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compact rio Real time signal processing Jitter

i'm conducing active noise control with 5 microphone and 5 speaker. 

control algorithm wroted in RT not FPGA because the algorithm complicate

then i didn't make window monitor VI just watch outcome of signal processing in RT 

i'am running RT with sampling rate 1600Hz dt = 0.000625 but there is some Jitter from dt =  0.00061x to 0.00067x

 

my question is 

1. the Jitter that i experience is normal? 

2. Explicit Conversion in RT have influence on Jitter?

3. Is FPGA RT  better than DSP chip in signal processing? i think if i rise sampling rate in RT, the jitter is large. same thing happen in DSP microcontroller? 

 

 

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