{TAIL ~ A counting circuit} includes a digital counter for counting the pulses of an input signal during a counting interval and a pair of digital latches for latching {HEAD ~ the binary state} of the input signal at the beginning and end of the counting interval, respectively 
{ TAIL ~ A counting circuit } includes a digital counter for counting the pulses of an input signal during a counting interval and a pair of digital latches for latching { HEAD ~ the binary state } of the input signal at the beginning and end of the counting interval , respectively
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