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Filters in DSP subsystem

hi,

    I wanted to know about the two filters used in the C5505. First why FIR or IIR are used in a given sequence and is there a specific reason of using FIR for DC removal and IIR for multi band pass purpose??

   One thing more how can i get rid of noise completely cause my ECG signals are experiencing little noise on the waveforms. Should i isolate my setup or should i change the filters settings??

             Thanks.