Phil Leigh;348555 Wrote: > Nick - the same thought occurred to me...so a low level 50Hz sine wave > mixed in would reduce the Gibbs phenomenon in the manner that can > clearly be seen? > > Seems reasonable - as the sine and square waves mix , the Gibbs > phenomena rises and falls...in a sinusoidal manner! > > Presumably as the mains 50Hz wave hits the zero-crossing point the > Gibbs phenomena is fully exposed?
Hard to tell but mostly 100 Hz comes from the 50 Hz more directly, like when AC mains gets rectified. So, every non-switching PSU needs to deal with a 100Hz ripple or 120 Hz when input is 60 Hz. After rectification, the negative halves of the sinus are inverted to positive, so the signal never goes below zero. This doubles the frequency of the signal. A light bulb flashes on & off at 100/120 Hz too because it'll burn on the negative part of the sine too. EM-wise Light bulbs are quite clean but TL is dirty. cheers, Nick. -- DeVerm ------------------------------------------------------------------------ DeVerm's Profile: http://forums.slimdevices.com/member.php?userid=18104 View this thread: http://forums.slimdevices.com/showthread.php?t=53345 _______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
