Scientific & Academic Digital Audio Resources

biminiroad

Put your brainy stuff here. I'll start it out with this:

Filter resource:
http://www.cs.man.ac.uk/~barry/mydocs/courses/EE4192/

Phal_anx

here is some more stuff to read ;)
also contains z-1

https://web.eecs.umich.edu/~fessler/course/451/l/pdf/c8.pdf

RobertSyrett

http://till.com/articles/wavepalette/index.html

Waveforms and how they relate to harmonic content.

demcanulty

Here's a nice old-fashioned one from EMU about making digital filters sound 'analog':
http://quod.lib.umich.edu/cgi/p/pod/dod-idx/making-digital-filters-sound-analog.pdf?c=icmc;idno=bbp2372.1992.009

demcanulty

I've got a lot of stuff to brush up on (and properly learn) with these digital filter concepts. It's nice to look at straight up code, if you're more of a firmware person like myself. For completeness, I'll repost this that I posted in the other z-1 thread:
https://github.com/ddiakopoulos/MoogLadders
That xcode project compiled right away for me, which was a pleasant change. But the code itself is relatively straightforward. I was attracted to the musicDSP implementation for some reason, original link here:
http://www.musicdsp.org/showone.php?id=24

RobertSyrett

Nice! I love the Rossum Electro eurorack filters, I will have to give that one a thorough read.

biminiroad

Sound on Sound Synth Secrets! A must-read.

https://web.archive.org/web/20160403115835/http://www.soundonsound.com/sos/allsynthsecrets.htm

@afta8's tanh(x) resource:
http://folk.ntnu.no/oyvinbra/gdsp/Lesson4Modtanh.html

afta8

Since you ask for brainy stuff then this is worth a mention:
https://www.native-instruments.com/fileadmin/ni_media/downloads/pdf/VAFilterDesign_1.1.1.pdf

Pretty much the bible on modelling analogue filters... but also waaaay beyond my maths understanding

afta8

This entire blog is also a goldmine: http://www.earlevel.com/main/

biminiroad

https://www.attackmagazine.com/features/interview/roger-linn-swing-groove-magic-mpc-timing/

biminiroad

@afta8 that filter bible is fascinating - I think if we can build little components of it people can just drag and drop where they see particular symbols, since most of it is just block diagram stuff. I know @macromachines understands it, so I'll pick his brain for help. Also, note to other people: jump down to ladder and diode filter, those things will look a little more familiar than just looking at the equations.

biminiroad

PS: can someone have a look at that VAFilter design manual and tell me exactly what type of maths I'd have to learn to be able to comprehend the equations? And perhaps some learning resources for someone who just has basic trig down?

afta8

@biminiroad, good question about the type of maths, check this link out:
http://dsp.stackexchange.com/questions/26582/fields-of-math-needed-for-digital-filter-design/26583

I think also think this kind of stuff:
https://en.m.wikipedia.org/wiki/Z-transform

I have tried to self learn some of this but ended in frustration.. I think it would be easier to find a class or a tutor, that's what I hope to do, one day, some day!

biminiroad

nice thanks for the suggestions @afta8! bookmarked :) Well hopefully I can learn it enough where I can teach the basics to other people! That's the idea at least haha

afta8

Good luck with it, I would be interested in your learnings! Perhaps there's potential here for some kind of online study group?

Anyway another very useful link: http://www.willpirkle.com/app-notes/
Quite a few block diagrams in there which I have attempted to translate to Audulus with varying degrees of success..

biminiroad

@afta8 Rad - I just put out a Craigslist ad for a personal tutor so I can sit down with someone and really bang it out.

That link you just posted seems a lot more "human readable" than the other manual, lol! Thanks :)

plurgid

I've been trying to wrap my head around Wave Digital Filters as described here:

https://www.adsrsounds.com/reaktor-tutorials/wave-digital-filters-in-reaktor/
https://ccrma.stanford.edu/~jos/pasp/Wave_Digital_Filters_I.html
https://ccrma.stanford.edu/~dtyeh/papers/wdftutorial.pdf

math again, a little over my head ... need to get in on that tutoring session LOL :-)

diego898

Hey all! This is interesting indeed - this is actually how I learned about filters and signals in classes like Signals and Systems, Digital Signal Processing, etc. I am struggling to learn the stuff on here! One of my first posts asked about a frequency decomposition module, because thats I'm how used to thinking about manipulating a temporal signal!

As as math/materials for this, the MIT OCW has great courses on these topics - though they are very thorough and Im sure include material far beyond the scope of audio!

Phal_anx

i looked into MIT OCW there is alot of material about filters and many other cool stuff :)
but its way beyond my math knowledge... i never had this kind of math in school.. not even a little bit :D i m struggling alot in audulus with the exp node because of that... hahahaa ... but i love to play around with it :D

diego898

Just found this great resource!

http://dspillustrations.com/pages/index.html

And my favorite:

https://jackschaedler.github.io/circles-sines-signals/

biminiroad

@diego898 - whoa that's great!!! thanks for sharing :)

RobertSyrett

+1 for inforgraphics!

biminiroad · Screen Shot 2017-04-02 at 4.47.00 PM.png

RobertSyrett

demcanulty

Professor Roberge gives me the warm fuzzies! I haven't seen one of his videos in ages :)
Rest in peace, Jim, thanks for all the lessons!

http://news.mit.edu/2014/james-k-roberge-professor-of-electrical-engineering-dies-at-75

RobertSyrett

Awwww, transience in all things.

diego898

diego898

SansNom

Wow, didn't see this thread before, looks like there are some very useful links in there...

biminiroad

http://patches.zone/compression-guide

demcanulty

https://dood.al/oscilloscope/

This is surprisingly pleasing.

eall123

808 kick:

http://www.dafx14.fau.de/papers/dafx14_kurt_james_werner_a_physically_informed,_ci.pdf

eall123

808 cymbal:

http://quod.lib.umich.edu/cgi/p/pod/dod-idx/tr-808-cymbal-a-physically-informed-circuit-bendable-digital.pdf?c=icmc;idno=bbp2372.2014.221

eall123

808 cowbell:

https://www.academia.edu/7462829/More_Cowbell_a_Physically-Informed_Circuit-Bendable_Digital_Model_of_the_TR-808_Cowbell

eall123

Are there any 808 patches already made in Audulus?

RobertSyrett

Woah! so much 808 knowledge bombs, TY @eall123 !!!

biminiroad

@eall123 - the drums that come in Audulus that I made are all loosely based on the 808 as I read about it in the Sound on Sound Synth Secrets article - these articles you posted are MUCH more thorough and you'll probably get much better sounds out of them.

eall123

This Kurt James Werner guy made a demo:

https://soundcloud.com/kurt-james-werner/demo-of-tr-808-bass-drum

biminiroad

It sounds nice but what's with the clicking? I don't recall the original being that snappy

biminiroad

For anyone interested in making a strange attractor module

https://www.youtube.com/watch?time_continue=44&v=kbKtFN71Lfs

Joel_M_Peel

I can't believe someone else thought of this at the same time as me!

biminiroad

@Joel_M_Peel - did you see my other post about using a noisy ungrounded input as the random source? It would work better for true chaos than the internal random node.

http://forum.audulus.com/discussion/1352/analog-random-number-generator#Item_3

Joel_M_Peel

I got Audulus not too long ago, but do you think you could interface an Arduino temperature sensor as a random source? I was just thinking of how analog instruments, particularly older ones, detune due to temperature differentials, among other reasons.

biminiroad

@Joel_M_Peel - sure, as long as you could translate the temp sensor into an audio signal or a MIDI signal - however, there are easier ways to simulate analog detuning if that's all you're going for? You need true randomness to create a chaos module that would, every time you open it up and start the program, create a new motion. But you don't need to create true randomness to get pitch variations that sound truly random. Does that make sense?

Joel_M_Peel

Yes, of course. It's more for just the novelty of it! The modular market is exploding at such a rate that it takes time to develop a novel idea. A colleague and I who are getting our M. Eng. in Acoustics are trying to come up with some ideas. With the advent of cheap 3D printing and virtual circuit design like Autodesk Circuits, why not?!

biminiroad

@Joel_M_Peel - I'm excited for when we have MIDI out and can translate MIDI into XYZ position and use that to create a "visualizer" that is a 3d sculpture made from a 3d printer...have been kicking around that idea for a while

Joel_M_Peel

@biminirod - I'm sure that can be obtained with this product I stumbled upon the other day! https://owow.io/shop/

diego898

Interactive music making tutorial:

https://learningmusic.ableton.com/

RobertSyrett

stschoen

Good course on digital filter design: https://ccrma.stanford.edu/~jos/filters/. The math gets kind of heavy.

RobertSyrett

The part that I always fail at is how to convert the equations into audulus' visual language.

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