Spatial Audio Stabilization via Motion Sensor Feedback
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Solution Overview
Problem
Portable devices capturing audio and video signals are prone to motion-induced errors, leading to unstable audio source positioning and oscillation during recording, especially when the device is in motion, affecting the accuracy of spatial audio representation.
Innovation Solution
A method and apparatus that determine spatial audio signals and stabilize them by calculating apparatus motion parameters from video image motion values, using sensors like accelerometers and gyroscopes, to adjust audio source locations and filter out lower frequency motions, thereby stabilizing the audio signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If spatial audio capture technology is used to record audio signals, then the accuracy of audio source positioning is improved, but the stability of audio source positioning deteriorates when the device is in motion
Solution Approach 1:
The system uses motion sensors (accelerometers and gyroscopes) to detect device motion and feeds this information back to the audio processing system. The audio stabilizer continuously adjusts audio source positioning based on real-time motion data, creating a feedback loop that compensates for motion-induced positioning errors and maintains stable audio source locations during device movement.
Solution Approach 2:
The system changes the parameter of audio source positioning by applying motion compensation transformations. When motion sensors detect device movement, the audio stabilizer modifies the spatial coordinates of audio sources using mathematical transformations that reverse the motion effect, thereby maintaining accurate and stable positioning despite physical device movement.
2Stability of the object's composition
If motion sensors are added to stabilize audio signals, then audio source positioning stability is improved, but device complexity increases
Solution Approach 1:
The motion sensors (accelerometers and gyroscopes) serve multiple functions: they stabilize audio source positioning, enable video stabilization, and provide orientation information for spatial audio rendering. By making the sensor system multi-functional, the patent reduces the need for separate dedicated components for each function, thereby limiting the increase in device complexity while achieving stable audio positioning.
Solution Approach 2:
The audio stabilizer merges the audio processing function with the motion sensing and video stabilization functions into a unified system. The same motion data from accelerometers and gyroscopes is used by both audio and video processing modules, combining multiple functions into a single integrated system that reduces overall device complexity.
3Speed
If audio signal processing is performed in real-time, then the responsiveness of audio stabilization is improved, but computational requirements and energy consumption increase
Solution Approach 1:
The audio stabilizer applies partial processing by selectively applying motion compensation only when motion is detected above a certain threshold. Instead of continuously processing all audio signals with full computational intensity, the system uses lighter processing during low-motion periods and intensifies processing only when necessary, reducing overall energy consumption while maintaining real-time responsiveness during critical moments.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively stabilizes spatial audio signals by compensating for translational and rotational motions, improving the accuracy of audio source positioning and reducing oscillations, resulting in a more stable and accurate audio representation.
Implementation Method 1
determining an apparatus motion parameter from a positional sensor. The positional sensor may comprise at least one of: accelerometer, gyroscope, electronic compass, a satellite positional estimator
Implementation Method 2
determining an apparatus motion parameter from a positional sensor. The positional sensor may comprise at least one of: accelerometer, gyroscope, electronic compass, a satellite positional estimator
Data Source
AI summary
A method comprising determining a spatial audio signal; determining an apparatus motion parameter; and stabilizing the spatial audio signal dependent on the apparatus motion parameters.