CN211457263U - Video network signal regulating circuit - Google Patents
Video network signal regulating circuit Download PDFInfo
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- CN211457263U CN211457263U CN202020678280.2U CN202020678280U CN211457263U CN 211457263 U CN211457263 U CN 211457263U CN 202020678280 U CN202020678280 U CN 202020678280U CN 211457263 U CN211457263 U CN 211457263U
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Abstract
The utility model discloses a video network signal regulating circuit, including surveillance camera head and network video server, the video signal that the surveillance camera head was gathered still reachs network video server behind two-stage amplifier circuit, harmonious follower circuit in proper order. The problem that the precision of the video signal is reduced due to the fact that the video signal collected by the monitoring camera is affected by attenuation and noise in the transmission process is effectively solved. The utility model discloses a weak signal that surveillance camera head gathered is enlargied the back through two-stage amplifier circuit and is transmitted to harmonious following circuit, harmonious following circuit transmits video signal to network video server, the signal that will be gathered surveillance camera head carries out the two-stage and enlargies, the influence of the decay that the reduction signal received when transmitting, the video signal is selected to the resonant tank among the harmonious following circuit, avoid the influence that high frequency interference produced video signal, reflection interference has been suppressed to the emitter follower among the harmonious following circuit, the precision of video signal has been improved.
Description
Technical Field
The utility model relates to a signal conditioning field, especially a video network signal conditioning circuit.
Background
Since the advent of the monitoring camera, the monitoring camera is gradually popular with people due to the continuous improvement of functions, and plays an important role in daily work and life of people. The existing monitoring camera has multiple working modes, one of the working modes is that a video signal acquired by the monitoring camera is transmitted to a network video server, and the network video server transmits the video signal to a computer network through the network, wherein the network video server is responsible for converting the video signal from an analog signal into a digital signal, compressing the digital signal by a high-efficiency compression chip, encoding the digital signal and outputting the digital signal which can be transmitted in the computer network, but the video signal is inevitably affected by attenuation and noise in the transmission process, so that the precision of the video signal is reduced when the network video server processes the video signal.
Therefore, the utility model provides a new scheme to solve the problem.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a video network signal regulating circuit, the effectual video signal who has solved surveillance camera head and has gathered because of receiving the influence of decay and noise in transmission process to the problem of precision decline when making network video server handle video signal.
The technical scheme includes that the system comprises a monitoring camera and a network video server, video signals collected by the monitoring camera sequentially pass through a two-stage amplifying circuit and a tuning following circuit and then reach the network video server, weak signals collected by the monitoring camera are amplified by the two-stage amplifying circuit and then are transmitted to the tuning following circuit, and the tuning following circuit selects video signals from the received signals and transmits the video signals to the network video server.
The utility model discloses a following beneficial effect:
(1) the weak signals collected by the monitoring camera U1 are amplified under the action of the operational amplifier U2B and the operational amplifier U3B in the two-stage amplifying circuit, so that the attenuation of the signals during transmission is reduced, and the processing of the network video server on the video signals is influenced;
(2) a video signal with the frequency of 12MHz is selected through a resonant circuit of a resistor R10, a capacitor C2 and an inductor L1 in the tuning follower circuit, signals with other frequencies are filtered, the influence of high-frequency interference on the video signal is avoided, an emitter follower consisting of a triode Q2, a resistor R14 and a resistor R15 is adopted to realize impedance matching, the influence of reflection interference on the video signal is avoided, and the precision of the video signal is improved.
Drawings
Fig. 1 is a schematic diagram of a two-stage amplification circuit in the circuit of the present invention.
Fig. 2 is a schematic diagram of a tuning follower circuit in the circuit of the present invention.
Detailed Description
The foregoing and other technical and scientific aspects, features and advantages of the present invention will be apparent from the following detailed description of the embodiments, which is to be read in connection with the accompanying drawings of fig. 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 video network signal adjusting circuit is applied between a monitoring camera and a network video server, the monitoring camera with the model number of SONY 4140+673 is adopted, a two-stage amplifying circuit amplifies a signal collected by a monitoring camera U1, an operational amplifier U2B amplifies the signal in one stage, an operational amplifier U2B amplifies the signal in two stages, an amplitude limiting link consisting of a diode D1 and a diode D2 is used for protecting an operational amplifier U3B, the video signal amplified by the two-stage amplifying circuit is transmitted to a tuning follower circuit, a video signal with the frequency of 12MHz is selected through the resonance effect of a resistor R10, a capacitor C2 and an inductor L1 in the tuning follower circuit, signals with other frequencies are filtered, the influence of high-frequency noise on the video signal is avoided, the video signal is amplified by the operational amplifier U4B, an emitter follower consisting of a triode Q2, a resistor R14 and a resistor R15 is used for improving the capability of the operational amplifier U4B for driving the network video server, the received weak signals are amplified through an operational amplifier U2B, a resistor R2, an operational amplifier U3B and a resistor R6 in a two-stage amplifying circuit, the attenuation of the signals collected by a monitoring camera U1 during transmission is reduced, the video signals with the frequency of 12MHz are selected through the resonance effect of the resistor R10, the capacitor C2 and the inductor L1 in a tuning following circuit, signals with other frequencies are filtered, the influence of high-frequency interference on the video signals is avoided, impedance matching is achieved through an emitter follower consisting of a triode Q2, a resistor R14 and a resistor R15, and the influence of reflection interference on the video signals is avoided.
The two-stage amplifying circuit amplifies a signal acquired by a monitoring camera U1 twice and then transmits the signal to a tuning follower circuit, an operational amplifier U2B in the two-stage amplifying circuit amplifies a video signal once, a resistor R2 is used as a feedback resistor of an operational amplifier U2B to control an output signal of the operational amplifier U2B in a stable range, a diode D1 and a diode D2 are reversely connected in parallel and then connected in series between the operational amplifier U2B and the operational amplifier U3B, the operational amplifier U3B is protected by a resistor R4, the operational amplifier U3B amplifies the video signal for the second time, a resistor R6 is used as a feedback resistor of an operational amplifier U3B to control an output signal of the operational amplifier U2B in a stable range, so that the signal output to the tuning follower circuit is stable in a certain range, the resistor R1 and the resistor R3 are used as a protection resistor of the operational amplifier U2B, the operational amplifier U2 forms a protection amplifier U4642, and the resistor R5 is a protection resistor B of the operational amplifier U3, the protective operational amplifier U3B is damaged due to overlarge output signals, the combined action of the operational amplifier U2B and the operational amplifier U3B enables signals collected by the monitoring camera U1 not to influence subsequent processing due to attenuation, the protective operational amplifier comprises a resistor R1, one end of the resistor R1 is connected with an OUT pin of the monitoring camera U1, a VCC pin of the monitoring camera U1 is connected with a positive power VCC, a GND pin of the monitoring camera U1 is respectively connected with one end of a resistor R3 and one end of a resistor R5 and is connected with the ground, the other end of the resistor R1 is connected with a non-inverting input end of the operational amplifier U2B, an inverting input end of the operational amplifier U2B is respectively connected with one end of the resistor R2 and the other end of the resistor R3, an output end of the operational amplifier U2 is respectively connected with the other end of a resistor R2, an anode of a diode D1 and a cathode of a diode D2, a cathode of a diode D1 is respectively connected with one end of the resistor R4, an anode 6867 of the operational amplifier U B and an non-inverting input end of the operational amplifier U4, the reverse input end of the operational amplifier U3B is respectively connected with the other end of the resistor R5 and one end of the resistor R6, and the output end of the operational amplifier U3B is connected with the other end of the resistor R6;
the tuning following circuit transmits a signal transmitted by a capacitor C1 receiving a two-stage amplifying circuit to a base of a triode Q1, a 12MHz video signal is selected from a resonant circuit consisting of an inductor L1, a resistor R10 and a capacitor C2, signals with other frequencies are filtered, influence on the video signal due to high-frequency interference of the 12MHz video signal is avoided, the high-frequency interference can enable the video signal to be converted into an image on a computer, a snowflake point or a highlight point appears, the triode Q1 is responsible for continuously supplementing electric energy to the resonant circuit consisting of the inductor L1, the resistor R10 and the capacitor C2 so as to counteract loss generated by the resonant circuit during oscillation, the reaction speed of the triode Q1 is improved by using a Schottky diode D3 so as to avoid influence of too slow reaction speed of the triode Q1 on the resonant circuit consisting of the inductor L1, the resistor R10 and the capacitor C2 to select the video signal, and the resistor R7 provides proper base voltage for the triode Q1, a resistor R8, a resistor R9 and a capacitor C3 are used for keeping the triode Q1 in an operating state, a resonant circuit consisting of an inductor L1, a resistor R10 and a capacitor C2 outputs a video signal to an operational amplifier U4B through an inductor L1 and an operational amplifier U4 11, the operational amplifier U4B is used for amplifying the video signal again, a resistor R13 is a protective resistor of the operational amplifier U4B, a resistor R12 is a feedback resistor of the operational amplifier U4B, the amplification factor of the operational amplifier U4B on the video signal is controlled for a network video server to process the video signal, an emitter follower is formed by the triode Q2, a resistor R14 and a resistor R15 to realize impedance matching, the video signal is transmitted to the network video server through an emitter of the triode Q2, reflection interference caused by impedance mismatch between a tuning follower circuit and the network video server is avoided, and the phenomenon that the video signal is converted into an image on a computer due to generate a ghost image due to the reflection interference, the capacity of the operational amplifier U4B for driving the network video server is also improved, the resistor R14 is a collector resistor of the triode Q2, the resistor R15 is an emitter resistor of the triode Q2, and comprises a capacitor C1, one end of the capacitor C1 is respectively connected with the output end of the operational amplifier U3B of the two-stage amplifying circuit and the other end of the resistor R6, the other end of the capacitor C1 is respectively connected with one end of a resistor R7, one end of a resistor R8, the anode of a Schottky diode D3 and the base of a triode Q1, the collector of the triode Q1 is respectively connected with the cathode of a Schottky diode D3, one end of a resistor R10, one end of a capacitor C2 and one end of an inductor L1, the other end of the resistor R1 is respectively connected with the other end of a resistor R1, the other end of the inductor L1 and one end of the resistor R1 are respectively connected with a positive power supply VCC, the emitter of the triode Q1 is respectively connected with one end of the, The other end of the resistor R8 is connected with the other end of the resistor R9, the other end of the capacitor C3 and the other end of the resistor R13 in parallel and is grounded, one end of the resistor R11 is connected with the middle position of the inductor L1, the other end of the resistor R11 is connected with the non-inverting input end of the operational amplifier U4B, the inverting input end of the operational amplifier U4B is connected with one end of the resistor R12, the other end of the resistor R13 and one end of the resistor R15, the output end of the operational amplifier U4B is connected with the other end of the resistor R12 and the base of the triode Q2, the collector of the triode Q2 is connected with the other end of the resistor R14, and the emitter of the triode Q2 is connected with the other.
When the utility model is used, firstly, the weak signal collected by the monitoring camera U1 is amplified twice by using the two-stage amplifying circuit, the weak signal is amplified for one time by using the operational amplifier U2B and the resistor R2, the weak signal collected by the monitoring camera U1 is amplified for the second time by using the operational amplifier U3B and the resistor R6, the operational amplifier U3B is protected by using the diode D1, the diode D2, the resistor R4 and the resistor R5, the damage to the operational amplifier U3B caused by the overlarge signal amplified by the operational amplifier U2B is avoided, the resistor R1 and the resistor R3 form the protection to the operational amplifier U2B, the signal collected by the monitoring camera U1 is received by the capacitor C1 in the tuning following circuit by using the output end of the operational amplifier U3B, the MHz video signal which is selected by the resonance circuit consisting of the resistor R10, the capacitor C2 and the inductor 1 in the following circuit, signals of other frequencies are filtered, the influence of high-frequency interference of video signals with frequency higher than that of 12MHz video signals on the video signals is avoided, a triode Q1 is responsible for continuously supplementing electric energy to a resonant loop formed by an inductor L1, a resistor R10 and a capacitor C2 so as to counteract loss generated when the resonant loop oscillates, the selected video signals are output to a resistor R11 through the inductor L1 and then output to an operational amplifier U4B, the operational amplifier U4B amplifies the video signals so as to be processed by a network video server, an emitter follower is formed by the triode Q2, the resistor R14 and the resistor R15 so as to improve the capability of the operational amplifier U4B for driving the network video server, reflection interference caused by impedance mismatching between a tuning following circuit and the network video server is avoided, and the received weak signals are amplified by the operational amplifier U2B, the resistor R2, the operational amplifier U3B and the resistor R6 in a two-stage amplifying circuit, the attenuation of signals collected by a monitoring camera U1 during transmission is reduced, the video signals with the frequency of 12MHz are selected through the resonance effect of a resistor R10, a capacitor C2 and an inductor L1 in a tuning follower circuit, signals with other frequencies are filtered, the influence of high-frequency interference on the video signals is also avoided, the impedance matching is realized by adopting an emitter follower consisting of a triode Q2, a resistor R14 and a resistor R15, and the influence of reflection interference on the video signals is avoided.
Claims (3)
1. A video network signal adjusting circuit comprises a monitoring camera and a network video server, wherein a video signal collected by the monitoring camera is transmitted to the network video server for processing, and the video signal adjusting circuit is characterized in that the video signal collected by the monitoring camera sequentially passes through a two-stage amplifying circuit and a tuning following circuit and then reaches the network video server, a weak video signal collected by the monitoring camera is amplified by the two-stage amplifying circuit and then is transmitted to the tuning following circuit, and the tuning following circuit selects a video signal from the received signal and transmits the video signal to the network video server.
2. The video network signal conditioning circuit according to claim 1, wherein the two-stage amplifying circuit comprises a resistor R1, one end of the resistor R1 is connected to an OUT pin of the monitoring camera U1, a VCC pin of the monitoring camera U1 is connected to a positive power source VCC, a GND pin of the monitoring camera U1 is connected to one end of a resistor R3 and one end of a resistor R5 respectively and is connected to ground, the other end of the resistor R1 is connected to a non-inverting input terminal of the operational amplifier U2B, an inverting input terminal of the operational amplifier U2B is connected to one end of the resistor R2 and the other end of the resistor R3 respectively, an output terminal of the operational amplifier U2B is connected to the other end of the resistor R2, an anode of the diode D1 and a cathode of the diode D2 respectively, a cathode of the diode D1 is connected to one end of the resistor R4, an anode of the diode D2 and the other end of the resistor R B respectively and a non-inverting input terminal of the operational amplifier U3 5, One end of the resistor R6 and the output end of the operational amplifier U3B are connected with the other end of the resistor R6.
3. The video network signal conditioning circuit of claim 1, wherein the tuning follower circuit comprises a capacitor C1, one end of the capacitor C1 is connected to the output terminal of the operational amplifier U3B of the two-stage amplifier circuit and the other end of the resistor R6, the other end of the capacitor C1 is connected to one end of the resistor R7, one end of the resistor R8, the anode of the schottky diode D3 and the base of the transistor Q1, the collector of the transistor Q1 is connected to the cathode of the schottky diode D3, one end of the resistor R10, one end of the capacitor C2 and one end of the inductor L1, the other end of the resistor R7 is connected to the other end of the resistor R10, the other end of the capacitor C2, the other end of the inductor L1 and one end of the resistor R14 are connected to the positive power source VCC, the emitter of the transistor Q9 is connected to one end of the resistor R9, one end of the capacitor C3 and the other end of the resistor R8 are connected to the other end of, The other end of the capacitor C3 and the other end of the resistor R13 are connected in parallel and grounded, one end of the resistor R11 is connected with the middle position of the inductor L1, the other end of the resistor R11 is connected with the non-inverting input end of the operational amplifier U4B, the inverting input end of the operational amplifier U4B is connected with one end of the resistor R12, the other end of the resistor R13 and one end of the resistor R15 respectively, the output end of the operational amplifier U4B is connected with the other end of the resistor R12 and the base of the triode Q2 respectively, the collector of the triode Q2 is connected with the other end of the resistor R14, and the emitter of the triode Q2 is connected with the other end of the resistor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020678280.2U CN211457263U (en) | 2020-04-28 | 2020-04-28 | Video network signal regulating circuit |
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| CN202020678280.2U CN211457263U (en) | 2020-04-28 | 2020-04-28 | Video network signal regulating circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113179395A (en) * | 2021-04-30 | 2021-07-27 | 深圳市金乾象科技有限公司 | Camera remote monitoring video transmission device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113179395A (en) * | 2021-04-30 | 2021-07-27 | 深圳市金乾象科技有限公司 | Camera remote monitoring video transmission device |
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