Ear Jack Impedance Detection for Moisture and Earplug Differentiation
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Solution Overview
Problem
Existing electronic devices malfunction when moisture is introduced into the ear jack, causing incorrect detection of earplugs and improper conversion into earphone mode.
Innovation Solution
An apparatus and method that determine the impedance of the ear jack's terminals to differentiate between an earplug and moisture, using a detection circuit to apply a predetermined current and detect impedance variations, thereby preventing malfunction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing detection methods are used to detect earplug insertion, then the device can recognize earplug insertion and convert to earphone mode, but moisture introduction causes incorrect detection and malfunction
Solution Approach 1:
The patent applies parameter changes by measuring impedance (an electrical parameter) to differentiate between earplug and moisture presence. The detection circuit measures the impedance value, and when it exceeds a predetermined threshold, the system determines moisture is present rather than an earplug, preventing incorrect mode conversion.
Solution Approach 2:
The patent replaces simple presence/absence detection with an electrical measurement system that quantifies the physical property (impedance) of the detected object. This substitution allows the system to distinguish between different materials (earplug vs. moisture) based on their electrical characteristics rather than just detecting their presence.
2Reliability
If impedance detection is implemented to differentiate earplug from moisture, then detection accuracy improves, but device complexity increases due to additional detection circuit
Solution Approach 1:
The detection circuit serves multiple functions: it detects the presence of an object in the ear jack, measures the impedance of that object, and provides the basis for mode conversion decisions. By making the detection circuit multi-functional, the patent reduces the need for separate circuits for each function, thereby limiting the increase in device complexity.
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
Effectively prevents electronic device malfunctions by accurately distinguishing between earplug insertion and moisture presence, ensuring correct operation and mode conversion.
Implementation Method 1
determine the impedance of the ear jack's terminals to differentiate between an earplug and moisture, using a detection circuit to apply a predetermined current and detect impedance variations
Data Source
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AI summary
A method for operation of an electronic device and an electronic device are provided. The method includes determining if an object is detected at a first terminal and a second terminal among a plurality of terminals of an ear jack. If an object is detected, the impedance of the second terminal is calculated, and a type of the object is determined according to the calculated impedance. Determining the type of the object comprises, if the calculated impedance is greater than or equal to a set value, determining that moisture is in the ear jack, or, if the determined impedance value is less than a set value, determining that an earplug is in the ear jack.