Introduction to digital filtering algorithms for C language source programs (nine kinds)

Assume that the data is read from 8-bit AD (if the higher-order AD can define the data type as int), the subroutine is get_ad();

1, limited secondary filtering

2, the median value filtering method

/* N value can be adjusted according to the actual situation

Sorting using bubbling method*/

#define N 11

Char filter()

{

Char value_buf[N];

Char count,i,j,temp;

For ( count=0;count"N;count++)

{

Value_buf[count] = get_ad();

Delay();

}

For (j=0;j"N-1;j++)

{

For (i=0;i"Nj;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;

}

}

}

Return value_buf[(N-1)/2];

}

3. Arithmetic average filtering method

4, recursive average filtering method (also known as sliding average filtering method)

5, the median average filtering method (also known as anti-pulse interference average filtering method)

/*

*/

#define N 12

Char filter()

{

Char count,i,j;

Char value_buf[N];

Int sum=0;

For (count=0;count"N;count++)

{

Value_buf[count] = get_ad();

Delay();

}

For (j=0;j"N-1;j++)

{

For (i=0;i"Nj;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;count"N-1;count++)

Sum += value[count];

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

}

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