单片机10种软件滤波程序-九游会j9

假定从8位ad中读取数据（如果是更高位的ad可定义数据类型为int),子程序为get_ad();

1、限副滤波

#define a 10

char value;

char filter()
{
charnew_value;
new_value = get_ad();
if ( ( new_value - value> a ) || ( value - new_value> a )
return value;
return new_value;

}

2、中位值滤波法

#define n11

char filter()
{
char value_buf[n];
char count,i,j,temp;
for ( count=0;count{
value_buf[count] = get_ad();
delay();
}
for (j=0;j{
for (i=0;i{
if ( value_buf>value_buf[i 1] )
{
temp = value_buf;
value_buf = value_buf[i 1];
value_buf[i 1] = temp;
}
}
}
return value_buf[(n-1)/2];
}

3、算术平均滤波法

#define n 12

char filter()
{
intsum = 0;
for ( count=0;count{
sum = get_ad();
delay();
}
return (char)(sum/n);
}

4、递推平均滤波法（又称滑动平均滤波法）

#define n 12

char value_buf[n];
char i=0;

char filter()
{
char count;
intsum=0;
value_buf[i ] = get_ad();
if ( i == n )i = 0;
for ( count=0;countsum = value_buf[count];
return (char)(sum/n);
}

5、中位值平均滤波法（又称防脉冲干扰平均滤波法）

#define n 12

char filter()
{
char count,i,j;
char value_buf[n];
intsum=0;
for(count=0;count{
value_buf[count] = get_ad();
delay();
}
for (j=0;j{
for (i=0;i{
if ( value_buf[i]>value_buf[i 1] )
{
temp = value_buf[i];
value_buf[i] = value_buf[i 1];
value_buf[i 1] = temp;
}
}
}
for(count=1;countsum = value[count];
return (char)(sum/(n-2));
}

6、限幅平均滤波法

略参考子程序1、3

7、一阶滞后滤波法

#define a 50

char value;

char filter()
{
charnew_value;
new_value = get_ad();
return (100-a)*value a*new_value;
}

8、加权递推平均滤波法

#define n 12

char code coe[n] = {1,2,3,4,5,6,7,8,9,10,11,12};
char code sum_coe = 1 2 3 4 5 6 7 8 9 10 11 12;

char filter()
{
char count;
char value_buf[n];
intsum=0;
for (count=0,count{
value_buf[count] = get_ad();
delay();
}
for (count=0,countsum = value_buf[count]*coe[count];
return (char)(sum/sum_coe);
}

9、消抖滤波法

#define n 12

char filter()
{
char count=0;
char new_value;
new_value = get_ad();
while (value !=new_value);
{
count ;
if (count>=n)return new_value;
delay();
new_value = get_ad();
}
return value;
}

10、限幅消抖滤波法

略参考子程序1、9

11、iir滤波例子

intbandpassfilter4(int inputad4)
{
intreturnvalue;
intii;
reslo=0;
reshi=0;
macs=*pdelin;
op2=1068; //filtercoeff4[4];
macs=*(pdelin 1);
op2=8;//filtercoeff4[3];
macs=*(pdelin 2);
op2=-2001;//filtercoeff4[2];
macs=*(pdelin 3);
op2=8;//filtercoeff4[1];
macs=inputad4;
op2=1068; //filtercoeff4[0];
macs=*pdelou;
op2=-7190;//filtercoeff4[8];
macs=*(pdelou 1);
op2=-1973; //filtercoeff4[7];
macs=*(pdelou 2);
op2=-19578;//filtercoeff4[6];
macs=*(pdelou 3);
op2=-3047; //filtercoeff4[5];
*p=reslo;
*(p 1)=reshi;
mytestmul<<=2;
returnvalue=*(p 1);
for(ii=0;ii<3;ii )
{
delayinput[ii]=delayinput[ii 1];
delayoutput[ii]=delayoutput[ii 1];
}
delayinput[3]=inputad4;
delayoutput[3]=returnvalue;

return returnvalue;
}

『本文转载自网络,九游会j9的版权归原作者所有,如有侵权请联系删除』