数字下变频器 DDC ; Digital down converter ; Digital Down Conversion ; QPDC
数字上变频器 DUC ; digital up converter ; digital downconverter ; Digital UpperConverter
正交数字上变频器 QDUC ; Quadrature Digital Upconverter
数字上变频器芯片 Digital UpConverter
正交数字下变频器 Digital Down Conversion ; DDC
和数字上变频器芯片 Digital UpConverter ; DUC ; DiigtalUpConvetrer
宽带数字下变频器 WDDC
数字式PWM变频器 digitized PWM inverter
阐述了数字下变频器 Digital Down Conversion ; DDC
介绍了软件无线电的基本思想及结构，提出了一种基于可编程数字下变频器HSP50214B的中频软件无线电接收系统的设计方案。
The basic concept and architecture of software radio is introduced in this paper. And a type of software radio receiver based on programmable digital down converter (DDC) -hsp50214b is presented.
模块的硬件设计主要包括：A／D转换器、数字下变频器（DDC）以及DSP，详尽讨论了A／D 器件AD6640和DDC 器件AD6624的设计和应用；
The design of hardware module includes A/D converter, DDC (Digital Down Converter) and DSP. The design and application of AD6640 and AD6624 are fully discussed in this part.
变频器的控制电路采用数字技术，容易升级、适用范围广。
Its control circuit adopts digit technology, so it is easily promoted, its applicable bound is wide.
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