PULSE TRAIN SEPARATINGGDETECTING CIRCUIT

摘要

PURPOSE:To make it rapid and secure to separate the pulse train of each system by performing the processing by providing a delay switching circuit and pulse generating circuit to a circuit that receives a signal consisting of a train of pulses whose frequency is known and that differing in frequency. CONSTITUTION:Of a signal containing many pulse trains, the 1st pulse puts delay switching circuit 4 into operation via input circuit A. After operating for a fixed time shorter than period T of a system to be separated and output, circuit 4 stops operating automatically and restarts operating with the next pulse. On detecting circuit 4 stopping operation, trigger signal generating circuit 5 triggers monostable multivibrator 6 with a trigger signal and monostable multivibrator 6 generates a forecast gate signal of longer pulse width than input pulse width. This gate signal and mixed pulse signal are fed to AND gate 8 to separate only a system pulse train with period T. Circuits U0 are connected in parallel as many as mixed pulse systems in the input signal and forecast gate signals of other systems from terminal 7 are input to terminals 2 and 3, so that inputting pulse train signals of other systems will be inhibited.