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it's an old trick to get rid of ambient noise. when i was working as a location sound recordist i knew of some colleagues who would put up a second mic and capture just the ambience of the room they were working in. later, by reversing the phase of that second track they could cancel out the background noise. it's the same idea as those "vocal eliminators" you could get at radio shack. since most recordings place the vocals in the center, this box would reverse the phase and recombine the audio and this would cause just the centered vocal to drop out - though there often was reverb and other effects that might still remain. instant kareoke. this technique works best when one has two sources with the same audio - otherwise there'd be nothing to cancel - so i'm not quite sure if it would be helpful in this situation. i think isolation is the key here. cheers bruce On Mar 9, 2005, at 10:07 AM, mike feeney wrote: > > What does inverting the phase accomplish? I guess I > don't understand what that means exactly. > > > --- Travis Hartnett <travishartnett@gmail.com> wrote: >> The mic goes into a preamp box, DI, or mixer which >> has a phase invert >> switch. Really. >> >> >> On Wed, 9 Mar 2005 09:26:18 -0500, tohall@rcn.com >> <tohall@rcn.com> wrote: >>> And how would one invert the phase? >>> Use two mics? >>> >>> Travis: >>>> >>>> A mic with high off-axis rejection, then invert >> the phase. >>>> >> >> > > > > > __________________________________ > Celebrate Yahoo!'s 10th Birthday! > Yahoo! Netrospective: 100 Moments of the Web > http://birthday.yahoo.com/netrospective/ > > > bruce tovsky www.skeletonhome.com