Set top box (STB) originated in the early 1990s, when it was mainly a descrambler designed by cable TV stations in Europe and America to solve the problem of cable TV viewing fees. As an auxiliary device of digital television (DTV), set-top boxes began to pilot digital television and high-definition digital television (HDTV) in European and American countries in the late 1990s. Its main function is to enable users to watch digital TV programs and high-definition digital TV programs with the original analog TV, that is, to provide a digital/analog signal conversion function. Usually, this kind of set-top box is called a digital TV set-top box. Digital TV set-top box has network environment characteristics and conditional access function. The so-called network environment feature refers to that the set-top boxes used in different TV broadcasting networks are different. According to the ETSI definition, three digital TV transmission systems can be: digital TV set-top box DVB-C for receiving cable TV, digital TV set-top box DVB-S for receiving digital satellite TV, and digital TV set-top box DVB-T for receiving terrestrial broadcast TV.

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