基于DSPbuilder搭建的DDC，里面包括CIC滤波器，FIR低通滤波器，HB半带滤波器，NCO等，实现了GC5016芯片的功能-DSPbuilder erected based on DDC, which include the CIC filter, FIR low-pass filter, HB half-band filter, NCO, etc. to achieve the function of the GC5016 chip

matlab 编写的简单数字下变频仿真程序，含NCO模块、混频、低通滤波、抽取。模块大多采用matlab自带函数实现- program for DDC simulink base on Matlab