程序代码：

程序跑不通，问题是：
Error：argument of  type “float”is incompatible  with parameter of type  “float”
*低通滤波处理信号*/   
/*20点滤波器系数*/   

 float h[27]=   
{ -0.000717157271056,                 
-0.002859115151905,                 
-0.007322125396880,                 
-0.014242951623687,                 
-0.022224922136667,                 
-0.027860512534959,                 
-0.026133393824031,                 
-0.011903955491711,                 

 0.017861106212959,                 

 0.061991725990918,                 

 0.114215389756709,                 

 0.164174174504389,                 

 0.200282581002263,                 

 0.213462981531864,                 

 0.200282581002263,                 

 0.164174174504389,                 

 0.114215389756709,                 

 0.061991725990918,                 

 0.017861106212959,                 
-0.011903955491711,                 
-0.026133393824031,                 
-0.027860512534959,                 
-0.022224922136667,                 
-0.014242951623687,                 
-0.007322125396880,                 
-0.002859115151905,                 
-0.000717157271056};  
void  filter(float h[ ],int xin[],int xout[])   
{   
    unsigned int i,j,n; 
    n=27;
    int length = 200;/*  信号为200点＝2s*50Hz采样*/ 
    static int x1[226]; //200+27-1 static  int x1[length+20];  
    int sum; 
  
    
     for(i=0;i<length;i++) x1[n+i-1]=xin[i];   
     for (i=0;i<length;i++)   
      {   
        sum=0;   
        for(j=0;j<n;j++)
         sum+=h[j]*x1[i-j+n-1];   
         xout[i]=sum;  
           
      }
    for(i=0;i<(n-1);i++) x1[n-i-2]=xin[length-1-i]; 

}