On Mon, Apr 16, 2007 at 08:49:19AM -0500, millward wrote: > I'm trying ot clean up a WAV file that has a low sounding rumble, motor-like > sound, sort of up and down. It's lower than the bass line. I'm finding this > hard to describe in words. Can you post a small sample somewhere? > I'm using the Gnome Wave Cleaner and its got > a notch filter but I don't know what frequency to set it for. I do know people > hear from about 20 Hz to 20,000 Hz, on a good day, so would maybe 50 Hz > to 100 Hz would be a good start? IF you're lucky, it might be that the rumble really is completely lower than the bassline. In that case, I'd try a very steep highpass filter first. Set it to just below the lowest fundamental in the bassline and see if that helps. If the bassline is from a bass guitar, low E fundamental is about 41 Hz and low B fundamental on a 5-string is about 31 Hz. (Handy chart here: http://en.wikipedia.org/wiki/Piano_key_frequencies). Typically most of the energy from a bass guitar is in the first few overtones, so you might also be able to apply some gradual rolloff of frequencies below about 80 Hz. -- Paul Winkler http://www.slinkp.com _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/mailman/listinfo.cgi/linux-audio-user
