{HEAD ~ An improved decoder} 17, wherein said {TAIL ~ reference frequency} is in the range of 250 Hz to 6 kHz 
wherein
{ HEAD ~ An improved decoder } 17 , wherein said { TAIL ~ reference frequency } is in the range of 250 Hz to 6 kHz
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH