The latest version of SDR# has now been updated to include a noise blanker plugin. A noise blanker can reduce impulsive noises like those created by spark gaps and electric motors. Other SDR programs like Linrad and HDSDR have had noise blanker functions for a while so this is a welcome addition to SDR#. Below is a comparison of the noise blanker turned on and off on a noisy CW signal.
To update SDR# to the latest version simply run install.bat again. Take note that updating will remove any plugins you have added to the SDRSharp.exe.Config file so you may wish to save it first.
Noise Blanker Off[audio https://www.rtl-sdr.com/wp-content/uploads/2014/03/nb_off.mp3]
Noise Blanker On[audio https://www.rtl-sdr.com/wp-content/uploads/2014/03/nb_on.mp3]