If it where not it would not work you would not get =20kHz upper limit the fact that a DAC reproduce 20k from a 44.1 sampled signal proves that it is actually working closely enough to Nyquist and likewise if an ADC samples with 44.1k and still gets 20k it is working ? ( the theoretical fs/2 would be 22.05kHz )
Most DAC's in test also produces textbook impulse response graphs and have no more distortion and intermodulation etc close to 20kHz than they have anywhere else , there are exceptions my crappy PC soundcard or probably pulse audio re-sampling etc (ubuntu) produce clear intermodulation products . So when it's not working it's very evident it just fails and you have imaging/aliasing all over the place , when I get home I could produce links to interesting intermodulation test tones for DAC's these are very close to fs so if your dac have problems close to fs you will hear it :) These tones are on 44.1 base and 48kHz base respectively Also the crude visual examples in the article , where a handful of sinc functions get you pretty close to real reconstruction , where in reality practical gear have much higher precision . The infinite is a red herring in this case , if it where huge problems with practical implementations it would be very evident. Practical gear is close enough http://forums.slimdevices.com/showthread.php?p=694461#post694461 -- Mnyb -------------------------------------------------------------------- Main hifi: Touch + CIA PS +MeridianG68J MeridianHD621 MeridianG98DH 2 x MeridianDSP5200 MeridianDSP5200HC 2 xMeridianDSP3100 +Rel Stadium 3 sub. Bedroom/Office: Boom Kitchen: Touch + powered Fostex PM0.4 Misc use: Radio (with battery) iPad1 with iPengHD & SqueezePad (in storage SB3, reciever ,controller ) http://people.xiph.org/~xiphmont/demo/neil-young.html ------------------------------------------------------------------------ Mnyb's Profile: http://forums.slimdevices.com/member.php?userid=4143 View this thread: http://forums.slimdevices.com/showthread.php?t=93990 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/audiophiles
