Something that lets me select a frequency above which all sounds would be filtered in real time? I don’t know if a software can separate the high pitched sounds from the rest of the sounds. If it was possible that would be perfect. If not just removing all sounds when any sound goes above the threshold.
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Pretty much any audio editing or production software will have it. Audacity is a common free one, and it has a high pass filter.
Audacity has some privacy and licensing concerns, so people forked it and made Tenacity
Just in case that is of concern to anyone
You could try EasyEffects (FKA PulseEffects)
The Equalizer plugin should work, but there may be a better one.
EasyEffects is just a wonderful piece of audio software (given that you’re using pipewwire as the audio backend). The filter plugin is probably the other notable option for this task.
I’m sure ffmpeg (command line software) can, tho idk exactly how
https://ffmpeg.org/ffmpeg-filters.html#lowpass
Or use sox.
It is not entirely clear what exactly you want, filter is just a common term in the audio scene… what to filter … remove frequencies or to reconstruct original sound. This is a difference.
If your goal is to lets say, filter frequency under 200 Hz to filter keyboard noise, equalizer APO would do, it is better than OBS Studio plugins because it uses a driver which works at lower latency without disorientation.