opaqueice;348634 Wrote: > You can't encode a clean squarewave in 44.1 KHz format - it's > impossible. You either have Gibbs ringing or a more rounded waveform. > In that trace it looks like you have both. Basically, the problem is > the corners. To make a sharp corner one needs infinite frequency > (since the derivative of the signal changes infinitely fast).
Actually you can - or at least you can get very very close to perfect. The only problem is that it takes at least one sample to rise from zero to the top of the mark and to fall to the bottom of the space...so not quite perfect but pretty darn close. The ringing, overshoot etc only appear when the (nearly) mathematically perfect WAV file is sent through a DAC and hits the analogue filters. Here is the picture from my scope... this is the analogue output from my DAC using a 1Khz "perfect" squarewave mathematically generated in Audacity 1.3 +-------------------------------------------------------------------+ |Filename: True 1kHz Square Wave.jpg | |Download: http://forums.slimdevices.com/attachment.php?attachmentid=6006| +-------------------------------------------------------------------+ -- Phil Leigh You want to see the signal path BEFORE it gets onto a CD/vinyl...it ain't what you'd call minimal...SB3+Stontronics PSU - Altmann JISCO/UPCI - TACT RCS 2.2X + Good Vibrations S/W - MF Triplethreat(Audiocom full mods)- Linn 5103 - Aktiv 5.1 system (6x LK140's, ESPEK/TRIKAN/KATAN/SEIZMIK 10.5), Townsend Supertweeters, Kimber & Chord cables Outdoors: Boombox+Creative Sub (If I remember to turn it on...) ------------------------------------------------------------------------ Phil Leigh's Profile: http://forums.slimdevices.com/member.php?userid=85 View this thread: http://forums.slimdevices.com/showthread.php?t=53345 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/audiophiles
