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That was a fantastic link! Many people seem to agree https://news.ycombinator.com/item?id=9131706. Thanks.

I'd be interested to see if the OP is more math oriented than Circles, Sines, and Signals. CSS admits it's pretty strictly conceptual, and didn't give a ton of resources on getting a more mathematical foundation of the DSP principles explained.

Hiya, I posted my main website elsewhere in this thread, but this link in particular:

http://diydsp.com/livesite/pages/home#DSP_Theory

contains links to documents Gilbert Strange and Rick Lyons. These two are much more math-intensive than many of the other introductions.

And if you want to go whole hog, check out the free online lectures:

http://diydsp.com/livesite/pages/home#Free_Online_Lectures

Might want to add the textbooks available at http://www.fourierandwavelets.org/.

I really like the first, "Foundations of Signal Processing", as a linear algebra centered treatment of the topic.

Hey, this is great! Thanks for showing me this!

The layout, the animated figures, the text. Gorgeous.