Object-Based Audio Rendering via Vector Base Amplitude Panning
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Solution Overview
Problem
Traditional channel-based audio distribution systems are inflexible and incapable of accurately rendering sound in three-dimensional space, limiting their ability to create a true 3D or multi-dimensional audio experience due to fixed channel configurations and neglect of psychoacoustic principles.
Innovation Solution
The method involves using modified Vector Base Amplitude Panning (VBAP) to determine audio reproducing parameters for sound reproduction devices, positioning virtual sound sources in three-dimensional spaces, and combining gain factors to ensure accurate audio rendering across multiple devices, allowing audio to appear as if it emanates from specific virtual sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional channel-based audio distribution systems are used, then the system structure is simple and fixed, but the system is inflexible and incapable of accurately rendering sound in three-dimensional space
Solution Approach 1:
The patent implements dynamic adaptability by enabling the audio system to adjust channel mappings and spatial parameters in real-time based on the playback configuration. The system dynamically determines the number and positioning of reproduction channels, allowing it to adapt from stereo to multi-channel surround sound configurations without requiring fixed hardware connections.
Solution Approach 2:
The patent creates a universal audio distribution system that can serve multiple playback configurations through a single interface. By implementing object-based audio encoding with spatial parameters, the system can be reproduced on any number of channels (stereo, 5.1, 7.1, etc.), making one audio stream compatible with diverse playback environments.
2Adaptability or versatility
If downmixing is used to reduce the number of channels, then the system can accommodate playback configurations with fewer reproduction channels, but the audio quality and spatial accuracy are degraded
Solution Approach 1:
The patent applies preliminary action by pre-encoding audio objects with complete spatial parameters (position, distance, direction) during production. This allows the spatial information to be preserved in the encoded data structure, enabling accurate spatial reproduction even when the number of output channels is reduced, as the spatial parameters can be mathematically mapped to available channels without loss of positional accuracy.
3Measurement precision
If traditional channel-based systems are used, then the implementation is straightforward, but they are incapable of rendering sound accurately in three-dimensional space
Solution Approach 1:
The patent replaces the traditional mechanical/channel-based audio routing system with a computational object-based approach. Instead of physically assigning sounds to fixed channels, the system uses mathematical models and algorithms to calculate spatial parameters for each audio object, enabling precise 3D sound positioning through software processing rather than hardware constraints.
4Measurement precision
If the number of channels is increased to improve 3D audio rendering, then the spatial accuracy improves, but the system becomes more complex and less adaptable to different playback configurations
Solution Approach 1:
The patent implements dynamic adaptability by enabling the audio system to adjust channel mappings and spatial parameters in real-time based on the playback configuration. The system dynamically determines the number and positioning of reproduction channels, allowing it to adapt from stereo to multi-channel surround sound configurations without requiring fixed hardware connections.
Data Source
AI summary
Methods and systems of reproducing object-based audio are disclosed. In some embodiments, vector base amplitude panning (VBAP) is used for playing back an object's audio. Using the positioning of sound reproduction devices and object's location information, rendering can determine which sound reproduction devices are used for playing back the object's audio. For example, a triangle in which the object is positioned at a given time can be identified. The triangle can have sound reproduction devices as vertices, and the object's audio can be rendered on the sound reproduction devices corresponding to the vertices of the triangle. In some embodiments, ambiguities associated with VBAP-based rendering are identified and resolved.