#define A 10
char value;
char filter()
{
char new_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 N 11
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()
{
int sum = 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;
int sum=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];
int sum=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