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memes no 3

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This commit is contained in:
Diogo Cordeiro 2020-11-26 16:04:48 +00:00
parent bf694db39f
commit ac25025add
1 changed files with 21 additions and 7 deletions
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28
TP3a/DiogoEliseu_TP3_3.m
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@ -6,18 +6,32 @@ sintetico_data = fopen('sintetico.csv');
sintetico = textscan(sintetico_data, '%f', 'Delimiter', ','); sintetico = textscan(sintetico_data, '%f', 'Delimiter', ',');
sintetico = sintetico{1,1}; sintetico = sintetico{1,1};
fclose(sintetico_data); fclose(sintetico_data);
N = length(sintetico);
FS = 8;
f = (0:N-1)/N*FS;
figure(1) figure(1)
subplot(2,1,1) subplot(2,2,1)
plot(sintetico); plot(f, sintetico);
title('sinal sintetico'); title('sinal sintetico');
subplot(2,1,2) subplot(2,2,2)
DFT_Xa = fft(sintetico, N+1); DFT_Xa = fft(sintetico, N);
DFT_Xa = DFT_Xa(1 : (N+1)/2); plot(f, abs(DFT_Xa))
plot(X((N+1)/2, 0, 1),abs(DFT_Xa)) xlabel('\omega/\pi'), ylabel('|X(\omega)|'), title('DFT sintetico em [0, 2\pi]')
xlabel('\omega/\pi'), ylabel('|X(\omega)|'), title('DFT sintetico em [0, \pi]')
subplot(2,2,3)
low_pass_filter = ones(N,1);
low_pass_filter(81:177) = 0; % 2.5 H 5.5
DFT_Xa_filtered = DFT_Xa.*low_pass_filter;
plot(f, abs(DFT_Xa_filtered))
xlabel('\omega/\pi'), ylabel('|X(\omega)|'), title('DFT sintetico em [0, 2\pi] filtrada')
subplot(2,2,4)
plot(f, abs(ifft(DFT_Xa_filtered)));
title('sinal sintetico filtrado');
function f = X(N, inicio, fim) function f = X(N, inicio, fim)