Multi-channel Matrix Mixer for Spatial Soundfield Echo Simulation
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Solution Overview
Problem
Current multi-channel audio systems fail to effectively simulate reverberant acoustic environments, particularly in Soundfield formats like Ambisonics, where the directionality and delay of echoes are not uniformly managed, leading to suboptimal spatial audio experiences.
Innovation Solution
A method and system utilizing a multi-channel matrix mixer with spatial operations, frequency-dependent filtering, and a Shared Echo Model to create a reverberant soundfield signal by applying consistent delays and geometric transformations to input soundfield signals, ensuring each echo has a direction of arrival based on the original audio component's direction, thereby simulating reverberance and enhancing audio effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current multi-channel audio systems are used to simulate reverberant acoustic environments, then the basic audio reproduction function is achieved, but the directionality and delay of echoes are not uniformly managed, leading to suboptimal spatial audio experiences
Solution Approach 1:
The patent segments the reverberation simulation into multiple independent echo paths, each with individually controlled delay and direction parameters. The soundfield is divided into discrete echo components that can be processed separately through the matrix mixer, allowing precise control over each echo's spatial characteristics without affecting others.
Solution Approach 2:
The system dynamically adjusts delay times and directional parameters for each echo path based on the input soundfield characteristics. The matrix mixer enables real-time modification of echo directions and delays, creating adaptive reverberation that responds to the spatial content of the input signal rather than using fixed parameters.
2Measurement precision
If a Shared Echo Model with consistent delays and geometric transformations is applied, then accurate reverberation simulation is achieved, but the system complexity increases due to multi-channel matrix mixing and spatial operations
Solution Approach 1:
The matrix mixer serves multiple functions simultaneously: it performs spatial rotation, mirroring, directional gain control, and echo path management within a single device. This multi-functionality reduces the need for separate processing stages while maintaining the complexity required for accurate reverberation simulation.
Solution Approach 2:
The system manages complexity by parameterizing the spatial transformations through geometric transformation matrices and delay parameters. By changing mathematical parameters rather than physical system architecture, the patent achieves accurate reverberation simulation with a unified processing approach that can be implemented through software or digital signal processing.
3Measurement precision
If spatial operations including rotation and geometric transformations are applied to manage echo directions, then the spatial accuracy of reverberant signals is improved, but the processing complexity and computational requirements increase
Solution Approach 1:
The patent pre-calculates geometric transformation matrices for common spatial operations such as rotations and mirrorings. These pre-computed transformation parameters are stored and applied during reverberation processing, reducing real-time computational requirements while maintaining spatial accuracy.
Solution Approach 2:
The system uses copying of transformation matrices and spatial parameters across multiple echo paths. Once a geometric transformation is defined for a particular echo direction, the same transformation parameters are copied and applied to similar echo paths, reducing the overall computational burden while maintaining consistent spatial accuracy.
Data Source
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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.