According to the invention, the undesired periodic noise is filtered out of the input signal during the digital signal processing , after {HEAD ~ the conversion} of {TAIL ~ the digital signal} into the frequency domain 
of
According to the invention , the undesired periodic noise is filtered out of the input signal during the digital signal processing , after { HEAD ~ the conversion } of { TAIL ~ the digital signal } into the frequency domain
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH