31 Jul
2007
31 Jul
'07
3:56 a.m.
Hello!
What would be the command line magic to get stereo wav mixed to mono and
left channel inverted before the mixdown?
Background:
I have recorded vocals with M-Audio Microtrack 24/96 (portable recorder)
and I've used mic cable that has one xlr connector to the mic and two mono
plugs to the recorder, which records stereo.
To get the final mono, I have to invert one of the channels and mix it
with the other. This way all the errors on the signal get canceled.
I've done this with audacity, but it's rather lengthy operation if I have
several files to convert.
Tommi
31 Jul
31 Jul
6:01 a.m.
Hi!
I's say ecasound or csound. For csound I have a one-step idea:
vim test.orc
sr = 44100 ; your samplerate
kr = 4410 ; your controller rate
ksmps = 10 ; sr/kr
nchnls =1 ; number of output-channels
instr 1
a1, a2 soundin "in.wav"
a1 = a1 * -1 ; invert left channel
out a1*.5 + a2*.5 ; add left and right channels with half volume
endin
vim test.sco
i1 0 30 ; perform instrument 1 for 30 seconds
csound -W -o out.wav test.orc test.sco
With ecasound I can only think of a multi-step solution, which can, on the
other hand be scripted:
ecasound -f:16,2,44100 -i in.wav -chcopy:1,2 -f:16,1,44100 -o tmp1.wav
# now its mono, I copied left channel to right, to make sure we don't get any
left channel mixed in, because I'm not sure about this stereo to mono
conversion.
ecasound -i tmp1.wav -o tmp2.wav -ea:-110
# invert file, apply volume of -100
ecasound -f:16,2,44100 -i in.wav -chcopy:2,1 -f:16,1,44100 -o tmp3.wav
# now created mono-file with only right-channel
ecasound -a:1 -i tmp2.wav -ea:50 -a:2 -i tmp3.wav -ea:50 -a:all -o out.wav
-z:mixmode,sum
# mix inverted left to right channel.
I probably did this more complicated than it could be. But this should work.
Hope that helps!
Kindest regards
Julien
--------
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======== FIND MY WEB-PROJECT AT: ========
http://ltsb.sourceforge.net
the Linux TextBased Studio guide
======= AND MY PERSONAL PAGES AT: =======
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1:15 p.m.
On Tue, Jul 31, 2007 at 08:56:12AM +0300, Tommi Sakari Uimonen wrote:
I have recorded vocals with M-Audio Microtrack 24/96
(portable recorder)
and I've used mic cable that has one xlr connector to the mic and two mono
plugs to the recorder, which records stereo.
To get the final mono, I have to invert one of the channels and mix it
with the other. This way all the errors on the signal get canceled.
From what you've described, wouldn't the signal
get cancelled too?
confused...
-PW
--
Paul Winkler
http://www.slinkp.com
9 Aug
9 Aug
5:11 p.m.
To get the
final mono, I have to invert one of the channels and mix it
with the other. This way all the errors on the signal get canceled.
From what you've described, wouldn't the signal get cancelled too? 
31 Jul
31 Jul
2:45 p.m.
Hi,
On Tue, Jul 31, 2007 at 08:56:12AM +0300, Tommi Sakari Uimonen wrote:
Hello!
What would be the command line magic to get stereo wav mixed to mono and
left channel inverted before the mixdown?
What about
sox stereo.wav -c 1 mono.wav avg -0.5,0.5
Jacob
Background:
I have recorded vocals with M-Audio Microtrack 24/96 (portable recorder)
and I've used mic cable that has one xlr connector to the mic and two mono
plugs to the recorder, which records stereo.
To get the final mono, I have to invert one of the channels and mix it
with the other. This way all the errors on the signal get canceled.
I've done this with audacity, but it's rather lengthy operation if I have
several files to convert.
Tommi
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5 comments
5 participants
participants (5)
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Jacob -
Julien Claassen -
Kevin Cosgrove -
Paul Winkler -
Tommi Sakari Uimonen