When a direct current gain of one is desired, {HEAD ~ the first delayed signal output} from {TAIL ~ the first delay unit} 201 is transmitted to a reference delay unit 205 
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When a direct current gain of one is desired , { HEAD ~ the first delayed signal output } from { TAIL ~ the first delay unit } 201 is transmitted to a reference delay unit 205
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH