Audio Device Jack Detection Circuit Noise Prevention
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Solution Overview
Problem
Multimedia devices face inconvenience due to unintended noise generation when a personal playback unit's jack is inserted or removed from a jack slot, as existing technologies lack effective methods to prevent these noises.
Innovation Solution
An audio device with a jack detection circuit that includes a comparator, logical gate circuit, and transistors to detect jack insertion and apply appropriate voltages to prevent noise, using channel and ground detection electrodes to manage the microphone detection electrode's voltage state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a jack detection circuit is added to detect jack insertion and removal, then noise generation can be prevented, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by detecting jack insertion/removal events before noise can be generated. The detection circuit monitors the electrical connection state in advance and triggers noise prevention measures proactively, preventing the harmful effect rather than reacting to it after occurrence.
Solution Approach 2:
The patent uses an intermediary detection circuit that acts as a mediator between the jack connection state and the audio output system. This intermediary component detects the connection state and controls the audio processing, preventing direct noise transmission from the jack interface to the output.
2Object-affected harmful factors
If voltage control is applied to the microphone detection electrode to prevent noise, then noise is reduced, but energy consumption increases
Solution Approach 1:
The patent implements periodic action by applying voltage control to the microphone detection electrode only during jack insertion/removal events rather than continuously. The detection circuit activates voltage control temporarily when needed, reducing energy consumption compared to continuous voltage application while still preventing noise during critical moments.
Data Source
AI summary
Disclosed is an audio device including an audio codec circuit connected to a first channel electrode, a second channel electrode, and a microphone detection electrode, and a jack detection circuit connected to a first channel detection electrode, a ground detection electrode, and the microphone detection electrode, and, in response to voltages of the first channel detection electrode and the ground detection electrode corresponding to a ground voltage, the jack detection circuit detects insertion of a jack, applies the ground voltage to the ground detection electrode, and applies a bias voltage to the microphone detection electrode.