Beamforming Wind Noise Reduction Microphone Placement
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Solution Overview
Problem
Image capture devices face challenges in optimizing microphone placements for effective wind noise reduction, which limits the ability to create high-quality stereo audio signals due to non-optimal microphone placements and environmental conditions.
Innovation Solution
The implementation of beamforming techniques with optimized microphone placements, including a front-facing microphone co-located with an optical component and at least one non-front-facing microphone, generates forward and non-rear facing beams to enhance wind noise reduction and audio signal processing, applying tuned beamforming parameters to account for body shadowing and delay effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If microphones are placed at non-optimal locations for wind performance, then the device structure is simplified, but wind noise increases and audio quality deteriorates
Solution Approach 1:
The patent segments the audio capture function by using multiple microphones positioned at different locations (front-facing and non-front-facing) rather than relying on a single microphone. This segmentation allows the system to process and combine signals from different spatial positions, effectively reducing wind noise while maintaining structural simplicity.
Solution Approach 2:
The patent transitions from traditional single-point microphone placement to multi-dimensional spatial distribution of microphones. By positioning microphones both at the front and non-front locations, the system creates a three-dimensional audio capture geometry that enables advanced beamforming algorithms to differentiate between wind noise and actual audio sources based on spatial characteristics.
2Measurement precision
If traditional beamforming techniques are used with non-optimal microphone placements, then device manufacturing is simplified, but audio signal quality and stereo reproduction deteriorate
Solution Approach 1:
The patent applies tuned beamforming parameters specifically designed to compensate for the non-optimal microphone placements. By adjusting delay values, gain factors, and beamforming weights, the system optimizes audio signal quality and stereo reproduction despite the simplified manufacturing process that places microphones in easily accessible but non-ideal locations.
3Adaptability or versatility
If microphones are co-located with optical components, then device integration is improved, but wind noise from optical component movement increases
Solution Approach 1:
The patent uses beamforming algorithms as an intermediary processing layer that separates the beneficial integration of microphones with optical components from the harmful wind noise they generate. The signal processing system identifies and suppresses wind-related artifacts while preserving the integrated design benefits, allowing microphones to be co-located with optical components without directly transmitting wind noise to the output.
4Measurement precision
If multiple microphones are used for beamforming, then audio quality improves, but device complexity and processing requirements increase
Solution Approach 1:
The patent implements dynamic beamforming that adapts to changing acoustic environments in real-time. The system continuously adjusts beamforming parameters based on incoming signals from multiple microphones, enabling high-quality audio recording while managing processing complexity through adaptive algorithms that optimize performance based on current conditions rather than requiring fixed complex processing for all scenarios.
Data Source
AI summary
An image capture device with beamforming for wind noise optimized microphone placements is described. The image capture device includes a front facing microphone configured to capture an audio signal. The front facing microphone co-located with at least one optical component. The image capture device further includes at least one non-front facing microphone configured to capture an audio signal. The image capture device further includes a processor configured to generate a forward-facing beam using the audio signal captured by the front facing microphone and the audio signal captured by the at least one non-front facing microphone, generate an omni beam using the audio signal captured by the at least one non-front facing microphone, and output an audio signal based on the forward facing beam and the omni beam.