10 Mar
2016
10 Mar
'16
12:59 p.m.
Hello,
I want to deliver to my DAC two mono signals out of phase.
I did the following asound.conf (PS I'm also using jack for convolution)
/# Send alsa API to jconvolver
pcm.rawjack {
type jack
playback_ports {
0 jconvolver:in.L
1 jconvolver:in.R
}
capture_ports {
0 system:Output_L
1 system:Output_R
}
}
# jackplug
pcm.jack {
type plug
slave { pcm "rawjack" }
hint {
description "JACK Audio Connection Kit"
}
}
# use following peripherical by defaut with alsa:
pcm.!default {
type plug
slave { pcm "rawjack" }
slave.channels 2
ttable.0.0 0.6
ttable.1.0 0.6
ttable.0.1 -0.6
ttable.1.1 -0.6
}
/
Do you think it is working the way I want ?
I have the feeling that although I get sound from both channels they aren't
out of phase.
Thank you for your comments/solution.
Best regards,
Jean
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10 Mar
10 Mar
1:05 p.m.
bricolodu wrote:
I want to deliver to my DAC two mono signals out of
phase.
ttable.0.0 0.6
ttable.1.0 0.6
ttable.0.1 -0.6
ttable.1.1 -0.6
This looks OK.
I have the feeling that although I get sound from both
channels they aren't
out of phase.
Does it sound different when you're using 0.6 everywhere?
Can you look at the output with an oscilloscope?
Regards,
Clemens
1:13 p.m.
On Thursday 10 March 2016, Clemens Ladisch wrote:
Or record with the input of
another sound card / computer and look at
it in e.g. Audacity?
Gerhard
I have the
feeling that although I get sound from both channels
they aren't out of phase.
Does it sound different when you're using 0.6 everywhere?
Can you look at the output with an oscilloscope? 
1:44 p.m.
On Thu, 10 Mar 2016 13:13:14 +0100, Gerhard Zintel wrote:
On Thursday 10 March 2016, Clemens Ladisch wrote:
Or simply play a sinus tone and mix the tone and the out of phase tone
to mono by a mixer or move two speakers face to face, one playing the
tone, the other the out of phase tone.
Can you look at the output with an oscilloscope?
Or record with the input of another sound card / computer and look at
it in e.g. Audacity?
3:20 p.m.
Hello,
I tried with a regular stereo system with two speakers very close together
and got bass, which seems wrong.
Then, i also tried on my project wher I use a TDA1543 as dac and the sound
was not good, like with an echo.
TDA1543 outputs sound to a Differential mono amplifier.
So for the time being I came back to my original setting with mono, one
channel output to one input of the TDA1543 and Single ended output to the
mono amplifier.
/# Send alsa API to jconvolver
pcm.rawjack {
type jack
playback_ports {
0 jconvolver:in.L
# 1 jconvolver:in.R
}
capture_ports {
0 system:Output_L
1 system:Output_R
}
}
# jackplug
pcm.jack {
type plug
slave { pcm "rawjack" }
hint {
description "JACK Audio Connection Kit"
}
}
# use following peripherical by defaut with alsa:
pcm.!default {
type plug
slave { pcm "rawjack" }
slave.channels 2
ttable.0.0 0.6
ttable.1.0 0.6
ttable.0.1 0
ttable.1.1 0
}
2016-03-10 12:48 GMT+01:00 Ralf Mardorf [via Linux Audio] <
ml-node+s4202n99278h43(a)n7.nabble.com>gt;:
On Thu, 10 Mar 2016 13:13:14 +0100, Gerhard Zintel
wrote:
--
Cordialement,
Jean
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View this message in context:
http://linux-audio.4202.n7.nabble.com/Inverse-Phase-in-ALSA-POSSIBLE-tp9927…
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On Thursday 10 March 2016, Clemens Ladisch wrote:
Or simply play a sinus tone and mix the tone and the out of phase tone
to mono by a mixer or move two speakers face to face, one playing the
tone, the other the out of phase tone.
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Can you look at the output with an oscilloscope?
Or record with the input of another sound card / computer and look at
it in e.g. Audacity?
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linux-audio-user@lists.linuxaudio.org
4 comments
4 participants
participants (4)
-
bricolodu -
Clemens Ladisch -
Gerhard Zintel -
Ralf Mardorf