Phil Leigh Wrote: > but a change in level wouldn't equate to a change in pitch...
I think a change in the bass level, with all else fixed, might explain what I heard. I described it as a pitch change, but it was really far from a pure tone. > > and the "beating" can be phase-sensitive in so far as the > intermodulated sound changes - this is the basis of many guitar effects > such as quasi-flanging, quasi vibrato etc...I say "quasi" because these > effects are actually phase changing/modulation but give rise to > apparent pitch modulations when the phase-shifted and normal sounds are > mixed. > > To test this, I tried flipping the phase switch on my guitar whilst > tuning up/down to an audible fixed (440Hz) tone - this time there is a > definite change in the sound in the beat patterns. If I take the fixed > tone away, the phase (polarity) switch has no audible effect... That confuses me... if you play two pure tones of different frequency f1 and f2 together, the relative phase will scan across all values at a rate determined by the difference in frequencies of the two tones - so you hear beating at frequency |f1 - f2|. So I guess switching the polarity of one tone should shift the phase of the beating, which could be audible if the two tones were close together in frequency to begin with. Could that be what you heard? But I don't think it could explain what I heard. Still, I'll try another frequency later when I get a chance. -- opaqueice ------------------------------------------------------------------------ opaqueice's Profile: http://forums.slimdevices.com/member.php?userid=4234 View this thread: http://forums.slimdevices.com/showthread.php?t=23759 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/audiophiles
