How to solve the video signal interference problem!

1, first determine the location of interference, first check the camera from the front to see if there is interference, if any, generally through the power into it (you can first use the 12V battery to verify whether the power supply interference), you can use the switching power supply to the camera, also Can be installed AC filter for filtering, generally can be solved;

2. If it is generated through the transmission process, first check the connection of the video cable, whether the shielded network is damaged, etc. In addition, you can consider the choice of anti-jamming device. At present, there are two basic principles of anti-jamming device in the market, one is Video baseband signal modulation to 38MHZ or higher frequency, to avoid the interference frequency, the effect can be, but when the interference frequency is close to 38MHZ, then there is no way; the other is to use the video signal in the front-end amplitude amplification to enlarge The method is then compressed at the terminal, because the amplitude of the interference signal is constant, and the corresponding interference signal is also compressed. This is a broad-spectrum anti-jamming method, but the interference has a certain residual, anti-interference The effect depends on the amplitude of the video signal amplification and the position of the interference signal. The larger the amplitude, the closer the interference is to the front end, and the better the anti-interference effect is.

3. If the effect of the anti-jamming device is not obvious, it may be the interference caused by the terminal (computer room), which requires checking the connection, power supply, grounding, and the device itself.

Coaxial cable is the most widely used video transmission medium and is generally used for transmission of short and medium distance video signals. The electrical characteristics of the coaxial cable make it ideal for transmitting full video signals from the camera to the monitor (CCTV video signals are composed of widely distributed low-frequency and high-frequency signals). Almost any kind of wire can be used to transmit low-frequency signals (20 Hz to several kHz). In practical applications, almost all wires can be used as telephone lines. However, if you want to transmit video signals in the frequency range of 20 Hz to 6 MHz, and you do not want any attenuation, you need to use a coaxial cable.

The use of video baseband transmission in television surveillance systems is the most common transmission method. Baseband transmission refers to a method of directly transmitting full-television signals without any processing such as frequency conversion. The advantage of this transmission method is that the transmission system is simple; within a certain distance range, the distortion is small; the additional noise is low (the system signal-to-noise ratio is high); additional equipment such as a modulator, a demodulator, etc. need not be added. The disadvantage is that the transmission distance cannot be too far; a video coaxial cable can only transmit one TV signal.

Because this transmission method has the advantages of stable operation and simple equipment, it has been widely used in practice. However, the frequency band of the video signal is very wide, and the start frequency is very low. Therefore, when the cable is transmitted in the cable, its amplitude and phase will be greatly different between the low frequency band and the high frequency band. Especially when the phase distortion is too large, it is difficult to compensate with a simple circuit. At the same time, the low-frequency part of the baseband transmission is easily disturbed by low-frequency interference sources such as power, telephone, and broadcasting.

Various products of aluminium alloy colour lock, providing product images and basic parameters with each aluminium alloy colour lock and Padlock; We are a professional Chinese manufacturer of aluminium alloy colour lock, and look forward to your cooperation!

2 (1)2 (2)2222 (1)2222 (2)

Shengping Safety Protection Locks Manufactur, create to set up in 1989, is an enterprise specialized in the manufacture of different kinds of locks. We have obtained quality system authentications as ISO9001-2000 International Quality Control System Attestation,and we have obtained self-operation export and import right etc. According to many years of producing and R&D experience, we produce locks more than 100 kinds of specification with different kinds of raw materials & styles. Moreover, we can do customized work as per clients`designs.

Bearing the sense of [quality gets victory", our products are popular in domestic market; and with the fame of our product`s [good quality and best prices", we have increased our export all over the world. Now our product lines are mainly for export.

We tightly hold the quality control system, follow the contract, and keep faith and valued mutual benefit. We sincerely welcome customers home and abroad and our craft brothers to develop and flourish the locks market.



Aluminium Combination Padlock Luggage Padlock

Aluminium Padlock,Heavy Duty Aluminium Padlock,Digital Combination Lock,Aluminium Bag Padlock

Shengping Safety Protection Locks Manufacturer , https://www.chinajiuzhou.com