Circuit arrangement for producing axle counting pulses for axle counting systems for railway safety systems

摘要

Detectors (IR1, IR2) are arranged on the track for the purpose of producing control signals for axle counting devices and the said detectors (IR1, IR2) are capable of outputting control signals with signal glitches as a result of interference signals. The intention is that even when such faults occur correct control signals without the aforesaid glitches should be triggered. The control signals which are prone to interference are indirectly fed to a clock-controlled processing unit (VT) via a multi-stage shift register (SR) to whose outputs (Q1 To Q5) the processing unit (VT) is connected with the aid of an OR element (OD). Railway safety systems. IMAGE