Dual-Chamber Headset Acoustic Module for Low-Profile Bass
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Solution Overview
Problem
Existing headphones, particularly over-ear models, are bulky and heavy, leading to discomfort and audio performance asymmetry between left and right ear cups due to reduced ear cup size, which compromises bass performance and causes mismatched audio experiences.
Innovation Solution
A dual-chamber concentric design for headset acoustic modules, where each module includes an inner chamber behind the speaker and an outer chamber surrounding it, with vents connecting them, and uses high acoustic impedance load drivers with a two-part diaphragm to maintain audio symmetry and improve performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If ear cup size is reduced to make headphones smaller and lighter, then portability and comfort are improved, but audio performance particularly bass performance deteriorates
Solution Approach 1:
The ear cup is divided into two separate chambers: a first chamber housing the audio driver and a second chamber providing additional acoustic volume. This segmentation allows each chamber to be optimized independently - the first chamber can be compact for portability while the second chamber maintains acoustic performance
Solution Approach 2:
The first chamber containing the audio driver is nested within the larger second chamber. This nested configuration allows the smaller driver chamber to benefit from the acoustic volume of the outer chamber, maintaining bass performance in a compact overall structure
2Volume of moving object
If ear cup size is reduced, then portability is improved, but enclosure volume available for audio driver deteriorates
Solution Approach 1:
The total enclosure volume is segmented into two chambers: a compact first chamber for the driver and a larger second chamber for acoustic volume. This allows the driver to operate in an optimized small space while the outer chamber provides the necessary acoustic environment
Solution Approach 2:
The dual-chamber design extends the acoustic volume in a radial dimension rather than increasing the overall ear cup footprint. The second chamber surrounds the first chamber, adding volume without proportionally increasing the external dimensions
3Adaptability or versatility
If different components are used in left and right ear cups to accommodate size reductions, then individual optimization is improved, but audio symmetry between left and right ear cups deteriorates
Solution Approach 1:
The design uses symmetric dual-chamber configurations in both left and right ear cups, ensuring identical acoustic characteristics. The symmetry principle is applied to maintain matched audio performance while still allowing asymmetric placement of electronic components in non-acoustic areas
4Device complexity
If electronic components like batteries and PCBs are placed in the enclosure to reduce size, then integration is improved, but audio performance deteriorates due to space competition
Solution Approach 1:
Electronic components are extracted from the acoustic chambers and placed in separate non-acoustic spaces or externally. This separation prevents electronic components from interfering with the acoustic volume and driver operation while maintaining compact integration
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 design maintains or enhances audio performance across various frequency ranges while reducing headset size and weight, ensuring matched audio performance between left and right ear cups and minimizing power consumption.
Implementation Method 1
the second volume is fluidly coupled to the first volume via a first set of one or more vents on the inner wall
Implementation Method 2
the side wall defines an opening that retains one of the pair of speakers
Data Source
AI summary
A low profile acoustic module is described. Embodiments include a headset acoustic module having first and second chambers. The first chamber has a side wall and first portion of a back wall, and defining a first volume. The side wall defines an opening sized to retain a speaker, and the first chamber defines a first volume. The second chamber is adjacent the first chamber, and comprises an inner wall, a front wall, and a second portion of the back wall, and defining a second volume greater than the first volume. The second volume is fluidly coupled to the first volume via a first set of vents on the inner wall, the second volume is fluidly coupled to an ambient atmosphere via a second set of vents, and the inner wall comprises at least a portion of the side wall.