A tone detector for detecting {TAIL ~ a tone} having a plurality of {HEAD ~ targeted frequencies}, comprising: 
A tone detector for detecting { TAIL ~ a tone } having a plurality of { HEAD ~ targeted frequencies } , comprising :
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH