Headphone Control Circuit Noise Suppression via Extraction
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Solution Overview
Problem
Existing display apparatuses face issues with uncontrollable noise and pops when turned off due to aging capacitors in headphone control circuits, leading to reduced user experience and delayed mute response times.
Innovation Solution
A simplified headphone control circuit that directly controls the switch circuit using a main chip to mute the headphone, eliminating the need for a power amplifier chip and capacitors, ensuring the display apparatus does not output noise when turned off and improving response time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a power amplifier chip and capacitors are used in the headphone control circuit, then the headphone can be controlled to mute, but uncontrollable noise and pops occur when the display apparatus is turned off due to capacitor aging
Solution Approach 1:
The patent removes the power amplifier chip and capacitors from the headphone control circuit, extracting the problematic components that cause noise and pops during shutdown. The control circuit directly controls the headphone without these intermediate components, eliminating the source of the harmful noise while maintaining mute functionality.
2Power
If a power amplifier chip is used in the headphone control circuit, then audio signal amplification is achieved, but the response time for muting the headphone is delayed
Solution Approach 1:
The patent extracts the power amplifier chip from the circuit, eliminating the delay caused by its operation. The control circuit now directly controls the headphone switching without the intermediate amplification stage, significantly reducing the mute response time while maintaining sufficient audio output power for headphone operation.
3Use of energy by moving object
If capacitors are included in the headphone control circuit, then power management is improved, but the circuit complexity increases and reliability decreases due to capacitor aging
Solution Approach 1:
The patent removes capacitors from the headphone control circuit, simplifying the overall circuit structure and reducing component quantity. The control circuit directly manages power delivery to the headphone without intermediate energy storage components, reducing circuit complexity while maintaining adequate power management functionality.
Data Source
AI summary
Provided are a display apparatus and a headphone control circuit thereof including a main chip, a headphone port and a switch circuit including a control circuit, a left channel switch and a right channel switch, the control circuit, the left channel switch and the right channel switch connecting to the main chip, the control circuit connecting to the left channel switch and the right channel switch, the left channel switch and the right channel switch connecting to the headphone port; the control circuit configured to receive a control signal output from the main chip and, output according to the control signal a first signal to the left channel switch and a second signal to the right channel switch respectively, the first signal is used to control on or off of the left channel switch, and the second signal is used to control on or off of the right channel switch.