Hi Tanu,
Am 29.02.2016 um 15:13 schrieb Tanu Kaskinen:
On Mon, 2016-02-29 at 14:23 +0100, Klaus Jaensch wrote:
Hello,
we use USB audio devices (e.g. M-Audio Fast Track and Focusrite Scarlett
2i2) to record mono speech on Ubuntu.
We face the problem that for mono recordings both input channels of the
devices are mixed together. But we want to record only the left channel,
not the mix. The left channel gets only half of the dynamic range; the
signal amplitude does not exceed -6dB.
Is there a way to configure PulseAudio accordingly?
If the recording program allows, you can specify its channel map to be
"left" instead of "mono". For example, parecord supports the --channel-
map option.
If the recording program forces you to use "mono" channel map, you can
use module-remap-source:
pactl load-module module-remap-source sink_name=mono_source master=...
channel_map=mono master_channel_map=left remix=no
The "master" argument is the source name of the usb sound card. You can
find the name with "pactl list sources". Once the remap source is
loaded, you can point the recording program to "mono_source".
thanks, that works fine!
I need it system-wide for all users, therefore I put these lines:
load-module module-remap-source source_name=mono_source
master=alsa_input.usb-M-Audio_Fast_Track-00-Track.iec958-stereo
channel_map=mono master_channel_map=left remix=no
set-default-source mono_source
to /etc/pulse/default.pa
I'm wondering why it is the default to mix the channels. I think mixing
should be done by the applications, not by the audio system.
Klaus
--
Tanu
--
------------------------------------------
Klaus Jaensch
Muenchen
Germany
Institut fuer Phonetik und Sprachverarbeitung
Schellingstr.3/II
Room 223 VG
80799 München
Phone (Work): +49-(0)89-2180-2806
Fax: +49-(0)89-2180-5790
EMail: [email protected]
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