CN201830380U - Anti-jamming device - Google Patents
Anti-jamming device Download PDFInfo
- Publication number
- CN201830380U CN201830380U CN2010205393593U CN201020539359U CN201830380U CN 201830380 U CN201830380 U CN 201830380U CN 2010205393593 U CN2010205393593 U CN 2010205393593U CN 201020539359 U CN201020539359 U CN 201020539359U CN 201830380 U CN201830380 U CN 201830380U
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- Prior art keywords
- multiplying arrangement
- vision signal
- suppressor
- signal
- video signal
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- Expired - Fee Related
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Abstract
The utility model provides an anti-jamming device, relating to the technical field of security products. The basic structure is as follows: the anti-jamming device comprises amplification equipment and a voltage division circuit connected by a cable; a video signal is firstly amplified by the amplification equipment, a jamming signal is transmitted to the voltage division circuit after being overlaid with the amplified video signal in the signal transmission, the intensity of the video signal to which voltage division is carried out by the voltage division circuit is the same as the intensity of the video signal before the video signal is amplified by the amplification equipment. In the anti-jamming device, the transmission quality of the video signal is obviously improved, the manufacturing process is simple, and the installation and usage are simple, safe, convenient and reliable.
Description
[technical field]
The utility model relates to the security product technical field, relates in particular to a kind of suppressor.
[background technology]
Suppressor uses on the composite video signal transmission system, is used to eliminate interference and prolongation transmission of video signals distance in the safety defense monitoring system vision signal.
For example arranged cables such as power, illumination, fan, control, communication usually in wiring channel positions such as elevator, various cables all can produce electromagnetic radiation.The used coaxial cable of video signal transmission also can " reception " these interference, be that interfere with electromagnetic field produces the interference induced current on coaxial cable, this disturbs induced current also will produce interference inductive voltage (electromotive force) on coaxial cable outer conductor (mesh grid) longitudinal electrical resistance, this interference inductive voltage just is connected in the video signal transmission loop, forms to disturb.
Suppressor in the prior art scheme one is to adopt passive low ventilating filter, the signal beyond the shared frequency band range of filtering vision signal.Described passive low ventilating filter is made up of inductance capacitance, directly is installed in the video reception terminal, by the out-of-band High-frequency Interference of described low pass filter filters out.In actual use because the installation environment of different circuits has different interference sources, when the frequency spectrum of the signal that interference source sends at 6MHz with in interior, vision signal can be interfered, and causes the signal deformity.Passive low ventilating filter can't play effect like this, and passive low ventilating filter can increase the decay of vision signal.
Suppressor in the prior art scheme two is considered what how interference signal was disturbed transmission line with the common mode form, and the coaxial cable that video signal transmission is used transmission is a kind of unbalanced mode transmission, therefore than the influence that is easier to receive the external interference signal.General interference signal converts non-equilibrium transmission to balance transmission, and the characteristic of utilizing operational amplifier to have anti-common mode disturbances is again removed interference.The shortcoming of this technical scheme is when installation environment is found interference signal is arranged, and change coaxial cable into twisted-pair feeder, has increased difficulty of construction and expense; Twisted-pair feeder is made transmission line has stronger inhibition ability to the electromagnetic induction noise, but electrostatic induction is caused that capability of restraining noise is relatively poor, and is difficult to accomplish the complete equipilibrium transmission.In addition, the mutual conversion portion circuit structure of balance and non-equilibrium signal complexity, components and parts cost height.
[utility model content]
The technical problems to be solved in the utility model be to provide a kind of can be simply and effectively improve the suppressor of video signal transmission quality.
The utility model suppressor solves above-mentioned technical problem by such technical scheme:
A kind of suppressor, it comprises multiplying arrangement and the bleeder circuit that connects by cable; After vision signal is at first amplified by multiplying arrangement, be transferred to bleeder circuit after interference signal and the vision signal stack that is exaggerated, by the vision signal intensity after the bleeder circuit dividing potential drop with the same by multiplying arrangement vision signal intensity before.
As further improvement of the utility model, described multiplying arrangement is arranged on the vision signal transmitting terminal, and bleeder circuit is arranged on the video reception end.
As further improvement of the utility model, described multiplying arrangement connects power supply circuits, and described power supply circuits comprise rectification circuit and the reduction voltage circuit that is connected in series, and reduction voltage circuit is connected to multiplying arrangement.
As further improvement of the utility model, described suppressor also comprises an anti-high voltage protective device, and it is connected with multiplying arrangement, and vision signal is at first amplified by multiplying arrangement by anti-high voltage protective device again.
As further improvement of the utility model, described multiplying arrangement comprises a plurality of triodes.
Compared with prior art, the utility model suppressor can obviously improve video signal transmission quality, and manufacturing process is simple, installs and uses simple, safety, convenient and reliable.
[description of drawings]
Fig. 1 is the connection diagram of the utility model suppressor.
Fig. 2 is the cut-away view of the utility model suppressor.
[embodiment]
Describe embodiment of the present utility model in detail below in conjunction with accompanying drawing.
See also Fig. 1, the invention provides a kind of suppressor, described suppressor comprises the multiplying arrangement 10 that is arranged on the vision signal transmitting terminal and at the bleeder circuit 20 of video reception end.
Suppose that Vi is the vision signal intensity of video equipment output, A is the multiple of anti-interference amplification video signal, and Δ V is an interference signal intensity in the video signal transmission process.The vision signal Vi of vision signal transmitting terminal at first amplifies by multiplying arrangement 10 and then carries out remote transmission by coaxial cable, and vision signal Vi is by behind the multiplying arrangement 10, and vision signal is exaggerated A doubly, i.e. (Vi*A).Suppose the signal signal (± Δ V) that in transmission course, is interfered, then interference signal (± Δ V) be added to (Vi*A) on the vision signal that has been exaggerated.After above-mentioned signal (Vi*A ± Δ V) was transferred to signal receiving end by coaxial cable, by bleeder circuit 20, described bleeder circuit 20 was that the vision signal after being exaggerated is contracted to original level (Vi*A ± Δ V)/A=Vi ± Δ V/A; , as seen, be superimposed upon the interference signal on the vision signal, slackened A doubly (Δ V/A) equally.
Utilize the inherent characteristic of amplifier itself to cooperate peripheral circuit, the out-of-band high-frequency signal of having decayed automatically simultaneously.For example, add interference signal at 50mv, if vision signal is exaggerated 20 times, then interference signal is slackened 100mv/20=5mV, thereby can not cause tangible influence to vision signal.General interference signal＜30mv, human eye just can not felt the picture quality variation.
See also Fig. 2, be another embodiment of suppressor of the present utility model, described suppressor comprises anti-high voltage protective device 11 and the triode amplifier 13 that is arranged on the vision signal transmitting terminal, and power supply circuits 15.Vision signal was at first passed through anti-high voltage protective device 21 before passing through the coaxial cable remote transmission, and then amplified by triode amplifier 13, if having interference signal this moment, the vision signal of the interference signal that superposeed can be amplified in the lump.The bleeder circuit 20 of video reception end can be with the vision signal reduction of the interference signal that superposeed.Power supply circuits 15 comprise the rectification circuit 151 of AC-DC and the reduction voltage circuit 152 of connecting with rectification circuit 151, provide suitable operating voltage by reduction voltage circuit 152 for triode amplifier 13.
The utility model is applicable to that some machine rooms etc. have held in the environment of complex device, and a lot of equipment have used converter technique in these environment, can produce electromagnetic interference.The utility model suppressor can obviously improve video signal transmission quality, and manufacturing process is simple, installs and uses simple, safety, convenient and reliable.
The above only is a better embodiment of the present utility model; protection range of the present utility model does not exceed with above-mentioned execution mode; as long as the equivalence that those of ordinary skills do according to the utility model institute disclosure is modified or changed, all should include in the protection range of putting down in writing in claims.
Claims (5)
1. suppressor is characterized in that: it comprises multiplying arrangement and the bleeder circuit that connects by cable; After vision signal is at first amplified by multiplying arrangement, be transferred to bleeder circuit after interference signal and the vision signal stack that is exaggerated, by the vision signal intensity after the bleeder circuit dividing potential drop with the same by multiplying arrangement vision signal intensity before.
2. suppressor according to claim 1 is characterized in that: described multiplying arrangement is arranged on the vision signal transmitting terminal, and bleeder circuit is arranged on the video reception end.
3. suppressor according to claim 2 is characterized in that: described multiplying arrangement connects power supply circuits, and described power supply circuits comprise rectification circuit and the reduction voltage circuit that is connected in series, and reduction voltage circuit is connected to multiplying arrangement.
4. suppressor according to claim 2 is characterized in that: described suppressor also comprises an anti-high voltage protective device, and it is connected with multiplying arrangement, and vision signal is at first amplified by multiplying arrangement by anti-high voltage protective device again.
5. according to each described suppressor of claim 1-4, it is characterized in that: described multiplying arrangement comprises a plurality of triodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205393593U CN201830380U (en) | 2010-09-21 | 2010-09-21 | Anti-jamming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205393593U CN201830380U (en) | 2010-09-21 | 2010-09-21 | Anti-jamming device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201830380U true CN201830380U (en) | 2011-05-11 |
Family
ID=43968893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205393593U Expired - Fee Related CN201830380U (en) | 2010-09-21 | 2010-09-21 | Anti-jamming device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201830380U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103281478A (en) * | 2013-06-17 | 2013-09-04 | 苏州智聚电子科技有限公司 | Anti-interference equipment suitable for network video player |
| CN103281479A (en) * | 2013-06-17 | 2013-09-04 | 苏州智聚电子科技有限公司 | Anti-interference equipment used for video |
-
2010
- 2010-09-21 CN CN2010205393593U patent/CN201830380U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103281478A (en) * | 2013-06-17 | 2013-09-04 | 苏州智聚电子科技有限公司 | Anti-interference equipment suitable for network video player |
| CN103281479A (en) * | 2013-06-17 | 2013-09-04 | 苏州智聚电子科技有限公司 | Anti-interference equipment used for video |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110511 Termination date: 20120921 |