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