What is the principle of RenhotecIC digital TV set-top box

 

The set-top box is a network terminal device connected to the TV, so that the TV can also access the Internet, and it is clearer and more TV programs can be watched. Set-top boxes include analog set-top boxes, digital set-top boxes, cable TV set-top boxes, etc. Here we will talk about the principle of high-definition cable digital TV set-top boxes.

 

A set-top box is a device that connects a TV with an external signal source. It can convert the compressed digital signal into TV content and display it on the TV. The signal can come from cable, satellite antenna, broadband network and terrestrial broadcasting, etc., except In addition to the images and sounds that can be provided, it can also accept data content, including TV program guides, web pages, subtitles, etc. In this way, users can not only watch digital TV programs, but also conduct interactive digital entertainment, education and commercial activities through the network.

 

The principle of the high-definition cable digital TV set-top box is that the cable company produces various programs into transport streams (TS), turns the code stream of the programs into TS streams, transmits them to the TV after scrambling, and descrambles them to the set-top box. TS contains a lot of programs. If you want to watch that program, you just need to use the demodulator in the set-top box to find out the program you are watching from TS. Different channels have different PID codes, and give it to the decoding chip to decode the audio and The video stream is finally played on the TV through the two cables connected to the TV.

 

The high-definition cable digital TV set-top box is not only the terminal of the user, but also the terminal of the network. It is not just a TV Internet access, digital set-top box is a comprehensive information network. With the development of digital technology, multimedia technology, and network technology, the development of high-definition cable TV digital set-top boxes will be better and better, and the cost will be lower and lower. In this way, most users can enjoy various services such as entertainment and Internet access on ordinary TV sets.