1、限幅滤波

/*A值可根据实际情况调整

value为有效值，new_value为当前采样值

滤波程序返回有效的实际值*/

#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

/*N值可根据实际情况调整

排序采用冒泡法*/

#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;count

sum = 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>value_buf[i+1] )

{

temp = value_buf;

value_buf = value_buf[i+1];

value_buf[i+1] = temp;

}

}

}

for(count=1;count

sum += value[count];

return (char)(sum/(N-2));

}6、限幅平均滤波法

/*

*/

略 参考子程序1、37、一阶滞后滤波法

/* 为加快程序处理速度假定基数为100，a=0~100 */

#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

/* coe数组为加权系数表，存在程序存储区。*/

#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,count

sum += 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;

}