Wearable Speaker with Passive Radiator for Low-Frequency Sound
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Solution Overview
Problem
Compact acoustic reproduction systems, such as neck-hung speakers, often lack low-frequency components, resulting in insufficient sound quality and discomfort due to localized sound emission, which is not easily adjustable for varying user physiques.
Innovation Solution
A wearable speaker design featuring a pair of speaker boxes attached to a band with a speaker unit and passive radiator on each, along with a sound guiding unit that includes a recess and aperture to direct sound upward and reduce variations in sound quality due to user movement and physique differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a compact acoustic reproduction system (neck-hung speaker) is used, then portability and wearability are improved, but low-frequency sound reproduction becomes insufficient
Solution Approach 1:
The speaker system is divided into multiple independent speaker boxes (first speaker box, second speaker box, third speaker box) distributed across different body locations. Each box contains its own speaker unit and passive radiator, allowing the compact system to reproduce low-frequency sounds through multiple distributed sources rather than requiring a single large speaker
Solution Approach 2:
The system transitions from traditional horizontal speaker arrangement to a three-dimensional spatial distribution across the body (chest, back, shoulders). This spatial arrangement allows low-frequency sound waves to propagate through the body and environment in multiple directions, compensating for the small size of individual speakers
2Weight of moving object
If sound is emitted locally from a compact speaker, then portability is improved, but sound quality becomes localized and causes discomfort
Solution Approach 1:
The audio output is segmented across multiple speaker boxes positioned at different locations (chest, back, shoulders). This distribution creates a spatially dispersed sound field that envelops the user rather than localizing sound in one spot, reducing discomfort from concentrated acoustic energy
Solution Approach 2:
The system combines acoustic output from multiple speaker boxes with vibration transmission through the body structure. The passive radiators transmit vibrations through the speaker box housing to the user's body, creating a unified full-body audio experience that merges air-conducted and bone-conducted sound paths
3Ease of operation
If the speaker position is fixed on the body, then ease of operation is improved, but sound quality varies with user movement and physique
Solution Approach 1:
The system uses multiple speaker boxes at different body locations rather than a single fixed speaker. This segmentation provides spatial redundancy, ensuring that if one speaker's position shifts, others maintain consistent sound output, thereby improving overall reliability
Solution Approach 2:
The system adds a temporal dimension to sound reproduction by sequentially activating different speaker boxes for different audio channels. This time-based spatial mapping creates a more stable three-dimensional sound field that compensates for positional variations during user movement
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 configuration enhances low-frequency sound reproduction and stability, providing a realistic audio experience while minimizing sound leakage and energy wastage, and is adjustable to accommodate different user anatomies without requiring complex adjustments.
Implementation Method 1
a speaker unit and a passive radiator that are attached on each of the speaker boxes
Implementation Method 2
a speaker unit and a passive radiator that are attached on each of the speaker boxes
Data Source
AI summary
A wearable speaker includes a pair of speaker boxes that are attached on both ends of an attached band and a speaker unit and a passive radiator that are attached on each of the speaker boxes. The attached band is a neck hanging unit that is attachable on a neck of a user of the wearable speaker.