Switching Amplifier Output Synchronization for Lower EMI and Loss
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Solution Overview
Problem
Integrated switching amplifiers fail to leverage increased integration for improved audio performance, efficiency, and reduced Electromagnetic Interference (EMI) compared to their non-integrated counterparts.
Innovation Solution
Synchronizing static or dynamic dissimilar output sampling rates of multiple outputs of an integrated switching amplifier by aligning pulse leading edges, which allows for reduced sampling rates that satisfy the Nyquist criterion while minimizing switching losses and EMI emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If integrated switching amplifiers use uniform high sampling rates for all outputs, then audio performance is maintained, but switching losses and EMI increase
Solution Approach 1:
The patent implements dynamic sampling rate adjustment where each output channel operates at its own optimized sampling rate rather than a uniform rate. The system dynamically adapts the sampling rate of each channel based on its specific frequency content requirements, allowing low-frequency channels to use lower rates (reducing switching losses) while high-frequency channels maintain higher rates (preserving audio performance).
Solution Approach 2:
The patent applies different sampling rates to different output channels based on their specific requirements. Each channel is treated locally with its own optimized sampling rate rather than applying a global uniform rate, allowing each channel to operate at the minimum necessary rate for its frequency content, thereby reducing overall switching losses while maintaining required audio quality.
2Measurement precision
If integrated switching amplifiers use uniform high sampling rates for all outputs, then audio performance is maintained, but EMI emissions increase
Solution Approach 1:
The system dynamically adjusts each channel's sampling rate to match its frequency content requirements. By lowering the sampling rate of channels with limited bandwidth requirements, the switching frequency and its harmonics are reduced, directly decreasing EMI emissions from those channels while maintaining adequate audio performance.
Solution Approach 2:
Each output channel is assigned a locally optimized sampling rate based on its specific frequency content. This localized optimization prevents unnecessary high-frequency switching in channels that don't require it, thereby reducing overall EMI emissions while preserving audio quality where needed.
3Loss of energy
If integrated switching amplifiers use dissimilar sampling rates for multiple outputs, then energy efficiency improves, but synchronization complexity increases
Solution Approach 1:
The patent segments the multi-channel audio system into independent sampling rate control domains. Each output channel can be independently configured with its own sampling rate, allowing energy optimization per channel. The segmentation approach manages complexity by treating each channel separately rather than requiring complex inter-channel coordination.
Solution Approach 2:
Each output channel autonomously operates at its optimized sampling rate based on its own frequency content requirements, without requiring continuous coordination with other channels. This self-service approach simplifies synchronization by allowing independent operation while maintaining overall system coherence through the shared audio processing architecture.
Data Source
AI summary
A method of synchronizing static or dynamic dissimilar output sampling rates of multiple outputs of an integrated switching amplifier uses the step of synchronizing dissimilar static or dynamic sampling rates of multiple outputs to yield improved sonic quality, higher efficiency, lower EMI or other benefits. According to the preferred embodiment, the synchronizing is carried out with respect to pulse leading edges.