视频信号传输距离以及干扰（Video signal transmission distance and interference）.docVIP

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视频信号传输距离以及干扰（Video signal transmission distance and interference）.doc

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视频信号传输距离以及干扰（Video signal transmission distance and interference）

视频信号传输距离以及干扰（Video signal transmission distance and interference） The monitoring system, the transmission of the video signal is a very important part of the whole system, one thing is very hard to deal with the majority of projects, with the equipment price monitoring project in transparency and engineering business competition intensifies, the signal transmission part of the cost of more and more people pay attention to; at present, the most commonly used in monitoring the transmission medium the system is twisted pair, coaxial cable, optical fiber, transmission distance for different occasions, different, how to ensure the transmission quality, reduce the cost, according to many years of engineering experience, here we make some introduction for reference. First, video surveillance coaxial cable transmission (1) transmitting video baseband signals via coaxial cables; The video signal of video baseband signal is generally speaking, its bandwidth is 0-6MHZ, generally speaking, the higher the frequency, the greater the attenuation, the general design only considers that amplitude of the high frequency signal can meet the requirements of the system, the video signal attenuation in 5.8MHZ as follows: SYV75-396 coding standard video cable attenuation of 30dB/1000 meters, SYV75-596 GB series video cable attenuation, 19dB/1000 meters, SYV75-796 series of GB video cable attenuation 13dB/1000 meters; such as the image quality requirement is very high, no interference, 75-3 cable can transmit 75-5 transmission 100 meters, 160 meters, 230 meters 75-7 transmission; in practice, there are some uncertain factors, such as the choice of the the camera is different, the environment interference, generally speaking, the 75-3 cable can transmit 150 meters, 75-5 can transfer 300 M, 75-7 can transmit 500 meters; for longer distance transmission, can be used in video amplifier (video and other equipment, recovery) amplification and compensation of signal transmission can be 2-3 km; in