I suspect that depending of chosen virtual mic configuration there is so much low frequency gain added that you boost the level of the nearly always existing 50Hz hum so much that you actually hear it. It has sometimes happened to me that I need to lower the input level of the signal to the ambisonic decoder otherwise i got signal clipping in the processing stage.
BR Bo-Erik 2018-05-07 18:30 GMT+02:00 Gerard Lardner <glard...@iol.ie>: > I'm very much an amateur here, so please forgive what might be a stupid > question! > > I recorded a concert on Saturday (John Rutter's /Gloria /and Karl Jenkins' > /The Peacemakers/) using an Ambisonic mic and some others. I'm encoding the > A-format to B-format using VVEncode in Reaper, and panning in the extra > mics using Wigware Ambipan. The result is then decoded to surround sound or > to stereo using VVDecode; all in the same Reaper set-up. I've used this > approach before, usually successfully. > > I find that, when the organ and brass are playing at full volume (I mean > in the orchestra, not just in playback), there is a 'buzzing' sound in the > playback. It sounds harsh, pitched at about 50 Hz. But if I listen to the > A-format files alone in Reaper or in VLC Media Player, there is no buzz. > Similarly, there is no buzz if I encode the A-format using the stand-alone > version of VVMic. The buzz is present both in the B-format from the > Ambisonic mic and, less strongly, in the panned B-format from the soloists > mic. It appears to be an artefact of my editing configuration; but it > didn't happen in a recording I made, using the same configuration, last > month. The only difference since then has been that my old hard disc, which > had developed some faults, was cloned onto a new SSD. > > Does this description suggest a specific problem/remedy to anyone? I know > I can produce a decent CD using the stand-alone VVMic route and panning in > the soloists into the stereo mix; but I'd like to get to the bottom of why > my Ambisonic configuration is doing this now. > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: <https://mail.music.vt.edu/mailman/private/sursound/attachme > nts/20180507/fffd5727/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. > -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://mail.music.vt.edu/mailman/private/sursound/attachments/20180507/d2a3faae/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.
