An encoder converts the digital data into audio tones that synthesize {HEAD ~ frequency characteristics} of {TAIL ~ human speech} 
of
An encoder converts the digital data into audio tones that synthesize { HEAD ~ frequency characteristics } of { TAIL ~ human speech }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL