In-Ear Earphone Dual Sound Path Filter Segmentation
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Solution Overview
Problem
Existing in-ear earphones with multiple transducers face challenges in easily replacing and adapting filters without affecting the performance of the other transducers, leading to complications in user-specific acoustic tuning and earwax prevention.
Innovation Solution
The implementation of a cylindrical separating part that divides the common sound path into inner and annular outer sound paths, using separate disk-shaped filters for each, allowing for easy adjustment and replacement without considering the filter's angle position, and enabling individual tuning of each transducer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple transducers are positioned in the sound path to improve frequency transmission, then sound transmission quality is improved, but the space available for filter placement is reduced and filter replacement becomes complicated
Solution Approach 1:
The sound path is segmented into multiple independent channels (first sound path for BA transducer, second sound path for dynamic transducer) that run parallel through the earphone body. Each channel has its own filter placement area, allowing filters to be replaced independently without affecting other transducers or channels.
Solution Approach 2:
The filters are positioned in nested relationships within the sound paths - filters are placed within the sound channels in a compact arrangement that utilizes the available space efficiently while maintaining independent access to each filter for replacement.
2Device complexity
If a common sound path is used for multiple transducers to simplify structure, then device complexity is reduced, but individual acoustic tuning for each transducer becomes difficult
Solution Approach 1:
The sound path is divided into separate first and second sound paths that run parallel through the earphone body. Each sound path is acoustically independent, allowing separate filtering and tuning for each transducer while maintaining a relatively simple overall structure.
Solution Approach 2:
Instead of using a single sequential sound path, the design transitions to a multi-dimensional arrangement with parallel sound paths. This allows multiple transducers to have independent acoustic control planes while maintaining compact spatial integration.
3Area of stationary object
If filters are positioned in a shared sound path area, then space utilization is improved, but filter replacement requires consideration of angle position and affects other transducers
Solution Approach 1:
The filter placement areas are segmented into distinct first and second filter placement areas corresponding to separate sound paths. Each filter can be accessed and replaced independently without requiring precise angle positioning relative to other transducers, simplifying the replacement procedure.
4Reliability
If acoustic friction is added to prevent earwax penetration and improve sound transmission, then earwax protection and sound quality are improved, but the complexity of acoustic tuning increases
Solution Approach 1:
Acoustic friction elements are applied locally at specific filter placement areas within the sound paths. This localized approach provides earwax protection and sound quality improvement at critical points without requiring complex acoustic tuning throughout the entire earphone structure.
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 solution allows for improved acoustic tuning and wear comfort, reduced production costs, and simplified user adjustments, as the filters can be easily replaced or modified to accommodate user preferences and hearing needs.
Implementation Method 1
an in-ear earphone having at least two electroacoustic transducers
Implementation Method 2
an acoustic filter disk (13) lying in front of the sound opening (9) and having a first filter area (13a) and a second filter area (13b)
Data Source
Figure 1
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AI summary
The invention concerns an in-ear earphone with a plug area (10) with at least a sound opening (9) and an outer area (11) and with at least two electroacoustic transducers (1, 12), one transducer (12) being arranged in the plug area (10) and at least a second transducer (1) lying in the sound path (3). The invention is characterized in that a separating part (15) is provided between the first transducer (12) and the sound opening (9), through which an inner sound path (16) for the first transducer (12) and a sound path (3) enclosing this sound path with an annular cross-section for the at least second transducer (1) is formed, and in that a filter disk (13) is arranged in the sound opening (9), in which an acoustic friction (13b, 13a) is provided for each of the two sound paths (3, 16).