F-X domain denoise

This compares amplitudes at each frequency and kills those which are much greater than neighbours in the window. The user specifies the window size and frequency range and a threshold. It may be known as time-frequency denoise or similar names eleswhere. Usually used for attacking swell noise in marine data. It can also be used for 50/60 Hz pickup on land data, with less damage than a notch filter. The images will open in a new tab/window. Opening in a new tab is better.

FXDNOISE marine input
FXDNOISE difference