JPH0918382A - Transponder - Google Patents

Abstract

PURPOSE: To prevent the transmission of information waves at the time of being in an initial state by stopping the transmission of the information waves after a data conversion circuit is supplied with power and activated until first transmission data are supplied. CONSTITUTION: An input processing circuit 14 input-processes the transmission data S1 and supplies the transmission data S1 to the data conversion circuit 1. The data conversion circuit 1 is provided with a conversion part 11, a reception start detection part 12 and an output part 13. The conversion part 11 converts the inputted transmission data S1 to the information waves S2 of a different frequency and outputs them. For instance, the transmission data S1 inputted as digital information are modulated to the information waves S2 of FSK signals or the like and transmitted. The reception start detection part 12 outputs output enable signals D3 when the first transmission data S1 are supplied after the power Vd is supplied. The output part 13 is inputted with the information waves S2 and the output enable signals S3 and transmits the information waves S2 when the output enable signals S3 are supplied.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to transponders.

[0002]

2. Description of the Related Art A conventional transponder, for example, a transponder installed on the ground side, is activated by a power supply supplied from a ground processing device, and then polls transmission data (transmission message) supplied from the ground processing device as an information wave. And the converted information wave is transmitted to the upper side of the vehicle. The information wave is composed of an FSK signal. For example, when transmitting from the ground side to the vehicle upper side, the carrier center frequency is set to 1.708 MHz, and corresponds to logic "1" and corresponds to 1.676 MHz and logic "0". Then, it is modulated to 1.740 MHz. The transponder is in the initial state until the transmission data is supplied, and transmits the information wave in which all bits are logical "1". An information wave in which all bits are logical "1" is not possible due to the structure of the transmission message. For this reason, when the transponder on the ground side is activated, if the transponder on the ground side and the transponder on the vehicle upper side are in a coupled state, it is determined that an abnormality has occurred on the ground side on the vehicle upper side, and the onboard device is Stop vehicle control.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a transponder which does not transmit an information wave when in the initial state.

[0004]

To solve the above problems, the transponder according to the present invention includes a data conversion circuit. The data conversion circuit converts the input transmission data into an information wave having a different frequency, stops the transmission of the information wave until the first transmission data is supplied after being activated by power supply.

In a preferred example, the data conversion circuit is
The conversion unit, the reception start detection unit, and the output unit are included. The conversion unit converts the transmission data into the information wave. The reception start detection unit outputs an output enable signal when the first transmission data is supplied after power is supplied. The output unit receives the information wave and the output enable signal, and transmits the information wave when the output enable signal is supplied.

In another preferable example, the reception start detection unit outputs an output enable signal when the first transmission data is supplied after power is supplied. The conversion unit converts the transmission data into the information wave, and outputs the information wave when the output enable signal is supplied. The output unit transmits the input information wave.

The transmission data is preferably provided by polling of a processing unit having jurisdiction over the transponder.

More preferably, the transmission data is superimposed on the power source and input.

[0009]

Since the data conversion circuit converts the input transmission data into information waves having different frequencies, for example, the transmission data input as digital information can be modulated into an information wave such as an FSK signal and transmitted.

Since the data conversion circuit stops transmission of the information wave after the power is supplied and is activated until the first transmission data is supplied, the initial state (the first transmission data is supplied after the activation). Information wave is not transmitted during the period.

The data conversion circuit includes a conversion unit, a reception start detection unit, and an output unit. The conversion unit converts the transmission data into an information wave. The reception start detection unit outputs the output enable signal when the first transmission data is supplied after the power is supplied. The output unit receives the information wave and the output enable signal, and transmits the information wave when the output enable signal is supplied. In this preferred example, even if the conversion unit outputs the information wave of all-bit logic "1" during the initial state, the output unit does not transmit the information wave until the output enable signal is input. Therefore, the information wave is not transmitted.

In the preferred example where the transmitted data is provided by polling of the processing unit responsible for the transponder,
The transmission of the information wave can be stopped until the transmission of the information wave becomes necessary.

More specific features and advantages of the present invention will be more specifically described with reference to the drawings.

[0014]

1 is a block diagram showing the configuration of a transponder according to the present invention. The transponder according to the present invention includes a data conversion circuit 1. The data conversion circuit 1 converts the input transmission data S1 into an information wave S2 having a different frequency, and after the power Vd is supplied and activated, the information wave S2 is transmitted until the first transmission data S1 is supplied. Stop. The transmission data S1 is HDLC (High Level Data).
Link Contorol) frame configuration,
For example, one frame is composed of 80 bits. One frame has a flag (8 bits), data (48 bits), C
RCC (Cyclic Redundancy Check Character) (16
Bits) and flags (8 bits). The baud rate of the transmission data S1 is set to 1200 bps, for example. The information wave S2 is composed of, for example, a frequency shift signal (FSK signal) and has a carrier center frequency f0 of 1.708 MH.
z and the shift frequency Δf are set to 32 kHz. "1"
The frequency corresponding to the logic is 1.676MHz, logic "0"
Corresponds to 1.740 MHz. Information wave S
The baud rate of 2 is set to 64 kbps, for example.

The input processing circuit 14 performs input processing of the transmission data S1 and supplies the transmission data S1 to the data conversion circuit 1.

As described above, the data conversion circuit 1 converts the input transmission data S1 into the information wave S2 having a different frequency and outputs the information wave S2. Therefore, for example, the transmission data S1 input as digital information is converted into an FSK signal or the like. The information wave S2 can be modulated and transmitted.

Since the data conversion circuit 1 stops the transmission of the information wave S2 until the first transmission data S1 is supplied after the power supply Vd is supplied and is activated, the data conversion circuit 1 is in an initial state (first transmission after activation). Until the data S1 is supplied), the information wave S2 is not transmitted.

In the embodiment shown in FIG. 1, the data conversion circuit 1
Includes a conversion unit 11, a reception start detection unit 12, and an output unit 13. The conversion unit 11 converts the transmission data S1 into the information wave S2. The reception start detection unit 12 outputs the output enable signal S3 when the first transmission data S1 is supplied after the power supply Vd is supplied. The output unit 13 receives the information wave S2 and the output enable signal S3, and transmits the information wave S2 when the output enable signal S3 is supplied. According to this configuration, even if the conversion unit 11 outputs the information wave S2 of all-bit logic "1" during the initial state, the output unit 13 outputs the information wave S2 until the output enable signal S3 is input. Is not output, the information wave S2 is not transmitted.

In the embodiment, the transmission data S1 is given by polling of the processing device having jurisdiction over the transponder. According to this configuration, the transmission of the information wave S2 can be stopped until the transmission of the information wave S2 is required, and the false abnormality detection on the vehicle upper side can be minimized.

FIG. 2 is a block diagram showing the configuration of another embodiment of the transponder according to the present invention. In the figure, the same reference numerals as those in FIG. 1 indicate the same components.

The reception start detector 12 outputs the output enable signal S3 when the first transmission data S1 is supplied after the power Vd is supplied. The converter 11 converts the transmission data S1 into an information wave S2, and outputs the information wave S2 when the output enable signal S3 is supplied. The output unit 13 transmits the input information wave S2. According to this configuration, the converter 11 keeps the information wave S in the initial state.
Since no 2 is output, the information wave S2 is not transmitted.

In the embodiment, the transmission data S1 is input while being superimposed on the power supply Vd. The input processing circuit 14 separates and extracts the transmission data S1 and the power supply Vd, and outputs the transmission data S1.
Is supplied to the conversion unit 11, and the power supply Vd is supplied to the data conversion circuit 1. According to this configuration, the transmission line of the transmission data S1 and the power supply can be simplified, and an inexpensive transponder can be obtained.

FIG. 3 is a diagram showing the structure of a ground device using the transponder according to the present invention. The figure shows automatic train stop device (ATS device), automatic train operation device (ATO device)
Etc. are shown. In the drawings, the same reference numerals as those in FIGS. 1 and 2 indicate the same components. In the transponder A, the data conversion circuit 1a and the ground element 2a are integrally formed. In the transponder B, the data conversion circuit 1b and the ground element 2b are separately configured. The data conversion circuit 1 is provided in a portion called a repeater in the ATS device. The ground elements 2a and 2b include transmitting and receiving coils and transmit the information waves S2a and S2b supplied from the data conversion circuits 1a and 1b to the vehicle upper side. The ground processing device 3 supplies the power supplies Vda and Vdb to the transponders A and B to activate the transponders A and B. After that, the transponder A is polled and the transmission data S1a is transmitted. Then, the transponder B is polled and the transmission data S1b is transmitted. The car child 4 is a transponder A or B.
To receive the information waves S2a and S2b. The on-board processing device 5 decodes the information waves S2a and S2b, obtains control information according to the transmission data S1a and S1b, and controls the vehicle 6. Therefore, even when the transponder A or the transponder B is activated when the vehicle upper child 4 is on the transponder A or the transponder B, the on-vehicle processing device 5
In, the transponder A or the transponder B is not determined to be abnormal.

[0024]

As described above, according to the present invention, it is possible to provide a transponder that does not transmit an information wave in the initial state.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a transponder according to the present invention.

FIG. 2 is a block diagram showing the configuration of another embodiment of the transponder according to the present invention.

FIG. 3 is a diagram showing a configuration of a ground device using a transponder according to the present invention.

[Explanation of symbols]

 1 data conversion circuit 11 conversion unit 12 reception start detection unit 13 output unit S1 transmission data S2 information wave Vd power supply

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Tomoki Kubota 1-13-8 Kamikizaki, Urawa-shi, Saitama Japan Signaling Co., Ltd.

Claims (5)

[Claims] 1. A transponder including a data conversion circuit, wherein the data conversion circuit converts the input transmission data into information waves having different frequencies, and the first transmission data after the power is supplied and activated. A transponder that stops transmitting the information wave until is supplied. 2. The transponder according to claim 1, wherein the data conversion circuit includes a conversion unit, a reception start detection unit, and
And an output unit, the conversion unit is for converting the transmission data into the information wave, the reception start detection unit, after the power is supplied, the first transmission data is supplied. In this case, the output unit outputs the output enable signal, and the output unit receives the information wave and the output enable signal, and transmits the information wave when the output enable signal is supplied. 3. The transponder according to claim 1, wherein the data conversion circuit includes a reception start detection unit, a conversion unit, and
An output unit, the reception start detection unit outputs an output enable signal when the first transmission data is supplied after power is supplied, and the conversion unit is Convert the transmitted data to the information wave,
A transponder that outputs the information wave when the output enable signal is supplied, and the output unit transmits the input information wave. 4. The transponder according to claim 1, wherein the transmission data is given by polling of a processing device having jurisdiction over the transponder. 5. The transponder according to claim 1, wherein the transmission data is input by being superimposed on the power source.