Audio Rendering Air Absorption Compensation
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Solution Overview
Problem
Current audio rendering methods fail to accurately account for air absorption attenuation in immersive audio environments, leading to changes in the timbre of sound sources due to recording distances, which affects the realism of spatial sound reproduction in 6DoF settings.
Innovation Solution
An audio rendering method that determines air absorption attenuation based on the difference between the source distance and the recording distance, using a compensation equalizer to adjust the audio signal accordingly, and includes a recording distance parameter in the bitstream syntax to ensure accurate timbre representation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If air absorption attenuation is calculated based on source distance only, then the calculation is simple, but the timbre rendering is inaccurate due to superposition of air absorption effects
Solution Approach 1:
The recording distance information is pre-stored in the metadata of the audio signal during the recording or encoding phase. This preliminary action allows the renderer to directly retrieve and use this information without performing complex real-time measurements or calculations, thereby improving timbre rendering accuracy while avoiding excessive computational complexity.
Solution Approach 2:
The patent introduces recording distance as an intermediary parameter that mediates between the physical recording conditions and the virtual rendering environment. By using this intermediary, the system can accurately compensate for air absorption effects without requiring complex direct measurements of the virtual space, thus resolving the contradiction between accuracy and complexity.
2Measurement precision
If recording distance information is stored in metadata, then air absorption compensation is accurate, but the data structure becomes more complex
Solution Approach 1:
The recording distance parameter stored in metadata serves multiple functions: it enables accurate air absorption compensation, provides spatial positioning information, and supports various rendering scenarios. This multi-functionality justifies the additional data structure complexity by providing comprehensive benefits across different application scenarios.
Solution Approach 2:
The patent modifies the existing metadata structure by adding the recording distance parameter, transforming the data structure to accommodate more precise acoustic information. This parameter change enables accurate air absorption compensation while maintaining compatibility with existing audio formats and rendering pipelines.
3Reliability
If air absorption is compensated for recording distance, then timbre realism is improved, but processing time increases
Solution Approach 1:
By pre-storing the recording distance information in metadata during encoding or recording, the system eliminates the need for complex real-time analysis of recording conditions. This preliminary action significantly reduces processing time during rendering while maintaining accurate timbre realism through proper air absorption compensation.
Solution Approach 2:
The audio signal itself carries the recording distance information within its metadata, allowing the rendering system to automatically retrieve and use this information without requiring external input or complex calculations. This self-service approach improves timbre realism while minimizing additional processing time.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively prevents the superposition of air absorption effects, allowing for accurate rendering of sound source timbre changes and level adjustments, enhancing the realism of immersive audio experiences in 6DoF environments by compensating for air absorption attenuation.
Implementation Method 1
air absorption attenuation based on a distance obtained by subtracting the recording distance from the source distance
Data Source
AI summary
An audio rendering method and an electronic device performing the same are disclosed. The disclosed audio rendering method includes determining an air absorption attenuation amount of an audio signal based on a recording distance included in metadata of the audio signal and a source distance between a sound source of the audio signal and a listener; and rendering the audio signal based on the air absorption attenuation amount.