Audio Power Output Amplitude Control for Clipping Prevention
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Solution Overview
Problem
Audio output stages in energy-limited devices often experience distortion due to insufficient voltage, as existing solutions only consider the present power supply state and not the future energy demand, leading to inaccuracies in reproducing audio power output signals.
Innovation Solution
A power output circuit that generates a power output signal by determining the energy requirement from input program samples and adjusting the amplitude based on available energy from the power supply, preventing clipping by calculating the available energy from measurements of power supply voltage, current, and capacitance, and comparing it to the demanded energy for accurate waveform reproduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If power supply voltage is boosted momentarly to deliver peak output waveform (class G/H amplifiers), then the amplitude of output waveform can be maintained at full linear-scaled level, but the energy consumption increases and future energy demand is not considered leading to inaccuracies
Solution Approach 1:
The system performs preliminary analysis of buffered audio samples to predict future energy requirements before delivering the audio output. By examining the buffered samples in advance, the system can anticipate peak demands and prepare appropriate power supply voltage levels, avoiding the need for momentary boosts and reducing overall energy consumption while maintaining waveform accuracy.
Solution Approach 2:
The system continuously monitors the power supply voltage and compares it against predicted energy requirements from buffered samples. This feedback mechanism allows dynamic adjustment of the power supply voltage to match actual future demands, preventing both energy waste from excessive boosting and waveform distortion from insufficient voltage.
2Manufacturing precision
If power supply voltage is boosted momentarly, then peaks of output waveform can be reproduced accurately, but distortion occurs when insufficient voltage is available
Solution Approach 1:
The system buffers and analyzes audio samples in advance to predict future voltage requirements. This preliminary action allows the power supply voltage to be adjusted proactively before peaks occur, ensuring accurate waveform reproduction without clipping while avoiding the distortion associated with reactive voltage boosting.
3Use of energy by moving object
If amplitude of output waveform is reduced, then energy consumption decreases, but the output quality deteriorates
Solution Approach 1:
The system dynamically adjusts the power supply voltage in real-time based on predicted energy requirements from buffered samples. This dynamic adjustment allows the system to maintain full amplitude output quality when energy is available while reducing power consumption during low-demand periods, avoiding the need for permanent amplitude reduction.
Data Source
AI summary
A power output circuit supplies an audio power output signal that is adjusted to prevent clipping when needed based on an estimate of available energy from the power supply supplying the power output circuit. The power output circuit may be an audio power output circuit that generates an audio power output signal from samples of an audio program that are stored in a buffer. A processing block determines an energy requirement for producing the audio power output signal from the audio program and adjusts an amplitude of the audio power output signal in conformity with the determined energy requirement and an available energy determined for the power supply so that the audio power output signal is reproduced without clipping of the audio power output signal.