Hi there, really appreciate your VA book. I am reading version 2.1.0 and I think I spotted an error: on page 93, the text goes:
"In this respect consider that Fig. 3.12 is trying to explicitly emulate the analog integration behavior, preserving the topology of the original analog structure, while Fig. 3.34 is concerned solely with implementing a correct transfer function. Since Fig. 3.34 implements a classical approach to the bilinear transform application for digital filter design (which ignores the filter topology) we’ll refer to the trapezoidal integration replacement technique as the topology-preserving bilinear transform (or, shortly, TPBLT)." I *think* that it should be "Since Fig. 3.12 implements ..." instead of 3.34. Am I right? If I am not, then I guess I did not understand much about TPT :) PS: any chance there could be a permalink to the most recent version of the book? I seem that I have to go back through the archives of music-dsp to find the most recent link (or manually attempt a URL for version 2.1.1). Also, is the book linked to from anywhere on the NI website? Thanks, Giulio On Thursday, 1 November 2018, 08:26:35 GMT, Vadim Zavalishin <vadim.zavalis...@native-instruments.de> wrote: On 31-Oct-18 18:19, Stefan Stenzel wrote: > Vadim, > > I was more refering to the analog multimode filter based on the moog cascade > I did some years ago, and found it amusing to find a warning against it. Ah, you mean the one at the beginning of Section 5.5? Well, that's an artifact of the older revision 1, where the ladder filter was introduced before the SVF (I still believe it's better didactically, unfortunately new material dependencies made me switch the order). The modal mixtures of the transistor ladder are asymmetric (HP is not symmetric to LP and has the resonance peak kind of "in the middle of its slope" and BP is not symmetric on its own). I felt that it might be confusing for a beginner if their first encounter with resonating HP and BP is with this kind of special-looking filters, hence the warning. With revision 2 this warning becomes less important, since the 2-pole LP and BP were discussed already before, but I still believe it's informative. After all, it doesn't say that these filters are bad, it says that they are special ;) > > Anyway, excellent writeup, Thank you! I'm glad my book is appreciated not only by newbies, but also by the industry experts. > I wish I cuold have it printed as a proper book for more relaxed reading. Hmmm, 500 A4 pages would be rather heavy ;) Vadim -- Vadim Zavalishin Reaktor Application Architect Native Instruments GmbH +49-30-611035-0 www.native-instruments.com _______________________________________________ dupswapdrop: music-dsp mailing list music-dsp@music.columbia.edu https://lists.columbia.edu/mailman/listinfo/music-dsp _______________________________________________ dupswapdrop: music-dsp mailing list music-dsp@music.columbia.edu https://lists.columbia.edu/mailman/listinfo/music-dsp
