Searching the driver source itself, it's not explicitly mentioned either. Searching through the kernel source documentation, 'noise suppression' or 'echo cancellation' is not mentioned in relation to these devices. 1 It appears to me that normally, Realtek PCI sound cards actually use the Intel HDA driver with a patch to support the ALC codecs (for anyone who's interested: /sound/pci/hda/patch_realtek.c).

If this is a feature of the device and not just the software it came with (it's probably the former), then it has to be implemented in the kernel driver.

This is also crossposted on Ask Ubuntu which in turn was already answered here. I know I could buy better soundcard and microphone, but as I said, Windows Realtek drivers remove the noise on software level in real time (ie no noise when talking on TeamSpeak3/Steam/whatever voip programme) so I hope that there is such option on Linux as well. I can't find solution for it and this is the only thing that prevents me from switching to Linux completely - as I talk using microphone a lot and on Windows the Realtek software removes the background noise completely and PulseAudio doesn't remove it, which means the recorded voice on Linux is very bad. My question is how can I enable background noise suppression in ALSA/PulseAudio? Is there any module I can install or maybe there is a setting for it that can be enabled in config file? However, Windows Realtek drivers have noise suppression option which works (after enabling it, Audacity shows no background noise and my ears also confirm that there is no background noise).

On both Windows and Linux, when I enable microphone boost +30db (required because my microphone is quiet), I get very annoying and loud background noise (I also confirmed the background noise with Audacity on both systems).

On Windows 7 I use official Realtek drivers, on Linux I use PulseAudio (on Ubuntu 13.10).

Remove background static microphone