HAC Testing Probe Positioning with Simulated Human Hand
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for hearing aid compatibility (HAC) testing of mobile communication devices have inherent uncertainty, which hinders the enforcement of compatibility standards and device development, as they do not accurately simulate the human environment in which these devices are used.
Innovation Solution
The use of a simulated hand and head, made of materials with dielectric properties approximating those of a human hand and head, to support and position the mobile communication device during testing, along with a probe system to measure electric and magnetic field strengths at various positions relative to the device's audio output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a simulated hand and head with dielectric properties approximating human tissue are used to support and position the mobile communication device during testing, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent uses simulated hand and head structures made of materials with dielectric properties approximating human tissue to replicate the electromagnetic interaction that would occur with a real human head. This copying approach allows accurate measurement of field strength and SAR values without requiring actual human subjects, thereby improving measurement precision while maintaining a controlled testing environment.
Solution Approach 2:
The patent specifies particular dielectric properties for the simulated hand and head materials to match human tissue characteristics at relevant frequencies. By carefully selecting and adjusting the dielectric parameters (permittivity, conductivity) of the simulation materials, the system achieves accurate electromagnetic field measurements that reflect real-world conditions without the complexity of human subject testing.
2Reliability
If a stand with vice-like grips is used to fix the mobile communication device during testing, then reliability of device positioning is improved, but ease of operation deteriorates
Solution Approach 1:
The patent employs a positioning system with movable grips that can be adjusted to accommodate different mobile device sizes and shapes. The vice-like grips are designed to be adjustable rather than fixed, allowing operators to easily secure various devices while maintaining reliable positioning during testing. This dynamic adjustment capability resolves the contradiction between secure fixation and ease of operation.
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 approach reduces measurement uncertainty by mimicking the human environment, providing more accurate field strength measurements and enhancing the reliability of HAC testing, thereby supporting better compliance with compatibility standards and device development.
Implementation Method 1
a simulated hand and head, made of materials with dielectric properties approximating those of a human hand and head
Implementation Method 2
a probe system to measure electric and magnetic field strengths at various positions relative to the device's audio output
Data Source
AI summary
Embodiments relate to a system for conducting hearing aid compatibility testing of a mobile communication device. The system comprises: a simulated hand for supporting the mobile communication device during the testing; a probe; and a processor. The processor is configured to cause the probe to be positioned in a sequence of positions in proximity to the mobile communication device relative to an audio output component of the mobile communication device during the testing and to determine a field strength of a field radiated by the mobile communication device at the sequence of positions based on an output of the probe at each position.