Compact Speaker Arrangement for Multi-Channel Audio
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Solution Overview
Problem
Portable electronic devices face challenges in producing high-quality audio sound output while being made smaller and thinner, due to space constraints, which hinders the ability to maintain or improve audio functionality.
Innovation Solution
The implementation of multiple internal speakers in close proximity, each directed into a respective acoustic chamber that outputs sound through a common audio opening in the device's housing, with a structural barrier separating and sealing the chambers to ensure reliable acoustic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple internal speakers are provided in close proximity to produce multi-channel audio output, then audio quality and functionality are improved, but device size and complexity increase
Solution Approach 1:
Multiple acoustic chambers that were traditionally separate are merged into a single integrated housing structure, with speakers positioned in close proximity sharing common structural elements and a unified external opening, reducing overall device volume while maintaining multi-channel audio capability
Solution Approach 2:
Acoustic chambers are nested within the housing structure in a compact arrangement, with each chamber containing a speaker and the chambers being positioned adjacently to maximize space utilization, allowing multiple speakers to fit within a reduced volume
2Reliability
If acoustic chambers are separated by structural barriers to maintain acoustic isolation, then audio channel separation is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The housing structure serves multiple functions simultaneously: it provides mechanical support, forms acoustic chamber boundaries, and creates acoustic isolation barriers, eliminating the need for separate dedicated isolation components and reducing overall structural complexity
Solution Approach 2:
Acoustic isolation is achieved using thin compliant barriers and sealed openings within the housing structure rather than thick rigid partitions, reducing the complexity and volume of isolation structures while maintaining effective acoustic separation between channels
3Volume of moving object
If speakers are positioned in close proximity to reduce device size, then device compactness is improved, but acoustic interference and cross-talk between channels increase
Solution Approach 1:
Acoustic isolation barriers are positioned between closely-spaced speaker chambers to act as intermediaries that prevent sound wave interference and cross-talk between channels, enabling compact speaker placement without compromising audio channel separation
Solution Approach 2:
Acoustic isolation properties are applied locally at specific interfaces between acoustic chambers rather than throughout the entire structure, using compliant barriers and sealed openings only where needed to prevent interference while maintaining overall structural efficiency
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 allows for high-quality, multi-channel audio output from a compact device, maintaining or improving audio performance without increasing device size, by directing sound from adjacent speakers through a shared output opening while maintaining acoustic isolation.
Implementation Method 1
The sound (i.e., pressure waves) produced by each of the internal speakers is directed into a respective acoustic chamber and output via the output audio opening in the housing
Implementation Method 2
at least a portion of the structural barrier can be compliant so as to create a reliable acoustic seal
Data Source
Figure 1
Figure 2~4
Figure 5A~5D
AI summary
A portable electronic device (100) that provides audio sound output from multiple internal speakers (114, 120) to a common output audio opening (108) in a housing of the portable electronic device is disclosed. In one embodiment, the multiple internal speakers (114, 120) are provided in close proximity to one another, such as adjacent to one another, and serve to produce audio sound pertaining to different audio channels. The sound (i.e., pressure waves) produced by each of the internal speakers (114, 120) is directed into a respective acoustic chamber (112, 118) and output via the output audio opening (108) in the housing (102). Accordingly, the acoustic chambers (112, 118) for the multiple internal speakers (114, 122) can each direct their audio sound output to the same output audio opening (108) in the housing (102). The respective acoustic chambers can be formed adjacent to one another with a structural barrier (122) serving to separate the distinct acoustic chambers (112, 118).