Audio Jack State Detection for Plug Type and Water Ingress
Solution Overview
Problem
Existing state detection methods for audio interfaces require multiple detection circuits, leading to increased power consumption and inefficiency in determining the connector type of audio equipment and the water ingress state of audio jack sockets.
Innovation Solution
A state detection circuit that uses a first voltage detection circuit to determine the water ingress state by detecting voltage across two contacts of the audio jack socket, and a second voltage detection circuit to determine the connector type by detecting voltage on a contact connected to the fourth pole of the audio plug, without requiring extra contacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple detection circuits are used to detect connector type and water ingress state, then detection accuracy is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic detection by activating detection circuits only when needed (e.g., when audio equipment is connected). The detection is performed in stages: first detecting connector presence, then determining connector type, and finally checking for water ingress only when appropriate. This periodic action reduces power consumption compared to continuous operation of multiple detection circuits.
Solution Approach 2:
The detection process is segmented into multiple stages using different detection circuits for different purposes. The first detection circuit detects connector presence and type using impedance measurement, while the second detection circuit detects water ingress state. By segmenting the detection functions and activating only the necessary circuits at each stage, the patent reduces overall power consumption while maintaining detection accuracy.
2Device complexity
If impedance detection is used to detect both connector type and water ingress state, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent divides the detection function into two separate detection circuits: a first detection circuit dedicated to connector type detection via impedance measurement, and a second detection circuit dedicated to water ingress state detection. This segmentation allows each circuit to be optimized for its specific detection task, improving measurement precision for each individual detection while keeping the overall device complexity manageable through functional separation.
Solution Approach 2:
The patent introduces a control circuit as an intermediary that coordinates the operation of multiple detection circuits. The control circuit manages the timing and activation of different detection circuits based on detection needs, enabling accurate detection of both connector type and water ingress state without requiring all circuits to operate simultaneously, thus balancing device complexity and measurement precision.
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
The solution effectively reduces power consumption by eliminating the need for multiple detection circuits, while accurately identifying the connector type and water ingress state, making it suitable for existing audio jack sockets.
Implementation Method 1
detecting a voltage across two contacts (311, 315) of the audio jack socket (300)
Implementation Method 2
detecting a voltage on a contact (314) on the audio jack socket (300) that is connected to the fourth pole (214) of the audio plug (200)
Implementation Method 3
when water enters the audio jack socket, there may be conduction between contacts of the audio jack socket
Data Source
Figure 1A
Figure 1B
Figure 2A~2B
AI summary
A state detection device (100) in an audio interface (10) includes: a first voltage detection circuit (110), a second voltage detection circuit (120) and a state determination circuit (130). The first voltage detection circuit (110) is for detecting a voltage across a first contact (311) and a second contact (315) an audio jack socket (300) to generate a first detection value (DET1). The second voltage detection circuit (120) is for detecting a voltage on the third contact (314) of the audio jack socket (300) to generate a second detection value (DET2). The state determination circuit (130) is for determining a water ingress state of the audio jack socket (300) according to the first detection value (DET1), and a connector type of an audio plug (200) that is inserted into the audio jack socket (300) according to the second detection value (DET2).