Very basic question about fir1 command

I'm all new to Matlab and everything including, i was taking some classes to learn matlab and signal processing and there was this question that my teacher asked during an exam and i still havent figured it out . She basically gave us a signal ;

t=0:1/500:0.3
n=cos(2*pi*10*t) + sin(2*pi*50*t);
    

and asked us to design a FIR filter with 32-order and then plot the signal. There's no other explanation, i'm assuming i should use fir1 command but i'm not sure how. If you guys help me, that'd really help.

Answer 1

[Star Strider]

Probably something like this —

t=0:1/500:0.3;
n=cos(2*pi*10*t) + sin(2*pi*50*t);
Fs = 500;
Fn = Fs/2;
b = fir1(32, 25/Fn);

figure
freqz(b, 1, 2^16, Fs)

n_filt = filtfilt(b, 1, n);

figure
plot(t, n)
hold on
plot(t, n_filt)
hold off
grid
legend('Original Signal','Filtered Signal', 'Location','best')

Experiment with it!

.

[Pelin Kaya]

Thanks, i'll!

[Star Strider]

My pleasure!

If my Answer helped you solve your problem, please Accept it!

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