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