Audio Jack Switch Control for Pop-Noise-Free Side-Tone Paths
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Solution Overview
Problem
Existing audio devices with side-tone functionality experience pop noise when a microphone or wired audio plug is plugged in or out, which existing firmware solutions fail to effectively mitigate.
Innovation Solution
An audio device equipped with a first switch and controller that detects the plug position of the audio jack, turning on or off audio switches to manage audio signal transmission based on the jack's status, thereby preventing pop noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If firmware programs are used to delay reception speed or gradually increase playback sound, then pop noise impact is reduced, but the solution fails when audio plug is slowly plugged in or out
Solution Approach 1:
The patent applies preliminary action by detecting the audio jack position before audio signal transmission begins. The detection switch checks whether the jack is properly inserted into the positioning point, and only after confirming proper insertion does the system enable audio signal reception and playback. This preliminary position verification ensures that even if the plug is slowly inserted, the system waits for proper positioning before activating audio functions, thereby eliminating pop noise effectively under all plugging conditions.
2Productivity
If audio switch is always on, then audio signal transmission is continuous, but pop noise occurs during plugging and unplugging operations
Solution Approach 1:
The patent implements feedback through a detection switch that continuously monitors the audio jack position. The switch detects whether the jack is inserted into the positioning point and provides real-time feedback to the control system. Based on this feedback, the audio switch is dynamically controlled - turned on when the jack is properly inserted and turned off when removed. This feedback mechanism ensures audio signal transmission continuity during normal operation while automatically preventing pop noise during plugging and unplugging operations.
Data Source
AI summary
An audio device and a control method thereof are provided. The audio device includes a first switch, a controller, and multiple audio switches. The first switch is turned on or cut off according to whether an audio jack is on a setting position. A first end of the first switch receives a bias voltage. The controller is coupled to the first switch, and generates control signals according to a turned-on or cut-off status of the first switch. The audio switches are respectively coupled between transmission paths of multiple audio signals. The audio switches are turned on or cut off according to the control signals or a voltage on a second end of the first switch.