CN113179395B - Camera remote monitoring video transmission device - Google Patents
Camera remote monitoring video transmission device Download PDFInfo
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- CN113179395B CN113179395B CN202110479632.0A CN202110479632A CN113179395B CN 113179395 B CN113179395 B CN 113179395B CN 202110479632 A CN202110479632 A CN 202110479632A CN 113179395 B CN113179395 B CN 113179395B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
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Abstract
The invention discloses a camera remote monitoring video transmission device, which effectively solves the problem that the phenomena of 'cross passage', 'ripple' or an array disordered flying spot and the like existing in a monitoring video image of an elevator car cannot be completely eliminated due to the complex electromagnetic environment in the prior art.
Description
Technical Field
The invention relates to the field of cameras, in particular to a camera remote monitoring video transmission device.
Background
In recent years, with the development of internet and the construction requirements of monitoring projects such as smart cities, security, finance, road traffic and electric power, a remote monitoring video technology using a camera has become an indispensable part of people's work and life. However, in the practical use process in an office building, it is found that after a monitoring signal acquired by a signal acquisition module transmitted by a signal transmission module, such as a camera, is analyzed and displayed in a monitoring center, it is found that the displayed image is mixed with disordered 'cross roads', 'ripples' or an array of disordered flying spots, thorns and linear interferences, and the problems of image blurring, distortion, jittering, rolling and the like are caused in serious cases, as shown in fig. 1, especially, the monitoring video transmitted by the camera of the elevator car is specially responsible for acquiring the monitoring video transmitted by the elevator car.
The prior art is for solving this problem, often consume the manpower and come to investigate camera and supporting facility, after guaranteeing that camera and supporting facility installation are errorless and standard, find the surveillance video image who is responsible for gathering the camera of elevator car specially because of electromagnetic environment is complicated, still there are mixed and disorderly phenomenons such as "cross walk", "ripple" or a matrix mixed and disorderly flying spot and can't eliminate, and other cameras are transmitted and come the surveillance video image in the hall of office building and then are recovered normally, this very big influence the staff to the surveillance video's of elevator car watch.
The present invention therefore provides a new solution to this problem.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a camera remote monitoring video transmission device, which effectively solves the problem that the phenomena of 'crosswalk', 'ripple' or a matrix of disordered flying spots and the like existing in a monitoring video image of an elevator car cannot be completely eliminated due to the complex electromagnetic environment in the prior art.
The technical scheme includes that the camera monitoring video remote transmission device comprises a signal acquisition module, a signal transmission module and a monitoring center, a signal push-pull circuit and a signal compensation circuit are further arranged between the signal transmission module and the monitoring center, a monitoring signal transmitted by the signal transmission module is received by the signal push-pull circuit through a push-pull device and is transmitted to the signal compensation circuit through a frequency selector, the monitoring signal is transmitted to a compensator by the signal compensation circuit through a calculator, and finally the monitoring signal is transmitted to the monitoring center.
Further, the signal push-pull circuit comprises a push-pull device and a frequency selector, the push-pull device receives the monitoring signal transmitted by the signal transmission module by using the push-pull device, the frequency selector selects the monitoring signal, and the selected monitoring signal is transmitted to the signal compensation circuit.
Further, the push-pull device comprises a capacitor C1, one end of the capacitor C1 is connected to the signal transmission module, the other end of the capacitor C1 is connected to the negative electrode of a voltage regulator D1, the anode of a thyristor Q1, the negative electrode of a diode D2 and the anode of a diode D3, the positive electrode of a voltage regulator D1 is connected to one end of a capacitor C2 and one end of a resistor R1 respectively, the control electrode of a thyristor Q1, the cathode of a thyristor Q1 is connected to signal ground, the negative electrode of a diode D2 is connected to one end of a resistor R3 and the base of a triode Q3 respectively, the collector of a triode Q3 is connected to the other end of a resistor R3, one end of a capacitor C3 and one end of a resistor R2 respectively, the other end of a resistor R2 is connected to a positive power source VCC, the emitter of a triode Q3 is connected to the emitter of a triode Q2, the base of a transistor Q2 is connected to one end of a resistor R4 and the cathode of a diode D3 respectively, and the collector of a resistor Q2 is connected to the other end of a resistor R4 respectively, The other end of the resistor R1, the other end of the capacitor C2, and the other end of the capacitor C3 are connected to ground.
Furthermore, the frequency selector comprises a resistor R5, one end of the resistor R5 is respectively connected with an emitter of a triode Q3 and an emitter of a triode Q2 in the push-pull device, the other end of the resistor R5 is connected with one end of a capacitor C4, the other end of the capacitor C4 is respectively connected with a non-inverting end of an operational amplifier U1B, one end of the resistor R6 and one end of a capacitor C5, an inverting end of the operational amplifier U1B is respectively connected with one end of a resistor R8 and one end of a resistor R7, an output end of the operational amplifier U1B is respectively connected with one end of a resistor R9 and the other end of a resistor R8, the grid of a field effect transistor Q4, the drain of a field effect transistor Q4 are respectively connected with one end of a resistor R9 and one end of a resistor R2 in the push-pull device, the source of the field effect transistor Q4 is respectively connected with one end of a resistor R11 and one end of a capacitor C6, the other end of the resistor R11 is respectively connected with the other end of the resistor R7, the other end of the capacitor C5, the other end of the resistor R6 and the collector of a triode Q2 in the push-pull device and grounded.
Furthermore, the signal compensation circuit comprises a calculator and a compensator, wherein the monitoring signal transmitted by the signal push-pull circuit is multiplied by the calculator, and the compensator transmits the monitoring signal to the monitoring center according to the frequency difference output by the calculator.
Furthermore, the calculator comprises a multiplier U2, a pin I0 of the multiplier U2 is connected with the other end of a capacitor C6 in the signal push-pull circuit, a pin I1 of the multiplier U2 is connected with one end of a resistor R12, the other end of the resistor R12 is connected with a standard signal, an output pin of the multiplier U2 is connected with one end of an inductor L1, the other end of the inductor L1 is respectively connected with one end of the capacitor C7 and one end of the resistor R14, the other end of the resistor R14 is connected with the non-inverting end of an operational amplifier U3B, the inverting end of the operational amplifier U3B is connected with the output end of the operational amplifier U3B, and the other end of the capacitor C7 is connected with ground.
Furthermore, the compensator comprises a capacitor C12, one end of the capacitor C12 is connected to one end of a resistor R15 and an output end of an operational amplifier U3B in the calculator, the other end of the resistor R15 is connected to a base of a transistor Q5, a collector of the transistor Q5 is connected to one end of a relay K1, the other end of the relay K1 is connected to one end of a resistor R2 in the signal push-pull circuit, the other end of the resistor R17 is connected to an I0 pin of a multiplier U4, an I1 pin of a multiplier U4 is connected to one end of a resistor R17, the other end of the resistor R17 is connected to one end of a switch S1, an I0 pin of a multiplier U2 in the calculator and the other end of a capacitor C6 in the signal push-pull circuit, an output end of a multiplier U4 is connected to one end of a capacitor C10, the other end of a capacitor C10 is connected to one end of a capacitor C11 and one end of an inductor L3, and the other end of a variable capacitor C11 is connected to one end of a variable capacitor C8 in the calculator, One end of an inductor L2, the other end of the inductor L2 are respectively connected with one end of a capacitor C9, a monitoring center and one end of a bipolar TVS diode D5, the other end of the bipolar TVS diode D5 is respectively connected with the other end of a capacitor C9, the other end of a variable capacitor C8, the other end of an inductor L4, the other end of the inductor L3, an emitter of a triode Q5 and the other end of a capacitor C7 in the calculator and is grounded, and the other end of a switch S1 is connected with the monitoring center.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages:
the peak superposed by commercial power is detected by arranging a voltage regulator tube D1, the peak superposed by the commercial power is led into a signal ground by utilizing a thyristor Q1, so that the amplitude of a monitoring signal is prevented from being influenced, the monitoring signal is subjected to frequency selection by utilizing a resistor R5, a capacitor C4, a resistor R6 and a capacitor C5, so that the electromagnetic environment in an elevator car body is prevented from being complicated, such as a signal sent by people wireless communication equipment existing in the elevator car and the influence of a signal sent by a wireless sensor in matched safety detection equipment set for the elevator, the monitoring signal is amplified by utilizing an operational amplifier U1B, the loss caused by the frequency selection of the monitoring signal by utilizing a resistor R5, a capacitor C4, a resistor R6 and a capacitor C5 is avoided, the monitoring signal is prevented from being detected and compensated by utilizing a multiplier U2, a multiplier U4, an inductor L1, a capacitor C7, a capacitor C10, an inductor L3, a capacitor C11 and an inductor L4, so that a cross channel for specially acquiring a monitoring video image of a camera head of the elevator car is also has a disordered channel "," ripple "or a matrix of disordered flying points, thorns and linear interferences, thereby influencing the watching of monitoring videos of the elevator car by workers.
Drawings
Fig. 1 is a schematic diagram of a monitored video image showing a cross-road.
Fig. 2 is a schematic circuit diagram of the present invention.
Detailed Description
The foregoing and other technical and functional aspects of the present invention will be apparent from the following detailed description of the embodiments, which proceeds with reference to the accompanying figures 1-2. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.
Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
A camera remote monitoring video transmission device is applied to a signal receiving end of a monitoring center and comprises a signal acquisition circuit, a signal transmission module and the monitoring center, wherein a signal push-pull circuit and a signal compensation circuit are arranged between the signal transmission module and the monitoring center, the signal push-pull circuit comprises a push-pull device and a frequency selector, a capacitor C1 is used for receiving a monitoring signal transmitted by the signal transmission module, a voltage regulator tube D1 is used for detecting peaks superposed by commercial power, when the voltage regulator tube D1 is conducted, a thyristor Q1 is conducted, the thyristor Q1 guides the peaks superposed by the commercial power into a signal ground, the monitoring signal is transmitted to a triode Q2 and a triode Q3 for push-pull, the monitoring signal is transmitted to the frequency selector, the frequency of the monitoring signal is selected by a resistor R5, the capacitor C4, a resistor R6 and the capacitor C5, and the monitoring signal is amplified by an operational amplifier U1B, the monitoring signal is followed by a field effect transistor Q4, the driving capability of the monitoring signal is improved, then the monitoring signal is transmitted to a signal compensation circuit, the signal compensation circuit comprises a calculator and a compensator, the calculator firstly receives the monitoring signal transmitted by a signal push-pull circuit by a multiplier U2, the multiplier U2 multiplies the monitoring signal by a standard signal to obtain the frequency difference and the frequency and two results of the monitoring signal and the standard signal, the result output by the multiplier U2 is passed through a low-pass filter consisting of an inductor L1 and a capacitor C7, so that the frequency difference between the monitoring signal and the standard signal is passed through, an operational amplifier U3B is used for following the frequency difference, the following signal is transmitted to the compensator, when the frequency difference between the monitoring signal and the standard signal is 0, the frequency difference conducts a triode Q5 through a resistor R15, and a relay K1 is powered on, when the switch S1 is closed, the monitoring signal is transmitted to the monitoring center through the closed switch S1, and when the frequency difference between the monitoring signal and the standard signal is not 0, the capacitor C12 couples the frequency difference to the multiplier U4, the multiplier U4 multiplies the frequency difference by the monitoring signal, and a high-pass filter composed of the capacitor C10, the inductor L3, the capacitor C11, and the inductor L4 is used to obtain the frequency sum of the frequency difference and the monitoring signal, that is, the frequency of the monitoring signal is compensated, the compensated signal is impedance-matched through the variable capacitor C8, the inductor L2, and the capacitor C9, and the bipolar TVS diode D5 is used to suppress the surge phenomenon, so as to protect the signal line of the monitoring center;
the signal push-pull circuit comprises a push-pull device and a frequency selector, wherein the push-pull device receives a monitoring signal transmitted by a signal transmission module by using a capacitor C1, a voltage regulator tube D1 is used for detecting a peak superposed by commercial power, when a voltage regulator tube D1 is conducted, a thyristor Q1 is conducted by using a resistor R1 and a capacitor C1, the thyristor Q1 guides the peak superposed by the commercial power into a signal ground to avoid influencing the amplitude of the monitoring signal, the monitoring signal is transmitted to a triode Q2 and a triode Q3 to carry out push-pull so as to realize the purposes of reducing the loss of the monitoring signal and improving the switching speed of the monitoring signal, meanwhile, a diode D2 and a diode D3 are used for avoiding the existence of cross distortion and avoiding the influence on the monitoring signal, the monitoring signal is transmitted to the frequency selector, and the monitoring signal is frequency-selected by using a resistor R5, a capacitor C4, a resistor R6 and a capacitor C5, so that the electromagnetic environment in an elevator car body is complicated like a signal transmitted by wireless communication device in the elevator car is avoided, Aiming at the influence of signals sent by a wireless sensor in matched safety detection equipment arranged in an elevator, the monitoring signals are amplified by using an operational amplifier U1B, the loss caused by frequency selection of the monitoring signals by using a resistor R5, a capacitor C4, a resistor R6 and a capacitor C5 is avoided, the monitoring signals are followed by using a field effect transistor Q4, the driving capability of the monitoring signals is improved, and then the monitoring signals are transmitted to a signal compensation circuit;
the push-pull device comprises a capacitor C1, one end of a capacitor C1 is connected with a signal transmission module, the other end of a capacitor C1 is respectively connected with the negative electrode of a voltage regulator tube D1, the anode of a thyristor Q1, the cathode of a diode D2 and the anode of a diode D3, the anode of a voltage regulator tube D1 is respectively connected with one end of the capacitor C2 and one end of a resistor R1, the control electrode of the thyristor Q1, the cathode of a thyristor Q1 is connected with a signal ground, the cathode of the diode D2 is respectively connected with one end of a resistor R3 and the base of a triode Q3, the collector of the triode Q3 is respectively connected with the other end of a resistor R3, one end of a capacitor C3 and one end of a resistor R2, the other end of a resistor R2 is connected with a positive power supply VCC, the emitter of a triode Q3 is connected with the emitter of a triode Q2, the base of a triode Q2 is respectively connected with one end of a resistor R4 and the cathode of a diode D3, and the collector of a triode Q2 is respectively connected with the other end of a resistor R4, The other end of the resistor R1, the other end of the capacitor C2 and the other end of the capacitor C3 are connected to the ground;
the frequency selector comprises a resistor R5, one end of a resistor R5 is respectively connected with an emitter of a triode Q3 and an emitter of a triode Q2 in the push-pull device, the other end of the resistor R5 is connected with one end of a capacitor C4, the other end of a capacitor C4 is respectively connected with a non-inverting end of an operational amplifier U1B, one end of a resistor R6 and one end of a capacitor C5, an inverting end of the operational amplifier U1B is respectively connected with one end of a resistor R8 and one end of a resistor R7, an output end of the operational amplifier U1B is respectively connected with one end of a resistor R9 and the other end of a resistor R8, the grid of a field effect transistor Q4, the drain of a field effect transistor Q4 is respectively connected with one end of a resistor R9 and one end of a resistor R2 in the push-pull device, the source of the field effect transistor Q4 is respectively connected with one end of a resistor R11 and one end of a capacitor C6, the other end of the resistor R11 is respectively connected with the other end of the resistor R7, the other end of the capacitor C5, the other end of the resistor R6 and the collector of a triode Q2 in the push-pull device and is grounded;
the signal compensation circuit comprises a calculator and a compensator, wherein the calculator receives a monitoring signal transmitted by a signal push-pull circuit by using a multiplier U2, the multiplier U2 multiplies the monitoring signal by a standard signal, wherein the standard signal refers to a signal which is transmitted by other cameras, such as a monitoring video image in an office hall, returns to be normal, and frequency difference, frequency and two results of the monitoring signal and the standard signal are obtained, the result output by the multiplier U2 passes through a low-pass filter consisting of an inductor L1 and a capacitor C7, so that the frequency difference between the monitoring signal and the standard signal is passed through, the frequency difference is followed by using an operational amplifier U3B, the following signal is transmitted to the compensator, and when the frequency difference between the monitoring signal and the standard signal is 0, the frequency difference shows that the frequency of the monitoring signal selected by using a resistor R5, the capacitor C4, a resistor R6 and a capacitor C5 is free of error, at this time, the frequency difference is conducted by a transistor Q5 through a resistor R15, at this time, a relay K1 is powered on, a switch S1 is closed, a monitoring signal is transmitted to the monitoring center through the closed switch S1, wherein the switch S1 is a pin switch of the relay K1, when the frequency difference between the monitoring signal and a standard signal is not 0, it indicates that there is an error in the frequency of the monitoring signal selected by the resistor R5, the capacitor C4, the resistor R6 and the capacitor C5, at this time, the capacitor C12 couples the frequency difference to a multiplier U4, the multiplier U4 multiplies the frequency difference by the monitoring signal, and the frequency difference and the frequency sum of the monitoring signal are obtained by a high-pass filter composed of the capacitor C10, the inductor L3, the capacitor C11 and the inductor L4, that the frequency of the monitoring signal is compensated, and the compensated signal is matched through a variable capacitor C8, an inductor L2 and a capacitor C9 to suppress interference in a signal line of the monitoring center caused by the compensated monitoring signal, the bipolar TVS diode D5 is used for inhibiting the surge phenomenon, and the signal line of the monitoring center is protected;
the calculator comprises a multiplier U2, wherein a pin I0 of the multiplier U2 is connected with the other end of a capacitor C6 in a signal push-pull circuit, a pin I1 of the multiplier U2 is connected with one end of a resistor R12, the other end of the resistor R12 is connected with a standard signal, an output pin of the multiplier U2 is connected with one end of an inductor L1, the other end of the inductor L1 is respectively connected with one end of the capacitor C7 and one end of the resistor R14, the other end of the resistor R14 is connected with the in-phase end of an operational amplifier U3B, the inverting end of the operational amplifier U3B is connected with the output end of the operational amplifier U3B, and the other end of the capacitor C7 is connected with the ground;
the compensator comprises a capacitor C12, one end of a capacitor C12 is respectively connected with one end of a resistor R15 and the output end of an operational amplifier U3B in the calculator, the other end of the resistor R15 is connected with the base electrode of a triode Q5, the collector electrode of a triode Q5 is connected with one end of a relay K1, the other end of a relay K1 is connected with one end of a resistor R2 in a signal push-pull circuit, the other end of the resistor R17 is connected with an I0 pin of a multiplier U4, an I1 pin of the multiplier U4 is connected with one end of a resistor R17, the other end of the resistor R17 is respectively connected with one end of a switch S1, an I0 pin of a multiplier U2 in the calculator and the other end of a capacitor C6 in the signal push-pull circuit, the output end of the multiplier U4 is connected with one end of a capacitor C10, the other end of a capacitor C10 is respectively connected with one end of a capacitor C11 and one end of an inductor L3, and the other end of a variable capacitor C11 is respectively connected with one end of a variable capacitor C8, One end of an inductor L2, the other end of the inductor L2 are respectively connected with one end of a capacitor C9, a monitoring center and one end of a bipolar TVS diode D5, the other end of the bipolar TVS diode D5 is respectively connected with the other end of a capacitor C9, the other end of a variable capacitor C8, the other end of an inductor L4, the other end of the inductor L3, an emitter of a triode Q5 and the other end of a capacitor C7 in the calculator and is grounded, and the other end of a switch S1 is connected with the monitoring center.
When the invention is used in concrete, the signal push-pull circuit comprises a push-pull device and a frequency selector, a capacitor C1 is used for receiving a monitoring signal transmitted by a signal transmission module, a voltage regulator tube D1 is used for detecting a peak superposed by commercial power, when a voltage regulator tube D1 is conducted, a thyristor Q1 is conducted, the thyristor Q1 guides the peak superposed by the commercial power into a signal ground, the monitoring signal is transmitted to a triode Q2 and a triode Q3 for push-pull, the monitoring signal is transmitted to the frequency selector, a resistor R5, a capacitor C4, a resistor R6 and a capacitor C5 are used for frequency selection of the monitoring signal, an operational amplifier U1B is used for amplifying the monitoring signal, a field effect tube Q4 is used for carrying out follow-up processing on the monitoring signal, the driving capability of the monitoring signal is improved, then the monitoring signal is transmitted to a signal compensation circuit, the signal compensation circuit comprises a calculator and a compensator, the calculator firstly uses a signal multiplier U2 for receiving the monitoring signal transmitted by the push-pull circuit, the multiplier U2 multiplies the monitoring signal by the standard signal to obtain the frequency difference and frequency sum of the monitoring signal and the standard signal, and the result output by the multiplier U2 is passed through a low pass filter composed of an inductor L1 and a capacitor C7 to pass the frequency difference between the monitoring signal and the standard signal, and an operational amplifier U3B is used to follow the frequency difference, and the following signal is transmitted to a compensator, when the frequency difference between the monitoring signal and the standard signal is 0, the frequency difference conducts a triode Q5 through a resistor R15, a relay K1 is powered on, the switch S1 is closed, the monitoring signal is transmitted to a monitoring center through a closed switch S1, and when the frequency difference between the monitoring signal and the standard signal is not 0, the capacitor C12 couples the frequency difference to the multiplier U4, the multiplier U4 multiplies the frequency difference by the monitoring signal, and the frequency difference is calculated by using capacitors C10, a frequency sum of the monitoring signal and the frequency sum of the monitoring signal, A high-pass filter composed of an inductor L3, a capacitor C11 and an inductor L4 obtains the frequency difference and the frequency sum of the monitoring signal, namely the frequency of the monitoring signal is compensated, the compensated signal is subjected to impedance matching through a variable capacitor C8, an inductor L2 and a capacitor C9, a bipolar TVS diode D5 is used for inhibiting the surge phenomenon, and the signal line of the monitoring center is protected;
the peak superposed by commercial power is detected by arranging a voltage regulator tube D1, the peak superposed by the commercial power is led into a signal ground by utilizing a thyristor Q1, so that the amplitude of a monitoring signal is prevented from being influenced, the monitoring signal is subjected to frequency selection by utilizing a resistor R5, a capacitor C4, a resistor R6 and a capacitor C5, so that the electromagnetic environment in an elevator car body is prevented from being complicated, such as a signal sent by people wireless communication equipment existing in the elevator car and the influence of a signal sent by a wireless sensor in matched safety detection equipment set for the elevator, the monitoring signal is amplified by utilizing an operational amplifier U1B, the loss caused by the frequency selection of the monitoring signal by utilizing a resistor R5, a capacitor C4, a resistor R6 and a capacitor C5 is avoided, the monitoring signal is prevented from being detected and compensated by utilizing a multiplier U2, a multiplier U4, an inductor L1, a capacitor C7, a capacitor C10, an inductor L3, a capacitor C11 and an inductor L4, so that a cross channel for specially acquiring a monitoring video image of a camera head of the elevator car is also has a disordered channel "," ripple "or a matrix of disordered flying points, thorns and linear interferences, thereby influencing the watching of monitoring videos of the elevator car by workers.
Claims (2)
1. A camera remote monitoring video transmission device comprises a signal acquisition module, a signal transmission module and a monitoring center, and is characterized in that a signal push-pull circuit and a signal compensation circuit are arranged between the signal transmission module and the monitoring center, the signal push-pull circuit receives a monitoring signal transmitted by the signal transmission module by using a push-pull device, transmits the monitoring signal to the signal compensation circuit after passing through a frequency selector, and the signal compensation circuit transmits the monitoring signal to a compensator by using a calculator and finally transmits the monitoring signal to the monitoring center;
the signal push-pull circuit comprises a push-pull device and a frequency selector, wherein the push-pull device receives a monitoring signal transmitted by the signal transmission module by using the push-pull device, selects the monitoring signal by using the frequency selector and transmits the selected monitoring signal to the signal compensation circuit;
the signal compensation circuit comprises a calculator and a compensator, wherein the monitoring signal transmitted by the signal push-pull circuit is multiplied by the calculator, and the compensator transmits the monitoring signal to the monitoring center according to the frequency difference output by the calculator;
the push-pull device comprises a capacitor C1, one end of a capacitor C1 is connected with a signal transmission module, the other end of a capacitor C1 is respectively connected with the negative electrode of a voltage regulator tube D1, the anode of a thyristor Q1, the cathode of a diode D2 and the anode of a diode D3, the anode of a voltage regulator tube D1 is respectively connected with one end of the capacitor C2 and one end of a resistor R1, the control electrode of the thyristor Q1, the cathode of a thyristor Q1 is connected with a signal ground, the cathode of the diode D2 is respectively connected with one end of a resistor R3 and the base of a triode Q3, the collector of the triode Q3 is respectively connected with the other end of a resistor R3, one end of a capacitor C3 and one end of a resistor R2, the other end of a resistor R2 is connected with a positive power supply VCC, the emitter of a triode Q3 is connected with the emitter of a triode Q2, the base of a triode Q2 is respectively connected with one end of a resistor R4 and the cathode of a diode D3, and the collector of a triode Q2 is respectively connected with the other end of a resistor R4, The other end of the resistor R1, the other end of the capacitor C2 and the other end of the capacitor C3 are connected to the ground;
the frequency selector comprises a resistor R5, one end of a resistor R5 is respectively connected with an emitter of a triode Q3 and an emitter of a triode Q2 in the push-pull device, the other end of the resistor R5 is connected with one end of a capacitor C4, the other end of a capacitor C4 is respectively connected with a non-inverting end of an operational amplifier U1B, one end of a resistor R6 and one end of a capacitor C5, an inverting end of the operational amplifier U1B is respectively connected with one end of a resistor R8 and one end of a resistor R7, an output end of the operational amplifier U1B is respectively connected with one end of a resistor R9 and the other end of a resistor R8, the grid of a field effect transistor Q4, the drain of a field effect transistor Q4 is respectively connected with one end of a resistor R9 and one end of a resistor R2 in the push-pull device, the source of the field effect transistor Q4 is respectively connected with one end of a resistor R11 and one end of a capacitor C6, the other end of the resistor R11 is respectively connected with the other end of the resistor R7, the other end of the capacitor C5, the other end of the resistor R6 and the collector of a triode Q2 in the push-pull device and is grounded;
the compensator comprises a capacitor C12, one end of a capacitor C12 is respectively connected with one end of a resistor R15 and the output end of an operational amplifier U3B in the calculator, the other end of the resistor R15 is connected with the base electrode of a triode Q5, the collector electrode of a triode Q5 is connected with one end of a relay K1, the other end of a relay K1 is connected with one end of a resistor R2 in a signal push-pull circuit, the other end of the resistor R17 is connected with an I0 pin of a multiplier U4, an I1 pin of the multiplier U4 is connected with one end of a resistor R17, the other end of the resistor R17 is respectively connected with one end of a switch S1, an I0 pin of a multiplier U2 in the calculator and the other end of a capacitor C6 in the signal push-pull circuit, the output end of the multiplier U4 is connected with one end of a capacitor C10, the other end of a capacitor C10 is respectively connected with one end of a capacitor C11 and one end of an inductor L3, and the other end of a variable capacitor C11 is respectively connected with one end of a variable capacitor C8, One end of an inductor L2, the other end of the inductor L2 are respectively connected with one end of a capacitor C9, a monitoring center and one end of a bipolar TVS diode D5, the other end of the bipolar TVS diode D5 is respectively connected with the other end of a capacitor C9, the other end of a variable capacitor C8, the other end of an inductor L4, the other end of the inductor L3, an emitter of a triode Q5 and the other end of a capacitor C7 in the calculator and is grounded, and the other end of a switch S1 is connected with the monitoring center.
2. The camera remote monitoring video transmission device according to claim 1, wherein the calculator comprises a multiplier U2, a pin I0 of the multiplier U2 is connected to the other end of a capacitor C6 in the signal push-pull circuit, a pin I1 of the multiplier U2 is connected to one end of a resistor R12, the other end of the resistor R12 is connected to the standard signal, an output pin of the multiplier U2 is connected to one end of an inductor L1, the other end of the inductor L1 is connected to one end of a capacitor C7 and one end of a resistor R14, the other end of the resistor R14 is connected to a non-inverting terminal of an operational amplifier U3B, an inverting terminal of the operational amplifier U3B is connected to an output terminal of the operational amplifier U3B, and the other end of the capacitor C7 is connected to ground.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110479632.0A CN113179395B (en) | 2021-04-30 | 2021-04-30 | Camera remote monitoring video transmission device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110479632.0A CN113179395B (en) | 2021-04-30 | 2021-04-30 | Camera remote monitoring video transmission device |
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| CN113179395A CN113179395A (en) | 2021-07-27 |
| CN113179395B true CN113179395B (en) | 2021-10-15 |
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| JPS5999891A (en) * | 1982-11-29 | 1984-06-08 | Sanyo Electric Co Ltd | Tracking error detecting circuit |
| US7940129B1 (en) * | 2008-05-21 | 2011-05-10 | Marvell International Ltd. | Low KVCO phase-locked loop with large frequency drift handling capability |
| CN103199914A (en) * | 2012-07-02 | 2013-07-10 | 深圳格兰泰克科技有限公司 | Frequency shift repeater based on frequency difference digital compensation and frequency difference digital compensation method |
| CN107888530B (en) * | 2016-09-30 | 2021-01-22 | 电信科学技术研究院 | Transmission method, transmitting device and receiving device of phase noise compensation reference signal |
| FI129033B (en) * | 2017-09-21 | 2021-05-31 | Teknologian Tutkimuskeskus Vtt Oy | Long-distance rf frequency and time transfer |
| CN109379312A (en) * | 2018-11-02 | 2019-02-22 | 钟祥博谦信息科技有限公司 | A kind of Phase Compensation System and method for frequency signal |
| CN109889795B (en) * | 2019-04-17 | 2020-09-18 | 冯芊雅 | Household video monitoring system |
| CN110085019B (en) * | 2019-05-29 | 2019-12-24 | 金居建设发展股份有限公司 | Wisdom chemical industry ground construction environment signal acquisition emitter |
| CN110324431B (en) * | 2019-07-17 | 2020-07-07 | 郑州工程技术学院 | User data management system based on cloud computing |
| CN110290359B (en) * | 2019-07-31 | 2020-04-17 | 深圳市众安威视技术有限公司 | Camera signal transmission system |
| CN110418063B (en) * | 2019-08-30 | 2020-04-17 | 深圳市众安威视技术有限公司 | Camera signal calibration system |
| CN110460796B (en) * | 2019-08-30 | 2021-04-27 | 中瑞恒（北京）科技有限公司 | Industrial equipment operation monitoring signal regulating circuit |
| CN211457263U (en) * | 2020-04-28 | 2020-09-08 | 国网河南省电力公司信息通信公司 | Video network signal regulating circuit |
| CN111865299A (en) * | 2020-08-06 | 2020-10-30 | 电子科技大学 | Wide-band application self-adaptive timing circuit based on phase-locked loop modulation |
| CN112713868B (en) * | 2021-01-07 | 2023-09-22 | 湖北华中电力科技开发有限责任公司 | Network supervision system |
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