Multi-transducer Earpiece Perpendicular Flange Acoustic Channel
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Solution Overview
Problem
Existing earpieces with multiple armature drivers face challenges in providing high-fidelity audio performance across all frequencies due to the limitations of single armature drivers and ineffective tuning methods, particularly in compact designs where phase shift considerations are questionable.
Innovation Solution
A multi-transducer earpiece design featuring a sound delivery member with a perpendicular flange that partitions the acoustic delivery channel, aligning high and mid/low frequency transducers with sound delivery tubes, ensuring consistent acoustic pressure and signal mixing within the ear canal, without relying on discrete sound delivery tubes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple armature drivers are used to achieve high-fidelity performance across all frequencies, then audio quality is improved, but device complexity increases
Solution Approach 1:
The audio frequency range is segmented into different bands (high frequency and mid/low frequency), with each band handled by a dedicated transducer. This allows multiple transducers to work in parallel, each optimized for its specific frequency range, thereby achieving high-fidelity performance across the full spectrum while managing complexity through functional division
Solution Approach 2:
The patent transitions from considering phase shift in the time domain to designing the acoustic field geometry in the spatial domain. By carefully designing the acoustic delivery channel and sound damper geometry, the patent achieves coherent signal combination from multiple transducers without requiring complex phase adjustment mechanisms, thus improving audio fidelity while controlling device complexity
2Measurement precision
If acoustic filters are used for tuning each transducer considering phase shift, then frequency response is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent extracts the phase shift consideration from the tuning process by designing the acoustic field geometry such that phase alignment is achieved through spatial arrangement rather than requiring precise adjustment of acoustic filters. This removes the need for complex phase shift tuning while maintaining frequency response quality
Solution Approach 2:
Phase alignment is built into the design from the outset through preliminary geometric configuration of the acoustic delivery channel and sound damper, rather than requiring post-manufacturing adjustment. This preliminary design approach achieves the desired frequency response without imposing stringent manufacturing precision requirements on adjustable components
3Reliability
If discrete sound delivery tubes are used for each transducer, then signal transmission is improved, but device volume increases
Solution Approach 1:
Multiple separate sound delivery tubes are merged into a single integrated acoustic delivery channel with internal partitions. This combining approach maintains the signal transmission benefits of dedicated pathways for each transducer while reducing the overall volume by eliminating redundant tube walls and shared structural elements
Solution Approach 2:
The acoustic delivery channel is designed as a nested structure where the sound damper with its partitions is positioned within the channel, creating space-efficient signal pathways. This nesting arrangement allows multiple transducer outputs to be delivered through a compact, space-efficient geometry rather than requiring separate external tubes
4Adaptability or versatility
If the acoustic delivery channel cross-sectional area varies, then acoustic impedance matching is improved, but acoustic pressure consistency deteriorates
Solution Approach 1:
The acoustic delivery channel is designed with different cross-sectional areas at different locations to optimize local acoustic impedance matching. The sound damper with its perpendicular flange creates localized partitioning that maintains pressure consistency in critical regions while allowing cross-sectional area variation elsewhere for impedance matching, thus achieving both goals through spatially differentiated design
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 enhances audio reproduction by ensuring consistent acoustic pressure and durable signal transmission, improving fidelity and ergonomic fit while minimizing space usage and simplifying assembly.
Implementation Method 1
The cross-sectional area of an ear bud end of the acoustic delivery channel is at least equal to a cross-sectional area of a sound damper end of the acoustic delivery channel such that acoustic pressure is consistent in the acoustic delivery channel
Data Source
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Figure 3(a)~3(b)
AI summary
There is provided a method for optimizing performance of a multi-transducer earpiece, where the multi-transducer earpiece includes a perpendicular flange that partitions the cross sectional area of the acoustic delivery channel in a manner where mixing of signals from both the high frequency transducer and the mid/low frequency transducer is carried out in the ear canal of a user during reproduction of audio signals.