Dynamic Wind Noise Compression Tuning for Image Capture Audio
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Solution Overview
Problem
Image capture devices struggle with maintaining audio quality in the presence of wind noise, as existing audio compressors are preset and fail to adapt effectively to varying environmental conditions, leading to inconsistent audio levels and reduced dynamic range.
Innovation Solution
Implementing a dynamic wind noise compression tuning system that uses at least two microphones to measure coherence, adjusts compression thresholds and parameters based on wind noise detection, and applies adjusted compression parameters to maintain audio at a nominal level, even in windy conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If preset compression parameters are used, then the audio levels are maintained at nominal levels under normal conditions, but the audio quality deteriorates in windy conditions due to inability to adapt
Solution Approach 1:
The patent implements dynamic compression parameters that automatically adjust based on detected wind noise levels. The system transitions from static preset parameters to dynamic parameters that adapt in real-time to environmental conditions, resolving the contradiction between adaptability and reliability by making the compression behavior responsive to changing wind conditions while maintaining consistent audio quality
Solution Approach 2:
The patent employs a feedback mechanism where the audio signal is continuously monitored for wind noise characteristics, and compression parameters are adjusted based on this feedback. The system detects wind noise patterns and modifies compression threshold and ratio accordingly, creating a closed-loop control system that maintains audio quality across varying environmental conditions
2Object-affected harmful factors
If compression threshold is reduced to initiate compression earlier, then wind noise is reduced more effectively, but the dynamic range is compressed excessively in calm conditions
Solution Approach 1:
The patent dynamically changes compression parameters (threshold and ratio) based on detected wind noise levels. During windy conditions, the threshold is reduced and ratio increased to suppress wind noise effectively. During calm conditions, parameters return to normal values to preserve dynamic range. This conditional parameter adjustment resolves the contradiction by applying aggressive compression only when necessary
Solution Approach 2:
The patent applies partial compression during calm conditions and excessive (aggressive) compression during windy conditions. By adjusting the degree of compression based on environmental needs, the system avoids excessive compression during calm periods while ensuring sufficient wind noise reduction during windy periods, thus balancing dynamic range preservation with wind noise suppression
3Reliability
If gain parameter is increased to maintain nominal audio levels, then audio quality is maintained in windy conditions, but the overall audio signal becomes amplified in calm conditions
Solution Approach 1:
The patent dynamically adjusts the gain parameter based on detected wind noise conditions. During windy conditions, gain is increased to maintain nominal audio levels despite compression. During calm conditions, gain returns to default values to avoid unnecessary amplification. This conditional parameter adjustment resolves the contradiction between maintaining consistent audio levels and avoiding excessive signal amplification
Data Source
AI summary
An image capture device with dynamic wind noise compression tuning techniques is described. A technique includes detecting of the presence of wind noise by measuring coherence between at least two microphones. For a compressor, adjusting a default compression threshold and default compression parameters based on the coherence measurements. For each microphone, applying by the compressor the adjusted compression parameters when an audio signal is above the adjusted compression threshold and applying the default compression parameters when the audio signal is below the adjusted compression threshold.