Against that, there's the statement that the buzz was also present "less
strongly, in the panned B-format from the soloists mic" where there
shouldn't be any bass gain at all. Sounds to me like something in the
playback set up. Can you go and listen to it on someone else's rig?
Dave
On 7 May 2018 at 21:41, Bo-Erik Sandholm <bosses...@gmail.com> wrote:
> 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.
> >
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--
As of 1st October 2012, I have retired from the University.
These are my own views and may or may not be shared by the University
Dave Malham
Honorary Fellow, Department of Music
The University of York
York YO10 5DD
UK
'Ambisonics - Component Imaging for Audio'
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