数字上变频，包括DDC,CIC,补偿FIR,FIR。-Digital down conversion VHDL procedures, FIR, CIC filter

这是用VHDL语言写的数字下变频模块，包含整个工程文件，数字下变频是软件无线电中的关键技术，可以直接用Quartus II打开。-this is a module of DDC(Digital Down Converter) with VHDL, it includes the whole project,you can open it with Quartus II directly.