TRACK CIRCUIT RECEIVER Russian patent published in 1998 - IPC

FIELD: railway transport; automatic signalling and condition checking of rail lines. SUBSTANCE: receiver has units evaluating amplitude of rail line control signal and interference variance whose values are used at calculation of cumulative sum. Output signal of receiver is changed over, depending on detected conditions, to operate signal lights and switch contacts. Switch is placed between output of evaluation unit and input of cumulative sum calculation unit. Under normal operating conditions of rail line, value of cumulative sum rises continuously, signal/interference ratio exceeds limiting threshold, and signal is formed at receiver output corresponding to normal operating conditions. EFFECT: improved reliability. 4 dwg