Hi all. Another year, another EE project. I always seem to levitate towards projects that involve audio since audio it is a hobby of mine. =)
So, I've been thinking of creating a servo controlled subwoofer. Implementation of the feedback circuit is presumably going to be done via a 16bit integer based motorola DSP (don't remember which off the top of my head). I was wondering if any of you digital guys and gals had papers, articles, or anything related to the theory behind servo controlled stuff (doesn't have to be about subs for the related theory to become apparent) done in the digital domain, meaning no differential amps, analog circuits, or the like. Google is usually my friend but all I can seem to come up with is servo controlled sub advertisements. I will continue looking as well as updating the post with progress and eventually code and circuit layouts for the final project (if it so turns out well).
Last year I made an automated equalization unit like the behringer DEQ2496's autoeq feature on the same DSP. Suffice it to say it was a major PITA b/c of the very limited precision the 16bit int platform but by george it worked and earned me a nice grade. It did get a little noisy after heavy equalization b/c of quantization errors but it was the best that could be done with limited equipment. Oh yeah, I might also be able to land my hands on a more powerful 32bit fp DSP is I dig around a bit and ask nicely.
So, I've been thinking of creating a servo controlled subwoofer. Implementation of the feedback circuit is presumably going to be done via a 16bit integer based motorola DSP (don't remember which off the top of my head). I was wondering if any of you digital guys and gals had papers, articles, or anything related to the theory behind servo controlled stuff (doesn't have to be about subs for the related theory to become apparent) done in the digital domain, meaning no differential amps, analog circuits, or the like. Google is usually my friend but all I can seem to come up with is servo controlled sub advertisements. I will continue looking as well as updating the post with progress and eventually code and circuit layouts for the final project (if it so turns out well).
Last year I made an automated equalization unit like the behringer DEQ2496's autoeq feature on the same DSP. Suffice it to say it was a major PITA b/c of the very limited precision the 16bit int platform but by george it worked and earned me a nice grade. It did get a little noisy after heavy equalization b/c of quantization errors but it was the best that could be done with limited equipment. Oh yeah, I might also be able to land my hands on a more powerful 32bit fp DSP is I dig around a bit and ask nicely.