Quote:
Originally Posted by d_fu  Dan, I know - I was just referring to harmonics. People look at post-DA 5k "square" waves with an oscilloscope, complaining that at 44.1k sampling rate, the wave doesn't look square at all... 
Daniel |
My point is that they are NOT looking with a scope at the DA output. If they used a scope, they will see a clean 5KHz sine wave.
I do not think they are looking at the point where the DA conversion leads to the output filter, because the wave there is not too far from a clean 5KHz. Probing that point will show some steps, but most likely very small steps, and the higher the upsampling, the smaller the steps. But looking at the final DA output (after the analog filter will show a clean wave.
So what are they looking at? Probably some computer simulation of a DA without upsampling, and without an analog filter. But I already explained it in a previous post...
Regards
Dan Lavry