FFT for ideal filters
2 ビュー (過去 30 日間)
古いコメントを表示
Hello everyone,
i have to plot impulse responses for some ideal filters (see the picture)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/165733/image.jpeg)
(lowpass highpass bandpass bandstop)
i was able to plot the lowpass one using this code :
if true
t=-5:.01:5;
x=rectpuls(t,2*0.2);
figure(1)
plot(t,x)
grid
Ts = mean(diff(t));
Fs = 1/Ts;
L = length(x);
ftx = fft(x)/L;
ftxs = fftshift(ftx);
Fv = linspace(-Fn, Fn, L);
figure(2)
plot(Fv, abs(ftxs))
grid
end
Now i want to do the rest, how can i do it ? thanks you !
0 件のコメント
回答 (1 件)
Weird Rando
2016 年 6 月 5 日
You do realise that the diagram you uploaded is the impulse responses for the ideal filters.
All you need to do is create an array with 1's and 0's at certain points of a and b.
freq = -.5:0.01:.5;
%high pass
b = 0.2;
hp = ones(1,length(freq));
hp(abs(freq)<0.2) = 0;
plot(freq,hp);
%axis([-0.6 0.6 -1 2]);
xlabel('Frequency')
ylabel('Magnitude')
0 件のコメント
参考
カテゴリ
Help Center および File Exchange で Digital Filter Analysis についてさらに検索
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!