I learned by reverse engineering DSP code in another platform which was used for obfuscation. I had a chat with a friend and he suggested the TI DSP starter kits. I'm not familiar with any of them, though.
>I learned by reverse engineering DSP code in another platform which was used for obfuscation
Whoa, I want to hear about this. I have a couple of DSP firmware images I've shied away from reverse engineering as I don't know the platforms.