposed in a body of the portable electronic device. The rear channel is a sealed space, a volume of the front channel is greater than a volume of the rear channel, and the front channel has a bass hole formed on a surface the body. A design method of an extension system of a woofer is also provided.