Wearable Speaker Module Directivity Control
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Solution Overview
Problem
Current head-mounted display devices using miniature speakers face challenges such as varying sound quality due to human factors and wearing differences, lack of privacy, and significant left and right channel interference.
Innovation Solution
A speaker module with an enclosure and a driving unit, featuring a front opening and two rear openings, which outputs sound with directivity by forming specific vectors and combining them to create a sum vector that defines the direction of the sound sum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If miniature speakers are used for sound output, then 3D sound performance and spatial sound field are improved, but sound quality varies due to human factors and wearing differences
Solution Approach 1:
The speaker module is divided into multiple independent sound output units (front opening and rear openings) that can be independently controlled. Each opening acts as a separate sound source, allowing precise control of sound radiation patterns to compensate for wearing variations and maintain consistent sound quality across different users and positions.
2Illumination intensity
If miniature speakers are used for sound output, then spatial sound field is improved, but privacy is lost and left and right channel interference increases
Solution Approach 1:
The speaker module employs an asymmetric sound radiation pattern with a front opening and rear openings positioned at different locations and orientations. This asymmetric configuration creates directional sound beams that can be steered to focus sound toward the user's ears while minimizing sound leakage to surrounding areas, thereby reducing channel interference and maintaining privacy.
3Measurement precision
If sound is output from multiple openings, then directivity is achieved, but device complexity increases
Solution Approach 1:
Multiple sound output functions (front and rear sound radiation, directional control, privacy protection) are merged into a single integrated enclosure structure. The front opening and rear openings are combined in one module that houses the driving unit, eliminating the need for separate components and simplifying the overall device structure while achieving complex sound control objectives.
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 directivity of the sound output reduces deviations caused by wearing variations and structural differences in the human body, enhances privacy by isolating the voice, and provides a more realistic and comfortable listening experience.
Implementation Method 1
The driving unit is used to generate sound. The enclosure contains the driving unit and has a front opening, a first rear opening and a second rear opening.
Data Source
AI summary
A speaker module is adapted to be configured to a wearable device. The speaker module includes an enclosure and a driving unit. The driving unit is used to generate sound. The enclosure contains the driving unit. A sound sum of the sound output from a front opening, a first rear opening and a second rear opening of the enclosure has directivity. The connection vectors and the inverse vector of the connection normal vector defined by these openings are added to form a combined vector. A unit vector of the combination vector and a unit vector of a front normal vector facing outwards of the front opening are added to form a sum vector. The direction of the sum vector is the direction of the sound sum.