This invention generally relates to the field of communication systems, and, more particularly, to apparatus for decoding signals which are encoded by {HEAD ~ means} of {TAIL ~ one or more tones} of specified frequency 
This invention generally relates to the field of communication systems , and , more particularly , to apparatus for decoding signals which are encoded by { HEAD ~ means } of { TAIL ~ one or more tones } of specified frequency
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH