Source Directivity Reverberator Adjustment for Accurate Spatial Audio
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Solution Overview
Problem
Existing spatial audio reproduction systems fail to accurately model and reproduce the effect of sound source directivity on reverberation, leading to suboptimal reverberation quality, especially in augmented and virtual reality environments.
Innovation Solution
An apparatus and method that utilize directivity data to determine frequency-dependent gain data, which is then used to adjust reverberators based on room parameters, ensuring accurate reproduction of late reverberation by spatially averaging gains and applying them to audio signals, thereby incorporating source directivity into the rendering process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reverberation is reproduced using multiple loudspeakers with uncorrelated signals, then diffuse reverberation perception is achieved, but the reverberation is perceived to be similar in all directions without accounting for source directivity
Solution Approach 1:
The patent applies local quality by assigning different gain values to different spatial directions based on the sound source's directivity pattern. Instead of uniform reverberation across all directions, the system modifies the reverberation signal characteristics locally in each direction to match the directional emission properties of the sound source, thereby achieving directionally accurate reverberation reproduction
Solution Approach 2:
The system dynamically adjusts the reverberation characteristics based on the sound source's directivity pattern. By calculating direction-dependent gain values and applying them in real-time during audio rendering, the reverberation adapts to the changing directional properties of the sound source, enabling accurate spatial reproduction that responds to source positioning and orientation
2Device complexity
If spatially averaged gain data is used for reverberation, then computational complexity is reduced, but directional accuracy of reverberation is compromised
Solution Approach 1:
The patent implements partial action by computing spatially averaged gain data only for the late reverberation portion rather than the entire impulse response. The early reflections maintain full directional accuracy while the late reverberation uses the computationally efficient spatial averaging approach, thereby reducing overall computational complexity while preserving essential directional characteristics where most needed
Data Source
AI summary
An apparatus configured to: obtain directivity data having an identifier, wherein the directivity data comprises data for at least two separate directions; obtain at least one room parameter; determine information associated with the directivity data; determine coded gain data based on the determined information; and generate a bitstream defining a rendering, the bitstream comprising the coded gain data and the at least one room parameter such that at least one audio signal associated with the identifier is configured to be rendered based on the at least one room parameter and decoded values of the coded gain data.