Connection and principle introduction of high-definition twisted-pair transmitter

High-definition twisted pair transmitter is a common video signal transmission tool, which has a very good use e

Connection and principle introduction of high-definition twisted-pair transmitter

High-definition twisted pair transmitter is a common video signal transmission tool, which has a very good use experience and strong anti-interference function. High-definition twisted-pair transmitter adopts differential transmission principle and uses signals with opposite polarity to spread. It is very suitable for transmitting video and is an indispensable part of our life now. The following small series will introduce how to connect the high-definition twisted-pair transmitter and what is the principle of the high-definition twisted-pair transmitter.

Connection of high-definition twisted-pair transmitter

1, a network cable transmits a signal:

This method is wasteful, but if it is a pan/tilt, we can use the remaining pair of wires as control signal lines.

2. One network cable transmits four signals: this method is economical and is generally used in situations where fixed cameras are concentrated.

3. One network cable transmits four kinds of signals. First, use a pair of twisted pair (telephone line) to pull each point to A, and then transmit it to the receiving end through the main road.

This method is more flexible, generally used in four scattered points, saving a lot of lines, but we should pay attention to the treatment of joints, such as point A.

4. Concentrate first and then transmit. First, the video signals from all over the country are pulled to a point through the coaxial line, and they are concentrated and transmitted by multi-channel transmitters.

Or install a waterproof case at this point, and install all the single-channel transmitters into the box as the transmitting end. This scheme is not recommended when the front camera is too far away from here, such as 100 meters away. If this scheme is needed, a better coaxial video cable must be selected.

The above methods should be integrated and applied to the optimization of the whole system.

Principle of high definition twisted pair transmitter

The basic principle of using twisted pair to transmit video signals is:

1, the usual video signal is an unbalanced video baseband signal, which is suitable for transmission in coaxial cable. This is an unbalanced transmission mode. Twisted pair is a balanced transmission mode. It is precisely because of balanced transmission and twisted pair cable mode that twisted pair cable transmission has strong anti-interference ability. Therefore, if twisted pair is used to transmit video signals, the video signals must be converted into balanced signals.

2. The video signal converted into balanced mode can be directly transmitted on twisted pair, which is not easily influenced by various interference signals. At the monitoring end, because the input ports of most monitoring devices, such as video recording and display, are unbalanced, it is necessary to convert the balanced signals transmitted by twisted pair into unbalanced signals. That is to say, twisted pair is used instead of video cable to transmit video signals, and only balanced/unbalanced converters (push terminals) need to be added at the front and rear ends of the cable.

3. The simplest converter is essentially a video mutual inductance coil wound in parallel on a high-flux and high-bandwidth magnetic ring, which is usually called a passive converter. It only plays the role of balanced/unbalanced conversion, and is a passive device, which will not bring new distortion and noise, but will attenuate the signal to some extent.

4. Because the signal attenuation, especially the attenuation of high-frequency components, is particularly serious when the video signal is transmitted on twisted pair, the balanced video signal transmitted through twisted pair must generally be amplified by an amplifier circuit, and the signal, especially the high-frequency signal, is boosted and recovered, and then converted into an unbalanced signal for use by post-stage equipment such as monitors. Usually this kind of amplifier is called twisted pair receiver, which plays the role of amplification and compensation. Generally, there are two adjustable potentiometers on it to adjust the amplification gain of the whole amplifier and the compensation of high frequency components according to the actual situation.

What is the principle of high-definition twisted-pair transmitter, and what is the connection of high-definition twisted-pair transmitter? These small series have been introduced in detail. The high-definition twisted-pair transmitter has a distinctive shape, generally consisting of two ends and two connectors. The high-definition twisted pair transmitter can also be regarded as a converter. Interested parties can learn more about the high-definition twisted pair transmitter.

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