digitalsignalprocessing-epfl Here is another interesting eLearning for DIY audio enthusiasts. Digital signal processing from the École Polytechnique Fédérale de Lausanne. With this course you will understand the basics of digital signal processing. The course does not focus explicitly on audio applications. But it might still help you to understand, what’s going on in an audio DSP and also what their restrictions are.
There is another goodie: the textbook for this course is available online for free. You can buy a printed version or the iBook version, but if you’re ok with a PDF file, you don’t have to pay for it. I just had a look at the textbook and it seems to be well-written.
However there is one thing, that some people may not like: There is a lot of complex algebra in digital signal processing. You will not just learn ready-to-use algorithms, but you have to do some algebra by yourself. If you hate math, you will not like this course.

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