Headset Acoustic Channel Layout for Compact High-Quality Sound
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Solution Overview
Problem
The challenge of mounting a speaker in a headset, such as an earphone or intelligent glass, while ensuring high sound quality and compact design is addressed by the innovative structure of the headset, which includes a diaphragm and a wearing part with a cavity and sound output port, featuring an acoustic channel that extends curvedly with increasing sectional area towards the output port.
Innovation Solution
The headset design incorporates a speaker with a diaphragm facing an acoustic channel that extends curvedly, with the sectional area increasing towards the sound output port, allowing for a compact and ergonomic fit, reducing sound leakage, and enhancing sound quality by controlling pressure and amplitude variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the speaker is mounted close to the ear in a compact headset, then the sound can directly enter the ear for good quality, but the space for arranging the speaker is limited
Solution Approach 1:
The acoustic channel is nested within the wearing part housing, with the speaker positioned in the accommodating room formed by the housing. The acoustic channel extends from the speaker diaphragm through the housing to the sound output port, efficiently utilizing the limited internal space of the headset while maintaining proper acoustic pathways for high-quality sound transmission.
Solution Approach 2:
The acoustic channel extends curvedly in a reference plane rather than in a straight line, transitioning from a one-dimensional linear path to a two-dimensional curved path. This allows the acoustic channel to navigate around internal obstacles and fit within the compact headset volume while maintaining sufficient length for proper acoustic impedance matching and sound quality.
2Volume of stationary object
If the acoustic channel has a small cross-sectional area to fit in compact space, then the headset size is reduced, but sound leakage increases and sound quality deteriorates
Solution Approach 1:
The cross-sectional area of the acoustic channel varies dynamically along its length, being smaller near the speaker diaphragm and gradually increasing toward the sound output port. This dynamic area variation optimizes acoustic impedance matching at different positions, preventing sound leakage and distortion while maintaining compact overall headset dimensions.
Solution Approach 2:
The geometric parameter of the acoustic channel (cross-sectional area) is changed along its length, transitioning from a narrow throat near the speaker to a wider opening at the sound output port. This parameter change follows acoustic principles for efficient sound transmission, reducing reflections and impedance mismatches that would cause sound leakage and quality degradation.
3Ease of manufacture
If the acoustic channel extends straightly for simple manufacturing, then the manufacturing process is simplified, but the sound output becomes distorted and loudness decreases
Solution Approach 1:
The acoustic channel is designed with a curved extension in the reference plane rather than a straight line. This curvature allows the channel to follow the natural contours of the ear and optimize sound wave propagation paths, reducing distortion and enhancing loudness while remaining manufacturable through standard molding processes.
4Volume of stationary object
If the speaker is arranged in a small accommodating room, then the headset compactness is improved, but the speaker configuration requirements increase and cost rises
Solution Approach 1:
The wearing part housing serves multiple functions: it provides the structural framework of the headset, forms the accommodating room for the speaker, and creates the acoustic channel pathway. This multi-functionality reduces the number of separate components needed, simplifying speaker configuration while maintaining compactness.
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 achieves a more natural sound output with reduced distortion and increased loudness, while minimizing the speaker's configuration requirements and cost, and ensuring a comfortable fit for the user.
Implementation Method 1
the acoustic channel extends curvedly in a reference plane, and in the extending direction of the acoustic channel, a sectional area of the acoustic channel at a position close to the sound output port is greater than a sectional area of the acoustic channel at a position away from the sound output port
Implementation Method 2
a sectional area of the acoustic channel at a position close to the sound output port is greater than a sectional area of the acoustic channel at a position away from the sound output port
Data Source
AI summary
Provided is a headset including a speaker and a wearing part. The speaker includes a diaphragm. The wearing part includes a cavity and a sound output port. The cavity includes an accommodating room and an acoustic channel. The speaker is arranged in the accommodating room. The diaphragm is arranged facing the acoustic channel. The sound output port is arranged on an end of the acoustic channel away from the accommodating room. The acoustic channel extends curvedly in a reference plane. In the sound propagation direction, the cross-sectional area of the acoustic channel progressively increases.