Hi all

Here it is: The Art of VA Filter Design. It is based around the TPT (a.k.a. zero-delay feedback) filter design method. No preliminary filter design knowledge required.

The full list of download links:
http://ay-kedi.narod2.ru/VAFilterDesign.pdf (rev 1.0.3, primary site)
http://www.discodsp.net/VAFilterDesign.pdf (rev 1.0.3, thanks to george for mirroring)
http://www.discodsp.net/VAFilterDesignA5.pdf (rev 1.0.3, A5 format)
http://www.native-instruments.com/fileadmin/ni_media/downloa ds/pdf/VAFilterDesign_1.0.3.pdf (rev 1.0.3, NI website)
http://www.native-instruments.com/fileadmin/ni_media/downloa ds/pdf/VAFilterDesign_1.0.3_A5.pdf (rev 1.0.3 in A5 format, NI website)

The book has been actually written in the last week of April, but there were some unforseen delays getting it published. In the meantime I replaced the originally used DF2 integrators with TDF2 integrators (thanks to mystran ). It's remarkable how at the very same time the same topic got extensively discussed on KVR

The book text hasn't been extensively proofread, so if you spot any mistakes, the feedback is welcome. Equally, I would appreciate the mirroring of the file, in which case please drop me a note, so that I can inform you of the updates.

The main file is in A4 format. There is now also a "quick-and-dirty" A5 version, which should be better readable on e-book reader devices.

I have also been recently thinking about the Acknowledgements section of the book. While I have acknowledged everything which I consciously used in the book's writing, there's at least one uncovered area: acknowledgments of the pioneering works, even though not explicitly used during the book's writing. E.g. the book describes, among other things, Antti's ladder filter model, IIRC the diode ladder filter model has been described in some DAFX article etc. But then, even the lowpass RC filter must have had some inventor, and as such should deserve the acknowledgement as well. So I'm a little bit unsure how to address this issue and would appreciate the advice of the community.

Enjoy!

Regards,
Vadim
Last edited by Z1202 on Fri Apr 26, 2013 9:05 am; edited 9 times in total

Your diode approach is interesting.

Specifically what I mean the signal flow graph of Figure 4.13; I never thought about it that way, even if I've written a derivation for the analog model here at some point (and at that point I remember noting that "this gives the same results as Stinchcombe" so it's not like I was the first one).

Your linear solution looks pretty much exactly as awful as mine.

Anyway, lots of useful content in there. Certainly explained very well and at least for me it looks like it should be reasonable easy to understand.

Oh, don't thank me. Thank neotec whose idea it was. I just stole it from him.

But it was you who drew my attention to that subject. Probably I should credit neotec too (do you happen to know his actual name?)

As requested I have mirrored the PDF at http://www.discodsp.net/VAFilterDesign.pdf

are you saying that there is even a small chance that i might understand something if i attempt to read this?

then nope..

No, I was wondering about it in "my own" thread.

From quickly glancing through the text, I don't think that's as bad as it sounds. He explains everything he does quite clearly. So I think there's a chance that anyone that can write code can probably figure it out. In fact, it looks like it's easier to read than most books on traditional digital filters.

Just in case you didn't know,Complex Algebra doesn't mean "really really hard" Algebra,it just means Algebra with complex numbers which isn't that hard if i recall correctly (been a few years since i read it). I've yet to discover what you use it for and what it got to do with audio but i'm sure someone will tell me.

Looks very cool - many thanks for sharing! When did you have the time to write all this

NICE BOOK!

Thanks for adding this to the body of DSP literature!!!!

Hey Annto, I agree. Personally I've learn't more about filters by practical examples and comments by mystran and neotec and andy_fx, than I did reading that pdf. That being said though; I'm glad I read it - because the 30% that I understood was quite enlighting. Just looking at that diode-ladder block diagram makes me



That I fully agree with.

Regards
Andrew

i looked at it
once again i realize that my brain is just incompatible with such matters
there are things i understand, and things i don't (like math)

oh well.. maybe after ~20 years.. naah