SU585098A1 - Receiver for locomotive signaling - Google Patents

Description

Ditch to one of the output terminals of the receiver, and through two inverters - to the other.

FIG. 1 is a block diagram of a locomotive alarm receiver; in fig. Figures 2 and 3 show time diagrams explaining the operation of the device and the graphic diagram below (§ — signals at the outputs of the elements; 4-1О — indices of the elements shown in Fig. L).

The locomotive signaling receiver contains receiving inductive coils 1 connected to filter 2, the output of which is connected to amplifier 3. The output of amplifier 3 includes a threshold node 4 connected to time selector 5 and to logic element AND 6. At output of logical element AND 6, an element is included 7 delay and logical element OR 8, the output of which is connected to the first, the inverter 9. The output of the latter is connected to the input

the second inverter Y. The outputs of the first and second HJfflepTopOB are connected respectively to the first and second output terminals 11 and 12 of the receiver.

Upon the arrival of a useful signal pulse and the triggering of the threshold node 4 (see, Fig. 2, the timing diagram of the receiver if the output of the threshold node 4 has a pulse of a useful signal longer than .0.1 s), the time selector 5 together with the logical element And 6 shorten the input pulse 0.1 s. This shortened pulse arrives at the delay element 7, which is triggered from the bottom of the front and also: 0.1 s. The logical element OR 8, connected by its inputs to the outputs of the logical element AND 6 and the delay element 7, provides for the restoration of the pulse duration. ca to the value received from the output of the node 4 threshold. The pulse from the output of the logic element OR 8 is fed to the input of the first inverter 9, the output of which is connected to the output terminal 11 of the receiver (analogous to the rear contact in a typical amplifier). The output of the second inverter 10 is connected to the second output terminal 12 of the receiver (an analogue of the front contact in a typical amplifier). Thus, as can be seen from the timing diagram a, the pulse at the output terminal 12 repeats the input pulse with a delay of 0 s.

In a similar way, it is possible to view the reception of red-yellow, yellow and green codes and to see that the impulses of these premises appear at the output terminal 12 without time distortion. In the case of arrival of interference with a duration of less than 0.1 s (see Fig. 3), the time selector 5 is activated. However, at the output of the AND 6 logic element, the signal -K appears. In this case, x:; the ignorant signal is present at the output terminal 11 and does not pass to the output terminal 12. When the locomotive signaling receiver with temporal selection doesn’t drastically increase the interference immunity of the locomotive signaling devices and, consequently, traffic safety.

Claims (2)

1. Journal of Automatics, Telemechanics and Communication, 1976, No. 4. 2. Vakhnin, M.I., et al. Pathway block and autoregulation, Moscow, Transport, 1974, p. 268-348. 2 . FIG. Have