The best performance you are going to get depends on your specific filter design. The lib_mic_array achieves very high FIR taps / instruction as each filter has been designed to achieve the best performance for the given situation. For example stage 1 of the mic_array converts PDM to PCM and decimat...

I recommend using the over-lap-and-add algorithm: https://en.wikipedia.org/wiki/Overlap%E2%80%93add_method Do you want to process mono or stereo? If it's stereo then and FFT can be used efficiently by packing one channel into the real inputs and the other channel into the imaginary inputs. after a d...

I didn't work out the exact number as that would require an almost full implementation. I figured out that the timing would be so tight (even at 125MIPS) that the engineering cost+risk would be too high.

Xcores are very good at precise timing, real time processing, parallel io, and deterministic io(amongst other things). If these are you requirements then yes.

Here is a good explanation of the DC offset filter used: http://www.embedded.com/design/configur ... DC-Removal

Eq 13-118 will give you the transfer function you require for adjusting the cut off. Hope that helps.

Is dc offset removal equivalent to high pass filtering. Yes

In order to ascertain if we should implement CAN FD I did some rough calculations. The xcore can execute instruction at 62.5MIPS, CAN can run at 1Mbaud. The hardest case to meet is where our CAN device is sending a message at the same time as another then loses arbitration and has to become a receiv...

there is a DC offset removal feature, you can vary its cut off with MIC_ARRAY_DC_OFFSET_LOG2

After a cursory study and instruction timing calculations it was decided that CAN FD is infeasible on an xcore. No corner cases were ever investigated nor was any code written. The corner cases are dealing with the worse case clock drift after long runs of zeros and ones (the 11th bit as 5 zeros + 5...

You need to tell the application to use your new filters. i.e. design a third stage decimator of your own specification then use it within your application.