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