A hearing aid apparatus employs a single side band modulator which serves to convert {HEAD ~ an audio band} of frequencies into {TAIL ~ an upper and lower side band signal} 
into
A hearing aid apparatus employs a single side band modulator which serves to convert { HEAD ~ an audio band } of frequencies into { TAIL ~ an upper and lower side band signal }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL