Thanks Trond and Archontis for the information and comments. interesting that synthetic material gives problems.
and of course upMIXING makes much more sense! I hope to get a chance to do some experiments myself with FOA field recordings on a HOA rig after the summer. best wishes, Justin >> >> > > Hi Justin, > > To my experience, parametric methods such as Harpex or DirAC deal greatly > with field recordings, since there is always enough ?activity? and natural > variability in the sound scene that is analyzed and reproduced reasonably by > the method?s underlying model. This is in contrast for example to synthetic > material, in which you can generate unnatural cases that can ?confuse? the > model, e.g. six anechoic saw-tooth waves coming from various angles > simultaneously with the same fundamental frequency. > > Also to my experience, and that doesn?t seem to be a very popular view yet in > ambisonic community, these parametric methods do not only upsample or sharpen > the image compared to direct first-order decoding, but they actually > reproduce the natural recording in a way that is closer perceptually to how > the original sounded, both spatially and in timbre. Or at least that?s what > our listening tests have shown in a number of cases and recordings. And the > directional sharpening is one effect, but also the higher spatial > decorrelation that they achieve (or lower inter-aural coherence) in > reverberant recordings is equally important. > > By the way, I have always considered the term upsampling a bit inaccurate for > this parametric FOA-to-HOA mapping., and has no relation to upsampling from a > signal processing POV. Upmixing would be more appropriate, since this is what > the methods are essentially doing internally, not dissimilar to the older > parametric upmixing methods from, e.g., stereo to surround. > > Regards, > Archontis _______________________________________________ Sursound mailing list [email protected] https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on.
