Spherical-Harmonic Audio Rendering for 3DOF and 6DOF VR
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Solution Overview
Problem
Existing VR, AR, and MR technologies struggle to provide immersive audio experiences that account for six degrees of freedom, particularly in devices that support fewer than six degrees of freedom, leading to limited auditory immersion.
Innovation Solution
The use of spherical harmonic coefficients (SHC) and higher-order ambisonic (HOA) representations to encode and render audio data, enabling rendering of audio that accounts for six degrees of freedom on devices that support fewer degrees of freedom, by generating metadata that adapts audio rendering based on user movement and location.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If audio data is encoded with six degrees of freedom for immersive audio experience, then auditory immersion is improved, but device complexity increases
Solution Approach 1:
The audio data is divided into multiple audio adaptation sets, each associated with different regions and encoded at different bit rates. This segmentation allows the system to provide high-quality 6DOF audio when needed while maintaining compatibility with devices that have fewer degrees of freedom, thus resolving the contradiction between adaptability and complexity
Solution Approach 2:
The system is designed to support multiple degrees of freedom (3DOF, 6DOF) within a single unified framework. The audio encoder can generate adaptation sets that work on devices with varying capabilities, making the system universal and reducing the need for separate complex systems for different device types
2Measurement precision
If audio data is encoded at high bit rates for quality, then audio quality is improved, but data size increases
Solution Approach 1:
The audio stream is segmented into multiple adaptation sets with different bit rates. This allows the system to transmit high-quality audio data when needed while providing lower-quality alternatives for devices with limited bandwidth or storage, effectively managing the trade-off between quality and data quantity
Solution Approach 2:
The system dynamically selects and switches between different audio adaptation sets based on the user's head orientation and the capabilities of the playback device. This dynamic adaptation allows the system to optimize the balance between audio quality and data size in real-time
3Adaptability or versatility
If real-time audio adaptation is implemented for user movement, then audio immersion is improved, but processing time increases
Solution Approach 1:
The system pre-encodes multiple audio adaptation sets in advance during the content creation phase. This preliminary preparation eliminates the need for real-time encoding, reducing processing time while maintaining the ability to adapt audio to user movement and device capabilities
Solution Approach 2:
The system uses dynamic selection mechanisms to switch between pre-encoded audio adaptation sets based on user head orientation and device capabilities. This dynamic switching provides real-time adaptation without the computational burden of real-time encoding, thus reducing processing time
Data Source
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AI summary
A device and method for backward compatibility for virtual reality (VR), mixed reality (MR), augmented reality (AR), computer vision, and graphics systems. The device and method enable rendering audio data with more degrees of freedom on devices that support fewer degrees of freedom. The device includes memory configured to store audio data representative of a soundfield captured at a plurality of capture locations, metadata that enables the audio data to be rendered to support N degrees of freedom, and adaptation metadata that enables the audio data to be rendered to support M degrees of freedom. The device also includes one or more processors coupled to the memory, and configured to adapt, based on the adaptation metadata, the audio data to provide the M degrees of freedom, and generate speaker feeds based on the adapted audio data.