The present invention provides a tone detector and {HEAD ~ a method} for detecting {TAIL ~ a multi frequency tone} as described in the accompanying claims 
for detecting
The present invention provides a tone detector and { HEAD ~ a method } for detecting { TAIL ~ a multi frequency tone } as described in the accompanying claims
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH