公开(公告)号：US3634771A

公开(公告)日：1972-01-11

申请号：US3634771D

申请日：1970-09-22

Applicant: COMPTEURS COMP D

Inventor： HERMEL JACQUES EDMOND

IPC: G01R23/15 ,  G01R23/00 ,  H03D13/00

CPC classification number: G01R23/00

Abstract: Frequency-comparative circuit of two series of pulses comprising a two-output bistable rocker having two inputs respectively receiving said two series of pulses, a flip-flop connected to the outputs of said bistable rocker and having an auxiliary input connected to the output of a two-input delay circuit whose two inputs are themselves connected respectively to the two inputs of said bistable rocker and a two-input NAND circuit of which one input is connected to one of the outputs of said flip-flop and the other input to one of the inputs of said bistable rocker through a reversing circuit whereby one pulse of one of said two series of pulses prevents the passage of the next pulse from the other series thus causing at the output of said NAND circuit pulses corresponding in number to the difference between the number of pulses of said two pulse series.