Ear-Shaped Sound Pressure Measurement System with Vibration Isolation
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Solution Overview
Problem
Existing measurement systems for evaluating electronic devices that transmit sound through vibration struggle to accurately measure sensory sound pressure, as results vary with pressure and angle of contact, failing to closely approximate human body conditions.
Innovation Solution
A measurement system comprising an ear-shaped unit with an artificial external ear canal and a weight unit, combined with vibration and sound pressure detection elements, which stabilizes the ear model and adjusts for varying contact pressures and angles to simulate human ear conditions, allowing simultaneous measurement of vibration and air-conducted sound.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the ear model is held directly by the base, then the structure is simple, but the measurement accuracy deteriorates due to contact vibrations from the base
Solution Approach 1:
The patent introduces a weight unit as an intermediary component between the base and the ear model. This weight unit houses the artificial external ear canal unit and is positioned inside the recess or through-hole of the base without direct contact. The intermediary weight unit isolates the ear model from vibrations generated by the base, thereby improving measurement accuracy while maintaining structural simplicity.
2Measurement precision
If the artificial external ear canal unit contacts the base directly, then the structure is simple, but external vibrations affect measurement accuracy
Solution Approach 1:
The weight unit serves as a mediator that physically separates the artificial external ear canal unit from the base. By housing the ear canal unit inside the weight unit and positioning it within the base's recess or through-hole without direct contact, the system blocks transmission of harmful vibrations from the base to the measurement components, thereby improving measurement precision.
Solution Approach 2:
The weight unit functions as a counterweight structure that absorbs and isolates external vibrations. Its mass and positioning within the base create a vibration-dampening effect, counteracting harmful external vibrations and protecting the sensitive measurement components from interference.
3Reliability
If contact pressure and angle variations are not compensated, then the device structure is simple, but measurement reliability deteriorates
Solution Approach 1:
The patent creates a stable measurement environment by positioning the weight unit inside the recess or through-hole of the base, establishing a consistent geometric relationship between components. This equipotential positioning ensures that contact pressure and angle variations are minimized and standardized, improving measurement reliability without requiring complex active stabilization mechanisms.
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 improves measurement accuracy by stabilizing the ear model and adjusting for contact variations, providing a more reliable assessment of sensory sound pressure, closer to actual human experience, and reducing the impact of external vibrations.
Implementation Method 1
when voltage is applied to the piezoelectric bimorph in the vibrating body, the piezoelectric material expands and contracts in the longitudinal direction, causing the vibrating body to vibrate
Implementation Method 2
a vibration detection element that is placed on the artificial temporal bone part
Implementation Method 3
a sound pressure measuring unit disposed at an end of the artificial external ear canal unit and configured to detect air-conducted sound
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
Included are an ear-shaped unit and a sound pressure measuring unit. The ear-shaped unit includes an ear model imitating a human ear, an artificial external ear canal unit forming an artificial external ear canal that extends from the ear model, and a weight unit configured to house the artificial external ear canal unit therein inside the weight without contacting the artificial external ear canal unit. The sound pressure measuring unit is disposed at an end of the artificial external ear canal unit and is configured to detect air-conducted sound including sound generated by the artificial external ear canal unit.