FIR filter

Question

yasser safi 2012-5-7

clarify the fir1 code plzz?? and how to design filter

i designed the cheby fiter but i cant design the fir1 filter

function filtered_sig = cheby_filter(no,c,w,x,R)

w2 = c+(w/2);
w1 = c-(w/2);
W = [w1 w2]; 
[b,a] = cheby1(no,R,W);
filtered_sig = filtfilt(b,a,x');
filtered_sig = filtered_sig';

i need to design it in this way..

Answer 1

Wayne King 2012-5-7

I have no idea what you have declared for w1, w2, and no, but I'll assume those are correct.

   w2 = c+(w/2);
   w1 = c-(w/2);
   W = [w1 w2]; 
   b = fir1(no,W);
   filtered_sig = filtfilt(b,1,x');

yasser safi 2012-5-7

thats for chepy filter

i need function for FIR filter

our project is PCR and i wanf filter the data ( absorbance)