3D Audio Panning with Edge Fading for Large-Angle Localization
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Solution Overview
Problem
Existing 3D audio panning methods, such as Vector Base Amplitude Panning (VBAP), struggle with accurately localizing sound sources at large angles and maintaining symmetry in loudspeaker setups, leading to suboptimal sound reproduction and localization accuracy.
Innovation Solution
The proposed Edge Fading Amplitude Panning (EFAP) method uses polygons instead of triangles to define loudspeaker positions, allowing for symmetric panning gains and improved sound localization at large angles, while maintaining computational efficiency similar to VBAP.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If VBAP uses triangle-based triangulation for 3D panning, then computational efficiency is maintained, but symmetry is broken and localization accuracy deteriorates at large angles
Solution Approach 1:
The patent segments the spherical loudspeaker arrangement into multiple horizontal bands, each processed independently with its own set of active loudspeakers. This segmentation allows symmetric treatment within each band while maintaining overall computational efficiency through localized processing.
Solution Approach 2:
The patent transitions from 2D triangle-based VBAP to 3D polygon-based processing by incorporating vertical dimension through multiple horizontal bands. This dimensional extension enables symmetric panning gains while maintaining computational tractability through band-wise independent processing.
2Ease of manufacture
If VBAP uses arbitrary triangulation for rectangular loudspeaker arrangements, then implementation is simplified, but asymmetry is introduced and sound localization quality deteriorates
Solution Approach 1:
The patent deliberately introduces asymmetric horizontal bands with different vertical extents, where each band is processed independently. This controlled asymmetry in band definition actually preserves overall system symmetry by allowing each band to be processed with symmetric panning gains relative to its own center, avoiding the asymmetry introduced by arbitrary triangle diagonals.
Solution Approach 2:
The patent dynamically selects different sets of active loudspeakers for each horizontal band based on the phantom source position. This dynamic selection allows the system to adapt to different spatial regions while maintaining symmetric treatment within each band, improving localization quality without sacrificing implementation simplicity.
3Measurement precision
If more loudspeakers are added to extend listening area, then spatial resolution is improved, but placement requirements and system complexity increase
Solution Approach 1:
The patent makes each loudspeaker serve multiple functions by including it in multiple horizontal bands. A single loudspeaker can be an active loudspeaker for different bands simultaneously, allowing the system to achieve high spatial resolution with fewer physical loudspeakers and reducing placement complexity.
Solution Approach 2:
The patent uses partial sets of loudspeakers for different horizontal bands rather than requiring all loudspeakers to be optimally positioned for all directions. This partial action approach allows the system to achieve good spatial resolution in each band using only the relevant active loudspeakers, reducing overall placement requirements.
Data Source
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AI summary
An apparatus for generating four or more audio output signals is provided. The apparatus comprises a panning gain determiner (110) and a signal processor (120). The panning gain determiner (110) is configured to determine a proper subset from a set of five or more loudspeaker positions, so that the proper subset comprises four or more of the five or more loudspeaker positions. Moreover, the panning gain determiner (110) is configured to determine the proper subset depending on a panning position and depending on the five or more loudspeaker positions. Furthermore, the panning gain determiner (110) is configured to determine a panning gain for each of the four or more audio output signals by determining said panning gain depending on the panning position and depending on the four or more loudspeaker positions of the proper subset. The signal processor (120) is configured to generate each audio output signal of the four or more audio output signals depending on the panning gain for said audio output signal and depending on an audio input signal.