The practice proves that the performances of GC5016 as a digital up-converter meet the requirements of TD system.

实践证明，GC 5016作为数字上变频器性能满足TD系统的要求。

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But now, Americans may turn more heavily to purchases of low-cost converter boxes that can be attached to existing TVs to pick up digital signals.

但目前来看，美国人可能会主要转向购买低成本的转换盒，用在现有电视上接收数字信号。

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Then, a solution based on Digital Up Converter(DUC) was proposed, which implemented the conversion of a complex digital baseband signal to a real passband signal.

然后采用正交数字上变频（DUC）技术进行基带信号数字域调制和频率变换。

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