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2001年11月,世界上第一个卫星数字广播服务站(XM)在美国建成,开始通过两个位于美国上空的地球同步卫星向全美转播数字音频广播(DAB)节目听众借助数字收音机可以直接收听到
In November 2001, the world’s first satellite digital broadcast service (XM) was built in the United States and began broadcasting its Digital Audio Broadcasting (DAB) programs to two U.S. geostationary satellites over the United States. Listening to digital radios listened to directly by the digital radio To