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pulseaudio - Create a real-time audio filter for Alsa ...
https://stackoverflow.com/questions/50539766/create-a-real-time-audio-filter-for-alsa-pulse-loopback
1) I recommend doing this in Pulseaudio; redirecting ALSA output through your filter will be more difficult. 2) There are already modules like module-ladspa-sink for Pulseaudio, details e.g. here.The module forwards LADSPA processed sound to master, but as you need both the mic input and the computer sound output, you may have to use some other modules (e.g. …
How to add a low-pass filter to a system-wide PulseAudio ...
https://askubuntu.com/questions/869822/how-to-add-a-low-pass-filter-to-a-system-wide-pulseaudio-profile
Now if you want all applications to use the filter sink by default you need to inform PulseAudio like this: set-default-sink <NAME> where <NAME> is the same as in the previous section. PulseAudio stores the last sink of each application using it and may use that in favour of the new default. To reset those remove ~/.pulse/*-stream-volumes.tdb.
Using PulseAudio to apply low-pass filter on microphone ...
https://dockerquestions.com/2021/10/01/using-pulseaudio-to-apply-low-pass-filter-on-microphone/
what are the necessary settings for PulseAudio to apply a low-pass filter on my microphone input for frequencies under 3000 Hz? Currently I’m trying to remove or weaken frequencies above 3000 Hz in real-time from my microphone input inside a docker container running Ubuntu.
PulseAudio/Examples - ArchWiki
https://wiki.archlinux.org/title/PulseAudio/Examples
$ pactl load-module module-loopback source=input_source sink=output_source. This command will print the module's ID so that you can stop the piping later like this: $ pactl unload-module id. If you lose the ID, you can obtain it from pactl list modules short. PulseAudio as a minimal unintrusive dumb pipe to ALSA
Automatic volume normalization with PulseAudio
https://flaterco.com/kb/audio/pulse/volume.html
1. Install LADSPA filter. PulseAudio supports only LADSPA filters. Non-support of libavfilter is a serious disappointment, but for this simple task, a sufficient LADSPA filter is gettable (almost). I used the "Fast Lookahead limiter" from Steve Harris, but with the following modification to allow greater compression:
PulseAudio under the hood - Victor Gaydov
https://gavv.github.io/articles/pulseaudio-under-the-hood/
PulseAudio treats filter devices specially in several cases: thread sharing. Unlike regular sources and sinks, filter sources and sinks don’t have a dedicated thread. They are running inside the thread of the master source or sink. volume sharing. The filter source or sink always uses the same volume as its master source or sink. autoloading
sound - Realtime noise-removal with PulseAudio? - Ask …
https://askubuntu.com/questions/18958/realtime-noise-removal-with-pulseaudio
Reload PulseAudio (pulseaudio -k) or simply restart the computer. You should be able to select the new Noise Cancellation option from the Input Device Section: You can find more information about it on the Echo Cancel Module Page. Set input as default. If you wish to set as default the echo cancel device simply turn the above line into:
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