initial commit

Assignment4_211/assignment4.4.m

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+clear; close all; clc;
+
+N = 128;
+n = 0:N-1;
+w1 = 2*pi*0.1;
+w2 = 2*pi*0.15;
+x = cos(w1*n) + cos(w2*n);
+
+% a)
+
+X = fft(x);
+magX = abs(X);
+
+figure;
+stem(n, magX, 'filled');
+xlabel('n');
+ylabel('|X[n]|');
+title('Magnitude Spectrum of x[n]');
+grid on;
+
+% b)
+
+y = hamming(N)' .* x;
+
+Y = fft(y);
+magY = abs(Y);
+
+figure;
+stem(n, magY, 'filled');
+xlabel('n');
+ylabel('|Y[n]|');
+title('Magnitude Spectrum of y[n]');
+grid on;