Hi all,
Again, maybe playing th unpaid professor a bit too much (but that IMO is better than the opposite), remember the relevant theories when dealing with ANY dsp subject:
*) The "real" signal is only known at the sample times (assuming correctly sampled data) and to get information about the times in between the samples the *only* correct filter is a lengthy (possibly up to seconds (no typo)) sinc (sine cardinal: sinx/x) based filter, and there are no exceptions to that rule.
*) No other filter of combination of interpolators is going to at some point do a correct alternative job, except for certain cases
*) In normal music/speech the boundaries of those exceptions can mostly easily be found
*) Also FFT-based methods are *NOT* going to set you free from the correct sample reconstruction theory, so there *are* going to be errors if you limit yourself to it and presume you accurately know the actual signal, especially in the high frequency range
Specifically: you can't use either FFT or loop detection based theory/software to the extend of escaping a *lot* of error sources. Not possible. Only approximations, and I had the impression some people wanted a discussion about that, well for those new cludges of combined techniques not doing justice to the main mathematical theoretical limitations aren't going to help, regardless of expensive or suggestive names on article author lists.
I'll make an example this week of other types of problems with ALL the analysis forms I've recently read about.
I was recently at a AES(nl) lecture where it wasn't so bad, but it seems to me the questions of certain people in DSP related programming are often not directed at interesting science or decent engineering, or (very important) OpenSource or not hobby-ing with good subjects, but more at depriving certain good people of their lives and at finding sufficiently many and/or deep lies to continue with their living together (...).
And considering my grades and the numerous english (European) and American (us English) people I've talked and interacted with off and on the internet, I don't think at least that *I* feel that's a language barrier.
Theo Verelst http://www.theover.org/Synth -- dupswapdrop -- the music-dsp mailing list and website: subscription info, FAQ, source code archive, list archive, book reviews, dsp links http://music.columbia.edu/cmc/music-dsp http://music.columbia.edu/mailman/listinfo/music-dsp
