JPS6024738A - Remote supervisory and controlling equipment - Google Patents

Abstract

PURPOSE:To prevent transfer efficiency from decrease in the case of low line frequency by synthesizing communication sound signals, monitor FSK signals and squelch signals, and transmitting the synthesized signal through one channel. CONSTITUTION:The station code transmission circuit 1 at a monitor station transmits the station code signal of the distant station to be monitored. Before the monitor signal transmission/recept circuit 2 transmits a monitor signal to the FSK signal modulation circuit 3, the circuit 2 relays and sends the station code signal and code signal by communication and transmits them. On the other hand, the synthesizing circuit 4 synthesizes the squelch signal f1 from the squelch signal transmission circuit 5, FSK signal f3 from the FSK signal modulation circuit 3 and sound signal fv from the transmission/recept circuit 6, and supplies the synthesized signal to the transmission/recept circuit 16. This circuit 16 transmits the synthesized signal into the air through the antenna 7 by using the radio call channel A. The receiving side demultiplexes 3 kinds of signals through the demultiplexing circuit 8 and leads the demultiplexed signals to the prescribed utilizing circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a remote monitoring and control device, and more particularly to a remote monitoring and control device that uses a satellite communication communication channel between one monitoring station and a plurality of monitored stations.

Conventionally, this type of remote monitoring and control equipment using satellite communication uses one communication channel for calls and one communication channel for monitoring signals.
As shown in Figure 1(a), 300~2,700Hz
3y825Hz squelch signal f1 to the audio signal fv
As shown in FIG. 1(b), a composite signal of 1t800 is placed on the monitoring signal wireless communication channel.
3 e 8 to 4-phase PSK signal f2 with Hz as carrier wave
2! ; Used with a composite signal superimposed on the Hz squelch signal f8.

Therefore, the monitoring station and each monitored station are independently provided with a communication system device and a monitoring signal system device, and correspondingly, a communication station code transmitting/receiving circuit and a monitoring signal station code transmitting/receiving circuit are required. Squelch signal transmitting/receiving circuits are also required for both systems.

Although such a configuration has the advantage of being able to communicate telephone calls and monitoring signals independently, it also has the disadvantage that the amount of communication is small (in some cases, the structure becomes large and expensive). .

SUMMARY OF THE INVENTION An object of the present invention is to eliminate such disadvantages and to provide an economical remote monitoring and control device that requires a small amount of communication and is not large in structure.

The configuration of the present invention provides a remote monitoring and control device that uses satellite communication to exchange telephone calls and monitoring signals between one monitoring station and a plurality of monitored stations, in which a digital signal including a station code signal and a communication type code signal is used. A modulating means for converting a monitoring signal into a narrowband analog signal, a synthesizing means for synthesizing the output signal from the modulating means, an audio signal, and a squelch signal, and using the output signal from the synthesizing means on a set communication channel. a transmitting means for transmitting the same, a receiving means for receiving a communication channel set separately from the above, and a demultiplexing means for demultiplexing the output of the receiving means into a narrowband analog signal, an audio signal and a squelch signal; It is characterized by including demodulation means for converting the narrowband analog signal obtained from the demultiplexing means into a station code signal and a communication type code signal into a digital supervisory signal.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 2 is a frequency allocation diagram showing an example of a composite signal carried on a communication channel used in the present invention.

In the present invention, signals for communication and monitoring signals and squelch signals are combined to create one composite signal,
This system uses one communication channel.

This composite signal is assumed to be an audio signal fv as shown in the figure.'C3
00 to 2,700Hz, 3.280±30Hz as signal f3 to F8 such as station code signal and monitoring signal, 3.280±30Hz as squelch signal f8. ．． 825 Hz is assigned to each.

FIG. 3 is a block diagram showing one embodiment of the present invention, in which the same configuration is used for the monitoring station and all monitored stations. In the figure, a station code sending circuit 1 sends a station code signal for both the monitoring station and the monitored station to the monitoring signal transmitting/receiving circuit 2, and a communication type code signal that specifies whether the communication is a telephone conversation or a monitoring signal. The code sending circuit 1 sends out the station code signal of the monitored station with which communication is to be made, and the station code sending circuit 1 of the monitored station always sends out the station code signal of its own station. Furthermore, before sending the monitoring signal to the FSX signal modulation circuit 3, the monitoring signal transmitting/receiving circuit 2 relays and sends out the station code signal and the communication type code signal.

On the other hand, the synthesis circuit 4 receives the input signals of the squelch signal f1 sent out from the squelch signal sending circuit, the FSK signal f sent out from the FSK signal modulation circuit 3, and the audio signal fv from the transmitting/receiving circuit. The combined signal is combined with a signal having the frequency arrangement explained in Figure 2 and sent to the transmitting/receiving circuit 6.The transmitting/receiving circuit 6 transmits this combined signal from the antenna 7 using the wireless communication channel A.

Further, this antenna 7 receives the wireless communication channel B transmitted from the other party's station, and sends this signal to the transmitting/receiving circuit 6. This transmitter/receiver circuit 6 demodulates the communication channel B, extracts a composite signal, and sends it to the demultiplexer circuit 8. This branching circuit 8 converts this composite signal into a squelch signal f, and audio signals fv and F.
Separated into S K signal f3. This squelch signal f1 is detected by the squelch signal receiving circuit 9 and ignites the rung 1O to notify that the other station is transmitting the wireless communication channel B. Further, the audio signal fv is sent to the transmitting/receiving circuit 6. On the other hand, the signal f3 at F8 is sent to the FSK demodulation circuit 1], and the demodulated signal is sent to the supervisory signal transmission/reception circuit '#52.

The station code receiving circuit 12 connected to the supervisory signal transmitting/receiving circuit 2 detects the station code and the communication type code from the first sent demodulated signal.

In this case, if the own station is a monitoring station, the station code receiving circuit 12 detects the station code signal of the monitored station, and lights the lamp corresponding to this station code among the lamps 13 provided for the monitored station. Inform the monitored station name. If the own station is the monitored station, the station code receiving circuit 12ii' detects whether the station code signal of the own station has been sent;
lights up. In addition, the station code receiving circuit 12 of both the monitoring station and the monitored station also detects a communication type code signal, and if communication by telephone is specified, the buzzer 14 sounds to notify the maintenance person.

The monitoring transmitting/receiving circuit 2 is set to carry out the conventional monitoring control operation regarding the human output of monitoring signals other than the station code signal and the communication type code signal. Further, at the station where the buzzer 14 has sounded in response to the communication type code, the maintenance person activates the transmission system of his own station according to the procedure described above, and starts communication with the other party's maintenance person.

As described above in detail, according to the present invention, the voice signal for telephone calls, the FSX signal for supervisory signals, and the squelch signal are combined and placed on the same telephone channel, and the station code signal for telephone calls is combined with the station code signal for supervisory signals. This has the effect of making it possible to economically construct a remote monitoring and control device used in cases where communication frequency is high.

[Brief explanation of the drawing]

FIGS. 1(a) and (b) are frequency allocation diagrams of a composite signal on a communication channel used in a conventional remote monitoring and control device, and FIG. 2 is a diagram of a composite signal on a communication channel used in an embodiment of the present invention. FIG. 3 is a block diagram of an embodiment of the present invention. In the figure, 1... Station code sending circuit, 2... Supervisor, signal transmitting/receiving circuit, 3... Signal modulation circuit at F8, 4... Synthesizing circuit. , 5-... Squelch signal sending circuit, 6... Transmitting/receiving circuit, 7......
Antenna, 8... Branching circuit, 9... Squelch signal receiving circuit, 10... Lamp, 1]...F
SK signal demodulation circuit, 12...- Station code receiving circuit, 13... Lamp, 14... Buzzer,
f□...Squelch signal, f2...4-phase PSK signal carrier, f,...Signal at F8, fv
...It is an audio signal. 7, 111) σ, 3. zis Hz f2 ft th ? Charming horse, j

Claims (1)

[Claims] In a remote monitoring control device that uses satellite communication to communicate calls and monitoring signals between one monitoring station and multiple monitored stations, digital monitoring signals including station code signals and communication type code signals are transmitted in a narrow band. A modulating means for converting into an analog signal, a synthesizing means for synthesizing the output signal from the modulating means, an audio signal, and a squelch signal, and a transmission for transmitting the output signal from the synthesizing means using a set communication channel. a receiving means for receiving a communication channel set separately from the receiving means; a branching means for branching the output signal of the receiving means into a narrowband analog signal, an audio signal, and a squelch signal; and the branching means. 1. A remote monitoring and control device comprising: demodulation means for converting a narrowband analog signal obtained from a station code signal into a digital monitoring signal including a station code signal and a communication type code signal.