Audio Codec Circuit Voltage Compensation for TWS Earbuds
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Solution Overview
Problem
True wireless stereo earphones face challenges in achieving sound playing synchronization and consistent volume between the left and right ear units due to inconsistencies in audio processing and output between the two units.
Innovation Solution
An audio codec circuit is designed with components like voltage detecting, output processing, digital-to-analog conversion, and audio amplifying circuits to detect input voltage and compensate for variations, ensuring consistent audio processing and output between the left and right ear units, using compensation values to maintain synchronized volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If true wireless stereo earphones are designed without wire connection between left and right ear units, then wireless signal transmission can be performed with sound playing host, but audio processing consistency between left and right ear units deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where each ear unit detects its own input voltage, determines compensation values based on detected voltage and circuit parameters, and applies these compensation values to adjust audio processing. This closed-loop feedback system ensures that both ear units maintain consistent audio output despite voltage variations, resolving the contradiction between wireless operation and audio processing consistency.
Solution Approach 2:
The patent dynamically changes processing parameters (compensation values) based on detected input voltage levels. Each ear unit adjusts its audio processing parameters according to its specific voltage conditions and circuit characteristics, allowing consistent audio output across both ear units while maintaining wireless operation. This parameter adaptation resolves the consistency issue without requiring physical connections.
2Adaptability or versatility
If input voltage varies between left and right ear units, then wireless operation flexibility is maintained, but output audio volume consistency deteriorates
Solution Approach 1:
The patent changes processing parameters (compensation values) based on detected input voltage levels. Each ear unit adjusts its audio processing parameters dynamically according to its specific voltage conditions, allowing the system to adapt to voltage variations while maintaining consistent output volume between left and right ear units.
Solution Approach 2:
The patent applies local compensation to each ear unit based on its specific voltage conditions and circuit parameters. Rather than requiring uniform processing across both ear units, the system tailors the processing parameters to each unit's local characteristics, ensuring that despite different input voltages, the output volume consistency is maintained.
3Adaptability or versatility
If audio processing is performed independently in each ear unit, then wireless stereo operation is enabled, but audio processing consistency between ear units deteriorates
Solution Approach 1:
The patent enables independent operation by allowing each ear unit to determine and apply its own compensation values based on its detected voltage and circuit parameters. This independent parameter adjustment ensures that each ear unit processes audio consistently according to its specific conditions, resolving the contradiction between independent wireless operation and audio processing consistency.
Solution Approach 2:
Each ear unit performs self-compensation by detecting its own voltage, determining appropriate compensation values, and applying these values to its audio processing. This self-service approach allows independent operation while maintaining consistency, as each unit autonomously adjusts its processing to match expected performance standards.
Data Source
AI summary
An audio codec circuit includes a voltage detecting circuit, an output processing circuit, a digital-to-analog conversion circuit, and an audio amplifying circuit. The voltage detecting circuit is configured to detect an input voltage of an input power. The output processing circuit obtains a first output compensation value according to the input voltage, an output circuit parameter, and a first output spec. The output processing circuit processes a digital audio and compensates the processed audio by the first output compensation value. The digital-to-analog conversion circuit is configured to perform digital-to-analog conversion on the compensated audio to obtain an analog audio. The audio amplifying circuit is configured to amplify the analog audio and output the amplified audio.