The recording was made using a Brahma, no. 008.
I used the same set-up of mics and en/decoders in Reaper to record
another choral concert for Passion Sunday, the weekend before Easter. I
had no such problems with that recording (only coughing in the
audience!). But in that case there was only a small chamber orchestra
and a chamber organ.
I'll try to make time tomorrow to post some short extracts from the
recording causing trouble, both the A-format and B-format as requested
by Fons Adriaensen. I'll also try X-Volver, as suggested by David
McGriffy and see if there is any difference there. But given the
apparent success I have had with previous recordings, I am not jumping
to blame VVEncoder, Ambipan or VVDecoder; I'd sooner blame some
oversight or stupidity on my part. I don't do this stuff often enough to
claim to be any kind of expert, or anything more than lucky.
TBH, I had a problem with the previous recording where it was recorded
at 44.1 kHz, but Reaper seemed to think it should be played back as if
it was recorded at 48 kHz, resulting in the pitch dropping by almost a
tone. I sorted it at the time, but I don't really understand what was
happening and can't remember how I fixed it. I used that same Reaper
set-up for this latest concert, just dropping the new audio tracks into
it. Could that be part of the problem?
Gerard Lardner
On 11/05/2018 16:39, umashankar manthravadi wrote:
Was it a brahma mic ? I got the impression it was not. If it is a Brahma, and I
get its serial number, I can take a look.
umashankar
Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10
________________________________
From: Sursound <sursound-boun...@music.vt.edu> on behalf of David McGriffy
<da...@mcgriffy.com>
Sent: Friday, May 11, 2018 8:44:33 PM
To: Surround Sound discussion group
Subject: Re: [Sursound] [allowed] Re: Strange 'buzz' in Ambisonic recording
Given that this is a Brahma, it uses FFT based processing. My suspicion is
that the artifact is actually something in the FFTs like a windowing
problem or a bug handling the first FFT bins. At 48kHz, 1K block
boundaries would be about 48Hz.
Does using Xvolver give the same artifact? IIRC I read that code and tried
to do the FFT filters in a compatible way in VVEncode so it could be they
both have the same trouble or it could just be a bug in my code.
David
VVAudio
On Fri, May 11, 2018 at 9:13 AM Fons Adriaensen <f...@linuxaudio.org> wrote:
On Fri, May 11, 2018 at 01:03:57AM +0100, Gerard Lardner wrote:
Actually really only when the organ is playing; the brass is usually with
the organ, but not always. The buzz is present when the organ is playing
loudly.
Could you make available a small part (20 seconds or so) of the original
A-format file and the encoded B-format one for the part where you hear
the 'buzz' ??
--
FA
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