| Popis: |
This work further develops the theory of Spherical Wavelet Format (SWF), a spatialaudio format inspired by Ambisonics that makes use of Spherical Wavelets asa basis to decompose the soundfield. In particular, we have specified aversionofSWFthatimplements a method to build an arbitrary wavelet representation on anarbitrary triangular mesh. We make use of a modified lifting scheme to optimizethe interpolating scaling functions for optimal playback reproduction, and we have demonstrated its functionality and competitiveness with state-of-the-art spatial audioalgorithms on a 7.1.4 layout. The resulting SWF specification is available foruse and further research in an open source python library. The python library isflexible enough to support any layout, and includes presets for the original Octahedralmesh from the first publication of SWF, as well as the 7.0.4-based SWFformat used for objective and subjective evaluation in this report, and a SphericalWavelet Format that naturally interpolates between standard surround soundformats (11.1.8,9.1.6,7.1.4,etc.). The library is intended to be used with the trivialdecoding from the coarsest level of mesh, but can also be decoded using otherstrategies from less coarse representations. |
