Mudcat Café Message

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User Name	Thread Name	Subject	Posted
Mitch the Bass	Tech: Removing 60 CPS Hum (30)	RE: Tech: Removing 60 CPS Hum	08 Nov 10
Whilst agreeing with the comments about harmonics of 60Hz being present, you may get acceptable results just filtering out the 60Hz with a notch filter or a High Pass Filter. A noise filter is meant for getting rid of hiss etc. not specific frequencies. Unfortunately the lowest note on a 4-string bass guitar is 41.2 Hz (not 80 as suggested above) so you may lose notes around B(61.74Hz). Audacity has an FFT filter and a High Pass Filter which may be sufficient but it also has a "Nyquist Prompt" which you can program to remove specific frequencies or you can download a notch filter plugin at http://audacity.sourceforge.net/nyquist/notch.zip. Mitch

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