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I am want to apply a noise gate to my microphone. But I dont know why. I see that LADSPA Plugins can do that but i dont know how to set them up. If someone can help me with LADSPA or has a different application that I could use with PulseAudio, tell me. I need this, quick!

Elderzz
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  • For LADSPA usage with pulseaudio see: http://askubuntu.com/questions/43950/how-can-i-apply-a-ladspa-plugin-to-a-pulseaudio-stream - there is a gate in the SWH plugins, or from TAP Dynamics - it's a bit trial and error to find appropriate parameters. – Takkat Sep 30 '15 at 13:45
  • Every time I try to add this module, it says "Module load failed" I am using this code pacmd load-module module-ladspa-sink sink_name=ladspa_out master=alsa_output.pci-0000_00_1b.0.analog-stereo plugin=tap_dynamics_st label=tap_dynamics_st control=4,4,2,2 @Takkat – Elderzz Sep 30 '15 at 15:57
  • You missed some options, see my answer below. – Takkat Sep 30 '15 at 19:01

1 Answers1

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LADSPA-plugins to Pulse Audio

See this question on how to load and use LADSPA-plugins with pulseaudio:

TAP dynamics

For a compressor plugin we can use the TAP dynamics plugin from the tap-plugins Install tap-plugins.

The syntax for this plugin to load with pulseaudio is as follows:

pactl load-module module-ladspa-sink sink_name=LADSPA master=<sink-name> \
plugin=tap_dynamics_st label=tap_dynamics_st \
control=<attack>,<release>,<offset gain>,<makeup gain>,<stereo mode>,<function>

To get this plugin loaded we need to fill in all options above within the following possible range (from TAP documentation, also stored locally in usr/share/doc/tap-plugins/):

                   min.     default     max.
Attack (ms)         4        125        500
Release (ms)        4        502       1000
Offset Gain (dB)   -20        0          20
Makeup Gain (dB)   -20        0          20
Stereo Mode [2]     ?*        ?*         ?* *not documented well!
Function            0         0          14

The following function is selected by its number:

0 2:1 compressor at -6 dB
1 2:1 compressor at -9 dB
2 2:1 compressor at -12 dB
3 2:1 compressor at -18 dB
4 2.5:1 compressor at -12 dB
5 3:1 compressor at -12 dB
6 3:1 compressor at -15 dB
7 Compressor/Gate
8 Expander
9 Hard limiter at -6 dB
10 Hard limiter at -12 dB
11 Hard gate at -35 dB
12 Soft limiter
13 Soft knee compressor/gate
14 Soft gate below -36 dB

Apply to microphone source

To apply the LADSPA effect on a microphone source we can loopback the microphone input to this sink:

Using JACK sound server

For a more professional audio processing we may also consider running the JACK sound server where we can add plugins for LADSPA effects (e.g. jack-rack Install jack-rack).

Post-processing with Audacity

Post-processing of exisiting audio files or recordings can be done with Audacity Install audacity.

Community
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Takkat
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  • I used this solution that you sent. It loads, but how can I set it to take in the audio from the microhpone and make the ladspa like a "virtual" mic in the system that I could use for recording? Now no audio is going into ladspa plugin! – Elderzz Oct 01 '15 at 12:44
  • I can apply the filter to my google chrome stream(when I am watching a vid) and it has huge effects, but when applied to my mic, it doesnt have that effect at all! am i doing something wrong? – Elderzz Oct 01 '15 at 14:07
  • @Elderzz: actually the loopback device should work (at least it did for me). You could also try to assign a duplex profile to your sound card. – Takkat Oct 01 '15 at 14:35
  • How do I do that? @Takkat I also hear myself with the ladspa sink unmuted – Elderzz Oct 01 '15 at 14:37
  • @Elderzz: sorry for the delay (/me busy). I am a bit confused as to where your issue is at the moment. It is crucial to follow this sequence: 1. load the LADSPA module 2. switch to the LADSPA sink for output 3. load the loopback module. A duplex profile can be selected with pavucontrol configuration tab or via pactl set-card-profile <card> <profile>. – Takkat Oct 01 '15 at 18:06
  • I know @Takkat I did all of that, but how do i record the output of the sink? Also, it seems like the plugin has no effects to my mic audio. – Elderzz Oct 01 '15 at 18:15
  • It should have the same effect you hear when playing any other stream. To record the sink choose a name_of_sink.monitor as an input source for the recording application. Again, this choice can best be made with pavucontrol. It's not only you who finds this to be confusing and rather complicated. – Takkat Oct 01 '15 at 18:20
  • You may also play with a plugin effect that can't be overheard to get a grasp on the right settings (e.g. with the pitch shift I mentioned in my post I linked to above). – Takkat Oct 01 '15 at 18:24
  • I know the parameters and that but i dont know how to apply it to the mic! – Elderzz Oct 02 '15 at 17:20
  • @Elderzz: I see - no, unfortunately the LADSPA plugins can only be applied to a sink, not to a source. A so far not-yet-existent module-ladspa-source would be really nice to have ;-). That's why we have to loop-back the source to a sink to be able to apply LADSPA effects. – Takkat Oct 02 '15 at 18:14
  • Do you maybe know of a application that would help me do that? Maybe an app that adds plugins to ALSA or PulseAudio. – Elderzz Oct 02 '15 at 19:32
  • @Elderzz: for professional audio processing JACK as a sound server with effects plugins e.g. JACKRack may be a better (though harder) approach. JACK is the default sound server in Ubuntu Studio. – Takkat Oct 02 '15 at 20:28
  • I tried to setup jack, but I dont know how to use it cuz whenever i start a jack server, my pulseaudio is not working(I tried with a vid on youtube and it just stops doenst move anywhere) I cant find how to correctly set it up @Takkat – Elderzz Oct 03 '15 at 08:11
  • JACK is an entirely different sound server, and it is not easy to set up. See https://help.ubuntu.com/community/What%20is%20JACK for a start. – Takkat Oct 03 '15 at 08:20
  • I know how to setup jack, the only thing is the connections. in qjactl i dont see chrome, or skype or any of those... @Takkat – Elderzz Oct 03 '15 at 11:45
  • What is master=<sink-name> supposed to be? – qubodup Dec 13 '16 at 17:28
  • @qubodup <sink-name> is the name of the sink you wish the plugin to be applied to. See pactl list short sinks for sinks in your system. – Takkat Dec 13 '16 at 18:23