Ambisonics Audio Signal Processing for Spatial Sound Rendering
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Solution Overview
Problem
Current audio signal processing technologies for head-mounted display devices face challenges in efficiently transmitting and rendering realistic spatial sound due to limitations in computation and power consumption, particularly when dealing with a limited number of encoding streams, which affects the processing of diegetic and non-diegetic audio signals.
Innovation Solution
An audio signal processing method and apparatus that generates an output audio signal by synthesizing ambisonics signals with non-diegetic channel signals, using filters based on virtual channel information to reduce the number of encoding streams required, allowing for efficient transmission of spatial sound even with limited codec support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of encoding streams is increased to transmit both diegetic and non-diegetic audio signals separately, then the audio quality and spatial sound reproduction are improved, but the device complexity and computational burden increase beyond the limits of mobile devices
Solution Approach 1:
The patent combines diegetic and non-diegetic audio signals into a single ambisonics signal by mapping non-diegetic channel signals to corresponding ambisonics components. This merging allows both audio types to be transmitted through limited encoding streams while maintaining their distinct characteristics and spatial properties.
Solution Approach 2:
The ambisonics signal format serves multiple functions simultaneously: it carries both diegetic and non-diegetic audio content, supports spatial sound reproduction, and adapts to limited encoding stream constraints. This multi-functionality resolves the contradiction by making a single signal format capable of handling diverse audio requirements.
2Manufacturing precision
If separate encoding streams are used for diegetic and non-diegetic audio signals, then the processing efficiency and audio rendering accuracy are improved, but the power consumption and computational load exceed mobile device capabilities
Solution Approach 1:
The patent merges separate processing paths for diegetic and non-diegetic signals into a unified ambisonics processing pipeline. By converting non-diegetic channel signals to ambisonics components and combining them with diegetic ambisonics signals, the system reduces computational overhead while maintaining rendering accuracy through efficient signal synthesis.
3Adaptability or versatility
If the number of encoding streams is limited, then the compatibility with user equipment and playback software is improved, but the ability to transmit realistic spatial sound with both diegetic and non-diegetic effects is degraded
Solution Approach 1:
The patent changes the parameter representation of non-diegetic audio by converting channel signals to ambisonics components. This parameter transformation allows the audio to be expressed in a format that is compatible with limited encoding streams while preserving spatial sound characteristics through the ambisonics framework's inherent spatial encoding capabilities.
Data Source
AI summary
Disclosed is an audio signal processing apparatus for rendering an input audio signal. The audio signal processing apparatus may include a processor configured to obtain an input audio signal including an ambisonics signal and a non-diegetic channel difference signal, render the ambisonics signal to generate a first output audio signal, mix the first output audio signal and the non-diegetic channel difference signal to generate a second output audio signal, and output the second output audio signal.