Multichannel Audio Rendering with Omnidirectional Extraction
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Solution Overview
Problem
Current methods for reproducing multichannel audio signals in a listening area fail to provide immersive and homogeneous sound distribution while maintaining spatialization, as they are constrained by the number and placement of loudspeakers, leading to limited spatial perception and installation challenges.
Innovation Solution
A method that analyzes the multichannel audio signal to extract an omnidirectional component and a residual component, where the omnidirectional component is reproduced uniformly using all loudspeakers for homogeneous intensity, and the residual component is spatialized using virtual sound sources, allowing for flexible loudspeaker configurations and enhanced spatialization effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of loudspeakers is increased to achieve homogeneous sound distribution, then sound coverage homogeneity is improved, but spatialization sensation deteriorates
Solution Approach 1:
The audio signal is segmented into two independent components: an omnidirectional component for homogeneous sound distribution and a residual component for spatialization. This segmentation allows each component to be processed and reproduced according to its specific requirements, resolving the contradiction between homogeneity and spatialization sensation
Solution Approach 2:
The omnidirectional component is extracted from the multichannel audio signal using correlation analysis between channels. This extracted component is then reproduced separately using all loudspeakers to ensure homogeneous sound coverage, while the residual component maintains spatialization effects
2Adaptability or versatility
If traditional multichannel audio restoration methods are used, then installation flexibility is reduced, but spatialization is compromised
Solution Approach 1:
The method changes the fundamental parameters of signal processing by introducing correlation-based component extraction and virtual sound source positioning. This allows the system to adapt to various loudspeaker configurations while maintaining both homogeneous sound distribution and spatialization quality
3Device complexity
If an even number of loudspeakers is used for stereophonic signal distribution, then channel distribution is simplified, but adaptability to irregular listening areas deteriorates
Solution Approach 1:
The method makes the loudspeaker system universal by enabling any number and arrangement of loudspeakers to reproduce both omnidirectional and spatialized components. The correlation-based extraction and virtual source techniques work independently of the specific loudspeaker configuration, providing adaptability to irregular listening areas while maintaining distribution simplicity
Data Source
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Figure 3
AI summary
The method comprises: — a multichannel audio signal analysis step (E20) comprising extraction of a multichannel component (Cl), referred to as an omnidirectional component, verifying a predetermined similarity criterion between at least two of the channels thereof; and — a restoration step (E30,E40,E50) in the listening zone, using all or some of N loudspeakers included in the listening zone, of the omnidirectional component and of a residual multichannel component (C2) of the multichannel audio signal obtained after extraction of the omnidirectional multichannel component, the omnidirectional multichannel component (Cl) being restored in a manner providing uniform intensity throughout the listening zone, and the residual multichannel component (C2) being restored by using a sound spatialization technique, creating a number K of virtual sound sources restored in the listening zone.