{HEAD ~ A first stage} of {TAIL ~ the interpolation circuit} calculates 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 ~ A first stage } of { TAIL ~ the interpolation circuit } calculates 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
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