DSPs for guitar effects
in [DSP]
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From: chojny on 20 Oct 2006 03:18 Hello, I'm looking for best DSPs for guitar effects, especially delay/reverb (1-2s or even more delay). I can use C55x but I think that it could be too expensive. Maybe some dedicated DSPs with built-in algorithms could be better? I found: 1) Cirrus CS4811 but it's EOL 2) Alesis AL3201 but I get only 0,8s delay Any advice? Thanks for help. Chojny
From: Al Clark on 20 Oct 2006 07:49 chojny <chojnyWYTNIJJJJ(a)interia.pl> wrote in news:eh9t8e$7s8$1 @news.task.gda.pl: > Hello, > I'm looking for best DSPs for guitar effects, especially delay/reverb > (1-2s or even more delay). > I can use C55x but I think that it could be too expensive. Maybe some > dedicated DSPs with built-in algorithms could be better? I found: > 1) Cirrus CS4811 but it's EOL > 2) Alesis AL3201 but I get only 0,8s delay > > Any advice? > > Thanks for help. > Chojny > You may want to consider a low cost Blackfin. These parts have SDRAM controllers. You almost certainly will need external memory for the long delays you mention. You might also look at VisualAudio (a graphical tool from ADI). They have some reverb examples. -- Al Clark Danville Signal Processing, Inc. -------------------------------------------------------------------- Purveyors of Fine DSP Hardware and other Cool Stuff Available at http://www.danvillesignal.com
From: Vladimir Vassilevsky on 20 Oct 2006 10:31 chojny wrote: > Hello, > I'm looking for best DSPs for guitar effects, especially delay/reverb > (1-2s or even more delay). > I can use C55x but I think that it could be too expensive. Any DSP with that much of memory on the chip will be expensive. Using the external memory will be more economical. You will need the DSP with the external memory bus. Consider ADI BlackFIN or SHARC 21065. Vladimir Vassilevsky DSP and Mixed Signal Design Consultant http://www.abvolt.com
From: Robert Scott on 20 Oct 2006 11:48 On Fri, 20 Oct 2006 09:18:34 +0200, chojny <chojnyWYTNIJJJJ(a)interia.pl> wrote: >Hello, >I'm looking for best DSPs for guitar effects, especially delay/reverb >(1-2s or even more delay). Perhaps you don't need a DSP at all. Delay and reverb can be handled quite easily with primitive functions. About the only thing you might need is a fast fixed-point multiply. But there are a lot of micros that are not classified as DSP's that have fast multiply. As others have said, having access to large amounts of external RAM is much more relevant to your needs. Robert Scott Ypsilanti, Michigan
From: robert bristow-johnson on 20 Oct 2006 14:18 chojny wrote: > I'm looking for best DSPs for guitar effects, especially delay/reverb > (1-2s or even more delay). > I can use C55x but I think that it could be too expensive. Maybe some > dedicated DSPs with built-in algorithms could be better? I found: > 1) Cirrus CS4811 but it's EOL > 2) Alesis AL3201 but I get only 0,8s delay > > Any advice? are you looking for a part (the best part) to build something for a potential manufactured product or more on the hobbyist - onesies, twosies scale? if the latter, you should get a little dev board (along with the dev software), perhaps from TI (blech) or maybe more preferably one of the SHArC boards that Al's company can sell. they come all wired up with external memory (for more delay) and most have A/D and D/A on it or attached to it. you might have to build a little preamp, maybe not. > Thanks for help. FWIW. r b-j
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