Microphone Array Beamforming Stabilization via Orientation Sensor Feedback
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Solution Overview
Problem
Existing audio beamforming technologies in mobile devices struggle to maintain directional audio capture when the device is moved, as they rely on precise knowledge of the sound source location and lack adaptive mechanisms to adjust beamforming accordingly.
Innovation Solution
A microphone array with a signal processor and an orientation sensor, such as a compass, accelerometer, or inertial sensor, that adjusts the beamforming direction in response to device movement, ensuring continuous focus on the intended sound source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If beamforming is used to capture directional audio, then ambient noise rejection is improved, but the system cannot maintain directional accuracy when the device moves
Solution Approach 1:
The system uses orientation sensors (accelerometers, gyroscopes, magnetometers) to continuously monitor device orientation and feeds this information back to the beamforming processor. The processor dynamically adjusts beamforming parameters based on the feedback to maintain accurate directional tracking despite device movement.
Solution Approach 2:
The beamforming system transitions from a static configuration to a dynamic one by continuously adapting beam directions based on real-time orientation sensor data. The system dynamically recalculates time delays and phase shifts for each microphone element to maintain the desired beam pattern as the device moves.
2Stability of the object's composition
If the beamforming aim is fixed, then the directional capture is stable, but it cannot track a moving sound source
Solution Approach 1:
The system implements dynamic beam steering by continuously updating beam directions based on sound source localization algorithms. When a sound source is detected or tracked, the system dynamically adjusts the phase and amplitude weights of individual microphones to steer the beam toward the moving source while maintaining beamforming stability through controlled adaptation.
Solution Approach 2:
The system automatically tracks moving sound sources without requiring manual intervention. The beamforming processor continuously monitors audio inputs, identifies sound source positions, and self-adjusts beam directions to follow moving sources, providing adaptive tracking capability.
3Reliability
If orientation sensors are added to track device movement, then directional accuracy during movement is improved, but device complexity increases
Solution Approach 1:
The system uses a single integrated sensor package that provides multiple functions: accelerometers detect linear acceleration and orientation changes, gyroscopes measure rotational movement, and magnetometers provide heading information. This multi-functional sensor suite consolidates multiple measurement capabilities into one compact unit, reducing overall system complexity while maintaining directional accuracy.
Solution Approach 2:
The system replaces complex mechanical orientation tracking mechanisms with electronic sensor-based detection and digital signal processing. Instead of physically tracking device movement through mechanical means, the system uses electronic sensors to detect orientation changes and computationally adjusts beamforming parameters, simplifying the physical system while achieving the same goal.
Data Source
AI summary
A device includes a microphone array fixed to the device. A signal processor produces an audio output using audio beamforming with input from the microphone array. The signal processor aims the beamforming in a selected direction. An orientation sensor—such as a compass, an accelerometer, or an inertial sensor—is coupled to the signal processor. The orientation sensor detects a change in the orientation of the microphone array and provides an orientation signal to the signal processor for adjusting the aim of the beamforming to maintain the selected direction. The device may include a camera that captures an image. An image processor may identify an audio source in the image and provide a signal adjusting the selected direction to follow the audio source. The image processor may receive the orientation signal and adjust the image for changes in the orientation of the camera before tracking movement of the audio source.