JPH0326694Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is a simulator that can be incorporated into a normal SSB transmitter to send out signals that simulate wireless telephone telegraph signals in the real air, thereby training the reception of wireless communications. Regarding.

(Prior Art) Conventionally, when trying to obtain a transmission output with a predetermined S/N for the purpose of noise simulation in wireless communication, in the case of a wireless telephone, the microphone 13 and There is a method in which the outputs of the noise generator 14 are combined by a combiner 15 and the SSB transmitter 16 is modulated. Furthermore, wireless telegraphy was carried out by using a noise transmitter and a telegraph transmitter and combining their outputs.

(Problem that the invention attempts to solve) However, the method of using a noise generator and a microphone is to switch the microphone 13 to SSB.
Since the transmission output of the transmitter 16 is keyed,
As shown in FIG. 5, the continuous noise (A) is also intermittent and becomes like the transmitter output (D), which does not simulate the real sky.
Although the telegraph example described above can obtain a desired simulated signal, it has problems such as the need for two expensive transmitters.

(Means for Solving the Problems) In order to solve these drawbacks, the present invention uses a single transmitter to superimpose a Morse code on continuous noise or a voice signal on continuous noise and transmit it. When this is received, training can be performed in a state similar to that of actual communication, which will be explained in detail below with reference to the drawings.

(Example) Fig. 1 shows the basic configuration of the present invention, in which 1 is a modulation signal switching circuit, 2 is a noise generation circuit, 3 is a carrier keying circuit, 4 is an SSB modulation circuit (hereinafter referred to as a modulation circuit), 5 is a band pass filter, 6 is a high frequency amplification circuit, 7 is a carrier wave addition circuit, and 8 is a keying circuit.

In the above configuration, 1 to 3 are circuits according to the present invention, and 4 to 8 are existing circuits of the SSB transmitter. Therefore, the device of the present invention can be used by being installed between a microphone or a key and the modulation circuit 4 without changing the circuit system of a normal SSB transmitter.

To operate this, the modulation signal switching circuit 1 must be
By switching S1 to the ON side and keying the transmitter, the output of the noise generation circuit 2 (Fig. 2 A) is added to the modulation input of the modulation circuit 4 at the same time, so that the output of the transmitter is always modulated by noise. A high frequency signal is obtained.

When S2 of the modulation signal switching circuit 1 is switched to the telephone side in this state, the microphone is connected to the modulation circuit 4 and the carrier keying circuit 3 is cut off. Therefore, if an audio signal (Fig. 2 c) that is continuous or interrupted by a microphone switch (Fig. 2 b) is applied to the modulation signal switching circuit 1, a high frequency signal in which the audio signal is superimposed on continuous noise is obtained as an output. (Figure 2 D).

When the modulation signal switching circuit 1 is switched to the telegraph side, the microphone is cut off and the carrier keying circuit 3 is connected to the telephone key. Therefore, by keying the carrier wave with an electric key in the carrier keying circuit 3 (Fig. 2 B), a high-frequency signal in which a carrier wave (Morse code) interrupted by an electric key is superimposed on continuous noise is obtained as an output (Fig. 2B). Figure 2 E).

With the above-described examples of telephone and telegraph, it is possible to obtain signals that are close to actual communications and include noise in the real world, making it possible to simulate noise in wireless communications training.

Figure 3 shows an example in which the present invention is applied to a simulation system; 9 is an SSB transmitter built into the device;
10 is a high frequency attenuator, 11 is a remote control console (hereinafter referred to as a control console) for this apparatus, and 12 is a receiver. This example is a wireless telegraph/telephone line simulation system for radio operator training. 9 to 12 pieces of equipment are installed in the instructor's room, and the instructor controls the transmitter 9 using the control console 11 and transmits its output. Add to attenuator 10. This attenuator 10 attenuates the transmitter output to a suitable level as a receiver input and applies it to a receiver 12 installed in the classroom.

Such a system allows instructors to select any S/
It is possible to set up N's wireless telegraph and telephone lines and conduct reception training for radio operators.

(Effect of the invention) As explained above, the device of the invention can easily perform SSB.
It can be built into a transmitter, and the noise can be superimposed on the voice signal or Morse code and sent out continuously regardless of whether the microphone switch or telephone key is turned on or off, so it is a signal that closely approximates the wireless communication signal in the real world. can be obtained.

Therefore, it is extremely suitable as a noise simulation device for wireless communication training by varying the S/N ratio.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the present invention, Fig. 2 is an explanatory diagram of Fig. 1, Fig. 3 is an explanatory diagram of the device of the present invention applied to a simulation system for wireless communication training, and Fig. 4 is a conventional device. FIG. 5 is an explanatory diagram of FIG. 4. 1...Modulation signal switching circuit, 2...Noise generation circuit, 3...Carrier keying circuit, 4...SSB modulation circuit.

Claims (1)

[Scope of utility model registration request] The transmitter 9 is placed in front of the modulation circuit 4 of the SSB transmitter 9.
A modulation signal switching circuit 1 performs keying, and a noise generation circuit 2 continuously modulates a carrier wave by the modulation circuit 4 via the modulation signal switching circuit 1. simulate a wireless telephone signal in the real sky by adding an intermittent audio signal to the signal output obtained from the transmitter 9;
In addition, a carrier keying circuit 3 for directly keying a carrier wave is provided, and the output of the carrier keying circuit 3 and the continuous noise modulated wave output obtained from the output of the noise signal generation circuit 2 are superimposed to generate a wireless signal in the real sky. A noise simulation device characterized by being configured to simulate a telegraph signal.