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济南保安服务:视频抗干扰器对红外防水摄像机的好处
作者:admin  10bet体育官方网站:2017-06-14 10:01:27
在红外防水摄像机的开展过程中,视频抗搅扰器对其有不可替代的作用。
In the development of infrared waterproof camera, the video anti-jamming device is irreplaceable.
视频抗搅扰器
Video anti-jamming device
因为红外摄像机的传输方法的长处是传输体系构架简略,可是也会遇到传输间隔不能太远,红外智能球有必要在线缆特性请求的范围内传输,并且一根视频同轴电缆一起只能传送一路电视信号。
Because the transmission method of infrared camera system transmission strength is simple, but also will have a transmission interval not too far infrared intelligent ball necessary cable characteristics request within the scope of transmission, and a video coaxial cable with a road can only transmit TV signals.
因为这种传输方法对红外防水摄像机稳定性高,体系中运用的设备简略,布线便利等长处,因而在现实生活中得到了广泛的运用。可是线缆高带宽和实践低频率的运用,形成信号在电缆中传输时,其振幅及相位在低频段与高频段的不同就会很大,特别是在相位失真太大时,便难以用简略的电路进行抵偿的。以及基带传输低频有些很简单遭到强电、发射塔、基站、电动机、变频器等搅扰源的搅扰。比方红外防水摄像机多见的搅扰源:
Because of the advantages of this transmission method for infrared waterproof cameras, such as high stability, simple equipment and convenient wiring, it has been widely used in real life. But the cable of high bandwidth and low frequency of the use of practice, the formation of signal transmission in the cable, its amplitude and phase will be different at low frequency and high frequency greatly, especially in the phase distortion is too large, it is difficult to use a simple circuit for compensation. And baseband transmission, low frequency, some very simple, by strong electricity, towers, base stations, motors, frequency converters and other disturbing sources of disturbance. For example, infrared water camera is a common source of disturbance:
1、播送搅扰:
1, broadcast disturbance:
电缆在空中架起时,这时电缆本身就相当于一根很长的天线。因为天线效应的结果,电缆中会发生相当大的播送搅扰电压,并在电缆外皮上发生搅扰电流,这一电流通过电缆两头接地址与地构成回路,所以在终端负载上就会发生播送搅扰信号的电压,使搅扰信号混入视频信号中。这种搅扰信号在图画上表现为较密的横纹、竖纹、斜纹等,严峻时甚至会吞没整个视频图象。
When the cable is erected in the air, the cable itself is equivalent to a long antenna. Because the antenna effect occurred, a large voltage will disturb the transmission cable, and the occurrence of interference current in cable sheath, the current through the cable ends and address circuit, so in the terminal load voltage signal broadcast interference occurs, the disturbed signal is mixed with the video signal. This kind of disturbance signal shows dense stripes, vertical lines, twill and so on in the picture, and even the whole video image will be swallowed up when it is severe.
2、高频搅扰:
2, high-frequency interference:
电缆屏蔽层对于频率越低的信号其屏蔽作用越差,因为这种原因而引进的高频搅扰信号有载波电话,电台的信号等。它们在图画上形成水平条纹的搅扰。
The shielding performance of the cable shielding layer is lower for the lower frequency signal. For this reason, the high-frequency disturbance signals introduced include carrier telephone, radio signal and so on. They cause horizontal stripes to disturb in pictures.
3、电源搅扰:
3, power disturbance:
当体系需求始端与末端一起接地时,因为两头接地电位不同及电缆外皮电阻的存在,在两地之间导致50Hz的地电位差,然后发生搅扰信号电压。当搅扰信号被叠加在视频信号上时,使正常图画上呈现很宽的横暗带等。
When the start of the system needs to be ground with the terminal, because of the difference of the ground potential at the two ends and the existence of the cable sheath resistance, the ground potential difference between the two places leads to the disturbance voltage of the 50Hz. When the disturbing signal is superimposed on the video signal, a wide horizontal dark band is made on the normal picture.
4、谐波搅扰:
4 harmonic interference:
谐波搅扰首要表如今大电流或高电压的电力线周围,是电力电缆向附近的辐射信号,其频率为2500Hz和125000Hz,首要搅扰视频信号的低频段。
The harmonic disturbance is mainly shown in the vicinity of large current or high voltage power lines. The power cables are in the vicinity of the radiation signal, whose frequency is 2500Hz and 125000Hz, which mainly disturbs the low frequency segment of the video signal.
5、传输线路搅扰:
5, transmission lines disturb:
视频线缆质量欠好,屏蔽功用差(屏蔽层稀少或非铜介质屏蔽层等),线缆电阻过大,而形成的视频信号严峻衰减等。
Video cable quality is not good, shielding function is poor (shielding rare or non copper dielectric shield, etc.), the cable resistance is too large, and the formation of video signals, such as severe attenuation.
6、不洁净电源搅扰:
6, unclean power disturbance:
比方本电网中有大功率可控硅调频调速设备、可控硅整流设备、可控硅交直流改换设备等,都会对电源发生污染。不洁净电源使摄像机和其它有源设备作业不稳定,进而形成搅扰。
For example, the power grid has a large power thyristor frequency modulation speed equipment, SCR rectifier equipment, thyristor switching equipment, etc., will pollute the power supply. The unclean power causes the camera and other active equipment to work out of order, and then leads to disturbances.
以上几个有些使得现场的视频图画遭到强烈搅扰,咱们用视频抗搅扰器能够极好的处理红外防水摄像机以上多见的搅扰源。具体处理方法如下:
Some of the above make the scene video pictures suffer a great deal of disturbance. We can use video anti-jamming device to deal with the disturbing sources of infrared waterproof camera very much. Specific treatment methods are as follows:
1、移频:采用移频技能将视频信号(0-6MHZ)移频至一个49-300MHZ范围内;视频信号通过抗搅扰器发送端进行远间隔传输,在接纳端将信号还原成正常的视频信号输出。因为提高了频率,所以在远间隔传输的一起有效躲避了多种搅扰信号;
1, frequency shift: the frequency shift skill video signal (0-6MHZ) frequency shift to a range of 49-300MHZ; video signals are transmitted through the anti-jamming device end of long distance transmission, the receiving end to restore the signal into a video signal output normal. Because the frequency is increased, the signals transmitted over long distances can effectively avoid a variety of disturbing signals;
2、编码:视频信号进入抗搅扰器后进行数字编码处理,抵达监控基地设备前再进行解码处理。然后防止搅扰源对视频信号的搅扰和视频信号本身的串扰及衰减;
2, coding: video signal into the anti-jamming device after digital coding processing, arrived at the monitoring base equipment before decoding. The interference of the interference source to the video signal and the crosstalk and attenuation of the video signal are prevented;
3、增强:因为一切的信号传输间隔越远信号衰减越大,因而咱们有必要在发送端对信号载体才能进行加强,以便于它能够传输的更远;
3. Enhancement: because the farther the signal transmission interval is, the greater the attenuation of the signal, so it is necessary for us to strengthen the signal carrier at the transmitter so that it can transmit farther;
4、自习惯:在设备内部富含对信号强度的主动调整和习惯功用,因而设备具有0间隔到其最远间隔的传输主动习惯才能;
4, from the habit: in the equipment rich in signal strength of active adjustment and customary function, so the equipment has 0 intervals to its farthest distance transmission initiative habit ability;
5、免调试:一个好的设备不该该有许多的调试有些,因而咱们的设备在出厂时现已具备了90%的商场习惯性,基本上是连接上就能够运用,无需剩余的调试;
5, free debugging: a good equipment should not have a lot of debugging some, so we have the equipment in the factory has used 90% shopping malls, basically is connect to use debugging without rest;
6、安全性:宽电压(12V—24V)的规划理念,防止刹那间电源电压的突增或突降烧坏设备,用以维护设备以及操作人的安全。
6, safety: wide voltage (12V - 24V) planning concept, to prevent sudden power supply voltage sudden increase or drop, burn out equipment, used to maintain equipment and operator safety.
总结:好好使用他们之间的关系特色,红外摄像机的开展空间应该是无穷的。
Sum up: make good use of their relationship features, infrared camera space should be infinite. 




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