{HEAD ~ A first stage} of the interpolation circuit calculates {TAIL ~ a one half amplitude value}; a second stage calculates one fourth and three fourths amplitude values, and a third stage calculates one eighth, three eighths, five eighths, and seven eighths amplitude values 
calculates
{ HEAD ~ A first stage } of the interpolation circuit calculates { TAIL ~ a one half amplitude value } ; a second stage calculates one fourth and three fourths amplitude values , and a third stage calculates one eighth , three eighths , five eighths , and seven eighths amplitude values
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH