CN109889795A - A kind of domestic video monitoring system - Google Patents
A kind of domestic video monitoring system Download PDFInfo
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- CN109889795A CN109889795A CN201910306587.1A CN201910306587A CN109889795A CN 109889795 A CN109889795 A CN 109889795A CN 201910306587 A CN201910306587 A CN 201910306587A CN 109889795 A CN109889795 A CN 109889795A
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Abstract
The invention discloses a kind of domestic video monitoring systems, including frequency collection circuit 1, frequency collection circuit 2, rectification calibration circuit and filtering output circuit, the frequency collection circuit 1, frequency collection circuit 2 acquires the analog signal of signal transmission passage input terminal and output end both ends in domestic video monitoring system controlling terminal respectively, the rectification calibration circuit uses variable resistance RW1 and capacitor C4, capacitor C3 forms rectification circuit to signal rectification, and with diode D6- diode D9 and transport and placing device AR1 composition compound circuit to signal limiter-amplification-amplitude limiting processing, the frequency collection circuit 2 is with transport and placing device AR2- transport and placing device AR4 and capacitor C14 composition loss compensation circuit to rectification calibration circuit output signal compensation, the last filtering output circuit uses inductance L2 and capacitor It is exported after C10, capacitor C11 composition π type filter circuit filtering, signal frequency can be converted to the thermal compensation signal of signal transmission passage output end signal in domestic video monitoring system controlling terminal.
Description
Technical field
The present invention relates to field of circuit technology, more particularly to a kind of domestic video monitoring system.
Background technique
Network video monitor and control system is all round computer IP video technique, video and Audio data compression and decompression
The system that technology, Internet application technology combine, long-distance video control system can release monitoring information monitoring center,
It can be reached on the computer of desktop by computer network, to melt with information management system and the office automation system
It is combined, is preferably management service, raise the management level and efficiency, domestic video monitoring system are as technological core
Design improves the management level and efficiency of home environment monitoring, however domestic video monitoring system itself sometimes can also go out
The problem of existing failure, especially signal disorder, domestic video monitoring system data is caused error occur, needs to supervise home videos
The signal real-time detection of signal transmission passage in control system controlling terminal.
Summary of the invention
For above situation, for the defect for overcoming the prior art, purpose of the present invention is to provide a kind of home videos prisons
Control system, can in real-time detection domestic video monitoring system controlling terminal signal transmission passage signal(l)ing condition, while will letter
Number frequency conversion is the thermal compensation signal of signal transmission passage output end signal in domestic video monitoring system controlling terminal.
Its technical solution solved is: a kind of domestic video monitoring system, including frequency collection circuit 1, frequency collection electricity
Road 2, rectification calibration circuit and filtering output circuit, the frequency collection circuit 1, frequency collection circuit 2 acquire family's view respectively
The analog signal of signal transmission passage input terminal and output end both ends, the signal transmission passage are in frequency monitoring system controlling terminal
Controlling terminal receives the channel of analog signal in domestic video monitoring system, and the rectification calibration circuit uses variable resistance RW1
With capacitor C4, capacitor C3 composition rectification circuit to signal rectification, while with triode Q1, triode Q2 composition push-pull circuit drop
The conduction loss of low signal, and with diode D6- diode D9 and transport and placing device AR1 composition compound circuit to signal limiter-
Amplification-amplitude limiting processing most filters out single-frequency through capacitor C7- capacitor C9 and resistance R8- resistance R10 composition frequency selection circuit afterwards
After signal in input filter output circuit, wherein voltage-stabiliser tube D5 and silicon-controlled VTL1 forms feed circuit feedback regulation compound circuit
Output amplitude, the frequency collection circuit 2 is with transport and placing device AR2- transport and placing device AR4 and capacitor C14 composition drop out compensation electricity
Road uses inductance L2 and capacitor C10, capacitor C11 to rectification calibration circuit output signal compensation, the last filtering output circuit
It is exported after composition π type filter circuit filtering, that is to say and exported for signal transmission passage in domestic video monitoring system controlling terminal
The thermal compensation signal of end signal；
Rectification calibration circuit includes variable resistance RW1, the contact 2 of variable resistance RW1 connect diode D4 cathode and
One end of capacitor C3, capacitor C5, resistance R2, the contact 1 of variable resistance RW1 connect anode and one end of capacitor C4 of diode D3,
The anode of diode D4 connects the cathode of diode D3 and the other end of capacitor C4, capacitor C3, and the contact 3 of variable resistance RW1 connects three
The base stage of pole pipe Q1, triode Q2, the collector of triode Q1 meet power supply+5V, and the emitter of triode Q1 connects triode Q2's
The anode of the cathode of emitter and diode D7, diode D6, the collector of triode Q2 connect one end of variable resistance R3, can be changed
The other end of resistance R3 is grounded, the cathode of one end of the positive connecting resistance R4 of diode D7 and diode D6, transport and placing device AR1 it is same
Phase input terminal, one end of the anti-phase input terminating resistor R5 of transport and placing device AR1, the other end ground connection of resistance R5, transport and placing device AR1's is defeated
The anode of the cathode of the other end of terminating resistor R4 and diode D9, diode D8, the anode of diode D9 meet diode D8 out
Cathode, the cathode of voltage-stabiliser tube D5 and the anode of resistance R8, one end of capacitor C7 and silicon-controlled VTL1, silicon-controlled VTL1's is negative
One end of pole connecting resistance R7, the control electrode of silicon-controlled VTL1 connect the anode of voltage-stabiliser tube D5 and one end of resistance R6, capacitor C6, resistance
The other end ground connection of R6, capacitor C6, the other end of another termination capacitor C5 of resistance R7, another termination capacitor C8 of capacitor C7,
One end of resistance R9, one end of another termination capacitor C9 of resistance R8, resistance R10, the other end ground connection of resistance R9, capacitor C9,
The other end of another terminating resistor R10 of capacitor C8 and the output end of transport and placing device AR4.
By above technical scheme, the invention has the benefit that
1. calibrating circuit output to rectification with transport and placing device AR2- transport and placing device AR4 and capacitor C14 composition loss compensation circuit
Signal compensation is further ensured that the consistency of signal, prevents thermal compensation signal and source signal current potential inconsistent, and that improves this circuit can
By property；
2. signal noise is eliminated to signal rectification with variable resistance RW1 and capacitor C4, capacitor C3 composition rectification circuit,
The conduction loss for reducing signal with triode Q1, triode Q2 composition push-pull circuit simultaneously, improves the switching speed of signal, and
And signal is made to signal limiter-amplification-amplitude limiting processing with diode D6- diode D9 and transport and placing device AR1 composition compound circuit
There are enough clipping depth (40~50dB), using clipping and amplifies alternately, and diode D6, diode D7 composition
Amplitude limiter circuit and the amplitude limiter circuit of diode D8, diode D9 composition are symmetrical limiting, it is ensured that signal has enough passbands
Band；
3. in error range in order to further ensure signal potential, with voltage-stabiliser tube D5 and silicon-controlled VTL1 composition feedback
Circuit detects abnormal signal, and abnormal signal, feedback abnormal signal to rectified current are detected using the conducting voltage of silicon-controlled VTL1
In road, abnormal signal is eliminated using bleeder circuit R2, stabilization signal amplitude forms π with inductance L2 and capacitor C10, capacitor C11
It is exported after the filtering of type filter circuit, filters out signal noise, that is to say and transmitted for signal in domestic video monitoring system controlling terminal
The thermal compensation signal of channel output end signal reduces signal errors, anti-stop signal disorder in the way of thermal compensation signal.
Detailed description of the invention
Fig. 1 is system module figure of the invention.
Fig. 2 is circuit diagram of the invention.
Specific embodiment
For the present invention aforementioned and other technology contents, feature and effect, in following cooperation with reference to figures 1 through attached drawing 2
To in the detailed description of embodiment, can clearly present.The structure content being previously mentioned in following embodiment is with specification
Attached drawing is reference.
Each exemplary embodiment of the invention is described below with reference to accompanying drawings.
Embodiment one, a kind of domestic video monitoring system, including frequency collection circuit 1, frequency collection circuit 2, rectification school
Quasi- circuit and filtering output circuit, the frequency collection circuit 1, frequency collection circuit 2 acquire domestic video monitoring system respectively
The analog signal of signal transmission passage input terminal and output end both ends in controlling terminal, the signal transmission passage are home videos prisons
Controlling terminal receives the channel of analog signal in control system, and the rectification calibration circuit uses variable resistance RW1 and capacitor C4, electricity
Hold C3 composition rectification circuit to signal rectification, while reducing leading for signal with triode Q1, triode Q2 composition push-pull circuit
Logical loss, and with diode D6- diode D9 and transport and placing device AR1 composition compound circuit to signal limiter-amplification-clipping at
Reason most inputs after capacitor C7- capacitor C9 and resistance R8- resistance R10 composition frequency selection circuit filters out the signal of single-frequency afterwards
It filters in output circuit, wherein the vibration of voltage-stabiliser tube D5 and silicon-controlled VTL1 composition feed circuit feedback regulation compound circuit output signal
Width, the frequency collection circuit 2 is with transport and placing device AR2- transport and placing device AR4 and capacitor C14 composition loss compensation circuit to rectification school
Quasi- circuit output signal compensation, the last filtering output circuit is with inductance L2 and capacitor C10, capacitor C11 composition π type filtering
It exports, is that is to say as the compensation of signal transmission passage output end signal in domestic video monitoring system controlling terminal after circuit filtering
Signal；
Rectification calibration circuit with variable resistance RW1 and capacitor C4, capacitor C3 composition rectification circuit to signal rectification,
Signal noise is eliminated, while reducing the conduction loss of signal with triode Q1, triode Q2 composition push-pull circuit, improves signal
Switching speed, and with diode D6- diode D9 and transport and placing device AR1 composition compound circuit to signal limiter-amplification-limit
Width processing, makes signal have enough clipping depth (40~50dB), using clipping and amplifies alternately, and diode D6,
The amplitude limiter circuit of diode D7 composition and the amplitude limiter circuit of diode D8, diode D9 composition are symmetrical limiting, it is ensured that letter
Number there are enough passbands, most filters out single frequency through capacitor C7- capacitor C9 and resistance R8- resistance R10 composition frequency selection circuit afterwards
After the signal of rate in input filter output circuit, guarantee the stabilization of signal frequency, in order to further ensure signal potential is in error
In range, abnormal signal is detected with voltage-stabiliser tube D5 and silicon-controlled VTL1 composition feed circuit, utilizes the conducting of silicon-controlled VTL1
Voltage detects abnormal signal, feeds back in abnormal signal to rectification circuit, bleeder circuit R2 is utilized to eliminate abnormal signal, stablize letter
Number amplitude；The contact 2 of variable resistance RW1 connects the cathode of diode D4 and one end of capacitor C3, capacitor C5, resistance R2, can power transformation
The contact 1 of resistance RW1 connects the anode of diode D3 and one end of capacitor C4, the anode of diode D4 connect the cathode and electricity of diode D3
Hold the other end of C4, capacitor C3, the contact 3 of variable resistance RW1 connects the base stage of triode Q1, triode Q2, the collection of triode Q1
Electrode meets power supply+5V, and the emitter of triode Q1 is connecing the emitter of triode Q2 and the cathode of diode D7, diode D6 just
Pole, the collector of triode Q2 connect one end of variable resistance R3, the other end ground connection of variable resistance R3, and the anode of diode D7 connects
The anti-phase input of the non-inverting input terminal of the cathode of one end of resistance R4 and diode D6, transport and placing device AR1, transport and placing device AR1 terminates electricity
Hinder one end of R5, the other end ground connection of resistance R5, the other end of output terminating resistor R4 of transport and placing device AR1 and bearing for diode D9
Pole, diode D8 anode, the anode of diode D9 meets the cathode of diode D8, the cathode of voltage-stabiliser tube D5 and resistance R8, capacitor
The anode of one end of C7 and silicon-controlled VTL1, one end of the cathode connecting resistance R7 of silicon-controlled VTL1, the control of silicon-controlled VTL1
Pole connects the anode of voltage-stabiliser tube D5 and one end of resistance R6, capacitor C6, and the other end ground connection of resistance R6, capacitor C6, resistance R7's is another
The other end of one termination capacitor C5, one end of another termination capacitor C8 of capacitor C7, resistance R9, another termination capacitor of resistance R8
One end of C9, resistance R10, resistance R9, capacitor C9 the other end ground connection, the other end of another terminating resistor R10 of capacitor C8 and
The output end of transport and placing device AR4.
Embodiment two, on the basis of example 1, the filtering output circuit use inductance L2 and capacitor C10, capacitor
It is exported after C11 composition π type filter circuit filtering, filters out signal noise, that is to say as in domestic video monitoring system controlling terminal
The thermal compensation signal of signal transmission passage output end signal, reduces signal errors in the way of thermal compensation signal, anti-stop signal disorder,
One end of a termination capacitor C10 of inductance L2 and the output end of transport and placing device AR4, another terminating resistor R11, the capacitor of inductance L2
The other end of C11, the other end ground connection of capacitor C10, capacitor C11, one end of another terminating resistor R12 of resistance R11 and pressure stabilizing
One end of pipe D10, the other end ground connection of voltage-stabiliser tube D10, another termination signal output port of resistance R12.
Embodiment three, on the basis of example 2, the frequency collection circuit 1, frequency collection circuit 2 select model
Signal frequency collector J1, the signal frequency collector J2 of SJ-ADC is acquired respectively to be believed in domestic video monitoring system controlling terminal
The analog signal of number transmission channel input terminal and output end both ends, which controlled in domestic video monitoring system
Terminal receives the channel of analog signal, and the frequency collection circuit 2 is formed with transport and placing device AR2- transport and placing device AR4 and capacitor C14
Loss compensation circuit to rectification calibration circuit output signal compensation, be further ensured that the consistency of signal, prevent thermal compensation signal and
Source signal current potential is inconsistent, improves the reliability of this circuit, one end of the power supply termination capacitor C1 of signal frequency collector J1 and
The ground terminal of power supply+5V, signal frequency collector J1 are grounded, the other end of the output termination capacitor C1 of signal frequency collector J1
With the cathode of one end of resistance R1, voltage-stabiliser tube D1, the plus earth of voltage-stabiliser tube D1, one end of another termination capacitor C2 of resistance R1
It is grounded with the other end of the anode of diode D2, capacitor C2, the cathode of diode D2 connects the anode of diode D4, and the frequency is adopted
Collector 2 includes the signal frequency collector J2 of model SJ-ADC, the power supply termination capacitor C12's of signal frequency collector J2
One end and power supply+5V, the ground terminal ground connection of signal frequency collector J2, the output termination capacitor C12 of signal frequency collector J2
The other end and one end of resistance R13, voltage-stabiliser tube D11 cathode, the plus earth of voltage-stabiliser tube D11, another termination of resistance R13
One end of capacitor C13 and the cathode of diode D12, the other end ground connection of capacitor C13, the plus earth of diode D12, resistance
The non-inverting input terminal of another termination transport and placing device AR2 of R14 and one end of resistance R16, the anti-phase input terminating resistor of transport and placing device AR2
One end of R15, capacitor C14, the output end of another termination transport and placing device AR3 of resistance R15, the output termination capacitor of transport and placing device AR2
The other end of C14 and the non-inverting input terminal of transport and placing device AR3, the one of the anti-phase input terminating resistor R17 of transport and placing device AR3, resistance R18
The non-inverting input terminal at end and transport and placing device AR4, the other end ground connection of resistance R18, the anti-phase input terminating resistor R17 of transport and placing device AR4,
The other end of resistance R16.
The present invention is when specifically used, a kind of domestic video monitoring system, including frequency collection circuit 1, frequency collection electricity
Road 2, rectification calibration circuit and filtering output circuit, the frequency collection circuit 1, frequency collection circuit 2 acquire family's view respectively
The analog signal of signal transmission passage input terminal and output end both ends, the signal transmission passage are in frequency monitoring system controlling terminal
Controlling terminal receives the channel of analog signal in domestic video monitoring system, and the rectification calibration circuit uses variable resistance RW1
Signal noise is eliminated to signal rectification with capacitor C4, capacitor C3 composition rectification circuit, while using triode Q1, triode Q2
Forming push-pull circuit reduces the conduction loss of signal, improves the switching speed of signal, and with diode D6- diode D9 and
Transport and placing device AR1 forms compound circuit to signal limiter-amplification-amplitude limiting processing, make signal have enough clipping depth (40~
50dB), using clipping and amplification alternately, and diode D6, diode D7 composition amplitude limiter circuit and diode D8, two
The amplitude limiter circuit of pole pipe D9 composition is symmetrical limiting, it is ensured that signal has enough passbands, most afterwards through capacitor C7- capacitor C9
It is filtered out after the signal of single-frequency in input filter output circuit with resistance R8- resistance R10 composition frequency selection circuit, guarantees signal
The stabilization of frequency in error range in order to further ensure signal potential forms anti-with voltage-stabiliser tube D5 and silicon-controlled VTL1
Current feed circuit detects abnormal signal, and abnormal signal, feedback abnormal signal to rectification are detected using the conducting voltage of silicon-controlled VTL1
In circuit, abnormal signal, stabilization signal amplitude are eliminated using bleeder circuit R2, the last filtering output circuit uses inductance L2
It exports, is that is to say as in domestic video monitoring system controlling terminal with after capacitor C10, capacitor C11 composition π type filter circuit filtering
The thermal compensation signal of signal transmission passage output end signal.
The above is that further detailed description of the invention, and it cannot be said that the present invention in conjunction with specific embodiment
Specific implementation is limited only to this；Belonging to the present invention and for those skilled in the technology concerned, it is being based on skill of the present invention
Under the premise of art scheme thinking, it is made expansion and operating method, data replacement, should all fall in the scope of the present invention it
It is interior.
Claims (3)
1. a kind of domestic video monitoring system, including frequency collection circuit 1, frequency collection circuit 2, rectification calibration circuit and filtering
Output circuit, it is characterised in that: the frequency collection circuit 1, frequency collection circuit 2 acquire domestic video monitoring system control respectively
The analog signal of signal transmission passage input terminal and output end both ends in terminal processed, the signal transmission passage are domestic video monitorings
Controlling terminal receives the channel of analog signal in system, and the rectification calibration circuit uses variable resistance RW1 and capacitor C4, capacitor
C3 forms rectification circuit to signal rectification, while the conducting of signal is reduced with triode Q1, triode Q2 composition push-pull circuit
Loss, and with diode D6- diode D9 and transport and placing device AR1 composition compound circuit to signal limiter-amplification-clipping at
Reason most inputs after capacitor C7- capacitor C9 and resistance R8- resistance R10 composition frequency selection circuit filters out the signal of single-frequency afterwards
It filters in output circuit, wherein the vibration of voltage-stabiliser tube D5 and silicon-controlled VTL1 composition feed circuit feedback regulation compound circuit output signal
Width, the frequency collection circuit 2 is with transport and placing device AR2- transport and placing device AR4 and capacitor C14 composition loss compensation circuit to rectification school
Quasi- circuit output signal compensation, the last filtering output circuit is with inductance L2 and capacitor C10, capacitor C11 composition π type filtering
It exports, is that is to say as the compensation of signal transmission passage output end signal in domestic video monitoring system controlling terminal after circuit filtering
Signal；
The rectification calibration circuit includes variable resistance RW1, and the contact 2 of variable resistance RW1 connects the cathode and capacitor of diode D4
One end of C3, capacitor C5, resistance R2, the contact 1 of variable resistance RW1 connect anode and one end of capacitor C4 of diode D3, two poles
The anode of pipe D4 connects the cathode of diode D3 and the other end of capacitor C4, capacitor C3, and the contact 3 of variable resistance RW1 connects triode
The base stage of Q1, triode Q2, the collector of triode Q1 meet power supply+5V, and the emitter of triode Q1 connects the transmitting of triode Q2
The anode of the cathode of pole and diode D7, diode D6, the collector of triode Q2 connect one end of variable resistance R3, variable resistance
The other end of R3 is grounded, one end of the positive connecting resistance R4 of diode D7 and the cathode of diode D6, transport and placing device AR1 it is same mutually defeated
Enter end, one end of the anti-phase input terminating resistor R5 of transport and placing device AR1, the other end ground connection of resistance R5, the output end of transport and placing device AR1
The anode of the cathode of the other end of connecting resistance R4 and diode D9, diode D8, the anode of diode D9 connect the negative of diode D8
The anode of pole, the cathode of voltage-stabiliser tube D5 and resistance R8, one end of capacitor C7 and silicon-controlled VTL1, the cathode of silicon-controlled VTL1 connect
One end of resistance R7, the control electrode of silicon-controlled VTL1 connect voltage-stabiliser tube D5 anode and resistance R6, capacitor C6 one end, resistance R6,
The other end of capacitor C6 is grounded, the other end of another termination capacitor C5 of resistance R7, another termination capacitor C8, the resistance of capacitor C7
One end of R9, one end of another termination capacitor C9 of resistance R8, resistance R10, the other end ground connection of resistance R9, capacitor C9, capacitor
The other end of another terminating resistor R10 of C8 and the output end of transport and placing device AR4.
2. a kind of domestic video monitoring system according to claim 1, it is characterised in that: the filtering output circuit includes
One end of a termination capacitor C10 of inductance L2, inductance L2 and the output end of transport and placing device AR4, another terminating resistor of inductance L2
The other end of R11, capacitor C11, the other end ground connection of capacitor C10, capacitor C11, the one of another terminating resistor R12 of resistance R11
The one end at end and voltage-stabiliser tube D10, the other end ground connection of voltage-stabiliser tube D10, another termination signal output port of resistance R12.
3. a kind of domestic video monitoring system according to claim 2, it is characterised in that: the frequency collection circuit 1 is wrapped
Include the signal frequency collector J1 of model SJ-ADC, one end of the power supply termination capacitor C1 of signal frequency collector J1 and power supply
The ground terminal of+5V, signal frequency collector J1 are grounded, the other end and electricity of the output termination capacitor C1 of signal frequency collector J1
Hinder one end of R1, the cathode of voltage-stabiliser tube D1, the plus earth of voltage-stabiliser tube D1, one end and two of another termination capacitor C2 of resistance R1
The anode of pole pipe D2, the other end ground connection of capacitor C2, the cathode of diode D2 connect the anode of diode D4；
The frequency collection circuit 2 includes the signal frequency collector J2 of model SJ-ADC, the electricity of signal frequency collector J2
One end of source termination capacitor C12 and power supply+5V, the ground terminal ground connection of signal frequency collector J2, signal frequency collector J2's
Export the cathode of the other end of termination capacitor C12 and one end of resistance R13, voltage-stabiliser tube D11, the plus earth of voltage-stabiliser tube D11, electricity
One end of another termination capacitor C13 of R13 and the cathode of diode D12 are hindered, the other end of capacitor C13 is grounded, diode D12's
Plus earth, the non-inverting input terminal of another termination transport and placing device AR2 of resistance R14 and one end of resistance R16, transport and placing device AR2's is anti-
Mutually one end of input terminating resistor R15, capacitor C14, the output end of another termination transport and placing device AR3 of resistance R15, transport and placing device AR2
Output termination capacitor C14 the other end and transport and placing device AR3 non-inverting input terminal, the anti-phase input terminating resistor of transport and placing device AR3
R17, one end of resistance R18 and transport and placing device AR4 non-inverting input terminal, resistance R18 the other end ground connection, the reverse phase of transport and placing device AR4
Input the other end of terminating resistor R17, resistance R16.
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| CN201910306587.1A CN109889795B (en) | 2019-04-17 | 2019-04-17 | Household video monitoring system |
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| CN201910306587.1A CN109889795B (en) | 2019-04-17 | 2019-04-17 | Household video monitoring system |
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| CN110266291A (en) * | 2019-06-26 | 2019-09-20 | 郑州工程技术学院 | A kind of industrial control system based on Internet of Things |
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| CN110324431A (en) * | 2019-07-17 | 2019-10-11 | 郑州工程技术学院 | A kind of user data management system based on cloud computing |
| CN110348796A (en) * | 2019-07-25 | 2019-10-18 | 郑州航空工业管理学院 | Logistics information collection system |
| CN110348796B (en) * | 2019-07-25 | 2021-09-07 | 郑州航空工业管理学院 | Logistics information acquisition system |
| CN110290359A (en) * | 2019-07-31 | 2019-09-27 | 深圳市众安威视技术有限公司 | A kind of camera signals Transmission system |
| CN110517464A (en) * | 2019-08-29 | 2019-11-29 | 河南胜凡信息科技有限公司 | Clinical nurse timed reminding calling device |
| CN110887869A (en) * | 2019-11-29 | 2020-03-17 | 苏业梅 | KYN type high-voltage board dew point detection circuitry |
| CN110968012A (en) * | 2019-12-26 | 2020-04-07 | 郑州科技学院 | Electronic signal compensation device |
| CN111181514A (en) * | 2020-02-29 | 2020-05-19 | 李韬 | Signal calibration device of medical endoscope |
| 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 |
| CN113179394A (en) * | 2021-04-30 | 2021-07-27 | 深圳市金乾象科技有限公司 | Remote video monitoring device |
Also Published As
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|---|---|
| CN109889795B (en) | 2020-09-18 |
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Granted publication date: 20200918 |