JPS6012821B2 - alarm transceiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mobile body alarm transceiver that transmits and receives warnings to and from a mobile body such as a train in an emergency, and particularly relates to a failure detection method thereof.

[Prior Art] Generally, a moving object such as a train is equipped with an alarm transmitter/receiver for transmitting or receiving an alarm indicating that there is an abnormality on a track or the like.

Conventionally, when testing the operation of such a warning transceiver, the crew member presses a test button at the time of departure to operate the transceiver circuit except for the transmitting power increasing section, and the information radio waves leaking from the pre-transmission section are transferred to the own receiver. It was used as a test to confirm the operation of the alarm transceiver, including a reception sensitivity test. The reason why the transmitting power increasing part is not operated is that if the transmitting power increasing part is operated, its output will leak at the transmitting/receiving bond switching section, etc., and false alarm radio waves from the antenna will be reflected. . [Problem that the invention seeks to solve] However,
The above-mentioned conventional system also has drawbacks, such as the possibility of emitting weak warning radio waves and giving false warnings to nearby trains, and the conventional system not being able to detect failures in the power booster.

In addition, in a system that operates including a power booster, in order to perform a reception sensitivity test without emitting false warning radio waves as described above, the coupling attenuation from the transmitter to the receiver must be 10 or more compared to the old model. also required. However, it is extremely difficult to fabricate a shield box for the transmitter for this purpose, and it is also necessary to fabricate a high-frequency switch to ensure coupling attenuation from the transmitter to the antenna so as not to give false alarms to nearby trains. is also very difficult. As mentioned above, with the conventional method, it is not possible to test the operation of the power booster, and there is no way for the train crew to know if the transmitter/receiver is malfunctioning while the train is moving, resulting in operational problems such as cases where the function cannot be performed during emergency suction. It had a flaw that could be called fatal.

It is also possible to use intermittent transmission, that is, to check the operation by mirroring alarm radio waves to the outside for a certain short period of time.
This type of system is undesirable when a large number of trains are concentrated, as the signals from each train may be combined to give false warnings to other trains, or may interfere with the reception of warning radio waves arriving from far away. . This invention was made in order to solve the above-mentioned drawbacks, and it is possible to inform the train crew of the normality or failure of equipment including the transmitting power increasing part even when the train is moving, and also to give a false alarm to nearby trains. To provide a fearless and inexpensive alarm transmitter/receiver.

[Means for solving problems]

The alarm transmitter/receiver according to the present invention has a transmitting section that operates continuously or intermittently, and a modulation circuit increasing section and a power increasing section of the transmitting section during intermittent transmission. a receiver unit that receives an external alarm and a leakage signal from the modulation multiplier, a detection unit that receives the alarm and detects whether or not there is an abnormality in the alarm transmitter/receiver, and an alarm receiver. and display means for displaying the status and the presence or absence of an abnormality.

[Effect]

In this invention, each of the modulation multiplication part and the power multiplication part of the transmitting section is operated intermittently at a specific cycle, and when only the modulation multiplication part is operating, a modulation signal is given to the modulation part, and both of the abovementioned multiplication parts are When the central section is in operation, the modulation signal to the modulation and multiplication section is cut off, and the test signal obtained from the transmitting section determines and displays whether the transmitter/receiver is normal or malfunctioning.

〔Example〕

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

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a waveform showing an output waveform of a designated portion in FIG. 1st
In the figure, 1 is a crystal resonator, 2 is an oscillation circuit, 3 is a modulation circuit, 4 is a frequency multiplication circuit, and 5 is an output coupler, and these constitute a modulation amplification circuit of the transmitter.

6 is a power increasing circuit of the transmitting section.

Further, 15 is a power switch, 17 is an intermittent transmission circuit for intermittently supplying power to the transmitting section, 16 is an alarm transmission switch for continuously supplying power to the consignment bond section for transmitting alarms, and 18 is an alarm signal oscillator, 19 inputs the output of the intermittent transmission circuit 17 and the output of the alarm signal oscillator 18, and among the synchronization of the output n of the intermittent transmission circuit 17, (n-1)31 This is a control switch (transmission control means) that operates at a specific frequency, and provides a power supply and an alarm signal to each of the modulation boost circuit and power boost circuit 6 at a specific cycle. 19-1, 19-2 are control switches 1
9 control line.

7 is a transmission output detection circuit (transmission level detection means) for detecting whether the transmission output of the power increasing circuit 6 is above a certain value, 8 is a transmission/reception switch, and 9 is an antenna.

In addition, 1 is an input coupler, 11 is a receiver, 12 is an alarm signal receiver, 13 is a first timer (leakage signal detection means) for detecting equipment normality, and 14 is for detecting reception of an alarm signal from the outside. This is a second timer (alarm detection means) for this purpose, and the rising time constant of this timer is set to be sufficiently larger than that of the first timer 13. 20' receives the outputs from the transmission output detection circuit 7, the first and second timers 13, 14, and the control switch 9 to determine whether the equipment is normal or not, and also detects an external alarm. Logic circuits for detecting signal reception; 21 and 22 are oscillators and lamps for notifying equipment normality; 23 and 24 are oscillators and lamps for notifying equipment failure; 25 and 26 are each for notifying alarm signal reception. 27 is an oscillator and a lamp, and 27 is a speaker.

Note that 26 is a shield box that sufficiently shields radio waves, and houses the modulation multiplication part of the transmitting part. Here, the output coupler 5, input coupler 10, and shield box 28 can be omitted depending on the design.

The control lines 19-1 of the intermittent transmission circuit 17 and the control switch 19 shown in Fig. 1 are shown in Fig. 2, respectively.
, 19-2, the output waveforms of the transmission output detection circuit 7 and the first and second timers 13 and 14 are shown.

Time T in FIG. 2 indicates the rise time of the second timer. Next, the operation will be explained.

There are four status indications of the Z device: normal, failure, alarm signal, and alarm reception, and the details will be explained using FIGS. 1 and 2. Power switch 15
, the intermittent transmitting circuit 17 operates intermittently at a constant cycle as shown in FIG.

Therefore, voltage is supplied to the modulation booster circuit at a constant cycle as shown in FIG. 2A. and the control switch 19 is the second
As shown in the figure, voltage is supplied to the 2-power increase circuit 6 only once every n periods of intermittent transmission, and at this time, the alarm signal supplied to the modulation circuit 3 is cut off (see FIG. 2C). Therefore,
At this point, the power increase circuit 6 outputs an unmodulated signal that is not modulated by the alarm signal. This output is detected by the transmission output detection circuit 7, and if the signal level is above a certain value, it passes through the logic circuit 20 and drives the oscillator 21 and lamp 22 indicating that the device is normal. On the other hand, if the signal level of the entrusted transmission output is below a certain value, the logic circuit 2
The controller drives the oscillator 23 and lamp 24 indicating equipment failure to notify the equipment failure. Furthermore, as shown in FIG. 2C, the control switch 19 supplies an alarm signal to the modulation circuit 3 (n-1) times out of n periods of intermittent transmission, and controls not to supply voltage to the power increase circuit 6. The modulation output from the frequency distribution circuit 4 passes through the output coupler 5, the input coupler 10, and is demodulated by the receiver 11. After detection by the alarm signal receiver 12, the first timer detects whether the equipment is normal. Operate 13.

In this case, the oscillator 21 and lamp 22 are driven through the logic circuit 20 to notify that the four devices are normal, but if the first timer 13 that detects the device normality does not operate due to a malfunction, the logic circuit 20G or The device failure oscillator 23 and lamp 24 are driven to notify the device failure. Next, when an abnormality is discovered while the train is moving, the alarm transmission switch 16 is turned on.

Then, voltage is continuously supplied to the control switch 19 via the switch 16, thereby continuously supplying voltage to the power increase circuit 6, continuously supplying an alarm signal to the modulation circuit 3, and controlling the transmission/reception changeover switch 8. By switching the signal to the power increasing circuit 6 side, radio waves modulated with the alarm signal are emitted from the antenna 9 to the outside, and the alarm is notified to other trains. In addition, in the case of receiving warning radio waves from other trains, antenna 9
The signal passes through the transmission/reception selector switch 8, passes through the input coupler 10, is demodulated by the receiver 11, is detected by the alarm signal receiver 12, operates the second timer 14 that detects alarm reception, and passes through the logic circuit 20 to generate the alarm. The oscillator 25 and lamp 26 are driven to notify the reception of the alarm.

At this time, since the rising time constant of the second timer 14 is set sufficiently larger than that of the first timer 3, the reception of the alarm is displayed only when the continuously transmitted alarm signal is received. In this way, in this embodiment, the modulation boosting circuit and the power boosting circuit 6 of the transmitting section are operated intermittently at specific cycles, so that the power boosting circuit can be operated without giving a false alarm to other trains. It is possible to check the operation of equipment including 6.

Furthermore, it is possible to receive warning radio waves arriving from a distance without interfering with the own transmitted waves. That is, only the modulation multiplier circuit is operated intermittently, and the modulated output from the frequency multiplier circuit 4 is routed to its own receiving section, thereby making it possible to conduct an operation test including a receiving sensitivity test.

Here, even if another train is conducting such an operation test, since the rise time constant of the second timer 14 is set sufficiently large in this device, the intermittent operation test from the other train will be performed. A false alarm signal will not result in false alarm reception. Furthermore, the transmission power increasing circuit 6 is operated only once every n periods of intermittent transmission to judge the quality of its transmission output, but at this time no modulation signal is supplied to the modulation circuit 3. The radio waves leaked from the switch 8 and emitted from the antenna 9 are unmodulated signals, and therefore do not give false information to other trains. In addition, even if there is short-term interference only 11 times in n periods of intermittent transmission when the alarm radio wave is received by the receiver 11 from a distance, there will be an intermittent (pause) period of n times during which the alarm signal can be detected. Therefore, the alarm signal can be received correctly during this time period.

Furthermore, as mentioned above, (n-1) times out of n cycles, the quality of the equipment is judged except for the power increase circuit 6, but at this time as well, there is an intermittent signal that can detect an external alarm signal. (
During this period, warning signals from other trains can be received correctly. Although the above embodiment has been explained using a train as an example, it can also be used for emergency warning communication on express buses and the like.

〔Effect of the invention〕

As described above, according to the alarm transceiver according to the present invention,
Since the modulation booster and power booster in the transmitter are operated intermittently at specific intervals, it is possible to test the operation of equipment including the power booster without giving false alarms to other mobile units. It is easy to perform, and the operation test can be automatically performed at regular intervals, which has the effect of greatly increasing the reliability of the equipment.

Further, the alarm transmitter/receiver according to the present invention does not interfere with the reception of alarm radio waves, and can be used for purposes such as emergency stopping of trains, etc., and is extremely effective.

[Brief explanation of drawings]

FIG. 0 is a block diagram of an alarm transmitter/receiver according to an embodiment of the present invention, and FIG. 2 is a waveform diagram showing output waveforms of specified portions in FIG. 1. 1... Crystal resonator, 2... Oscillation circuit,
3...Modulation circuit, 4...Frequency multiplier circuit,
6...Power increase circuit, 7...Transmission output detection circuit, 1
1... Receiver, 12... Alarm signal receiver,
13...First timer, 14...Second timer, 17...Intermittent transmission circuit, 18...
・Alarm signal oscillator, 19...control switch, 20...
...Logic circuit, 21, 22, 25... Oscillator, 22, 24, 25... Hump. Figure 1 Figure 2

Claims (1)

[Claims] 1. A transmitting section consisting of a modulation amplifying section and a power amplifying section that transmits an alarm signal continuously or intermittently, and a means for controlling transmission of the transmitting section, which controls the power amplifying section during intermittent transmission. gives power only m times out of the n periods of intermittent transmission, and applies power only to the modulation amplifying section for the m times, and supplies power and modulation signal to the modulation amplification section for the remaining (n-m) periods of the intermittent transmission. transmission control means for giving a certain alarm signal; transmission level detection means for detecting the level of the transmission output of the transmitter; and transmitting an alarm from the outside, and the modulation amplification section for the (n-m) period. a receiver for receiving a leakage signal from the receiver; a leakage signal detection means for detecting the leakage signal from the receiver; and an alarm for detecting the alarm signal from the outside, the alarm having a rise time constant that does not detect the intermittent transmission signal. a detection means; and a display means for displaying the alarm reception state according to the detection result of the alarm detection means, the transmission level, and the presence or absence of an abnormality of the alarm transceiver according to the detection result of the leakage signal detection means. An alarm transceiver characterized by: