{HEAD ~ The non linear section} is coupled in a feedback manner with {TAIL ~ the quantized linear section} 
is coupled with
{ HEAD ~ The non linear section } is coupled in a feedback manner with { TAIL ~ the quantized linear section }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL