XR Audio Rendering via Scene Manager Metadata Mapping
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Solution Overview
Problem
Current extended reality systems face challenges in providing an immersive audio experience due to the asynchronous capture and rendering of audio and visual elements, leading to mismatched audio metadata that does not accurately correspond to visual elements, resulting in a less immersive experience.
Innovation Solution
A separate audio interface is introduced that synchronizes audio playback with visual elements through a scene manager, which maps and modifies audio metadata to match the corresponding visual elements, ensuring accurate rendering of audio elements to speaker feeds, thereby enhancing the immersive experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If audio elements are captured asynchronously with visual elements or added later during XR mediation, then the audio playback system can operate with flexible timing, but the audio metadata does not accurately correspond to visual elements, reducing immersion
Solution Approach 1:
The scene manager performs preliminary mapping between audio elements and visual elements before audio rendering. By establishing correspondence relationships in advance using unique identifiers and metadata, the system prepares accurate audio-visual alignment data that will be used during the actual audio playback, ensuring precision even when capture times differ
Solution Approach 2:
The scene manager acts as an intermediary between the audio subsystem and visual subsystem. It receives audio elements with metadata, maps them to corresponding visual elements using unique identifiers, and produces modified audio metadata that accurately reflects the visual scene configuration, thereby bridging the timing and synchronization gap between audio and visual capture
2Productivity
If audio metadata is used without modification, then the audio processing pipeline operates efficiently, but the audio rendering does not accurately match the visual scene, degrading immersive experience
Solution Approach 1:
The audio metadata automatically modifies itself through the scene manager's mapping process. The scene manager takes the original audio metadata, enriches it with visual element correspondence information, and outputs modified audio metadata that contains both audio properties and accurate visual scene alignment data, enabling the audio system to self-correct without external intervention
Solution Approach 2:
The scene manager changes the parameters of audio metadata by adding and modifying fields such as pose information, spatial coordinates, and visual element associations. This parameter transformation converts raw audio metadata into enhanced metadata that accurately reflects the visual scene configuration while maintaining audio processing compatibility
Data Source
AI summary
A device configured to process a bitstream may implement the techniques. The device comprises a memory configured to store the bitstream representative of at least one audio element in an extended reality scene, and audio descriptive information associated with the at least one audio element. The device also comprises processing circuitry coupled to the memory and configured to execute a scene manager and an audio unit. The scene manager is configured to construct, based on the at least one audio element, a scene graph that includes at least one node that represents the at least one audio element, and modify, based on the scene graph, the audio descriptive information to obtain modified audio descriptive information. The audio unit is configured to render, based on the modified audio descriptive information, the at least one audio element to one or more speaker feeds, and output the one or more speaker feeds.