Adaptive Audio Rendering With Object Metadata for Theater Layouts
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Solution Overview
Problem
Current cinema audio systems struggle with accurately reproducing sound sources from multiple directions, including overhead, and lack flexibility in adapting to different playback environments, leading to inconsistent listener experiences and limited surround channel configurations.
Innovation Solution
An adaptive audio system that combines channel-based and object-based audio processing, using a new speaker layout and spatial description format, allowing audio streams to be rendered based on the characteristics of the playback environment, enabling precise sound positioning and improved audio-visual coherence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional channel-based audio systems are used, then the system is simple to implement, but the adaptability to different playback environments and the ability to accurately reproduce sound sources from multiple directions including overhead are limited
Solution Approach 1:
The system dynamically adapts audio rendering based on detected playback environment characteristics. The renderer adjusts audio object positioning and speaker feed generation in real-time according to the specific theater configuration, transitioning from static channel-based mixing to dynamic environment-responsive audio delivery.
Solution Approach 2:
The audio system is designed to universally adapt to multiple playback environments and speaker configurations. A single audio object-based representation can be rendered across diverse theater layouts by detecting environmental characteristics and adjusting the rendering parameters accordingly, eliminating the need for multiple environment-specific mixes.
2Measurement precision
If more surround channels are added to improve sound positioning accuracy, then the audio reproduction quality improves, but the system complexity and distribution requirements increase
Solution Approach 1:
The audio system segments the sound field into discrete audio objects with independent spatial parameters. Each audio object can be precisely positioned in three-dimensional space, and the renderer distributes these objects to appropriate speakers based on the detected environment, achieving high positioning accuracy without requiring a fixed complex speaker configuration.
Solution Approach 2:
The system changes the fundamental parameter representation from fixed channel assignments to dynamic audio object parameters. By representing sound sources as objects with position, velocity, and spatial extent parameters rather than fixed channel signals, the system achieves precise positioning control that adapts to varying speaker configurations without increasing structural complexity.
3Adaptability or versatility
If channel-based audio processing is used, then the distribution is simple with fixed speaker feeds, but the flexibility to adapt to different theater configurations and control discrete sound elements is limited
Solution Approach 1:
Audio objects serve as an intermediary representation between the source material and the final speaker feeds. This intermediate layer preserves spatial information and artistic intent while enabling flexible adaptation to different playback environments. The renderer acts as a mediator that translates audio objects into environment-specific speaker assignments without losing spatial coherence.
Solution Approach 2:
The audio objects are prepared in advance with complete spatial parameter information embedded, preserving all spatial relationships before rendering. This preliminary preparation of audio objects with position, velocity, and spatial extent data ensures that no spatial information is lost during distribution, while the actual speaker assignment is deferred until environment detection occurs at playback.
Data Source
AI summary
Embodiments are described for an adaptive audio system that processes audio data comprising a number of independent monophonic audio streams. One or more of the streams has associated with it metadata that specifies whether the stream is a channel-based or object-based stream. Channel-based streams have rendering information encoded by means of channel name; and the object-based streams have location information encoded through location expressions encoded in the associated metadata. A codec packages the independent audio streams into a single serial bitstream that contains all of the audio data. This configuration allows for the sound to be rendered according to an allocentric frame of reference, in which the rendering location of a sound is based on the characteristics of the playback environment (e.g., room size, shape, etc.) to correspond to the mixer's intent. The object position metadata contains the appropriate allocentric frame of reference information required to play the sound correctly using the available speaker positions in a room that is set up to play the adaptive audio content.