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2.DVB—S数字直播卫星电视系统数字卫星直播(DTH)在国际上存在两大标准,即欧洲的DVB-S标准和美国的DigiCipher标准。但DVB标准逐渐在全球广泛应用,以致后起的美国DTH公司Dish Network也采用了DVB标准。一个典型的DVB-S标准数字直播卫星电视系统如图2所示。由图示可以将DVB-S数字卫星直播系统归结为以下组成部分:(1)前端系统(Headend)
2.DVB-S digital direct broadcast satellite television system Digital Satellite Broadcasting (DTH) there are two major international standards, namely the European DVB-S standard and the United States DigiCipher standard. However, the DVB standard is gradually widely used in the world, so that the later American DTH company Dish Network also adopted the DVB standard. A typical DVB-S standard digital direct broadcast satellite television system is shown in Figure 2. The DVB-S digital satellite live broadcast system can be summarized as the following components: (1) Headend system (Headend)