Early Reflection Pattern for VR Auralization
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Solution Overview
Problem
Current early reflection rendering in virtual and augmented reality applications requires complex geometric calculations, leading to high computational costs and the need for precise sound engineering expertise, while also failing to efficiently handle dynamic environments and outdoor settings.
Innovation Solution
The use of simple early reflection patterns defined by basic physical parameters such as RT60, predelay time, room volume, and frequency dependency, which are adaptive and do not depend on exact geometry, allowing for efficient rendering and transmission, and are invariant to listener head orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If exact geometric calculations are used to determine early reflections from source to listener, then acoustic accuracy is improved, but computational complexity increases
Solution Approach 1:
The patent transforms the complex geometric calculation problem into a parameter-based solution by using room acoustic parameters (RT60, predelay time, room volume) to define early reflection patterns. Instead of calculating each reflection path geometrically, the system changes the approach to parameterize the reflection pattern, significantly reducing computational complexity while maintaining perceptual accuracy.
Solution Approach 2:
The patent creates simplified copies of early reflection patterns that are invariant to listener head orientation. Rather than recalculating reflections for every head position, the system uses pre-defined patterns that can be directly applied, reducing computational load while preserving the essential acoustic characteristics needed for realistic spatial audio.
2Measurement precision
If detailed sound engineering parameters are used to define early reflection patterns, then perceptual quality is improved, but ease of operation deteriorates
Solution Approach 1:
The patent enables the system to automatically determine early reflection patterns using basic physical parameters (RT60, predelay time, room volume) without requiring sound engineering expertise. The system serves itself by computing appropriate reflection patterns from readily available room parameters, eliminating the need for manual configuration by skilled audio engineers.
Solution Approach 2:
The patent simplifies the parameter set needed to define early reflection patterns from complex sound engineering parameters to basic physical parameters. This parameter transformation makes the system accessible to users without specialized audio knowledge, as these physical parameters are more intuitive and easier to obtain.
3Measurement precision
If geometry-based early reflection calculation is used, then accuracy for indoor environments is improved, but adaptability to outdoor environments deteriorates
Solution Approach 1:
The patent creates a universal early reflection pattern definition that works across different environments (indoor and outdoor). By using environment-agnostic parameters like RT60, predelay time, and room volume, the same mathematical framework can be applied to diverse acoustic settings, making the system versatile without sacrificing accuracy in any specific environment.
4Productivity
If constant early reflection patterns are used, then computational efficiency is improved, but perceptual accuracy for dynamic environments deteriorates
Solution Approach 1:
The patent introduces dynamic adaptation of early reflection patterns based on listener position and orientation. While the basic pattern structure remains constant for efficiency, the system dynamically adjusts the pattern application based on current acoustic parameters and listener state, maintaining both computational efficiency and perceptual accuracy in dynamic VR/AR environments.
Data Source
AI summary
The present application concerns early reflection processing concepts for auralization. Embodiments relate to apparatuses and methods for sound rendering considering early reflections and to apparatuses and methods for determining an early reflection pattern.