LMS or RLS adaptive filter - possible?

The SigmaDSP does not have a feedback method to adapt its filter coefficients on the fly on its own. If you need to do adaptive filtering, then you would need a microcontroller to do the decisions and coefficient calculation on-the-fly.

The LMS or RLS adaption calculations are very mips intensive and could not be offloaded to a microcontroller unless the design has a low sample rate. But then you might not need a dsp at all if the sample rate is low. The application I am looking at, a type of echo canceller, is running at 48Ksample 2 channel and does not have or otherwise need an external microcontroller. The canceller function could be placed after a decimation filter to reduce the mips and memory requirement but SigmaStudio does not support multirate either, so for now the SigmaDSP looks like a dead end for this application.

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Thank you,
EZ Admin