CN209787185U - Communication safety monitoring system - Google Patents

Abstract

The utility model discloses a communication safety monitoring system, which comprises a frequency acquisition circuit, a separation calibration circuit and a filter transmission circuit. Receive the output signal of the frequency acquisition circuit in two ways, one way uses the operational amplifier AR1 to amplify in phase, and the second way uses the thyristor VTL1 and the voltage regulator D4 to form a compound circuit to screen the high-level signal as the base potential of the triode Q2, and the triode Q2, Transistor Q1 forms a switch circuit to detect the potential difference between the two signals, and finally the filtering and transmitting circuit uses inductance L4, capacitor C4, and capacitor C5 to form a π-type filter circuit for filtering, and sends it to the remote control terminal through the signal transmitter E1, which can convert the frequency signal It is the calibration signal of the remote control terminal.

Description

A communication security monitoring system

technical field

The utility model relates to the technical field of circuits, in particular to a communication safety monitoring system.

Background technique

At present, with the continuous development of science and technology, the communication technology is also developing more and more. The communication safety monitoring system mainly includes the remote control terminal, the signal transmission module and the signal acquisition module. After the communication signal is modulated, it needs to be sent to the remote control terminal through the signal transmission module. , in order to prevent frequency hopping and signal attenuation problems during signal transmission, it is necessary to monitor the signal in real time, so that the remote control terminal can analyze the received signal more accurately.

Utility model content

In view of the above situation, in order to overcome the defects of the prior art, the purpose of this utility model is to provide a communication safety monitoring system, which can detect the signal at the input end of the analog signal transmission channel in the communication safety monitoring system in real time, and simultaneously convert the frequency signal into remote Calibration signal from the control terminal.

The technical solution it solves is: a communication safety monitoring system, including a frequency acquisition circuit, a separation calibration circuit and a filter transmission circuit. The frequency acquisition circuit collects the signal at the input end of the analog signal transmission channel in the communication safety monitoring system. The transmission channel is the channel used by the control terminal of the communication safety monitoring system to receive the modulated analog signal. The separation and calibration circuit is divided into two channels to receive the output signal of the frequency acquisition circuit. , Zener tube D4 forms a composite circuit to screen high-level signals as the base potential of triode Q2, and triode Q2 and triode Q1 form a switch circuit to detect the potential difference between the two signals, and finally the filtering and transmitting circuit uses inductor L4 and capacitor C4, capacitor C5 Form a π-type filter circuit for filtering, and send it to the remote control terminal through the signal transmitter E1;

The separation calibration circuit includes a diode D2, the anode of the diode D2 is connected to the anode of the diode D3, the cathode of the diode D2 is connected to one end of the resistor R2, and the other end of the resistor R2 is connected to the cathode of the voltage regulator tube D4 and the anode of the thyristor VTL1, which can be The control pole of the silicon controlled rectifier VTL1 is connected to the positive pole of the voltage regulator tube D4 and one end of the resistor R3 and the capacitor C4, the other end of the resistor R3 and the capacitor C4 is grounded, the negative pole of the thyristor VTL1 is connected to one end of the resistor R4, and the other end of the resistor R4 is connected to The base of the transistor Q2, the cathode of the diode D3 are connected to the non-inverting input terminal of the operational amplifier AR1 and one end of the resistor R5, the inverting input terminal of the operational amplifier AR1 is grounded, and the output terminal of the operational amplifier AR1 is connected to the other end of the resistor R5 and The base of the transistor Q1, the emitter of the transistor Q2, the emitter of the transistor Q1 is connected to one end of the resistor R7, the other end of the resistor R7 is grounded, the collector of the transistor Q1 is connected to one end of the resistor R6 and the collector of the transistor Q2.

Through above technical scheme, the beneficial effect of the utility model is:

1. Use the operational amplifier AR1 to amplify in phase, amplify the signal power, and ensure the turn-on voltage strength of the trigger transistor Q2 and transistor Q1. The second circuit uses the thyristor VTL1 and the voltage regulator tube D4 to form a composite circuit to screen the high-level signal for the transistor Q2. The base potential, using the switching properties of the thyristor VTL1, judges whether the potential of the output signal of the frequency acquisition circuit is abnormal. In order to further ensure the accuracy of the detection signal and prevent errors, a switching circuit composed of triode Q2 and triode Q1 is used to detect the two signals. Potential difference, use the potential difference of the two signals to further judge whether the output signal of the frequency acquisition circuit is abnormal. When the signal is abnormal, it is a high-level signal, which triggers the switch circuit composed of the triode Q2 and the triode Q1 to conduct, otherwise it does not conduct, and realizes Accurate judgment of the signal in the analog signal transmission channel in the communication safety monitoring system.

Description of drawings

Fig. 1 is the circuit schematic diagram of the utility model.

Detailed ways

The aforementioned and other technical contents, features and effects of the present utility model will be clearly presented in the following detailed description of the embodiment with reference to the accompanying drawing 1 . The structural contents mentioned in the following embodiments are all based on the accompanying drawings of the description.

Various exemplary embodiments of the present utility model will be described below with reference to the accompanying drawings.

Embodiment 1, a communication safety monitoring system, including a frequency acquisition circuit, a separation calibration circuit and a filter transmission circuit, the frequency acquisition circuit collects the signal at the input end of the analog signal transmission channel in the communication safety monitoring system, and the analog signal transmission channel is The communication safety monitoring system control terminal is used to receive the modulated analog signal. The separation and calibration circuit is divided into two channels to receive the output signal of the frequency acquisition circuit. The tube D4 forms a compound circuit to screen the high-level signal as the base potential of the triode Q2, and the triode Q2 and the triode Q1 form a switch circuit to detect the potential difference between the two signals, and finally the filtering and transmitting circuit uses the inductor L4, capacitor C4, and capacitor C5 to form a π-type Filtered by the filter circuit and sent to the remote control terminal through the signal transmitter E1;

The separation and calibration circuit is divided into two ways to receive the output signal of the frequency acquisition circuit, one way uses the operational amplifier AR1 to amplify in phase, amplifies the signal power, and ensures the conduction voltage strength of the triode Q2 and the triode Q1, and the second way uses the thyristor VTL1, stabilizer The voltage tube D4 forms a composite circuit to screen the high-level signal as the base potential of the triode Q2. Using the switching properties of the thyristor VTL1, it is judged whether the potential of the output signal of the frequency acquisition circuit is abnormal. In order to further ensure the accuracy of the detection signal and prevent errors, Use the triode Q2 and triode Q1 to form a switch circuit to detect the potential difference of the two signals, and use the potential difference of the two signals to further judge whether the output signal of the frequency acquisition circuit is abnormal. When the signal is abnormal, it is a high-level signal, triggering the triode Q2, The triode Q1 forms a switch circuit that is turned on, otherwise it is not turned on, so as to realize the accurate judgment of the signal in the analog signal transmission channel in the communication safety monitoring system. The anode of the diode D2 is connected to the anode of the diode D3, and the cathode of the diode D2 is connected to one end of the resistor R2. The other end of the resistor R2 is connected to the negative pole of the voltage regulator tube D4 and the positive pole of the thyristor VTL1, and the control pole of the thyristor VTL1 is connected to the positive pole of the voltage regulator tube D4 and one end of the resistor R3 and the capacitor C4, and the other end of the resistor R3 and the capacitor C4 One end is grounded, the negative pole of the thyristor VTL1 is connected to one end of the resistor R4, the other end of the resistor R4 is connected to the base of the transistor Q2, the negative pole of the diode D3 is connected to the non-inverting input terminal of the op amp AR1 and one end of the resistor R5, and the op amp AR1 The inverting input of the transistor is grounded, the output terminal of the operational amplifier AR1 is connected to the other end of the resistor R5, the base of the transistor Q1, and the emitter of the transistor Q2, the emitter of the transistor Q1 is connected to one end of the resistor R7, and the other end of the resistor R7 is grounded , The collector of the transistor Q1 is connected to one end of the resistor R6 and the collector of the transistor Q2.

Embodiment 2, on the basis of Embodiment 1, the filter transmitting circuit uses the inductor L4, the capacitor C4, and the capacitor C5 to form a π-type filter circuit to filter, filter out signal clutter, and send it to the remote control terminal through the signal transmitter E1 , when the signal is abnormal, the remote control terminal can correct the error of the received signal in time, one end of the inductor L4 is connected to the other end of the resistor R6 and one end of the capacitor C4, the other end of the capacitor C4 is grounded, and the other end of the inductor L4 is connected to the resistor R8, one end of the capacitor C5, the other end of the capacitor C5 is grounded, and the other end of the resistor R8 is connected to the signal transmitter E1.

Embodiment three, on the basis of embodiment two, the frequency acquisition circuit selects the frequency acquisition device J1 model as SJ-ADC to collect the signal of the input end in the analog signal transmission channel in the communication safety monitoring system, and the power supply terminal of the frequency acquisition device J1 Connect one end of the capacitor C1 to the power supply +5V, the ground terminal of the frequency collector J1 is grounded, the output terminal of the frequency collector J1 is connected to the other end of the capacitor C1 and one end of the resistor R1, the negative pole of the regulator tube D1, and the terminal of the regulator tube D1 The positive pole is grounded, the other end of the resistor R1 is connected to one end of the capacitor C2 and the positive pole of the diode D2, and the other end of the capacitor C2 is grounded.

When the utility model is specifically used, a communication safety monitoring system includes a frequency acquisition circuit, a separation calibration circuit and a filter transmission circuit. The frequency acquisition circuit collects signals at the input terminals of the analog signal transmission channel in the communication safety monitoring system. The signal transmission channel is the channel used by the control terminal of the communication safety monitoring system to receive the modulated analog signal. The separation and calibration circuit is divided into two channels to receive the output signal of the frequency acquisition circuit. Transistor Q2, triode Q1 conduction voltage intensity, the second circuit uses thyristor VTL1, voltage regulator tube D4 to form a composite circuit to screen high-level signals as the base potential of triode Q2, and use the switching properties of thyristor VTL1 to judge frequency acquisition Whether the potential of the circuit output signal is abnormal, in order to further ensure the accuracy of the detection signal and prevent errors, a switch circuit composed of transistor Q2 and transistor Q1 is used to detect the potential difference between the two signals, and the potential difference between the two signals is used to further judge the frequency acquisition circuit. Whether the output signal is abnormal, when the signal is abnormal, it is a high-level signal, triggering the switch circuit composed of triode Q2 and triode Q1 to conduct, otherwise it will not conduct, so as to realize the accurate judgment of the signal in the analog signal transmission channel in the communication safety monitoring system, Finally, the filtering and transmitting circuit uses the inductance L4, the capacitor C4, and the capacitor C5 to form a π-type filter circuit for filtering, and sends it to the remote control terminal through the signal transmitter E1.

The above is a further detailed description of the utility model in conjunction with specific embodiments, and it cannot be determined that the specific implementation of the utility model is limited to this; Under the premise of the idea of the scheme, the expansion, operation method, and data replacement should all fall within the protection scope of the present utility model.

Claims (3)

1. A communication safety monitoring system comprises a frequency acquisition circuit, a separation calibration circuit and a filtering emission circuit, and is characterized in that: the frequency acquisition circuit acquires signals of an input end in an analog signal transmission channel in the communication safety monitoring system, the analog signal transmission channel is used for receiving modulated analog signals by a control terminal of the communication safety monitoring system, the separation calibration circuit receives the signals output by the frequency acquisition circuit in two paths, one path of the signals is amplified in phase by an operational amplifier AR1, the other path of the signals is filtered by a composite circuit consisting of a silicon controlled rectifier VTL1 and a voltage regulator tube D4 to obtain a base potential of a triode Q2, a switching circuit consisting of a triode Q2 and a triode Q1 is used for detecting potential differences of the two paths of signals, and finally, a filter emission circuit uses an inductor L4, a capacitor C4 and a capacitor C5 to form a pi-shaped filter circuit for filtering and sends the filtered signals to a remote control terminal through a signal emitter;

The separate calibration circuit comprises a diode D2, the anode of a diode D2 is connected with the anode of a diode D3, the cathode of a diode D2 is connected with one end of a resistor R2, the other end of the resistor R2 is connected with the cathode of a voltage regulator tube D4 and the anode of a thyristor VTL1, the control electrode of the controlled silicon VTL1 is connected with the anode of a voltage regulator tube D4, one end of a resistor R3 and one end of a capacitor C4, the other ends of the resistor R3 and the capacitor C4 are grounded, the negative electrode of the controlled silicon VTL1 is connected with one end of a resistor R4, the other end of the resistor R4 is connected with the base electrode of a triode Q2, the negative electrode of a diode D3 is connected with the non-inverting input end of an amplifier AR1 and one end of a resistor R5, the inverting input end of an amplifier AR1 is grounded, the output end of the amplifier AR1 is connected with the other end of a resistor R5, the base electrode of a triode Q1 and the emitter electrode of a triode Q2, the emitter electrode of a triode Q1 is connected with one end of a resistor R7, the other end of a resistor R7 is grounded, and the collector electrode of a triode Q1 is connected with one end of a resistor.

2. A communication security monitoring system according to claim 1, characterized in that: the filter transmitting circuit comprises an inductor L4, one end of the inductor L4 is connected with the other end of a resistor R6 and one end of a capacitor C4, the other end of the capacitor C4 is grounded, the other end of the inductor L4 is connected with one end of a resistor R8 and one end of a capacitor C5, the other end of the capacitor C5 is grounded, and the other end of the resistor R8 is connected with a signal transmitter E1.

3. A communication security monitoring system according to claim 2, characterized in that: the frequency acquisition circuit comprises a frequency collector J1 with the model of SJ-ADC, a power supply of the frequency collector J1 is connected with one end of a capacitor C1 and a power supply +5V, the grounding end of the frequency collector J1 is grounded, the output end of the frequency collector J1 is connected with the other end of the capacitor C1, one end of a resistor R1 and the cathode of a voltage regulator tube D1, the anode of the voltage regulator tube D1 is grounded, the other end of the resistor R1 is connected with one end of the capacitor C2 and the anode of a diode D2, and the other end of the capacitor C2 is grounded.