TRACK CIRCUIT SIGNAL RECEIVER Russian patent published in 2006 - IPC B61L23/16 

FIELD: railway signaling and communication.

SUBSTANCE: invention can be used at internal control of traffic on sections between stations and at stations. Proposed device contains series-connected first band filter, amplitude detector, second band filter and first threshold element. Input of first band filter is input of device. Amplifier is provided to output of which track relay is connected. Moreover, device is provided with inhibit element and second threshold element placed between output of second band filter and inverting input of inhibit element. Direct input of inhibit element is connected with output of first threshold element. Input of amplifier is connected to output of inhibit element. Threshold of operation of first threshold element is equal to minimum designed value of signal amplitude at output of second band filter. Threshold of operation of second threshold element is equal to maximum designed value of signal amplitude at output of second band filter.

EFFECT: improved reliability of device owing to checking of maximum tolerable level of modulating signal.

1 dwg