dear Curtis
I am happy you like the brahma microphone. can you please post some samples on
ambisonia.com. particularly bird song, as it will be some time before I can go
out and record (might be able to get some good monsoon recordings in south
india though, when I shift there) There are many queries about how Brahma works
for nature recordings, and I am hoping to build a 25 mm capsule version just
for such use.
umashankar
> From: curtis.alc...@tiscali.co.uk
> Date: Thu, 14 May 2015 11:33:02 +0100
> To: sursound@music.vt.edu
> Subject: Re: [Sursound] Converting 16 mic array recording to B format
>
> Thank you everyone who contributed to answering my question. I am now fully
> convinced that using the DEMAND library would be next to useless and not
> worth the work involved in trying to make it (partially) usable. Pity really,
> as a database of everyday noise would be a useful resource – but only if it's
> done properly in the first place.
>
> I am in the process of doing my own field recordings using a Brahma mic (been
> impressed with results so far: birdsong; a very noisy, reverberant
> restaurant; organ playing in a church) but as it will take some time to build
> up a complete library I was looking for some other material I could use,
> particularly every day environments.
>
> Thanks, Richard, for your suggestion of ambisonia.com. I started there but
> was having trouble downloading the torrent files. (The internet access I have
> here (in a shared building) blocks torrent files so I need to download
> somewhere else then transfer.) Will continue to pursue this route.
>
> Thanks again, everyone.
>
> On 14 May 2015, at 19:11, Richard Lee <rica...@justnet.com.au> wrote:
>
> > Duu.uuh!! http://parole.loria.fr/DEMAND/DEMAND.pdf states
> >
> > "the microphones of the array ... are not calibrated with respect to each
> > other, and so gain variations are to be expected: we found that the energy
> > in some channels is consistently higher than in other channels. Algorithms
> > working on this data should compensate for this variation"
> >
> > ie they haven't a clue what each capsule is doing.
> >
> > This precludes any attempt at conversion to B-format and also of
> > beamforming.
> >
> > I was hoping this might lead to a discussion about EigenMike and how it
> > might be made good enough to record music but this is certainly NOT the
> > vehicle.
> >
> > I can't help feeling they should beg borrow or steal a TetraMic and repeat
> > their recordings.
> >
> > Presently, about all you can say is they have a close bunch of unspecified
> > mikes in some sort of horizontal pattern.
> >
> > Curtiss, if you are after some 'realistic' atmospheric background (and this
> > is something TetraMic and properly aligned Soundfields do better than an
> > ything else), try ambisonia.com and recordings by John Leonard
> > (soundmanjohn), Paul Doombusch, JH Roy & others.
> >
> > John Leonard's specialty is WW2 aircraft flyovers but he includes a lot of
> > airfield noise too :) He's also got some very realistic street scenes,
> > audience noise, applause etc too.
> >
> > Aaron, you are right about SVD not being much use here as we have multiple
> > solutions but I was hoping to dream up something to help S/N at LF.
> >
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