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DSP using MATLAB 示例Example3.8
代码:
x = rand(1,11); n = 0:10; k = 0:500; w = (pi/500)*k; % [0,pi] axis divided into 501 points. X = x * (exp(-j*pi/500)) .^ (n‘*k); % DTFT of x % signal shifted by two samples y = x; m = n + 2; Y = y * (exp(-j*pi/500)) .^ (m‘*k); % DTFT of y = x(n-2) magX = abs(X); angX = angle(X); realX = real(X); imagX = imag(X); magY = abs(Y); angY = angle(Y); realY = real(Y); imagY = imag(Y); %verification Y_check = (exp(-j*2) .^ w) .* X; % multiplication by exp(-j2w) error = max(abs(Y-Y_check)); % Difference figure(‘NumberTitle‘, ‘off‘, ‘Name‘, ‘x & y sequence‘) set(gcf,‘Color‘,‘white‘); subplot(2,1,1); stem(n,x); title(‘x sequence‘); xlabel(‘n‘); ylabel(‘x(n)‘); grid on; subplot(2,1,2); stem(m,y); title(‘y sequence‘); xlabel(‘n‘); ylabel(‘y(n)‘); grid on; %% -------------------------------------------------------------- %% START X‘s mag ang real imag %% -------------------------------------------------------------- figure(‘NumberTitle‘, ‘off‘, ‘Name‘, ‘X its Magnitude and Angle, Real and Imaginary Part‘); set(gcf,‘Color‘,‘white‘); subplot(2,2,1); plot(w/pi,magX); grid on; % axis([-2,2,0,15]); title(‘Magnitude Part‘); xlabel(‘frequency in \pi units‘); ylabel(‘Magnitude |X|‘); subplot(2,2,3); plot(w/pi, angX/pi); grid on; % axis([-2,2,-1,1]); title(‘Angle Part‘); xlabel(‘frequency in \pi units‘); ylabel(‘Radians/\pi‘); subplot(‘2,2,2‘); plot(w/pi, realX); grid on; title(‘Real Part‘); xlabel(‘frequency in \pi units‘); ylabel(‘Real‘); subplot(‘2,2,4‘); plot(w/pi, imagX); grid on; title(‘Imaginary Part‘); xlabel(‘frequency in \pi units‘); ylabel(‘Imaginary‘); %% -------------------------------------------------------------- %% END X‘s mag ang real imag %% -------------------------------------------------------------- %% -------------------------------------------------------------- %% START Y‘s mag ang real imag %% -------------------------------------------------------------- figure(‘NumberTitle‘, ‘off‘, ‘Name‘, ‘Y its Magnitude and Angle, Real and Imaginary Part‘); set(gcf,‘Color‘,‘white‘); subplot(2,2,1); plot(w/pi,magY); grid on; % axis([-2,2,0,15]); title(‘Magnitude Part‘); xlabel(‘frequency in \pi units‘); ylabel(‘Magnitude |Y|‘); subplot(2,2,3); plot(w/pi, angY/pi); grid on; % axis([-2,2,-1,1]); title(‘Angle Part‘); xlabel(‘frequency in \pi units‘); ylabel(‘Radians/\pi‘); subplot(‘2,2,2‘); plot(w/pi, realY); grid on; title(‘Real Part‘); xlabel(‘frequency in \pi units‘); ylabel(‘Real‘); subplot(‘2,2,4‘); plot(w/pi, imagY); grid on; title(‘Imaginary Part‘); xlabel(‘frequency in \pi units‘); ylabel(‘Imaginary‘); %% -------------------------------------------------------------- %% END Y‘s mag ang real imag %% --------------------------------------------------------------
运行结果:
DSP using MATLAB 示例Example3.8
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