Help me write a C code for FIR filter design

[rashmi venugopal]

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 designops8-O

 

[oyvdahl]

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?

 

[rashmi venugopal]

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

 

[oyvdahl]

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

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

//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

 

[bmsec]

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 ?

 

[bigdogguru]

Here's a few links to DSP in C tutorials to get you started:

Introduction to FIR Digital Filters

**broken link removed**

Implementation of FIR Filtering in C

FIR Filter Implementation

An FIR Filter Example

Hope these links help.

 

[Luciferus]

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 ?

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.

 

[bmsec]

Thank you very much. I've started coding the algorithm in MATLAB.

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.

 

[rubu]

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.

 

[ckshivaram]

check this
**broken link removed**

 

[rubu]

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..