Audio Jack Plug Detection Using Time-Varying Signal Loop
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Solution Overview
Problem
Existing audio plug detection methods require extra connection points and DC voltage sources, increasing circuit complexity, electricity consumption, and costs, while also failing to accurately distinguish between audio plugs and other objects due to shared detection mechanisms.
Innovation Solution
An audio plug detection structure utilizing a time-varying signal generation circuit and comparison circuit within the audio jack, which forms a loop with the audio plug's inside impedance to determine plug insertion without additional connection points, using a modulatable square wave signal to optimize detection accuracy and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a detection connection point and DC voltage source are added to detect audio plug insertion, then detection capability is improved, but device complexity and electricity consumption increase
Solution Approach 1:
The patent combines the detection function with existing connection points (first connection point for audio signal and second connection point for ground) to form a detection loop. By merging detection functionality into the existing audio signal path, no additional detection connection points or DC voltage sources are required, thus improving reliability without increasing device complexity
Solution Approach 2:
The existing connection points and audio signal path are made to serve dual purposes: audio signal transmission and plug insertion detection. The time-varying signal generated by the audio signal source is used both for audio output and for detecting plug insertion through the formation of a detection loop, eliminating the need for separate detection components
2Reliability
If a detection connection point and DC voltage source are added to detect audio plug insertion, then detection capability is improved, but electricity consumption increases
Solution Approach 1:
The patent uses a time-varying signal (periodic audio signal) from the audio signal source to perform detection instead of continuous DC voltage. The detection is accomplished during the periodic signal cycles when the audio plug is inserted, eliminating the need for continuous power consumption by DC voltage sources while maintaining reliable detection capability
Solution Approach 2:
The audio signal source itself provides the detection signal through its time-varying output. The existing audio signal serves dual purposes: driving the audio output and enabling plug insertion detection through the detection loop formation, eliminating the need for separate power-consuming detection power sources
3Ease of operation
If an elastic and conductive connection point is used to detect plug insertion, then detection simplicity is improved, but measurement precision deteriorates because it cannot distinguish audio plug from other objects
Solution Approach 1:
The patent uses the time-varying audio signal to create a detection loop that provides feedback about plug insertion. The audio signal flows through the audio plug's internal impedance and returns through the detection loop, creating a characteristic signal pattern that confirms proper plug insertion. This feedback mechanism ensures not just contact but proper audio plug insertion
Solution Approach 2:
The patent detects plug insertion by monitoring changes in electrical parameters (current flow, impedance) within the detection loop formed by the time-varying audio signal. The audio plug's specific internal impedance creates a characteristic parameter change pattern that distinguishes it from other objects, improving measurement precision while maintaining detection simplicity
Data Source
AI summary
An audio plug detection structure is disclosed, which is adapted for an audio jack corresponding to an audio plug and includes a first and second connection points, a time-varying signal generation circuit, and a comparison circuit. The time-varying signal generation and comparison circuits are connected to the first connection point. When the audio plug is inserted into the audio jack, the first connection point is connected to a first pole of the audio plug and the second connection point is connected to a second pole different from the first pole of the audio plug. Therefore, the time-varying signal generation circuit, the first connection point, an inner impedance circuit of the audio plug and the second connection plug form a loop. The comparison circuit outputs a determination signal indicating the audio plug is inserted by detecting a change of a time-varying signal generated by the time-varying signal generation circuit.