A decoder output signal is provided, however, only if {HEAD ~ a second output signal} from {TAIL ~ the comparator} is provided within a predetermined period of time following the provision of the first output signal therefrom 
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A decoder output signal is provided , however , only if { HEAD ~ a second output signal } from { TAIL ~ the comparator } is provided within a predetermined period of time following the provision of the first output signal therefrom
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH