Real-Time Spatial Audio Rendering System for Virtual Environments
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Solution Overview
Problem
Real-time communication devices often support only mono-channel recording and audio codecs may not support stereo audio, limiting the ability to provide a realistic spatial audio experience in virtual environments, where users need to distinguish multiple audio sources' directions and distances.
Innovation Solution
A real-time spatial audio rendering system that converts mono audio signals into stereo by determining dynamic source locations, applying Head-Related Impulse Responses and gain control, and optionally incorporating reverberation using Binaural Room Impulse Responses to generate anechoic and reverberant audio signals for immersive playback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If mono audio signals are used from audio sources, then device compatibility and codec support are improved, but spatial audio quality and directional perception are worsened
Solution Approach 1:
The system changes the parameter of audio channel configuration from mono to stereo dynamically. It detects the number of active audio sources and adjusts the output channel configuration accordingly, transforming single-channel audio signals into multi-channel spatial audio through real-time parameter adaptation.
Solution Approach 2:
The patent introduces an intermediary spatial audio rendering system that processes mono audio signals from multiple sources. This intermediary system calculates dynamic locations of audio sources and applies appropriate mixing algorithms to generate stereo audio, acting as a mediator between the mono audio inputs and the stereo output requirement.
2Loss of information
If real-time spatial audio rendering is implemented, then directional perception and listening experience are improved, but processing complexity and computational requirements are worsened
Solution Approach 1:
The system implements dynamic spatial audio rendering where the audio mixing parameters are continuously adjusted based on the real-time positions of audio sources and the listener. The mixing coefficients and channel assignments are dynamically recalculated as sources move within the virtual environment, maintaining accurate spatial perception without requiring pre-rendering.
Solution Approach 2:
The patent segments the spatial audio rendering process into distinct functional modules: audio source detection, location tracking, rendering parameter calculation, and stereo output generation. This segmentation allows each module to be optimized independently and facilitates real-time processing by breaking down the complex rendering task into manageable computational stages.
3Loss of information
If stereo audio is generated from mono sources, then spatial perception is improved, but time delay and processing latency are worsened
Solution Approach 1:
The system performs preliminary calculations of rendering parameters based on the current positions of audio sources and the listener. By pre-computing the mixing coefficients and channel assignments before the actual audio mixing occurs, the system minimizes the processing time required during real-time playback, reducing latency while maintaining accurate spatial perception.
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
Enables users to perceive the direction and distance of audio sources in virtual environments with minimal time delay, enhancing the realism of audio rendering and providing a closer-to-real-world listening experience, even with mono audio inputs.
Implementation Method 1
The binaural effect requires that the sound wave signals, received by the listener's two ears, have two different time delays and spectral energy distributions
Implementation Method 2
convoluting the modified audio signals by the modified HRIRs to generate spatial audio signals of each mono audio source
Implementation Method 3
generating Binaural Room Impulse Responses (BRIRs) based on a set of dimensions of a room of the listener and positions of the listener and the set of mono audio sources
Data Source
AI summary
A new real-time spatial audio rendering system includes a real-time spatial audio rendering computer software application adapted to run on a communication device. The application renders stereo audio from mono audio sources in a virtual room of a listener. The listener can be mobile. The stereo audio is rendered for each listener within the room. The real-time spatial audio rendering system has two different modes, with and without reverberation. Reverberation can provide the sense of the dimensions of the room. First, the anechoic processing module produces the anechoic stereo audio that provides the sense of direction and distance of spatial audio. When reverberation is desired, the reverberation processing module is also performed to provide the sense of the room's dimensions by the spatial audio.