If the low complexity processor is selected, an output signal is generated using {HEAD ~ the low complexity processor}, and if the high complexity processor is selected, the output signal is generated using {TAIL ~ the high complexity processor} 
If the low complexity processor is selected , an output signal is generated using { HEAD ~ the low complexity processor } , and if the high complexity processor is selected , the output signal is generated using { TAIL ~ the high complexity processor }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL