Audio Codec Pop Noise Elimination via Control Chip Voltage Compensation
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Solution Overview
Problem
Mobile terminals experience pop sounds due to direct current bias voltages in audio codec sound channel output pins during enabling and disabling processes, affecting user experience.
Innovation Solution
A control chip outputs a compensating voltage signal to the audio codec to maintain a 0V direct current bias voltage on sound channel output pins during enabling and disabling, using an electronic switch to connect and disconnect the pins from the ground terminal as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the audio codec is enabled or disabled during operation, then the audio processing function is activated or deactivated, but direct current bias voltage appears on the sound channel output pins causing pop sounds
Solution Approach 1:
The control chip detects the enabling or disabling state of the audio codec in advance and outputs a compensating voltage signal before the direct current bias voltage can affect the earphones. This preliminary action prevents the pop sound from occurring in the first place by counteracting the voltage change before it reaches the output pins.
Solution Approach 2:
A control chip is introduced as an intermediary component between the audio codec and the earphones. This control chip monitors the audio codec's state and generates compensating voltage signals to offset direct current bias voltage, thereby preventing pop sounds without affecting the normal audio transmission function.
2Reliability
If the audio codec operates normally during enabling and disabling, then audio processing is maintained, but direct current component affects earphone output quality
Solution Approach 1:
The control chip continuously monitors the enabling and disabling state of the audio codec and provides real-time feedback control by outputting compensating voltage signals. This feedback mechanism ensures that direct current bias voltage is counteracted dynamically, maintaining both reliable audio processing and high output quality without distortion.
Data Source
AI summary
A mobile terminal and a control method are provided. The mobile terminal includes an audio codec and a control chip, where the audio codec has sound channel output pins, the control chip and the audio codec are electrically connected to each other, and the control chip is configured to output a voltage compensating signal to the audio codec in processes of enabling and disabling the audio codec, so that a direct current bias voltage of the sound channel output pins is 0V in the processes of enabling and disabling the audio codec.