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The closed line of the TV is generally sold in the hardware store

Update:07 Jul 2018
Summary:

The closed line of the TV is generally sold in the hard […]

The closed line of the TV is generally sold in the hardware store. If you go directly to the store, you will find it.
1. The closed TV route is also called the cable TV line. First of all, closed-circuit television refers to a video surveillance system used by a unit or a certain area for monitoring. The broadband radio frequency signal (55MHz----1000MHz) is transmitted in the cable television network, and the transmission, amplification and distribution of the signal is a complicated process, and the technical content is quite high.
2. Instantly transmit the visual image of the activity by means of electricity. Similar to the movie, the television uses the visual residual effect of the human eye to visualize a still image of a frame of gradation, forming a visual moving image. The transmitting end of the television system converts the fine parts of the scene into electrical signals according to the brightness and chromaticity, and then sequentially transmits them. At the receiving end, the brightness Ethernet Switch Suppliers and chromaticity of each fine portion are visualized according to the corresponding geometric position to reproduce the entire original image.
The difference between a set-top box and a closed-circuit television is as follows:
1, the correct statement of closed circuit is cable TV, and the set-top box is an upgrade product of cable TV, that is, the receiving device of digital television;
2, digital TV is better than cable TV, that is, digital signals are more clear than closed-circuit television.

Install a set-top box or closed-circuit charging method:
Prices vary from region to region. However, no matter what you use, the final closed-circuit TV will be eliminated, and you need to install a set-top box;

Use of set-top boxes:
Whether it's a traditional TV, a wall-mounted slim TV, or a smart TV, any TV can be used.