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DSP的IIR数字滤波器实现程序源码
亲测有效的IIR数字滤波器C程序实现，输入与输出有明显的滤波效果，如图
附录（C程序源码）：
#include "DSP2833x_Device.h" // DSP2833x Headerfile Include File
#include "DSP2833x_Examples.h" // DSP2833x Examples Include File
#include
#define IIRNUMBER 2
#define SIGNAL1F 1000
#define SIGNAL2F 4500
#define SAMPLEF 10000
#define PI 3.1415926
float InputWave();
float IIR();
float fBn[IIRNUMBER]={ 0.0,0.7757 };
float fAn[IIRNUMBER]={ 0.1122,0.1122 };
float fXn[IIRNUMBER]={ 0.0 };
float fYn[IIRNUMBER]={ 0.0 };
float fInput,fOutput;
float fSignal1,fSignal2;
float fStepSignal1,fStepSignal2;
float f2PI;
int i;
float fin[256],fout[256];
//输入fIn毛刺正弦波，输出fOut较光滑正弦波,Graph: 256,32-bit floating integer,
int nIn,nOut;
main()
{
nIn=0; nOut=0;
fInput=fOutput=0;
f2PI=2*PI;
fSignal1=0.0;
fSignal2=PI*0.1;
// fStepSignal1=2*PI/30;
// fStepSignal2=2*PI*1.4;
fStepSignal1=2*PI/50;
fStepSignal2=2*PI/2.5;
while ( 1 )
{
fInput=InputWave();
fin[nIn]=fInput;
nIn++; nIn%=256;
fOutput=IIR();
fout[nOut]=fOutput;
nOut++; // break point
if ( nOut>=256 )
{
nOut=0;
}
}
}
float InputWave()
{
for ( i=IIRNUMBER-1;i>0;i-- )
{
fXn=fXn[i-1];
fYn=fYn[i-1];
}
fXn[0]=sin((double)fSignal1)+cos((double)fSignal2)/6.0;
fYn[0]=0.0;
fSignal1+=fStepSignal1;
if ( fSignal1>=f2PI ) fSignal1-=f2PI;
fSignal2+=fStepSignal2;
if ( fSignal2>=f2PI ) fSignal2-=f2PI;
return(fXn[0]);
}
float IIR()
{
float fSum;
fSum=0.0;
for ( i=0;i
{
fSum+=(fXn*fAn);
fSum+=(fYn*fBn);
}
return(fSum);
}
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