CN204272243U - A kind of analog video systems - Google Patents
A kind of analog video systems Download PDFInfo
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- CN204272243U CN204272243U CN201420867419.2U CN201420867419U CN204272243U CN 204272243 U CN204272243 U CN 204272243U CN 201420867419 U CN201420867419 U CN 201420867419U CN 204272243 U CN204272243 U CN 204272243U
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- analog video
- filter
- power supply
- video camera
- ground wire
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Abstract
The utility model relates to a kind of analog video systems, although in order to solve in the analog video systems that exists in prior art on analog video signal, add video isolation module can the invariably interference phenomenon that causes of loop, but can analog video signal be affected, also can affect the coaxial control signal be superimposed upon on analog video signal simultaneously, increase the coaxial problem controlling failure rate.System of the present utility model comprises: analog video camera, for power supply adaptor, filter and the back-end processing system of powering for analog video camera; Wherein power supply adaptor is connected with filter; Filter is connected with analog video camera; Analog video camera is connected with back-end processing system.The analog video systems that the utility model provides can not only the invariably interference that causes of loop, and all can not have an impact to the analog video signal in analog video systems and coaxial control signal, and then reduces and coaxially control failure rate.
Description
Technical field
The utility model relates to video field, particularly relates to a kind of analog video systems.
Background technology
In analog video systems scheme, front end analogue video camera sends analog video signal, through cable transmission to back-end processing system, signal refluxes from ground wire, but at the wiring had, construction site, a more than bars return flow path, return flow path is more, longer, ground loop is more, and noise becomes complicated, more easily causes interference.Along with the release of simulation high definition scheme, the video interference problem that ground loop causes is more and more obvious, and can intentional or unintentional introducing ground loop when connecting up.
In order to the video interference problem that solving earth loop causes, current method is in vision signal, add video isolation module, disconnects ground loop, vision signal is refluxed from single-pathway, avoids interference phenomenon and occurs.But along with the rise of simulation high definition, require to improve to video isolation scheme bandwidth performance, design difficulty and cost all can increase, in order to meet performance index, during design video isolation module, need to add some resistance, capacitor element, the direct current biasing of analog video signal can be affected like this, cause the coaxial control signal direct current biasing be superimposed upon on analog video signal be elevated or reduce, occur coaxially controlling Problem of Failure, during Long line transmission, the coaxial failure risk that controls occurs to be increased.Meanwhile, because analog video signal can not be coupled over completely by isolating transformer in limited bandwidth, this solution also can affect analog video signal.
In sum, although adding video isolation module in existing analog video systems on analog video signal can the invariably interference phenomenon that causes of loop, but can analog video signal be affected, also can affect the coaxial control signal be superimposed upon on analog video signal simultaneously, increase and coaxially control failure rate.
Utility model content
The utility model provides a kind of analog video systems, although in order to solve in the analog video systems that exists in prior art on analog video signal, add video isolation module can the invariably interference phenomenon that causes of loop, but can analog video signal be affected, also can affect the coaxial control signal be superimposed upon on analog video signal simultaneously, increase the coaxial problem controlling failure rate.
The utility model embodiment provides a kind of analog video systems, and this system comprises:
Analog video camera, for power supply adaptor, filter and the back-end processing system of powering for described analog video camera;
Wherein, described power supply adaptor is connected with described filter;
Described filter is connected with described analog video camera;
Described analog video camera is connected with described back-end processing system.
Because the analog video systems in the utility model embodiment adds a filter between analog video camera and power supply adaptor, this filter can carry out filtering process to the return flow path introduced due to earth cord network, thus suppresses the noise jamming on this return flow path.Compared with prior art, the analog video systems that the utility model provides is between analog video camera and power supply adaptor, add a filter, and the analog video signal in system is not acted on, thus can not only the invariably interference that causes of loop, and all can not have an impact to the analog video signal in analog video systems and coaxial control signal, and then reduce and coaxially control failure rate.
Preferably, described filter is low pass filter.
Because the filter in the utility model embodiment is low pass filter, thus the function of low-pass filtering can be realized, high-impedance behavior is presented to noise frequency component, enough low frequency component is only allowed to pass through, electric current on the signal return flow path that ground loop can be made to introduce is essentially 0, and then avoids the interference phenomenon because ground loop causes.
Preferably, described filter comprises: low-frequency choke coil;
One end of described low-frequency choke coil is connected with described analog video camera, and the other end is connected with described power supply adaptor.
Preferably, described filter also comprises: the first electric capacity and the second electric capacity;
One end of described first electric capacity is connected with the power line of described analog video camera, and the other end is connected with the ground wire of described analog video camera;
One end of described second electric capacity is connected with the power line of described power supply adaptor, and the other end is connected with the ground wire of described power supply adaptor.
Preferably, described filter comprises: two for suppressing the element of high-frequency noise;
One end of element described in one of them is connected with the power line of described analog video camera, and the other end is connected with the power line of described power supply adaptor;
One end of element described in another is connected with the ground wire of described analog video camera, and the other end is connected with the ground wire of described power supply adaptor.
Preferably, described filter also comprises: the 3rd electric capacity and the 4th electric capacity;
One end of described 3rd electric capacity is connected with the power line of described analog video camera, and the other end is connected with the ground wire of described analog video camera;
One end of described 4th electric capacity is connected with the power line of described power supply adaptor, and the other end is connected with the ground wire of described power supply adaptor.
Preferably, described element is inductance or magnetic bead.
Preferably, described filter is magnetic core.
Preferably, described filter is less to the distance of described power supply adaptor than described filter to the distance of described analog video camera.
Preferably, described system also comprises earth cord network;
Ground wire in described earth cord network is connected with the ground wire of described power supply adaptor input; And/or
Ground wire in described earth cord network is connected with the ground wire of described power supply adaptor output.
Because described filter is when mounted more near analog video camera one end, and this section as far as possible making the ground wire in earth cord network be positioned at filter to be connected with power supply adaptor, thus the interference that the analog video systems in the utility model embodiment can not only suppress ground loop to cause, can also suppress the output noise of power supply itself simultaneously.
Accompanying drawing explanation
The structural representation of the analog video systems that Fig. 1 provides for the utility model embodiment;
The ground loop filtering schematic diagram of the analog video systems that Fig. 2 provides for the utility model embodiment;
The principle schematic of the signal backflow filtering that Fig. 3 provides for the utility model embodiment;
The detailed construction schematic diagram of the first filter that Fig. 4 provides for the utility model embodiment;
The detailed construction schematic diagram of the second filter that Fig. 5 provides for the utility model embodiment;
The detailed construction schematic diagram of the third filter that Fig. 6 provides for the utility model embodiment.
Embodiment
The utility model relates to a kind of analog video systems, although in order to solve in the analog video systems that exists in prior art on analog video signal, add video isolation module can the invariably interference phenomenon that causes of loop, but can analog video signal be affected, also can affect the coaxial control signal be superimposed upon on analog video signal simultaneously, increase the coaxial problem controlling failure rate.This system comprises: analog video camera, for power supply adaptor, filter and the back-end processing system of powering for analog video camera; Wherein, power supply adaptor is connected with filter; Filter is connected with analog video camera; Analog video camera is connected with back-end processing system.The analog video systems that the utility model provides is between analog video camera and power supply adaptor, add a filter, thus can not only the invariably interference that causes of loop, and all can not have an impact to the analog video signal in analog video systems and coaxial control signal, and then reduce and coaxially control failure rate.
Below in conjunction with Figure of description, the utility model embodiment is described in further detail.Should be appreciated that preferred embodiment described herein is only for instruction and explanation of the utility model, and be not used in restriction the utility model.
As shown in Figure 1, the analog video systems that the utility model embodiment provides comprises: analog video camera 101, for power supply adaptor 102, filter 103 and the back-end processing system 104 of powering for analog video camera;
Wherein, power supply adaptor 102 is connected with filter 103;
Filter 103 is connected with analog video camera 101;
Analog video camera 101 is connected with back-end processing system 104.
Along with the release of simulation high definition scheme, the video interference that ground loop causes is more and more obvious, and can introduce ground loop when connecting up.Such as, during analog video camera 101 centrally connected power supply, multiple stage analog video camera 101 shares a power supply, the power supply ground of analog video camera 101 and signal ground are all connected together, and analog video signal is all received on same back-end processing system 104 by different cables, or the analog video camera 101 of at least two or more is received on same back-end processing system 104, many or a ground loop will be introduced.If the adapter giving simulation shooting power supply is non-isolated, namely the ground that direct current exports is communicated with the ground of civil power, and the power supply of back-end processing system 104 power supply or display device is also non-isolated, by civil power zone network, even if only connect an analog video camera 101, also there will be ground loop.And some ground loop noise is very large, various frequency component noise is difficult to prediction, and as the loop through civil power ground, more easily introduce interference, cause image abnormity, twill, band, noise, distortion etc. appear in image.
In enforcement, the analog video systems that the utility model embodiment provides is on the basis of conventional analog video system, a filter 103 is added, for solving in analog video systems due to video interference problem that ground loop causes between power supply adaptor 102 and analog video camera 101.The processing mode of adding video isolation module on analog video signal that prior art adopts, mainly from signal angle loop isolator, and the utility model suppresses ground loop from the angle of power supply, also same effect can be reached, simultaneously, adopt the analog video systems that the utility model embodiment provides, can not only the invariably interference that causes of loop, and all can not have an impact to the analog video signal in analog video systems and coaxial control signal, and then reduce and coaxially control failure rate.
The utility model is considered from the angle of system, the scheme of carrying out filtering to power supply proposing a kind of simple, low cost solves the video interference problem that ground loop causes, thus avoid some limitation of existing video isolation module solution, can not produce any impact to analog video signal, adaptability is stronger.As shown in Figure 2, the ground loop filtering schematic diagram of the analog video systems provided for the utility model embodiment.
In enforcement, as shown in Figure 2, signal from analog video camera 101 exports through holding wire and is sent to back-end processing system 104, under normal circumstances, signal returns analog video camera 101 back up through ground wire 0, if but introduce earth cord network, then also having a return flow path gets back on video camera through ground wire 1, earth cord network, ground wire 2 or ground wire 3, ground wire 4, ground wire 5, if on this return flow path, noise is serious, will cause video interference problem, so the utility model carries out filtering process for this return flow path, restraint speckle disturbs.
Concrete, the installation site of analog video systems median filter 103 be there are certain requirements, be specifically introduced below.
Preferably, filter 103 is less to the distance of power supply adaptor 102 than filter 103 to the distance of analog video camera 101.
That is, in specific implementation process, the position that filter 103 will try one's best near analog video camera 101 when connecting so that the noise of filter out power itself and the better effects if of noise that causes of loop.
Preferably, system also comprises earth cord network;
Ground wire in earth cord network is connected with the ground wire of power supply adaptor 102 input; And/or
Ground wire in earth cord network is connected with the ground wire of power supply adaptor 102 output.
Concrete, in analog video systems may due to site operation, wiring and to be present in analog video systems from analog video camera 101 to the ground wire quantity of back-end processing system 104 one and more than, and form earth cord network.
Such as, if the adapter giving simulation shooting power supply is non-isolated, namely the ground that direct current exports is communicated with the ground of civil power, and the power supply of back-end processing system 104 power supply or display device is also non-isolated, by the earth cord network that the ground wire inside civil power is introduced, even if only connect an analog video camera 101, also there will be ground loop.Namely as shown in Figure 2, the return flow path be made up of ground wire 1, earth cord network, ground wire 3, ground wire 4, ground wire 5.That is, the ground wire 3 in earth cord network is connected with the ground wire of power supply adaptor 102 input.
During analog video camera 101 centrally connected power supply, multiple stage analog video camera 101 shares a power supply, the power supply ground of analog video camera 101 and signal ground are all connected together, and analog video signal is all received on same back-end processing system 104 by different cables, or the analog video camera 101 of at least two or more is received on same back-end processing system 104, many or a ground loop will be introduced.Namely as shown in Figure 2, the return flow path be made up of ground wire 1, earth cord network, ground wire 2, ground wire 4, ground wire 5.That is, the ground wire 2 in earth cord network is connected with the ground wire of power supply adaptor 102 output.
In enforcement, above-mentioned two situations possibility individualism, also may exist simultaneously, that is, the return flow path be made up of ground wire 1, earth cord network, ground wire 3, ground wire 4, ground wire 5, and the return flow path to be made up of ground wire 1, earth cord network, ground wire 2, ground wire 4, ground wire 5 may individualism, also may exist simultaneously; Meanwhile, when selecting power supply adaptor 102, according to the needs of practical application, the input of the power supply adaptor 102 of selection and the ground wire of output can communicate, and also can not communicate.
The principle of the signal backflow filtering provided for the utility model embodiment below is simply introduced.
As shown in Figure 3, the principle schematic of the signal backflow filtering provided for the utility model embodiment; Wherein, impedance 0 and impedance 1 are all the functions about frequency, and its resistance value is different at different frequencies.Signal line impedance is holding wire equiva lent impedance in Fig. 3.Impedance 0 is the equiva lent impedance of ground wire 0 in Fig. 3.Impedance 1 is the equiva lent impedance that ground wire 1 in Fig. 3, earth cord network, ground wire 2 or ground wire 3, ground wire 4, filter 103 and ground wire 5 are added up, and wherein, filter 103 pairs of impedances 1 play a leading role.The electric current flowing through these three paths is respectively I
s, I
0and I
1, and I
s=I
0+ I
1.
That is, the requirement of filter 103 design: make impedance 1 much larger than impedance 0 in certain frequency range, such I
0will much larger than I
1, so I
sbackflow substantially all from I
0backflow, I
1very little, negligible, the interference reduction that backflow is caused, to minimum, meets application request.
Preferably, filter 103 is low pass filter 103.
In enforcement, in order to the noise jamming that better filtering ground loop causes, the utility model adopts low pass filter 103, realize low-pass filtering function, high-impedance behavior is presented to noise frequency component, only allow enough low frequency component to pass through, signal can be made to reflux and be substantially all back to analog video camera 101 one end through ground wire 0, and then the interference problem because ground loop causes can be avoided
The filter 103 that analog video systems of the present utility model comprises; based on filter function; be not restricted to circuit or the device of certain form; as long as its effect is consistent with the functional description of the utility model median filter 103; that is this filter 103 can be substituted with the specific components and parts meeting function; its essential effect is consistent, all belongs to protection range of the present utility model.Lower mask body introduces several filter that can suppress earth loop interference.
As shown in Figure 4, the detailed construction schematic diagram of the first filter provided for the utility model embodiment.
Concrete, filter 103 comprises: low-frequency choke coil 401;
One end of low-frequency choke coil 401 is connected with analog video camera 101, and the other end is connected with power supply adaptor 102.
The first filter 103 that the utility model embodiment provides is a low-frequency choke coil L
1, wherein one end connecting analog video camera 101 of low-frequency choke coil 401, the output of the low-frequency choke coil 401 namely in Fig. 4 is connected with analog video camera 101; And one end connects power supply adaptor 102 in addition, indicate one end of two stains in the choke 401 namely in Fig. 4, namely the input of low-frequency choke coil 401 is connected with power supply adaptor 102.In enforcement, there is one end of two stains in low-frequency choke coil 401 and do not have the connected mode of one end of two stains to exchange, the one end being about to two stains is connected with analog video camera 101, one end of two stains is not had to be connected with power supply adaptor 102, that is, low-frequency choke coil 401 does not have directive requirement when mounted, and two ends can be connected with analog video camera 101 or power supply adaptor 102 arbitrarily.
Circuit as shown in Figure 4, when transmitting direct current and difference mode signal, can suppress the common mode signal noise because ground loop causes, common-mode noise appears at low-frequency choke coil L
1input, do not appear at low-frequency choke coil L
1output.At selection low-frequency choke coil L
1time, make inductance value L as far as possible large, equiva lent impedance R is as far as possible little, meets L>>R/f, and wherein f is noise frequency.Such as, inductance value L can be selected as required to be 5mH ~ 30mH or larger, to make L meet L>10*R/f as far as possible.When external power supply device 103 after filtering, when sending analog video camera 101 again to, noise more than cut-off frequency all can be attenuated, the signal lower than cut-off frequency is only allowed to pass through, likely also interference signal is had in this part signal passed through, so need cut-off frequency to do enough low, ensure to only have DC component by this filter 103.
As shown in Figure 5, be the detailed construction schematic diagram of the second filter that the utility model embodiment provides, namely on Fig. 4 basis, added two electric capacity.Lower mask body is introduced.
Preferably, filter 103 also comprises: the first electric capacity 402 and the second electric capacity 403;
One end of first electric capacity 402 is connected with the power line of analog video camera, and the other end is connected with the ground wire of analog video camera;
One end of second electric capacity 403 is connected with the power line of power supply adaptor, and the other end is connected with the ground wire of power supply adaptor.
In enforcement, filter 103 can add two electric capacity on the basis of Fig. 4 low-frequency choke coil 401, i.e. electric capacity C
1(the first electric capacity 402) and C
2(the second electric capacity 403), wherein, if the electric capacity selected is polarity free capacitor, then one end 5 of the first electric capacity 402 is connected with the power line of analog video camera 101, and the other end 6 is connected with the ground wire of analog video camera 101; One end 7 of second electric capacity 403 is connected with the power line of power supply adaptor 102, and the other end 8 is connected with the ground wire of power supply adaptor 102.If select the electric capacity added to be polar capacitor in implementing, then will notice that the positive pole of electric capacity will be connected with power line, negative pole will be connected with ground wire.
During concrete enforcement, can by selecting two the electric capacity C added
1, C
2what the cut-off frequency of filter 103 was tried one's best is low, and that is, the second filter 103 that the utility model embodiment provides is by device C
1, C
2and L
1composition, C
1, C
2can select according to the actual requirements not add (i.e. the first filter above-mentioned), meet practical application request.
In addition, the filter 103 in the analog video systems that the utility model embodiment provides, the circuit that also can be made up of components and parts such as inductance, magnetic bead, electric capacity or single components and parts form.Lower mask body is introduced.
Preferably, filter 103 comprises: two for suppressing the element of high-frequency noise;
One end of one of them element is connected with the power line of analog video camera 101, and the other end is connected with the power line of power supply adaptor 102;
One end of another element is connected with the ground wire of analog video camera 101, and the other end is connected with the ground wire of power supply adaptor 102.
The filter 103 that the utility model embodiment provides also can for two elements for suppressing high-frequency noise, concrete connected mode is that an element is connected between the power line of analog video camera 101 power line and power supply adaptor 102, and another element is connected between the ground wire of analog video camera 101 ground wire and power supply adaptor 102.
According to actual needs, also can add two electric capacity at above-mentioned two on the filter suppressing the element of high-frequency noise to form, seemingly, lower mask body is introduced for connected mode and above-mentioned the second filter class.
Preferably, filter 103 also comprises: the 3rd electric capacity 603 and the 4th electric capacity 604;
One end of 3rd electric capacity 603 is connected with the power line of analog video camera 101, and the other end is connected with the ground wire of analog video camera 101;
One end of 4th electric capacity 604 is connected with the power line of power supply adaptor 102, and the other end is connected with the ground wire of power supply adaptor 102.
Concrete, with the capacitance kind in the second filter seemingly, two electric capacity of interpolation can be polar capacitors, can also be also polarity free capacitors, by selecting two the electric capacity C added
1and C
2what the cut-off frequency of filter 103 was tried one's best is low, wherein, and electric capacity C
1and C
2size can be the same or different, such as, capacitance size can be selected for being greater than 47 μ F.
As shown in Figure 6, the detailed construction schematic diagram of the third filter provided for the utility model embodiment; Namely filter 103 forms for suppressing the element of high-frequency noise and two electric capacity by two.Concrete, one end 1 of one of them element 601 is connected with the power line of analog video camera 101, and the other end 2 is connected with the power line of power supply adaptor 102; And one end 3 of another element 602 is connected with the ground wire of analog video camera 101 in figure, the other end 4 is connected with the ground wire of power supply adaptor 102.If the electric capacity C selected
1(the 3rd electric capacity 603) and C
2(the 4th electric capacity 604) is polarity free capacitor, then electric capacity C
1the one end 5 of (the 3rd electric capacity 603) is connected with the power line of analog video camera 101, and the other end 6 is connected with the ground wire of analog video camera 101; Electric capacity C
2the one end 7 of (the 4th electric capacity 604) is connected with the power line of power supply adaptor 102, and the other end 8 is connected with the ground wire of power supply adaptor 102.The electric capacity C added if select in implementing
1and C
2be polar capacitor, also should be noted that the positive pole of electric capacity will be connected with power line, negative pole will be connected with ground wire.
During concrete enforcement, can by selecting two the electric capacity C added
1, C
2what the cut-off frequency of filter 103 was tried one's best is low, that is, the third filter 103 that the utility model embodiment provides by two for suppressing the element of high-frequency noise, and electric capacity C
1, C
2composition, C
1, C
2can select according to the actual requirements not add, meet practical application request.
In enforcement, two of selection can be two inductance or magnetic bead for suppressing the element of high-frequency noise, lower mask body introduction.
Preferably, element is inductance or magnetic bead.
That is, element 601 as shown in Figure 6 and element 602 can be that inductance or magnetic bead etc. are for suppressing the element of high-frequency noise.When wherein selecting inductance, the size of the inductance value of inductance also can select inductance value L to be 5mH ~ 30mH or larger as required, makes L meet L>10*R/f as far as possible.
In enforcement, two elements in the embodiment of the present invention are not limited to just inductance and magnetic bead, and other may be used for the element suppressing high-frequency noise, as long as the device that can realize suppressing ground loop noise to disturb can.
Filter 103 in the analog video systems that the utility model embodiment provides, except with except low-frequency choke coil and electric capacity composition, can also replacing with a magnetic core.
Preferably, filter 103 is magnetic cores.
In enforcement, filter 103 can be made up of a magnetic core, and wherein the operating frequency range of magnetic core is enough wide.During use, can by a power line on magnetic core to reach the function of filtering; Meanwhile, also can, by multi-group power cable around on same magnetic core, adopt in this way, a magnetic core can provide filter action for multiple power supply, can not only eliminate the noise jamming that ground loop causes, also can be cost-saving.
The analog video systems that the utility model provides is between analog video camera and power supply adaptor, add a filter, thus can not only the invariably interference that causes of loop, and all can not have an impact to the analog video signal in analog video systems and coaxial control signal, and then reduce and coaxially control failure rate.While the interference that ground loop can be suppressed to cause, the output noise of power supply itself can also be suppressed.
Although described preferred embodiment of the present utility model, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the utility model scope.
Obviously, those skilled in the art can carry out various change and modification to the utility model and not depart from spirit and scope of the present utility model.Like this, if these amendments of the present utility model and modification belong within the scope of the utility model claim and equivalent technologies thereof, then the utility model is also intended to comprise these change and modification.
Claims (10)
1. an analog video systems, is characterized in that, this system comprises:
Analog video camera, for power supply adaptor, filter and the back-end processing system of powering for described analog video camera;
Wherein, described power supply adaptor is connected with described filter;
Described filter is connected with described analog video camera;
Described analog video camera is connected with described back-end processing system.
2. system as described in claim 1, it is characterized in that, described filter is low pass filter.
3. system as described in claim 2, it is characterized in that, described filter comprises: low-frequency choke coil;
One end of described low-frequency choke coil is connected with described analog video camera, and the other end is connected with described power supply adaptor.
4. system as described in claim 2, it is characterized in that, described filter also comprises: the first electric capacity and the second electric capacity;
One end of described first electric capacity is connected with the power line of described analog video camera, and the other end is connected with the ground wire of described analog video camera;
One end of described second electric capacity is connected with the power line of described power supply adaptor, and the other end is connected with the ground wire of described power supply adaptor.
5. system as described in claim 1, it is characterized in that, described filter comprises: two for suppressing the element of high-frequency noise;
One end of element described in one of them is connected with the power line of described analog video camera, and the other end is connected with the power line of described power supply adaptor;
One end of element described in another is connected with the ground wire of described analog video camera, and the other end is connected with the ground wire of described power supply adaptor.
6. system as described in claim 5, it is characterized in that, described filter also comprises: the 3rd electric capacity and the 4th electric capacity;
One end of described 3rd electric capacity is connected with the power line of described analog video camera, and the other end is connected with the ground wire of described analog video camera;
One end of described 4th electric capacity is connected with the power line of described power supply adaptor, and the other end is connected with the ground wire of described power supply adaptor.
7. system as described in claim 6, it is characterized in that, described element is inductance or magnetic bead.
8. system as described in claim 1, it is characterized in that, described filter is magnetic core.
9. the system described in as arbitrary in claim 1 ~ 8, it is characterized in that, described filter is less to the distance of described power supply adaptor than described filter to the distance of described analog video camera.
10. the system described in as arbitrary in claim 1 ~ 8, it is characterized in that, described system also comprises earth cord network;
Ground wire in described earth cord network is connected with the ground wire of described power supply adaptor input; And/or
Ground wire in described earth cord network is connected with the ground wire of described power supply adaptor output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420867419.2U CN204272243U (en) | 2014-12-30 | 2014-12-30 | A kind of analog video systems |
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|---|---|---|---|
| CN201420867419.2U CN204272243U (en) | 2014-12-30 | 2014-12-30 | A kind of analog video systems |
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| CN204272243U true CN204272243U (en) | 2015-04-15 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105553047A (en) * | 2016-02-24 | 2016-05-04 | 广东欧珀移动通信有限公司 | Vehicle charger circuit and vehicle charger |
| CN112055960A (en) * | 2018-05-02 | 2020-12-08 | 华为技术有限公司 | Terminal camera protection circuit |
| EP3876498A1 (en) * | 2020-03-06 | 2021-09-08 | IC Events Inc. | Apparatus and method for transmitting multiple on-demand audio streams locally to web-enabled devices |
| CN117175930A (en) * | 2023-11-03 | 2023-12-05 | 杭州海康威视数字技术股份有限公司 | Interference suppression module for monitoring system |
-
2014
- 2014-12-30 CN CN201420867419.2U patent/CN204272243U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105553047A (en) * | 2016-02-24 | 2016-05-04 | 广东欧珀移动通信有限公司 | Vehicle charger circuit and vehicle charger |
| CN112055960A (en) * | 2018-05-02 | 2020-12-08 | 华为技术有限公司 | Terminal camera protection circuit |
| EP3876498A1 (en) * | 2020-03-06 | 2021-09-08 | IC Events Inc. | Apparatus and method for transmitting multiple on-demand audio streams locally to web-enabled devices |
| CN117175930A (en) * | 2023-11-03 | 2023-12-05 | 杭州海康威视数字技术股份有限公司 | Interference suppression module for monitoring system |
| CN117175930B (en) * | 2023-11-03 | 2024-01-26 | 杭州海康威视数字技术股份有限公司 | Interference suppression module for monitoring system |
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