JP2014159185A - Transmitter for track circuits - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmitter for track circuits that prevents output of an unnecessary frequency component during a transition of a signal transmitting state.SOLUTION: A transmitter for track circuits 1 includes: an ATC signal output control unit 3; an ATC carrier wave generator 4; a selector 6 that selects in response to an instruction 5, which is received from the ATC signal output control unit 3, whether or not to output an input signal received from the ATC carrier wave generator 4; a modulator 8 that performs frequency modulation according to ATC information 7 to be sent from the ATC signal output control unit 3; a level adjuster 10 that adjusts an output level in response to an instruction 9 received from the ATC signal output control unit 3; an amplifier 11 that amplifies the power of an output of the level adjuster 10; a voltage sensing unit 13 that senses an output voltage of an output signal and outputs the output voltage as voltage feedback information 12; and a current sensing unit 15 that senses an output current of the output signal and outputs the output current as current feedback information 14. Transmission of a signal is ceased or initiated via the level adjuster, whereby output of an unnecessary frequency component is prevented.

Description

  The present invention relates to a track circuit transmitter. For example, the present invention relates to a track circuit transmitter suitable for use in an automatic train control device (hereinafter referred to as an ATC (Automatic Train Control) device) which is a railway safety device.

  As a background art in this technical field, there is JP 2010-274832 A (Patent Document 1). In this publication, the problem is to “prevent potential of failure in an untransmitted state”, and “ATC signal output control unit, ATC carrier wave generator and inspection signal wave generator, ATC carrier wave generation” A selector that outputs an output or non-output of an input signal from a tester or an inspection signal wave generator according to an instruction from the ATC signal output control unit 3 and a frequency modulation according to ATC information transmitted from the ATC signal output control unit A modulator, an amplifier that amplifies the output of the modulator 9, a voltage detector that detects the output voltage of the output signal and outputs it as voltage feedback information, and detects the output current of the output signal and outputs it as current feedback information A track circuit transmitter including a current detecting unit that outputs an ATC signal when the train is present and matches the train presence state when the train is not present. And it outputs the test signal when necessary Te. Has been described as ".

JP 2010-274832 A

  Patent Document 1 describes a mechanism of an ATC device and a track circuit transmitter. For example, as shown in FIG. 2, the ATC apparatus includes a TD signal transmitter 19, an ATC signal transmitter 20, and a TD signal receiver 21 for each track circuit.

  The TD signal transmitter 19 receives a control signal (TD signal output instruction and TD signal output stop instruction) from the ATC logic unit 2 via the communication network 25, and train detection signals (hereinafter referred to as TD signal output instructions) TD (Train Detection) signal) is output and transmitted to the track circuit 17.

  The ATC signal transmitter 20 receives control signals (ATC signal output instruction and ATC signal output stop instruction) from the ATC logic unit 2, and outputs an automatic train control signal (hereinafter referred to as an ATC signal) to the track circuit 17. Send.

  The TD signal 23 is transmitted to the TD signal receiver 21 via the track circuit 17, and the ATC signal 24 is transmitted to the on-board device of the train 22 via the track circuit 17.

  There are two types of track circuits 17, an insulated track circuit that interposes an insulator between adjacent track circuits and a non-insulated track circuit that does not interpose an insulator.

  In the insulated track circuit, each track circuit is electrically insulated. For this reason, signals transmitted from the TD signal transmitter 19 and the ATC signal transmitter 20 do not leak to adjacent track circuits. Therefore, it is possible to always transmit the TD signal 23 and the ATC signal 24 regardless of the presence state of the train 22 to the track circuit 17. In addition, the insulated track circuit has the advantage that the ATC signal 24 and the TD signal 23 can be configured by the same signal, and the system configuration can be simplified.

  On the other hand, in recent years, since the installation cost and maintenance cost of an insulator in an insulated track circuit are high, an ATC device to which an uninsulated track circuit is applied has attracted attention.

  Since the non-insulated track circuit has no insulator between the track circuits, the adjacent track circuits are electrically connected. For this reason, in order to prevent interference in the adjacent track circuit, it is necessary to prepare a plurality of different frequencies and assign them to each track circuit for the TD signal 23 that is constantly transmitted. On the other hand, the ATC signal 24 is transmitted only to the track circuit on which the train 22 is located. This prevents interference between ATC signals in adjacent track circuits.

  When the train 22 moves from the standing line state on the track circuit to the adjacent track circuit and enters the non-tracking state, the ATC signal transmission state transitions to the non-transmission state. At that time, the selector (see selector 1 in FIG. 1) that selects the carrier wave for the ATC signal operates to switch from the ATC signal transmission state to the non-transmission state. However, since the carrier wave for the ATC signal is disconnected regardless of the transmission state of the ATC signal when the transmission state is switched by the selector, the transmission signal (ATC signal) output from the track circuit transmitter to the track circuit is suddenly disconnected. And stop (see FIG. 9). In this case, a transiently unnecessary frequency band signal is output for a short time. For example, when a frequency component in the same band as that of the TD signal is generated when the ATC signal is disconnected, there is a possibility that the train 22 may be erroneously controlled, which is not preferable in terms of train security.

  Therefore, when there is a change in the transmission state of the signal transmitted to the track circuit, the present invention transitions the state of the transmission signal while suppressing the frequency band component that causes erroneous control on the train in the track circuit. A track circuit transmitter is provided.

  In order to solve the problems described above, the present invention provides a track circuit transmitter, for example, when the track circuit transitions from a train existing line to a non-existing line, or from a train non-existing line to a present line, while maintaining the frequency of the transmission signal, Means for changing the output level of the transmission signal and performing transition control to stop or start the signal.

  The means for transition control is, for example, a level adjuster that adjusts the voltage level of the transmission signal to be output to the track circuit in accordance with an instruction from the signal output control unit so as to gradually decrease or increase, or the voltage level of the transmission signal. It is a circuit that detects and stops the transmission signal when the level becomes 0 or a value close to 0.

  Furthermore, in a specific example, the track circuit transmitter of the present invention detects an output level of a signal to be transmitted to the track circuit, and monitors whether the track circuit transmitter has a failure with the output level, and the monitoring unit A signal output control unit that controls a signal output to the track circuit, and a level adjustment unit that adjusts an output level of the signal. When a transition is made from a train standing line to a non-existing line or from a train non-existing line to a standing line, the level adjuster is instructed to adjust the output level of the signal. In response, while maintaining the frequency of the signal transmitted to the track circuit, the output level of the signal is changed so as to gradually decrease or rise, and the signal is stopped or started.

  Track circuit transmitter, wherein the signal is an ATC signal and / or a TD signal, and further a carrier wave generator for generating an ATC and / or TD carrier wave carrying the ATC signal and / or TD signal And a selection unit that selects or deselects the ATC and / or TD carrier wave, and the signal output control unit selects the ATC and / or TD carrier wave for the selection unit, or If the carrier wave is selected by instructing whether it is not selected, the ATC signal and / or TD signal carried by the carrier wave is output.

  The track circuit transmitter includes a level adjuster that receives a level adjustment instruction from the signal output control unit and adjusts the voltage level of the carrier wave for the ATC and / or TD signal. The ATC and / or TD signal is stopped when the voltage level is at a zero crossing point, and the output of the ATC and / or TD signal is started from the zero level.

  The track circuit transmitter of the present invention includes an ATC signal carrier wave or TD signal carrier wave that outputs an ATC or TD signal to the track circuit, and the ATC signal carrier wave or TD signal. When selecting a carrier wave, selecting or deselecting a carrier wave, and instructing the selection unit to select or deselect the carrier wave for ATC signal or TD signal, and selecting the carrier wave, A signal output control unit that outputs the ATC signal or TD signal carried by the carrier wave, and an output level of the ATC signal or TD signal are detected, and the presence or absence of a failure in the track circuit transmitter is monitored based on the output level. A track circuit transmitter having a monitoring unit, wherein when the track circuit transitions from a train existing line to a non-existing line, or from a train non-existing line to a present line, the A While maintaining the frequency of the carrier wave for C signal or the carrier wave for TD signal, the output level of the carrier wave for ATC signal or the carrier wave for TD signal is changed so as to be gradually lowered or raised, and the signal is stopped or started. A level adjusting means for controlling as described above is provided.

  The track circuit transmitter of the present invention receives an instruction signal from the ATC logic unit and selects a carrier wave for ATC signal or a carrier wave for TD signal, an ATC signal, a carrier wave for ATC signal, or a TD signal. A signal output control unit that outputs a level adjustment instruction signal that adjusts the voltage level of the carrier wave, a carrier wave generator that generates the ATC signal carrier wave or TD carrier wave, and selection of the signal output control unit Receiving a signal, receiving a ATC signal carrier wave of the carrier wave generator, or a selector for selecting whether to output a carrier wave for a TD signal, and receiving an ATC signal or a TD signal of the signal output control unit, A modulator that modulates the ATC signal or TD signal with the carrier wave for ATC signal or TD signal of the selector, and the modulation signal of the modulator is increased. An amplifier that outputs to the track circuit side, a monitoring unit that detects an output signal of the amplifier, and outputs the detection signal to the signal output control unit as feedback information for transmitter failure monitoring; and the signal output control unit A level adjuster that receives a level adjustment instruction signal and adjusts the voltage level of the modulation signal of the modulator, and when a transition from a train existing line to a non-existing line or a train non-existing line to the existing line to the track circuit The level adjuster changes the output level of the modulation signal while maintaining the frequency component of the modulation signal of the modulator, and stops or starts the output of the ATC signal or TD signal to the track circuit. It is characterized by doing.

  According to the present invention, when the output of the transmission signal is stopped or the output of the transmission signal is started, the level of the signal is smoothly changed while maintaining the frequency component of the signal, so that the train of the track circuit can be changed. On the other hand, it is possible to prevent the output of unnecessary frequency components in the frequency band that causes erroneous control, and to continue train control safely.

  For example, when the output of the ATC signal and / or TD signal is stopped or started, the carrier wave level is smoothly changed while maintaining the frequency component of the carrier wave for ATC signal and / or the carrier wave for TD signal. By stopping, starting or stopping, output of unnecessary frequency components can be prevented, and train control can be continued safely.

It is a block diagram which shows the structure of the ATC signal transmitter which shows an example of the transmitter for track circuits of this invention. It is a schematic block diagram of the ATC system to which the ATC signal transmitter and TD signal transmitter of the present invention are applied. In the ATC signal transmitter, when the train moves from the track circuit to the adjacent track circuit, transmission of the ATC signal to the track circuit is stopped and transmission of the ATC signal to the adjacent track circuit is started. is there. FIG. 6 is a signal waveform diagram schematically showing the behavior of the voltage level of a transmission signal when ATC signal transmission is stopped in the ATC signal transmitter. It is a signal waveform diagram of the voltage level which shows a mode that a transmission signal stops in a zero crossing point (0V) in an ATC signal transmitter. FIG. 6 is a signal waveform diagram schematically showing the behavior of the voltage level of a transmission signal when ATC signal transmission is started in the ATC signal transmitter. It is a block diagram which shows the structure of the TD signal transmitter which shows the other example of the track circuit transmitter of this invention. It is a circuit diagram which shows one specific example of the level adjuster in an ATC signal transmitter. It is a circuit diagram which shows the other example of a level adjuster. FIG. 5 is a signal waveform diagram schematically showing the behavior of the voltage level when ATC signal transmission is stopped when the level adjuster of the present invention is not applied.

  Embodiments of the present invention will be described below with reference to the drawings. The present invention is also applicable to an ATC signal transmitter, a TD signal transmitter, or other signal transmitters such as a signal transmitter that transmits a signal for confirming whether or not a ground-side device is operating normally. In this example, an ATC signal transmitter, which is one of the track circuit transmitters of the present invention, will be described.

  FIG. 1 is a block diagram showing a configuration of an ATC signal transmitter showing an example of a track circuit transmitter. In the figure, the ATC signal transmitter 1 of the track circuit transmitter includes an ATC signal output control unit 3, an ATC carrier wave generator 4, a selector 6, a modulator 8, monitoring units 13 and 15, A level adjuster 10 and an amplifier 11 are included.

  The ATC signal output control unit 3 receives the control signal 18 from the ATC logic unit 2 and outputs an ATC signal carrier wave selection signal (selection instruction) 5, an ATC signal 7, and an ATC transmission signal level adjustment instruction 9.

  The ATC carrier wave generator 4 has a desired frequency and generates the ATC signal carrier wave.

  The selector 6 receives the selection instruction 5 from the ATC signal output controller 3 and selects whether or not to output the ATC signal carrier wave of the ATC carrier wave generator 4 to the modulator 8 based on the instruction.

The modulator 8 receives the ATC signal 7 of the ATC signal output control unit 3, frequency-modulates the ATC signal with the ATC signal carrier wave output from the selector 6, and outputs the modulated signal to the subsequent stage.
The amplifier 11 amplifies the power of the ATC signal modulated by the modulator 8 and outputs it as a transmission signal to the track circuit 17 side.

  The level adjuster 10 is switched from the state where the selector 6 selects the ATC carrier wave to the non-selected state, that is, when the output of the ATC carrier wave to the modulator 8 and the level adjuster 10 is stopped. In response to the level adjustment instruction 9 from the ATC signal output control unit 3, the ATC signal output control unit 3 has a function of adjusting the voltage level of the ATC signal (ATC signal carrier wave) output from the modulator 8.

  In this example, the level adjuster 10 is disposed between the modulator 8 and the amplifier 11, but the level adjuster 10 may be disposed immediately before the modulator 8 or after the amplifier 11. Moreover, the level adjuster 10 is comprised with a smoothing filter, for example. In short, any configuration may be used as long as it has a function of changing the voltage level of the carrier wave for the ATC signal so that the voltage level gradually or smoothly decreases.

  With such a configuration, in the case of transition from the train existing line to the non-existing line to the track circuit 17 or from the train non-existing line to the existing line, the frequency component of the output signal (ATC signal carrier wave) of the modulator 8 is maintained while The voltage level of the output signal is changed gradually or smoothly so that the output of the ATC signal 7 to the track circuit 17 is stopped (see FIG. 4).

  The monitoring units 13 and 15 monitor the output signal of the amplifier 11 of the ATC signal transmitter 1 and monitor the failure state of the transmitter 1 with the output signal. The voltage detection unit 13, the current detection unit 15, Have

  The voltage detection unit 13 detects the voltage of the output signal of the amplifier 11 and outputs the detected voltage to the ATC signal output control unit 3 as voltage feedback information 12. The current detector 15 detects the output current of the amplifier 11 and outputs the detected current to the ATC signal output controller 3 as current feedback information 14.

  The ATC logic unit 2 receives the TD signal 23 from the TD receiver 21 (see FIG. 2), determines the on-line state of the train 22 based on the TD signal, and the ATC signal output control unit 3 An ATC signal output instruction is given by the control signal 18.

The ATC signal output control unit 3 that has received the ATC signal output instruction from the ATC logic unit 2 outputs the above-described ATC signal carrier wave selection signal (selection instruction) 5 to the selector 6, and the ATC signal 7 is modulated. 8 is output.
Thereby, the ATC signal carrier wave from the ATC carrier wave generator 4 is input to the modulator 6, modulates the ATC signal 7, and sends the modulated signal as a transmission signal via the amplifier 11. .

  When the train 22 (see FIG. 2) enters the adjacent track circuit, the ATC signal is not interfered with the ATC signal from the ATC signal transmitter 20 (see FIG. 2) transmitted to the adjacent track circuit. Need to stop immediately. Therefore, when the train 22 enters the adjacent track circuit, the ATC logic unit 2 issues an ATC signal stop instruction to the ATC signal output control unit 3 with the control signal 18.

  Upon receiving the ATC signal stop instruction, the ATC signal output control unit 3 instructs the selector 6 to select the non-output (ATC signal carrier wave cut) side that does not select the ATC signal carrier wave. At this time, when there is no level adjuster 10, the output level of the modulator 8 behaves as shown in FIG. When such a behavior signal is output to the track circuit 17 via the amplifier 11, an unnecessary frequency band component is included as described above, and thus there is a possibility that the train 22 is erroneously controlled. .

In order to correct such a problem, the present invention is provided with, for example, a level adjuster 10 and adjusts the output voltage level of the transmission signal to the track circuit 17 with the level adjuster.
That is, when receiving the ATC signal stop instruction, the ATC signal output control unit 3 instructs the selector 6 not to select the carrier wave for ATC signal with the selection instruction 5 and also instructs the level adjuster 10. In response to the level adjustment instruction 9, an instruction to adjust the voltage level of the carrier wave for the ATC signal is issued.

The level adjuster 10 that has received the level adjustment instruction 9 changes the voltage level of the output signal (ATC signal carrier wave) from the modulator 8 to gradually decrease, that is, to smoothly decrease the voltage level. , Adjust to 0 level. By this level adjustment, it is possible to prevent unnecessary frequency components from being output from the ATC signal transmitter 1 to the track circuit 17.
For example, a smoothing filter is used as the level adjuster 10 that smoothly changes the voltage level to the 0 level.

  FIG. 8 is a circuit diagram showing an example when the smoothing filter 101 is used as the level adjuster 10.

  In the figure, the smoothing filter 101 receives the level adjustment instruction 9 from the switch unit 102, for example, and switches on / off.

  For example, as shown in FIG. 9, the smoothing filter 101 is constituted by a smoothing filter using a moving average, a so-called digital filter. Then, according to the level adjustment instruction 9, it is selected whether or not the output is a smoothing filter.

  FIG. 4 is a diagram showing the behavior of the output signal (voltage level V of the carrier wave for ATC signal) when ATC signal transmission is stopped. The voltage level V of the output signal decreases with time T and changes to 0 It is the figure which showed a mode that it does.

  As a result, as shown in FIG. 10, there is no sudden change from a high level suddenly to a zero level, so that a signal including an unnecessary frequency component is output to the track circuit 17 side when the transmission output of the ATC signal is stopped. Things will disappear.

In the embodiment, a smoothing filter is used as the level adjuster 10. However, a method of detecting a zero cross point of the signal and stopping the signal when the level is 0 or small may be used.
For example, as shown in FIG. 9, a circuit 103 for detecting the output voltage of the modulator 8 and a circuit 102 for stopping a transmission signal to the track circuit 17 when the output voltage becomes 0 or a value close to 0 are included. A circuit means 104 may be provided, and the signal may be stopped by the circuit means.

  In this case, the voltage level behaves as shown in FIG. 5, for example. FIG. 5 is a signal waveform diagram schematically showing the behavior of the voltage level at which ATC signal transmission is stopped at the zero cross point (0 V) in the ATC signal transmitter. Even in such a method, output of unnecessary frequency components can be prevented.

  As described above, the level adjuster 10 does not have to be arranged after the modulator 8. For example, it may be arranged before the selector 6, after the selector 6, or after the amplifier 11.

  In the present embodiment, the level adjustment when the signal is stopped has been described. However, the level adjustment can also be applied when the signal output is started. Even at the start of signal output, the selector 6 changes from the non-output state to the output state, so there is a possibility that an unnecessary frequency component may be output. Signal output can be started.

  FIG. 6 is a signal waveform diagram schematically showing the behavior of the voltage level of the transmission signal when ATC signal transmission is started in the ATC signal transmitter.

  In the first embodiment, the ATC signal is described as an example. However, other signals such as a TD signal can be used in the same manner, and output of unnecessary noise components can be prevented.

  FIG. 7 is a block diagram showing a configuration of a TD signal transmitter showing another example of the track circuit transmitter of the present invention.

  In the same figure, a TD signal transmitter 19 (see FIG. 2) includes a TD signal output control unit 3 ′, a TD carrier wave generator 4 ′, a selector 6 ′, and a modulator, like the ATC signal transmitter 20. 8 ′, monitoring units 13 ′ and 15 ′, a level adjuster 10 ′, and an amplifier 11 ′.

  The TD signal output control unit 3 ′ receives the control signal 18 from the ATC logic unit 2, outputs the TD signal, and selects the TD signal carrier wave to the selector 6 ′ (selection instruction) 5 ′. , A TD signal 7 ′ is output to the modulator 6, and a level adjustment signal (level adjustment instruction) 9 ′ for adjusting the voltage level of the carrier wave for the TD signal is output to the level adjuster 10 ′. .

  The TD signal receiver 21 (see FIG. 2) includes a TD signal receiving unit that receives a TD signal and outputs the TD signal to the ATC logic unit 2.

  The level adjuster 10 ′ has a function of adjusting the output level of the TD signal 7 ′ (voltage level of the carrier wave for TD signal) as in the level adjuster 10 of the first embodiment. Others are the same as those in the first embodiment, and the description is omitted.

  In the above-described embodiment, an example in which the ATC signal and the TD signal are modulated has been described. However, the present invention is also applied to a signal that is not modulated, a so-called unmodulated signal (carrier wave level adjustment). be able to.

In addition, this invention is not limited to the Example mentioned above, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.
Each of the above-described configurations, functions, processing units, processing means, and the like may be realized by hardware by designing a part or all of them with, for example, an integrated circuit. Each of the above-described configurations, functions, and the like may be realized by software by interpreting and executing a program that realizes each function by the processor. Information such as programs, tables, and files for realizing each function can be stored in a recording device such as a memory, a hard disk, an SSD (Solid State Drive), or a recording medium such as an IC card, an SD card, or a DVD.
Further, the control lines and information lines indicate what is considered necessary for the explanation, and not all the control lines and information lines on the product are necessarily shown. Actually, it may be considered that almost all the components are connected to each other.

DESCRIPTION OF SYMBOLS 1 Transmitter for track circuits 2 ATC logic part 3 ATC signal output control part 4 ATC carrier wave generator 5 Selection signal from ATC signal output control part to selector 6 Selector 7 ATC from ATC signal output control part to modulator Information 8 Modulator 9 Level adjustment instruction from ATC signal output controller to level adjuster 10 Level adjuster 11 Amplifier 12 Voltage feedback information 13 Voltage detector 14 Current feedback information 15 Current detector 16 Output signal 17 Track circuit 18 ATC logic Output instruction from track unit to track circuit transmitter 19 TD signal transmitter 20 ATC signal transmitter 21 TD receiver 22 Train 23 TD signal 24 ATC signal 25 Communication network

Claims (5)

In a track circuit transmitter for transmitting a signal to a track circuit,
A monitoring unit that detects an output level of the signal and monitors the presence or absence of a failure of the track circuit transmitter with the output level;
A signal output control unit that receives an output signal of the monitoring unit and controls a signal output to the track circuit;
A level adjustment unit for adjusting the output level of the signal,
The signal output controller is
When the track circuit transitions from a train standing line to a non-existing line, or from a train non-existing line to a standing line, the level adjuster is instructed to adjust the output level of the signal,
The level adjustment unit
Receiving the output level adjustment instruction, maintaining the frequency of the signal to be transmitted to the track circuit, changing the output level of the signal so as to gradually decrease or rise, and stopping or starting the signal. Track circuit transmitter. The track circuit transmitter according to claim 1,
The signal is an ATC signal and / or a TD signal, and further, a carrier wave generator that generates a carrier wave for the ATC and / or TD signal that carries the ATC signal and / or TD signal;
A selection unit for selecting or deselecting the carrier wave for the ATC and / or TD signal,
The signal output control unit instructs the selection unit to select or deselect the carrier wave for ATC and / or TD signal, and when the carrier wave is selected, the signal wave is carried by the carrier wave. A transmitter for an orbital circuit that outputs an ATC signal and / or a TD signal. The track circuit transmitter according to claim 2,
The level adjustment unit includes a level adjuster that receives a level adjustment instruction from the signal output control unit and adjusts the voltage level of the carrier wave for the ATC and / or TD signal, and the ATC is at the zero cross point. And / or stopping the TD signal and starting outputting the ATC and / or TD signal from zero level. A carrier wave generator for generating an ATC signal carrier wave or a TD signal carrier wave for outputting an ATC or TD signal to a track circuit;
A selection unit for selecting or deselecting the carrier wave for ATC signal or the carrier wave for TD signal;
When the selection unit is instructed to select or not select the carrier wave for ATC signal or the carrier wave for TD signal, and the carrier wave is selected, the ATC signal or TD signal carried by the carrier wave A signal output control unit for outputting
A monitoring unit for detecting an output level of the ATC signal or the TD signal and monitoring the presence or absence of a failure of the track circuit transmitter with the output level;
A transmitter for an orbital circuit comprising:
When the track circuit transits from a train-existing line to a non-existing line, or from a train non-existing line to a standing line, while maintaining the frequency of the carrier wave for ATC signal or carrier wave for TD signal, the carrier wave for ATC signal or TD signal A track circuit transmitter comprising level adjusting means for controlling the output level of a carrier wave to gradually decrease or increase and to stop or start the signal.   A level for receiving the instruction signal from the ATC logic unit and adjusting the voltage level of the selection signal for selecting the carrier wave for ATC signal or the carrier wave for TD signal, the carrier wave for ATC signal, the carrier wave for ATC signal, or the carrier wave for TD signal A signal output control unit that outputs an adjustment instruction signal; a carrier wave generator that generates the carrier wave for ATC signal or TD carrier wave; and a selection signal from the signal output control unit; A selector for selecting whether or not to output a carrier wave for ATC signal or a carrier wave for TD signal, and the ATC signal or TD signal of the signal output control unit, and the ATC signal or TD signal is selected. A modulator that modulates the ATC signal carrier wave or TD signal carrier wave of the modulator, and an amplifier that amplifies the modulation signal of the modulator and outputs it to the track circuit side And a monitoring unit that detects an output signal of the amplifier and outputs the detection signal as feedback information for transmitter failure monitoring to the signal output control unit, and receives a level adjustment instruction signal of the signal output control unit, A level adjuster that adjusts the voltage level of the modulation signal of the modulator, and when transitioning from a train existing line to a non-existing line or a train non-existing line to the existing line to the track circuit, with the level adjuster, A track circuit characterized by changing the output level of the modulation signal while maintaining the frequency component of the modulation signal of the modulator, and stopping or starting output of the ATC signal or TD signal to the track circuit Transmitter.

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