文件说明.............................................1
代码文件 ..................................................................................................................................1
QuartusII 工程文件 ..................................................................................................................2
仿真文件 ..................................................................................................................................2
系统框图.............................................3
DDS 正弦信号产生 .............................3
DDS 的原理 ..............................................................................................................................3
DA 转换和滤波.........................................................................................................................6
正弦波形 ..................................................................................................................................6
波形的产生 ......................................................................................................................6
波形的存储 ......................................................................................................................8
FIR 滤波器原理.................................15
FIR 原理以及设计方法 ..........................................................................................................15
FIR 滤波器主要有直接型、级联型、线性相位型：...................................................15
FIR 滤波器的设计方法 ..................................................................................................17
设计框架 ........................................................................................................................19
Matlab 软件导出需要的滤波器系数过程 ....................................................................19
Modelsim 仿真..................................20
打开软件 ................................................................................................................................20
打开工程 ................................................................................................................................21
编译 ........................................................................................................................................21
选择仿真文件 ........................................................................................................................22
开始仿真 ................................................................................................................................25
仿真结果 ................................................................................................................................26
