Trond, not sure if this will be of any help but I had contacted Izotope Support about best practices for denoising B-format last year. (A-format was not an option for us since our Soundfield ST450 MKII mic outputs B-format directly.)
Here was their answer: "I spoke with our head DSP Engineer about what some best practices might be in order to avoid any phasing issues when processing B-format audio in RX. When De-noising your 4 mono audio tracks within RX 5 you have the option to use the Spectral De-noiser or the Dialogue De-noiser. The Spectral De-noiser won’t affect the phase of your audio so it should be safe to use. The Dialogue De-noiser, however, does use some non-linear equalization and compression/gating that may affect the phase in an undesirable way if processed heavily. That being the case I would recommend using the Spectral De-noiser to de-noise your B-format audio." Regards, Jean-Pascal Beaudoin | *Headspace Studio* Co-founder / Head of Sound +1 514-746-8461 2016-01-10 13:12 GMT-05:00 Trond Lossius <trond.loss...@bek.no>: > Thanks for all the replies to my initial question. > > I have done some testing with all three approaches today. My conclusion so > far is that running noise reduction on the B-format signal as two stereo > pairs (WX and YZ) ends up distorting the sound field (spatial artefacts, > less pronounced spatialisation). Doing it on the A-format signals sounds > much better. I’ve not yet reached any conclusion on whether there are any > differences between processing the original recorded A-format signals, or > A-format signals decoded from B-format using ATK. > > But workflow-wise it seems faster to do this using the VST/AU plugins > rather than the standalone application, with all the splitting and linking > of audio files required in that process. > > Best, > Trond > > _______________________________________________ > Sursound mailing list > Sursound@music.vt.edu > https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, > edit account or options, view archives and so on. > -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://mail.music.vt.edu/mailman/private/sursound/attachments/20160110/a8d3aeeb/attachment.html> _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on.
