Headset Jack External Microphone Detection Circuit
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Solution Overview
Problem
Consumer electronic devices require additional circuitry to detect external microphones, occupying valuable PCB space and increasing costs in a market that demands smaller and cheaper devices.
Innovation Solution
An electronic device is configured to automatically detect an external microphone using a headset jack, external microphone contact, and an audio processor that selects and processes audio signals from the microphone, eliminating the need for additional circuitry by utilizing existing components like a codec and processor to determine the presence of an external microphone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional circuitry is added to detect external microphones, then detection capability is improved, but PCB space and device cost increase
Solution Approach 1:
The patent applies multi-functionality by enabling the existing audio processor and headset detector to perform both their original functions and the additional function of detecting external microphone presence. The audio processor continues to handle audio signals while also analyzing them to detect microphone connections, eliminating the need for dedicated detection circuitry.
Solution Approach 2:
The patent merges the detection function with the existing audio processing function. By combining the microphone detection task with the audio signal processing task that already exists in the device, the system achieves detection capability without adding separate dedicated circuitry, thus saving PCB space.
2Reliability
If additional circuitry is added to detect external microphones, then detection capability is improved, but device cost increases
Solution Approach 1:
The patent applies multi-functionality by enabling the existing audio processor and headset detector to perform both their original functions and the additional function of detecting external microphone presence. The audio processor continues to handle audio signals while also analyzing them to detect microphone connections, eliminating the need for dedicated detection circuitry.
Solution Approach 2:
The patent merges the detection function with the existing audio processing function. By combining the microphone detection task with the audio signal processing task that already exists in the device, the system achieves detection capability without adding separate dedicated circuitry, thus saving PCB space.
3Area of stationary object
If existing components are used for detection, then PCB space is reduced, but detection accuracy may be compromised
Solution Approach 1:
The patent applies self-service by having the audio processor use its own existing audio signal processing capabilities to perform the detection function. The audio processor analyzes audio signals from the headset microphone to detect the presence of an external microphone, utilizing its own resources rather than requiring separate dedicated detection hardware.
Solution Approach 2:
The patent uses the audio signal as an intermediary to enable detection. Instead of directly detecting microphone presence through separate circuitry, the system uses audio signals from the headset microphone as an intermediary medium to infer the presence of an external microphone, allowing detection through existing audio processing capabilities.
Data Source
AI summary
In a device including a headset jack having an external microphone contact, and an external microphone signal path connected to the external microphone contact, a method including detecting whether a headset plug is plugged into the headset jack and, if the headset plug is detected, selecting an audio signal received from the external microphone signal path, recording the selected audio signal, to produce a recorded audio signal, and determining if an external microphone is connected to the external microphone contact based on the recorded audio signal.