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