Designing a lowpass filter in matlab

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Stefan
Stefan 2013-12-2
评论： Youssef Khmou 2013-12-18
Hello,
I want to implement the analog LP filter having a cutoff frequency of 2.4Hz and gain of 101 as shown http://img42.imageshack.us/img42/4320/qe74.jpg in the matlab. How to implement this LPfilter having a cutoff frequency and gain in matlab. Can help me out with this.

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Youssef Khmou
Youssef Khmou 2013-12-2
there is a filter design functions , you can start with the simplest function as follows :
% given you sampling frequency, lets say 20
fs=20;
fc=2/10;
b=fir(N,fc);
freqz(b);
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Stefan
Stefan 2013-12-18
Hi Youssef KHMOU,
Can I know what is 'N' here and why you are using fc=2/(fs/2); is it mandatory to use this or can we directly use the required fc in the b=fir1(N,3) if fc=3Hz. How to design FIR lowpass filter having a cutoff frequency of 2.8Hz and with a sample rate of 300Hz .
Youssef Khmou
Youssef Khmou 2013-12-18
N is the number of coefficients in the filter. The build in function fir1 requires the cut off frequency to be 0<fc<1, that is why you compute the new cut frequency as a function of Fs : Fc2=fc/(0.5*Fs).

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