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