Higher Order Ambisonic Audio Renderer Sparseness Metadata
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Solution Overview
Problem
Current audio rendering technologies lack the ability to consistently convey the artistic intent of higher-order ambisonic audio content across various speaker configurations, leading to inconsistent playback experiences.
Innovation Solution
The specification of audio rendering information in a bitstream allows playback devices to accurately render audio content by including details such as rendering matrices and algorithms, ensuring that the intended sound field is reproduced regardless of speaker geometry or acoustic conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If audio content is rendered using a specific renderer during production, then the artistic intent can be tailored for target speaker configurations, but the rendering information is lost during compression and cannot be conveyed to playback devices
Solution Approach 1:
The rendering information (renderer type, order, channel count, matrix data) is prepared and embedded into the bitstream during the audio encoding stage, before transmission or storage. This preliminary inclusion ensures that playback devices receive complete rendering instructions without needing to recompute or guess the intended rendering parameters.
Solution Approach 2:
A metadata structure serves as an intermediary carrier, bridging the gap between the production renderer and playback renderer. This metadata contains all necessary rendering parameters and is transported within the bitstream, allowing the artistic intent to be faithfully transmitted from encoding to decoding without direct connection between production and playback environments.
2Reliability
If rendering information is included in the bitstream to enable consistent playback, then the artistic intent can be preserved across different playback devices, but the data transmission size and processing complexity increase
Solution Approach 1:
The rendering information is encoded using efficient parameter representations (e.g., order values, channel counts, renderer type identifiers) that convey maximum information with minimum bits. By optimizing the parameter encoding scheme, the patent reduces the metadata size while maintaining complete rendering capability.
Solution Approach 2:
The patent selectively includes only the essential rendering parameters needed for faithful reproduction, discarding redundant or optional information. The metadata structure is designed to contain precisely what is necessary for rendering consistency, avoiding unnecessary complexity while maintaining reliability.
3Manufacturing precision
If different renderers are used during production and playback, then the audio content may not be reproduced as intended, but requiring identical renderers limits adaptability to different speaker configurations
Solution Approach 1:
The metadata structure is designed to be universally applicable across different renderer types and speaker configurations. By encoding the specific rendering parameters (order, channel count, matrix data) rather than hardcoding renderer-specific instructions, the system can adapt to various playback configurations while maintaining the artistic intent specified during production.
Data Source
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AI summary
In general, techniques are described for obtaining audio rendering information in a bitstream. A device configured to render higher order ambisonic coefficients comprising a processor and a memory may perform the techniques. The processor may be configured to obtain sparseness information indicative of a sparseness of a matrix used to render the higher order ambisonic coefficients to a plurality of speaker feeds. The memory may be configured to store the sparseness information.