Digital audio signals and how they really behave [video]
Really interesting and well presented.As a layperson there were a couple of things I didn't quite get.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?Isn't there also an argument that frequencies above 19khz can be heard by some people so need to be accurately represented?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.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.Just holes in my understanding really - credit to this video though, it's forced me to actually have to think about this :)