JP4812722B2 - Track circuit and train control signal receiving method - Google Patents

Description

  The present invention relates to a track circuit using a loop line, and more particularly to a resonant track circuit using a loop line.

  As a conventional method of separating signals having different frequencies flowing through the same path, a method of demultiplexing using a pass band of a filter is known.

  For example, Patent Document 1 discloses that a signal passed through an oscillation output from an oscillator provided in a railroad crossing controller is time-division multiplexed, and level information of the time-division multiplexed signal is a digital signal. A signal equipment inspection device generated by a processing circuit is described.

FIG. 3 is a block diagram of a conventional ATC receiver. In FIG. 3, the ATC receiver 110 includes a reception input unit 12, a capital reception processing unit 130, and a determination processing unit 140. In the reception input unit 120, an attenuator ATT121 and a bandpass filter BPF1 are placed after the TF: transformer. Is connected.
JP 10-138923 A

  The problem to be solved is that the ATC and TD signals flowing through the loop line have a large ATC signal level, so an attenuator is required after the demultiplexing filter to attenuate the ATC signal. It is the point which enlarges.

Orbit circuit using a loop line of the present invention, a transmitter for transmitting a train control signal to said loop line, a receiver for receiving the train control signal from said loop line, said loop line than the receiver And a resonator that reduces the voltage value of the train control signal input to the receiver by reducing the impedance of the loop line of the train control signal band.
The train control signal receiving method of the present invention includes a transmitter that transmits a train control signal to a loop line, and a receiver that receives the train control signal from the loop line. In the method, the voltage of the train control signal input to the receiver is reduced by reducing the impedance of the loop line of the train control signal band by a resonator connected to the loop line side of the receiver. It is characterized by decreasing.

  By the method of connecting the resonator according to the band of the ATC signal in parallel to the field MT of the present invention, most of the ATC signal flows to the resonator side having a low impedance. Is possible. At that time, since the impedance of the loop line in the TD signal band does not change, the level of the TD signal can be maintained. Since the reception levels of both the ATC signal and the TD signal are small, an attenuator for signal attenuation becomes unnecessary.

  Furthermore, if noise removal is performed with a digital filter in the ATC / TD receiver, the BPF can also be deleted, so that there is an advantage that the device can be greatly downsized.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a configuration example of the ATC ground device according to the first embodiment of the present invention. The first embodiment of the present invention has a configuration in which the ATC signal band resonator 11 is added to the configuration of the conventional example of FIG. 3 and the attenuator 121 and the BPF 1 are removed. Therefore, since 12-15 and S11-S14 are the same structures as FIG. 3, description is abbreviate | omitted.

  When the train is on track, the ATC signal S1 and the TD signal S2 always flow through the track circuit R1. An ATC signal band resonator is connected to the track circuit R1, and the impedance is set to be small only for the ATC signal S1.

  In the ATC signal S1, since the impedance of the previous stage of the impedance matching transformer TF appears to be very small, the signal flows in a direction where the impedance is low. Therefore, the signals that pass through the impedance matching transformer TF and are input to the ATC / TD receiver 20 are only the TD signal S1 and the leakage component of the ATC signal.

  Since the leakage component of the ATC signal S1 is very small, the attenuator installed in the conventional configuration shown in FIG. 3 is not necessary. Furthermore, if the noise removal performed by the band pass filter BPF1 is performed by the software attenuator 13, the BPF1 can also be removed.

  By adjusting the constant of the resonator, it is possible to adjust the impedance for each track, and therefore, it can be used to adjust any track.

FIG. 1 is a diagram illustrating a configuration example of an ATC ground device according to Embodiment 1 of the present invention. FIG. 2 is a block diagram of a specific example of the ATC / TD receiver 20 shown in FIG. FIG. 3 is a block diagram of a conventional ATC receiver.

Explanation of symbols

R1 Track circuit 10 ATC transmitter 20 ATC, TD receiver 30 ATC, TD reception input unit 40 ATC, TD reception processing unit 50 ATC, TD determination processing unit 110 ATC receiver 120 ATC reception input unit 130 ATC reception processing unit 140 ATC Determination processing unit TF Impedance matching transformer 12, 11 ATC signal band resonator 13, 12, 131 A / D converter 14, 13, 132 Software attenuator 15, 14, 134 MSK modulation unit 16, 15, 139 Correction control unit 17, S1 ATC wave 18, S2 TD wave

Claims (2)

In a track circuit using loop lines,
A transmitter for transmitting a train control signal to the loop line;
A receiver for receiving the train control signal from the loop line;
An ATC signal band resonator connected in parallel with the impedance matching transformer before the impedance matching transformer on the loop line side of the receiver to reduce the impedance of the loop line of the train control signal band ; Prepared,
The ATC signal band for resonator, by part of the ATC signal flows to the resonator side, the track circuit, characterized and Turkey decreases the voltage value of the train control signal input to the receiver . In a train control signal receiving method of a track circuit comprising: a transmitter that transmits a train control signal to a loop line; and a receiver that receives the train control signal from the loop line.
The impedance of the loop line in the train control signal band is reduced by the ATC signal band resonator connected in parallel with the impedance matching transformer in the preceding stage of the impedance matching transformer on the loop line side from the receiver. A train control signal receiving method , wherein a voltage value of the train control signal input to the receiver is decreased when a part of the ATC signal flows to the resonator side .

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