Earphone Biosensor Noise Reduction via Spatial Segmentation
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Solution Overview
Problem
Existing earphones with biosensors face challenges in accurately measuring biological information due to noise interference from vibrations, which affects the precision of measurements.
Innovation Solution
An earphone design featuring a cylindrical barrel with an electroacoustic conversion element, a vibration element on the inner wall, and a biosensor positioned away from the vibration source, allowing for accurate biological information measurement by minimizing noise interference through strategic placement and materials like piezoelectric elements and deformable hooking elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the biosensor is positioned close to the electroacoustic conversion element for compact design, then device complexity is reduced, but measurement precision deteriorates due to vibration noise interference
Solution Approach 1:
The earphone structure is segmented into distinct functional zones: the electroacoustic conversion element is positioned in the lateral direction to contact the tragus, while the biosensor is positioned in the longitudinal direction within the ear canal. This spatial segmentation separates the vibration source from the measurement point, reducing vibration noise interference while maintaining a compact overall structure.
Solution Approach 2:
The patent transitions from a one-dimensional linear arrangement to a two-dimensional spatial distribution by positioning the electroacoustic conversion element laterally and the biosensor longitudinally. This dimensional change allows both components to coexist in a compact form while maintaining adequate separation to minimize vibration interference.
2Power
If the transmission element is made rigid for efficient sound transmission, then power is improved, but object-affected harmful factors worsen due to increased skull vibration and discomfort
Solution Approach 1:
The transmission element uses a piezoelectric element that can dynamically adjust its mechanical properties. By changing the driving frequency and voltage parameters, the piezoelectric element can operate in different modes (extensional or bending vibration), allowing optimization of sound transmission efficiency while controlling the amplitude and frequency of skull vibrations to reduce discomfort.
Solution Approach 2:
The electroacoustic conversion element generates periodic acoustic vibrations at controlled frequencies. This periodic action allows for efficient sound transmission through the bone conduction path while the frequency can be modulated to avoid resonant frequencies that would cause excessive skull vibration and discomfort.
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 earphone effectively reduces noise interference, enhancing the accuracy of biological information measurement by isolating the biosensor from vibrations, allowing for precise data collection without discomfort or excessive skull vibration.
Implementation Method 1
has a built-in electroacoustic conversion element configured to generate an acoustic vibration in response to an electrical signal
Implementation Method 2
a vibration element that is provided on an inner wall of the barrel and configured to vibrate in reaction to the acoustic vibration from the electroacoustic conversion element
Data Source
AI summary
An earphone (1) includes a cylindrical barrel (2) having one end thereof inserted in an ear canal, a transmission element (4) that is provided on a part of the side of the barrel (2), has a part thereof being in contact with a tragus of a human body while the barrel (2) is inserted in the ear canal and has a built-in electroacoustic conversion element (3) configured to generate an acoustic vibration in response to an electrical signal, a vibration element (5) that is provided on an inner wall of the barrel (2) and vibrates in reaction to the acoustic vibration from the electroacoustic conversion element (3), and a biosensor (30).