自适应滤波用c语言编程中的问题

只看该作者 · 2017-6-16 15:27

int FIRLMS(int *nx,float *nh,int nError,int nCoeffNumber)
{
int i,r;
float fWork;

r=0;
for ( i=0;i<nCoeffNumber;i++ )
{
fWork=nx[i]*nError*fU;
nh[i]+=fWork;
r+=(nx[i-i]*nh[i]);
}
r/=128;
return r;
其中nx[i-i]是什么意思为什么这么写

只看该作者 · 2017-6-16 15:44

主程序如下
#include"math.h"

#define PI 3.1415926
#define COEFFNUMBER 16
#define INPUTNUMBER 1024

int FIRLMS(int *nx,float *nh,int nError,int nCoeffNumber);

float h[COEFFNUMBER],fU;
int xx[INPUTNUMBER],rr[INPUTNUMBER],wc[INPUTNUMBER];

main()
{
int i,nLastOutput;

nLastOutput=0;
fU=0.0005;
for ( i=0;i<COEFFNUMBER;i++ ) h[i]=0;
for ( i=0;i<INPUTNUMBER;i++ )
{
xx[i]=256*sin(i*2*PI/34);
rr[i]=wc[i]=0;
}
for ( i=COEFFNUMBER+1;i<INPUTNUMBER;i++ )
{
nLastOutput=FIRLMS(xx+i,h,nLastOutput-xx[i-1],COEFFNUMBER); // break point
rr[i]=nLastOutput;
wc[i]=rr[i]-xx[i];
}
exit(0);
}

int FIRLMS(int *nx,float *nh,int nError,int nCoeffNumber)
{
int i,r;
float fWork;

r=0;
for ( i=0;i<nCoeffNumber;i++ )
{
fWork=nx[i]*nError*fU;
nh[i]+=fWork;
r+=(nx[i-i]*nh[i]);
}
r/=128;
return r;
}