On 1/27/06, Peter Onion wrote: > > > > -----Original Message----- > > From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf > > Of Mark Rages > > > > Be warned, this will introduce phasing artifacts with most stereo > > material (a nasty smearing sound in the high frequencies). > > > > Can you explain this please ? > > I would have thought that unless the sound source was moving at the time of > the recording the phase relationship between the L and R signals would be > fixed and no "phasing artifacts" would be produced ? > > Unless you mean that at certain frequencies the fixed phase difference could > be 180deg and the signal would be cancelled in the result ? > > Peter > If you use two microphones are used to record the same sound, and they are at different distances from it, you create a comb filter: http://en.wikipedia.org/wiki/Comb_filter It's not hard to try this at home. The effect is pretty obvious, especially with processed pop music. You don't need to be a golden-ears audiophile to hear it. Regards, Mark markrages@gmail -- You think that it is a secret, but it never has been one. - fortune cookie -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist