Biometric Sound Testing Device Position Accuracy
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Solution Overview
Problem
Conventional physiological sound examination devices face challenges in accurately determining the appropriate measurement position for physiological sounds, particularly due to the need to avoid bones like clavicles and ribs, and difficulties in remote areas where the microphone placement may not be optimal, leading to inaccurate analysis.
Innovation Solution
A physiological sound examination device that uses power ratio comparisons between physiological sounds measured at different sites on the body to determine the appropriateness of the measurement position, with a display unit providing instructions for adjusting the position and light emitting units for visual guidance, and incorporates correction formulas based on physical characteristics to ensure accurate positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor is placed on the body to measure physiological sound, then the physiological sound can be detected, but it is difficult to determine the appropriate measurement position without medical expertise
Solution Approach 1:
The device provides real-time feedback by calculating the power ratio between low frequency band (20-200 Hz) and high frequency band (200-1000 Hz) physiological sounds, comparing it against a reference power ratio, and providing visual feedback through light emitting units (green for appropriate position, red for inappropriate position) to guide the user in adjusting the sensor placement
Solution Approach 2:
The patent replaces the mechanical/subjective method of position determination (based on anatomical knowledge and manual adjustment) with an automated electronic system that uses signal processing, power ratio calculation, and electronic feedback to objectively determine and guide sensor placement
2Reliability
If multiple microphones are placed on the body to support remote diagnosis, then the diagnosis accuracy improves, but the device complexity increases
Solution Approach 1:
The patent introduces an intermediary processing system that receives physiological sound signals from microphones, performs signal processing including power ratio calculation between frequency bands, compares against reference values, and provides automated feedback, thereby enabling reliable remote diagnosis without requiring complex manual intervention or multiple sensors
3Measurement precision
If the measurement position is not appropriate (close to bones or far from midline), then the physiological sound analysis becomes inaccurate, but identifying the correct position is difficult for non-experts
Solution Approach 1:
The system continuously monitors the power ratio of physiological sounds and provides real-time feedback through light emitting units, guiding users to adjust sensor position until the appropriate position is achieved, thereby eliminating the need for expert knowledge of anatomical landmarks
Solution Approach 2:
The patent uses parameter changes in the frequency domain (comparing power ratios between low frequency band 20-200 Hz and high frequency band 200-1000 Hz) to detect measurement position appropriateness, transforming the physical position detection problem into a signal processing parameter comparison problem
Data Source
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AI summary
A physiological sound examination device includes: a physiological sound measurement unit (101); a power calculation unit (2301) which calculates power of a first physiological sound and power of a second physiological sound, the first physiological sound being one of two different kinds of physiological sounds measured by the physiological sound measurement unit (101) in a same time period and the second physiological sound being the other of the two different kinds of physiological sounds; a power comparison unit (2300) which compares first power indicating the power of the first physiological sound and second power indicating the power of the second physiological sound, to calculate a comparison result indicating a ratio or a difference between the first power and the second power; and a determination unit (2304) which determines whether or not a measurement position of the physiological sound is appropriate, by comparing the comparison result with a threshold.