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