Microphone Control via Impedance Thresholds for Accessory Detection
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Solution Overview
Problem
Electronic devices deactivate their microphones when a monopod or similar accessory without a microphone is connected via a quadrupole audio plug, leading to incorrect microphone operation.
Innovation Solution
The electronic device recognizes external accessories connected through an earphone connector based on electrical characteristics, activating or deactivating the microphone accordingly, and performing different operations depending on the type of accessory connected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the electronic device deactivates the microphone when a quadrupole audio plug is connected, then the device can support audio recording through the connected accessory, but the device incorrectly deactivates the microphone even when the accessory does not include a microphone
Solution Approach 1:
The patent changes the detection parameter from simply detecting the presence of a quadrupole plug to measuring the electrical resistance value between specific terminals. By measuring the resistance value and comparing it against threshold values, the system can distinguish between accessories with microphones and those without, thereby accurately controlling microphone activation while maintaining adaptability to different accessory types
Solution Approach 2:
The patent replaces the mechanical/connection-based detection method with an electrical measurement method. Instead of relying on the physical presence of the fourth terminal to determine microphone capability, the system uses electrical resistance measurement to accurately identify whether the connected accessory actually contains a microphone, thus improving reliability while preserving adaptability
2Productivity
If the electronic device uses a simple connection detection method, then the device can quickly identify connected accessories, but the device cannot accurately distinguish between accessories with and without microphones
Solution Approach 1:
The patent introduces electrical resistance value as a new detection parameter that can be quickly measured through software control. By measuring the resistance between the fourth terminal and other terminals, and comparing against pre-set threshold values, the system achieves both quick identification (maintaining productivity) and accurate distinction between accessory types (improving measurement precision)
Solution Approach 2:
The patent implements a feedback mechanism where the measured resistance value is compared against threshold values to determine accessory type. This feedback loop allows the system to quickly identify accessories while accurately distinguishing between those with and without microphones, balancing productivity and measurement precision
Data Source
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AI summary
Disclosed are an electronic device and a method for controlling the same, where the electronic device that includes an earphone connector including first and second contacts associated with a sound output through an audio plug, a third contact connected to a ground terminal, and a fourth contact associated with a sound input, and a microphone. The method includes applying a bias voltage to the fourth contact, measuring a voltage between the third and fourth contacts, measuring an impedance between at least one of the first or second contact and the third contact, activating the microphone when the measured voltage is greater than or equal to a first threshold value and the measured impedance is less than or equal to a second threshold value, and deactivating the microphone when the measured voltage is greater than or equal to the first threshold value and the measured impedance exceeds the second threshold value.