Spatial Soundfield Processing Using Matrix Mixer Echo Simulation
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Solution Overview
Problem
Current multi-channel audio systems fail to effectively simulate reverberant acoustic environments, limiting the immersive listening experience by not accurately recreating the spatial and temporal aspects of sound fields.
Innovation Solution
A method and system that transform input soundfield signals using a multi-channel matrix mixer with spatial operations and frequency-dependent filtering to create simulated echoes with altered directions of arrival, producing a reverberant soundfield signal by combining delayed and rotated copies of the original signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If current multi-channel audio systems are used, then the system structure is simple, but the ability to simulate reverberant acoustic environments is insufficient
Solution Approach 1:
The audio signal processing is segmented into multiple discrete delay lines, each handling specific echo paths with unique time delays and spatial parameters. This segmentation allows the system to simulate complex reverberant environments by combining multiple simplified echo components rather than processing the entire sound field as a single complex operation.
Solution Approach 2:
Virtual acoustic sources are introduced as intermediary elements between the input audio signal and the output channels. These virtual sources represent reflected sound paths and enable the system to simulate reverberation by positioning virtual echo sources in specific spatial locations, which are then rendered through standard multi-channel audio rendering techniques.
2Measurement precision
If delayed signals are created and acoustically transformed to simulate echoes, then the reverberance simulation accuracy is improved, but the processing complexity increases
Solution Approach 1:
The system varies key acoustic parameters including time delay, spatial position, and frequency-dependent gain for each echo path. By systematically adjusting these parameters across multiple delay lines, the system accurately recreates the temporal and spatial characteristics of reverberant environments while maintaining manageable processing complexity through parameterized control.
Solution Approach 2:
The acoustic transformation parameters are made dynamic and adjustable, allowing the virtual echo sources to be positioned and configured based on the desired acoustic environment. This dynamic approach enables flexible simulation of different reverberation scenarios without requiring fixed, hardwired processing structures.
3Manufacturing precision
If multiple spatial operations including rotation and mirroring are applied, then the spatial audio effect realism is improved, but the computational load increases
Solution Approach 1:
Spatial transformation matrices for rotation and mirroring operations are pre-calculated and stored for common acoustic scenarios. This preliminary preparation allows the system to apply complex spatial transformations during real-time processing by simply applying pre-computed matrix operations rather than calculating transformations from scratch, significantly reducing computational load while maintaining spatial audio realism.
Data Source
AI summary
A method for creating an output soundfield signal from an input soundfield signal, the method including the steps of: (a) forming at least one delayed signals from the input soundfield signal, (b) for each of the delayed signals, creating an acoustically transformed delayed signal, by an acoustic transformation process, and (c) combining together the acoustically transformed delayed signals and the input soundfield signal to produce the output soundfield signal.