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Help me write a C code for FIR filter design

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rashmi venugopal

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hai,, i am rashmi,, doing mtech,,
can u plz guide me to write c code for fir filter design ,,,
any 1 plz reply.......
where can i get gudance about c code to fir filter design:eek:ops8-O
 

Do you know how to design fir filters? So that you only need to learn to write the filters in c? Or do you need to learn filter design as well?
 
thanks for the reply sir,, ya i know to design the FIR filter,, but how to write c code to that design,, kindly can u send me u r personal mail id,,, so that i can get inputs from u
 

It is better to discuss here so that others can contribute or learn as well.

If you have a fir filter like this y(n) = 0.5x(n) + 0.5x(n-1)
it can be written in C like this:

Code: 
//Example signal to be filtered
int x[] = {0, 10, 20, 30, 40, 50 ,60};

//Resulting signal
int y[7];

//Counter
int i;

for (i=0; i<7; i++)
{
  if (i>=1)
    y[i] = 0.5*x[i] + 0.5*x[i-1]; 
  else
    y[i] = 0.5*x[i]; 
}

//y[] now consists of the filtered signal
 
is it advisable to write filter programs in C or MATLAB ?
i have 2 implement a filter coefficients optimization algorithm.
is it better to write it in C or MATLAB? Later for giving inputs, wwhich is easier ?
 

bmsec said:
is it advisable to write filter programs in C or MATLAB ?
i have 2 implement a filter coefficients optimization algorithm.
is it better to write it in C or MATLAB? Later for giving inputs, wwhich is easier ?
Click to expand...

It depends, per example, if you have a DSP and you need to know whats going in with your filter, you can use Matlab to see whats happening, and then write the C code for your DSP. In your case, you are implementing an algorithm, i suggest to use Matlab first.
 
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    bmsec

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Thank you very much. I've started coding the algorithm in MATLAB.
Luciferus said:
It depends, per example, if you have a DSP and you need to know whats going in with your filter, you can use Matlab to see whats happening, and then write the C code for your DSP. In your case, you are implementing an algorithm, i suggest to use Matlab first.
Click to expand...
 

hi,,
i am deepthi..doing mtech
can any 1 guide me to write c code for fir filter.i am implementing it in msp430 processor.
 

thank you very much.i got the code. since am a beginner in this processor.i have seen that three pages of code . its written like for actual implementation the code should be split into several files. i am really confused where to split and what all things to be done after getting this code. how will i simulate this. i have heard that an IAR embedded workbench c/c++ compiler is used. if so,how it is used. i need the steps.kindly help me..please..
 

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