Digital TV refers to a brand-new TV system that uses or processes and modulates digital TV signals from studio to transmission, transmission and reception. All signals in the system are transmitted by digital stream consisting of 0, 1 digital string, and the transmission rate is 19.39Mb/s, which ensures the high definition of digital TV and overcomes the inherent shortcomings of analog TV. The specific transmission process is to digitally compress and modulate the image and sound signals sent by TV stations to form digital TV signals, which are transmitted by satellite, terrestrial broadcast or cable. Because the whole process is processed by digital technology, the signal loss is small and the receiving effect is good, and there is no snowflake and ghost phenomenon of analog TV.