Hi,
The recorded files will likely be four mono files, or less likely, an
interleaved four channel file.
The order of the files should be W, X, Y, Z.
ProTools, unless HD versions, only handle stereo files but can
probably import them as four mono flies.
Logic (in my experience) only has one multi-channel bus structure,
which can be quad or various versions of Dolby 5.1 etc.
De-interleaver can split interleaved files or interleave mono files.
http://www.birmingham.ac.uk/facilities/ea-studios/research/mulch.aspx
You should be able to import the files into either. You may need to
group channels together for editing even though it may all sound a
bit strange.
You could possibly botch a sort of stereo decoder by treating X and Y
as an MS signal, and add a bit of W to both X and Y.
It seems that most plug-in decoders have settings for fixed arrays.
Good enough for editing on quad or 5.1 systems, but not for large
arrays.
ProTools and Logic don't have good architectures for using
ambisonics. Reaper is much better, though I haven't used it very
seriously, and it can be a bit confusing initially.
If you are on Mac you could try my free 3DAS Ambisonic Decoder.
http://www.3d-audioscape.com/downloads.html
It is a stand alone decoder with a WXYZ input, and can address 8
speakers, regular arrays best. You can use Soundflower to get the
output of any DAW into it, and it then outputs to your audio
interface. Alternatively you can output the four channels to your
audio interface and run the decoder on another machine with a bigger
audio interface.
It was built with Max, and similar things I have made have run on
various Mac OS versions, though it has not been used yet on El
Capitan. It should be OK, but no guarantees.
It is only an 8-channel version as it was aimed at beginners with
ambisonics. None of my software has huge numbers of users, so there
hasn't been much feedback. Martyn Ware uses it a lot. More output
channels are fairly straightforward to implement, though it is
questionable whether first order ambisonics benefits from having more
than eight speakers.
There are, of course, other decoders, none of which I've used in
earnest.
Wigware
Harpex
harpex.net
Reputedly the best, processing first order ambisonic signals to
something like higher orders.
BlueRipple
et al.
Good luck,
Dave Hunt
On 4 Sep 2016, at 17:00, sursound-requ...@music.vt.edu wrote:
From: Ross Adams <ross.adams...@gmail.com>
Date: 4 September 2016 14:08:44 BDT
To: sursound@music.vt.edu
Subject: [Sursound] b-format decoders
Hello,
I made some recordings on a soundfield st250 in b-format.
Please could you recommend a decoder i can use in pro-tools 10 or
Logic x that will allow me to make the four stems into stereo files
or a decoder that I can place on the master out so that I could
edit the files whilst listing in stereo.
Also a decoder that would allow me to play back the stems as b-
format files through a multi-speaker array within a live
performance realm.
Thank you in advance.
Ross
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