数字下变频技术的基本功能是将宽带高速数据流信号转变成窄带低速数据流信号，以便DS P实时处理。
The basic function of digital down-conversion technology is to transfer wideband high speed data signals into narrowband low speed data signals, so that DSP can process them in real time.
与其他国家大多的做法不同，电视信号通过地面和卫星传送，比直接向个人的手机上发送数据流的方法效率高得多。
The signals are delivered via terrestrial and satellite broadcasts, a far more efficient approach than sending individual data streams to each viewer's handset, as is mostly done in other countries.
在UML中，活动被用来对不同种类的流程建模：信号流或数据流，也有算法流或过程流。
Activities in UML are used to model flows of various kinds: signal or data flows, as well as algorithmic or procedural flows.
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