{TAIL ~ a first filter bank} receiving {HEAD ~ an input signal} and providing frequency estimates for an initial indication of a presence of each of said targeted frequencies 
{ TAIL ~ a first filter bank } receiving { HEAD ~ an input signal } and providing frequency estimates for an initial indication of a presence of each of said targeted frequencies
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH