Digital audio signals and how they really behave [video]
Really interesting and well presented.<p>As a layperson there were a couple of things I didn't quite get.<p>I don't 100% get the band limited signal bit. How does band limiting imply that there's only a single possible reconstruction of the digital signal? I can kind of picture the fourier transform meaning that there's only one representation but it's a bit of a leap for me. Can the converter itself not create the signal incorrectly?<p>Isn't there also an argument that frequencies above 19khz can be heard by some people so need to be accurately represented?<p>I also don't understand how you can necessarily say that because it's ok for a sine wave, it's ok for all waves. with the square wave, the output is a sort of digital approximation right? Presumably that's a perceptible difference from the original analogue version? This video was focusing on differences in digital processing so maybe that's just not relevant to the discussion.<p>Would be interesting to see a complex analogue signal being fed through the digital pipeline and then inverted against the original to see the differences. Again, maybe that's a known difference and not really part of the argument here.<p>Just holes in my understanding really - credit to this video though, it's forced me to actually have to think about this :)