The server 14, wherein the processor is operative to perform {HEAD ~ a fast Fourier transform operation} on {TAIL ~ the raw signal data} 
The server 14 , wherein the processor is operative to perform { HEAD ~ a fast Fourier transform operation } on { TAIL ~ the raw signal data }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL