机顶盒(STB,Set Top Box)的概念是比较广泛的。从广义上说,凡是与电视机连接的网络终端设备都可称为机顶盒,从基于有线电视网络的模拟频道增补器、模拟频道解扰器,到将电话线与电视机联系在一起的“上网机顶盒”、数字卫星的综合接收解码器(IRD,Integrated Receive Decoder)、 The concept of Set Top Box (STB) is relatively broad. Broadly speaking, any network terminal equipment connected to a television set can be referred to as a set-top box, from an analog channel adder based on a cable network, an analog channel descrambler, to an “Internet connection Set-top box ”, digital satellite Integrated Receive Decoder (IRD)