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DSP 实验FIR滤波器代码

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1.循环.title " fir.asm ".mmregs.def _c_int00fir_coff .usect "fir_coff",48in_buf .usect "in_buf",48.bss in,160.bss out,160input .word 0x7FDE,0x04CF,0xF7FD,0xE2D4,0xE6F3,0x1AE5,0x9A5F,0xED44,0x0D2C,0x42A1.word 0x48C3,0xCEF2,0x2889,0xFD21,0xFD3E,0xC78E,0x988E,0x30AC,0x0FBB,0x3216.word 0x0000,0x058B,0x5BAF,0xDBB1,0xDD85,0xA6EE,0xEFE8,0x347D,0xD778,0x21D4.word 0x0C7C,0x5688,0x2784,0xAC72,0xEE91,0xCC24,0x190E,0xDC23,0xD14A,0x4D7E.word 0x2A9F,0x4D7E,0xD14A,0xDC23,0x190E,0xCC24,0xEE91,0xAC72,0x2783,0x5688.word 0x0C7C,0x21D4,0xD778,0x347D,0xEFE8,0xA6EE,0xDD85,0xDBB1,0x5BAF,0x058C .word 0x0000,0x3216,0x0FBB,0x30AC,0x988F,0xC78E,0xFD3E,0xFD21,0x2889,0xCEF2.word 0x48C3,0x42A1,0x0D2C,0xED44,0x9A5F,0x1AE5,0xE6F4,0xE2D3,0xF7FD,0x04CF.word 0x7FDE,0x04CF,0xF7FD,0xE2D4,0xE6F3,0x1AE5,0x9A5F,0xED44,0x0D2C,0x42A1.word 0x48C3,0xCEF2,0x2889,0xFD21,0xFD3E,0xC78E,0x988E,0x30AB,0x0FBB,0x3216.word 0x0000,0x058B,0x5BAF,0xDBB1,0xDD85,0xA6EF,0xEFE8,0x347D,0xD778,0x21D4.word 0x0C7C,0x5688,0x2784,0xAC72,0xEE91,0xCC24,0x190D,0xDC24,0xD149,0x4D7E.word 0x2A9F,0x4D7E,0xD14A,0xDC23,0x190E,0xCC24,0xEE91,0xAC72,0x2783,0x5688.word 0x0C7C,0x21D4,0xD778,0x347D,0xEFE8,0xA6EE,0xDD86,0xDBB1,0x5BAF,0x058C .word 0x0000,0x3216,0x0FBB,0x30AC,0x988F,0xC78D,0xFD3E,0xFD21,0x2889,0xCEF1.word 0x48C3,0x42A2,0x0D2C,0xED44,0x9A5F,0x1AE5,0xE6F4,0xE2D3,0xF7FD,0x04CF.datafir_table .word -6,28,46,27,-35,-100,-93,26,191,240,52,-291.word -497,-278,337,888,773,-210,-1486,-1895,-442,2870.word 6793,9445,9445,6793,2870,-442,-1895,-1486,-210,773.word 888,337,-278,-497,-291,52,240,191,26,-93.word -100,-35,27,46,28,-6.text_c_int00: SSBx FRCT;小数乘法编程时，设置FRCT(小数方式)位STM #in,AR1RPT #159MVPD input,*AR1+STM #fir_coff,AR1RPT #47MVPD fir_table,*AR1+STM #in_buf,AR1RPT #47ST #0,*AR1+STM #in_buf+47,AR2STM #fir_coff+47,AR3STM #48,BKSTM #-1,AR0STM #out,AR6STM #in,AR5STM #159,AR7MVDD *AR5+,*AR2+0%FIR2: ;FIR滤波运算RPTZ A,#47MAC *AR2+0%,*AR3+0%,A ;STH A,*AR6+MVDD *AR5+,*AR2+0%;用最新的样本值替代最旧的样本值BANZ FIR2,*AR7-NOPNOPend: B end.end2.线性缓冲区法.title " fir.asm ".mmregs.def _c_int00fir_coff .usect "fir_coff",48in_buf .usect "in_buf",48.bss in,160.bss out,160input .word 0x7FDE,0x04CF,0xF7FD,0xE2D4,0xE6F3,0x1AE5,0x9A5F,0xED44,0x0D2C,0x42A1.word 0x48C3,0xCEF2,0x2889,0xFD21,0xFD3E,0xC78E,0x988E,0x30AC,0x0FBB,0x3216.word 0x0000,0x058B,0x5BAF,0xDBB1,0xDD85,0xA6EE,0xEFE8,0x347D,0xD778,0x21D4.word 0x0C7C,0x5688,0x2784,0xAC72,0xEE91,0xCC24,0x190E,0xDC23,0xD14A,0x4D7E.word 0x2A9F,0x4D7E,0xD14A,0xDC23,0x190E,0xCC24,0xEE91,0xAC72,0x2783,0x5688.word 0x0C7C,0x21D4,0xD778,0x347D,0xEFE8,0xA6EE,0xDD85,0xDBB1,0x5BAF,0x058C .word 0x0000,0x3216,0x0FBB,0x30AC,0x988F,0xC78E,0xFD3E,0xFD21,0x2889,0xCEF2.word 0x48C3,0x42A1,0x0D2C,0xED44,0x9A5F,0x1AE5,0xE6F4,0xE2D3,0xF7FD,0x04CF.word 0x7FDE,0x04CF,0xF7FD,0xE2D4,0xE6F3,0x1AE5,0x9A5F,0xED44,0x0D2C,0x42A1.word 0x48C3,0xCEF2,0x2889,0xFD21,0xFD3E,0xC78E,0x988E,0x30AB,0x0FBB,0x3216.word 0x0000,0x058B,0x5BAF,0xDBB1,0xDD85,0xA6EF,0xEFE8,0x347D,0xD778,0x21D4.word 0x0C7C,0x5688,0x2784,0xAC72,0xEE91,0xCC24,0x190D,0xDC24,0xD149,0x4D7E .word 0x2A9F,0x4D7E,0xD14A,0xDC23,0x190E,0xCC24,0xEE91,0xAC72,0x2783,0x5688 .word 0x0C7C,0x21D4,0xD778,0x347D,0xEFE8,0xA6EE,0xDD86,0xDBB1,0x5BAF,0x058C .word 0x0000,0x3216,0x0FBB,0x30AC,0x988F,0xC78D,0xFD3E,0xFD21,0x2889,0xCEF1 .word 0x48C3,0x42A2,0x0D2C,0xED44,0x9A5F,0x1AE5,0xE6F4,0xE2D3,0xF7FD,0x04CF .datafir_table .word -6,28,46,27,-35,-100,-93,26,191,240,52,-291.word -497,-278,337,888,773,-210,-1486,-1895,-442,2870.word 6793,9445,9445,6793,2870,-442,-1895,-1486,-210,773.word 888,337,-278,-497,-291,52,240,191,26,-93.word -100,-35,27,46,28,-6.text_c_int00: SSBx FRCT;小数乘法编程时，设置FRCT(小数方式)位STM #in,AR1RPT #159MVPD input,*AR1+STM #fir_coff,AR1RPT #47MVPD fir_table,*AR1+STM #in_buf,AR1RPT #47ST #0,*AR1+STM #in,AR5STM #in_buf,AR2MVDD *AR5+,*AR2STM #in_buf+47,AR2STM #out,AR6STM #159,AR7FIR2: ;FIR滤波运算RPTZ A,#47MACD *AR2-,fir_table,A ;STH A,*AR6+MAR *AR2+ ;为了调整间接寻址的指?MVDD *AR5+,*AR2 ;用最新的样本值替代最旧的样本值STM #in_buf+47,AR2BANZ FIR2,*AR7-NOPNOPend: B end.end3.系数对称法链接文件MEMORY{PAGE 0: /*定义程序存贮区*/EPROM:org=0090H len=0F70H /*定义EPROM区，起始地址0090H，长度0F70H*/VECS: org=0080H len=0010H /*定义VECS区，起始地址0080H，长度0010H*/PAGE 1: /*定义数据存贮区*/SPRAM:org=1000H len=1000H /*定义SPRAM区，起始地址1000H，长度1000H*/DARAM:org=2000H len=2000H /*定义DARAM区，起始地址2000H，长度2000H*/}SECTIONS{.vector: {} > VECS PAGE 0.text: {} > EPROM PAGE 0.data: {} > DARAM PAGE 1.bss: {} > DARAM PAGE 1fir_coff: align(64) {} > EPROM PAGE 0x_new: align(32) {} > EPROM PAGE 0x_old: align(32) {} > EPROM PAGE 0}主代码：.title " fir.asm ".mmregs.def _c_int00fir_coff .usect "fir_coff",48x_new .usect "x_new",24x_old .usect "x_old",24.bss in,160.bss out,160input .word 0x7FDE,0x04CF,0xF7FD,0xE2D4,0xE6F3,0x1AE5,0x9A5F,0xED44,0x0D2C,0x42A1.word 0x48C3,0xCEF2,0x2889,0xFD21,0xFD3E,0xC78E,0x988E,0x30AC,0x0FBB,0x3216 .word 0x0000,0x058B,0x5BAF,0xDBB1,0xDD85,0xA6EE,0xEFE8,0x347D,0xD778,0x21D4 .word 0x0C7C,0x5688,0x2784,0xAC72,0xEE91,0xCC24,0x190E,0xDC23,0xD14A,0x4D7E .word 0x2A9F,0x4D7E,0xD14A,0xDC23,0x190E,0xCC24,0xEE91,0xAC72,0x2783,0x5688 .word 0x0C7C,0x21D4,0xD778,0x347D,0xEFE8,0xA6EE,0xDD85,0xDBB1,0x5BAF,0x058C .word 0x0000,0x3216,0x0FBB,0x30AC,0x988F,0xC78E,0xFD3E,0xFD21,0x2889,0xCEF2.word 0x48C3,0x42A1,0x0D2C,0xED44,0x9A5F,0x1AE5,0xE6F4,0xE2D3,0xF7FD,0x04CF .word 0x7FDE,0x04CF,0xF7FD,0xE2D4,0xE6F3,0x1AE5,0x9A5F,0xED44,0x0D2C,0x42A1.word 0x48C3,0xCEF2,0x2889,0xFD21,0xFD3E,0xC78E,0x988E,0x30AB,0x0FBB,0x3216 .word 0x0000,0x058B,0x5BAF,0xDBB1,0xDD85,0xA6EF,0xEFE8,0x347D,0xD778,0x21D4 .word 0x0C7C,0x5688,0x2784,0xAC72,0xEE91,0xCC24,0x190D,0xDC24,0xD149,0x4D7E .word 0x2A9F,0x4D7E,0xD14A,0xDC23,0x190E,0xCC24,0xEE91,0xAC72,0x2783,0x5688 .word 0x0C7C,0x21D4,0xD778,0x347D,0xEFE8,0xA6EE,0xDD86,0xDBB1,0x5BAF,0x058C .word 0x0000,0x3216,0x0FBB,0x30AC,0x988F,0xC78D,0xFD3E,0xFD21,0x2889,0xCEF1 .word 0x48C3,0x42A2,0x0D2C,0xED44,0x9A5F,0x1AE5,0xE6F4,0xE2D3,0xF7FD,0x04CF .datafir_table .word -6,28,46,27,-35,-100,-93,26,191,240,52,-291.word -497,-278,337,888,773,-210,-1486,-1895,-442,2870.word 6793,9445,9445,6793,2870,-442,-1895,-1486,-210,773.word 888,337,-278,-497,-291,52,240,191,26,-93.word -100,-35,27,46,28,-6.text_c_int00: SSBx FRCT;小数乘法编程时，设置FRCT(小数方式)位STM #in,AR1RPT #159MVPD input,*AR1+STM #fir_coff,AR1RPT #47MVPD fir_table,*AR1+STM #x_new,AR1RPT #23ST #0,*AR1+STM #x_old,AR1RPT #23ST #0,*AR1+STM #in,AR5STM #x_new,AR2MVDD *AR5+,*AR2STM #x_new,AR2STM #x_old+23,AR3STM #-1,AR0STM #24,BKSTM #out,AR6STM #159,AR7FIR2: ;FIR滤波运算ADD *AR2+0%,*AR3+0%,ARPTZ B,#23FIRS *AR2+0%,*AR3+0%,fir_table ;STH B,*AR6+MAR *+AR2(2)% ;为了调整间接寻址的指?MAR *AR3+%MVDD *AR2,*AR3+0%MVDD *AR5+,*AR2 ;用最新的样本值替代最旧的样本值BANZ FIR2,*AR7-NOPNOPend: B end.end4.高通滤波.title " fir.asm ".mmregs.def _c_int00fir_coff .usect "fir_coff",35in_buf .usect "in_buf",35.bss in,160.bss out,160input .word 0x7FDE,0x04CF,0xF7FD,0xE2D4,0xE6F3,0x1AE5,0x9A5F,0xED44,0x0D2C,0x42A1.word 0x48C3,0xCEF2,0x2889,0xFD21,0xFD3E,0xC78E,0x988E,0x30AC,0x0FBB,0x3216.word 0x0000,0x058B,0x5BAF,0xDBB1,0xDD85,0xA6EE,0xEFE8,0x347D,0xD778,0x21D4.word 0x0C7C,0x5688,0x2784,0xAC72,0xEE91,0xCC24,0x190E,0xDC23,0xD14A,0x4D7E.word 0x2A9F,0x4D7E,0xD14A,0xDC23,0x190E,0xCC24,0xEE91,0xAC72,0x2783,0x5688.word 0x0C7C,0x21D4,0xD778,0x347D,0xEFE8,0xA6EE,0xDD85,0xDBB1,0x5BAF,0x058C .word 0x0000,0x3216,0x0FBB,0x30AC,0x988F,0xC78E,0xFD3E,0xFD21,0x2889,0xCEF2.word 0x48C3,0x42A1,0x0D2C,0xED44,0x9A5F,0x1AE5,0xE6F4,0xE2D3,0xF7FD,0x04CF.word 0x7FDE,0x04CF,0xF7FD,0xE2D4,0xE6F3,0x1AE5,0x9A5F,0xED44,0x0D2C,0x42A1.word 0x48C3,0xCEF2,0x2889,0xFD21,0xFD3E,0xC78E,0x988E,0x30AB,0x0FBB,0x3216.word 0x0000,0x058B,0x5BAF,0xDBB1,0xDD85,0xA6EF,0xEFE8,0x347D,0xD778,0x21D4.word 0x0C7C,0x5688,0x2784,0xAC72,0xEE91,0xCC24,0x190D,0xDC24,0xD149,0x4D7E.word 0x2A9F,0x4D7E,0xD14A,0xDC23,0x190E,0xCC24,0xEE91,0xAC72,0x2783,0x5688.word 0x0C7C,0x21D4,0xD778,0x347D,0xEFE8,0xA6EE,0xDD86,0xDBB1,0x5BAF,0x058C .word 0x0000,0x3216,0x0FBB,0x30AC,0x988F,0xC78D,0xFD3E,0xFD21,0x2889,0xCEF1.word 0x48C3,0x42A2,0x0D2C,0xED44,0x9A5F,0x1AE5,0xE6F4,0xE2D3,0xF7FD,0x04CF.datafir_table .word -170,144,0,-246,193,293,-482,0,727,-554,-682,1373.word 0,-2271,1937,2975,-9764,12963,-9764,2975,1937,-2271.word 0,1373,-682,-554,727,0,-482,293,193,-246.word 0,144,-170.text_c_int00: SSBx FRCT;小数乘法编程时，设置FRCT(小数方式)位STM #in,AR1RPT #159MVPD input,*AR1+STM #fir_coff,AR1RPT #34MVPD fir_table,*AR1+STM #in_buf,AR1RPT #34ST #0,*AR1+STM #in_buf+34,AR2STM #fir_coff+34,AR3STM #35,BKSTM #-1,AR0STM #out,AR6STM #in,AR5STM #159,AR7MVDD *AR5+,*AR2+0%FIR2: ;FIR滤波运算RPTZ A,#34MAC *AR2+0%,*AR3+0%,A ;STH A,*AR6+MVDD *AR5+,*AR2+0%;用最新的样本值替代最旧的样本值BANZ FIR2,*AR7-NOPNOPend: B end.end。

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基于DSP的FIR数字滤波器_(设计实验)(汇编语言)

基于DSP的FIR数字滤波器_(设计实验)(汇编语言)

基于DSP 的FIR 数字滤波器 (设计实验)一、实验目的1.了解FIR （Finite Impulse Response 有限冲激响应）滤波器的原理及使用方法；2.了解使用MATLAT 语言设计FIR 滤波器的方法；3.了解DSP 对FIR 滤波器的设计及编程方法；4.熟悉在CCS 环境下对FIR 滤波器的调试方法； 二、实验原理数字滤波是DSP 的最基本应用，利用MAC （乘、累加）指令和循环寻址可以方便地完成滤波运算。

两种常用的数字滤波器：FIR （有限冲激响应）滤波器和IIR （无限冲激响应）滤波器的DSP 实现。

设FIR 滤波器的系数为h(0)，h(1)， ...，h(N-1)，X(n)表示滤波器在n 时刻的输入，则n 时刻的输出为： FIR 数字滤波器的结构如图3.1所示。

1、线性缓冲区法又称延迟线法。

其方法是：对于n=N 的FIR 滤波器，在数据存储器中开辟一个N 单元的缓冲区，存放最新的N 个样本；滤波时从最老的样本开始，每读一个样本后，将此样本向下移位；读完最后一个样本后，输入最新样本至缓冲区的顶部。

以上过程，可以用N=6的线性缓冲区示意图来说明，如图3-2所示图3-2 N=6的线性缓冲区示意图2、循环缓冲区法图3-3说明了使用循环寻址实现FIR 滤波器的方法。

对于N 级FIR 滤波器，在数据存储区开辟一个称为滑窗的具有N 个单元的缓冲区，滑窗中存放最新的N 个输入样本值。

每次输入新的样本时，新的样本将改写滑窗中最老的数据，其他数据则不需要移动。

10()()()(0)()(1)(1)(1)[(1)]N i y n h i x n i h x n h x n h N x n N -==-=+-+---∑Z -1Z -1Z -1y(n)图3-3 FIR滤波器循环缓冲区存储器图三、实验内容与步骤设计一个FIR低通滤波器，通带边界频率为1500Hz，通带波纹小于1dB；阻带边界频率为2000Hz，阻带衰减大于40dB；采样频率为8000Hz。

FIR滤波器的DSP设计 FFT的DSP实验

FIR滤波器的DSP设计 FFT的DSP实验


1. 代码被修改的部分： #define S2_Freq 160 // 信号 2 频率 void init_fft_tab(void) //输入波形的初始化
{ float wt1; float wt2; inti; for (i=0;i<Sample_Numb;i++) { wt1=2*pi*i*S1_Freq; wt1=wt1/SampleFreq; wt2=2*pi*i*S2_Freq; wt2=wt2/SampleFreq; //此处实现 60Hz 和 160Hz 两个信号相乘。 SignalInput[i]=cos(wt1)*cos(wt2)*100; //SignalInput[i]=(cos(wt1)+cos(wt2))/2*100; } } 由时域相乘频域卷积可以知道 60Hz 和 160Hz 的余弦信号相乘将得到有 100Hz 和 220Hz 频率分量的信号。 2. CCS 仿真图形如下： A、时域信号波形为（图形入口地址：SignalInput） ：
b) 用 SPtool 验证所设计的滤波器的功能 在 FDATool 里设计了一个 FIR 低通滤波器后，可以用 SPTool 来分析所设计的滤波器是否 实现了功能与 FDATool 一样。SPTool 可以对信号进行时域与频域的分析。测试滤波器是否实 现功能的主要步骤： 在 MATLAB 环境下产生一个混叠波信号，在 MATLAB 命令窗口输入： Fs = 20000;
} void main() { int p=0; n=0; wavein(); for(n=0;n<N;n++ ) { p=0; s=0; while((p<order)&&(p<=n)) { s=fir[p]*input[n-p]+s; p++; } output[n]=s; } }
DSP实验报告——FIR和IIR滤波器设计

DSP实验报告——FIR和IIR滤波器设计

DSP 实验报告实验一 FIR 滤波器的设计1.实验目的利用所学DSP 知识，在CCS3.3平台上，对TMS320VC5416DSP 设计，编程实现FIR 滤波器。

从而学会使用CCS 软件和TMS320VC5416实验板。

2.实验要求设计一个10阶的FIR 滤波器，要求 =2.5kHZ ，定点实现。

并对 =8kHZ 的多正弦波合成文件进行滤波测试，显示出输入和输出信号。

3.实验原理一个截止频率为 的理想数字低通滤波器，其传递函数的表达式为：⎪⎩⎪⎨⎧≤≤≤=-πωωωωωτωc c j jd ee H ,0,)(这个滤波器是物理不可实现的。

为了产生有限长度的冲激响应函数，我们取样响应为)(n h ，长度为N 。

)(n h 表示截取)(n h d 后的冲激响应，即)()()(n h n n h d ω=，其中)(n ω即为窗函数，窗长为N 。

一般的FIR 滤波器差分方程如下：1()()()n k y n h k x n k -==-∑进行Z 变换得到FIR 的系统函数为：∑-=-=10)()(N n nz n h z HN 阶滤波器通常采用N 个延迟单元、N 个加法器与N+1个乘法器组成。

因此可以得到FIR 滤波器的结构图如图1所示。

图1 FIR 滤波器直接结构图4.设计思路对于FIR滤波器的设计，其系数()h n是关键。

由于matlab自带滤波器设计工具箱和滤波器设计函数，故借用matlab工具，设计满足条件的滤波器并导出系数以备编写滤波器程序时使用。

实验需要用到的输入数据是多正弦波合成文件，对于输入信号的设计，这里也借助matlab编程生成dat文件。

然后用C语言编写FIR滤波器的主程序，输入文件在程序运行后导入。

5.实验内容（1）滤波器系数的设计由于实验只给出滤波器条件为N=10，=2.5kHZ，并没有给出和，所以这里调用matlab工具箱函数fir1实现窗函数法设计滤波器。

fir1的调用格式为 （ ，），返回值为6dB截止频率为的N阶（单位脉冲响应h（n）长度=N+1）的FIR低通滤波器的系数向量（为标量），默认选用哈明窗。

实验4 FIR数字滤波器的DSP编程实现-推荐下载

实验4 FIR数字滤波器的DSP编程实现-推荐下载


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