fig5_14.m

用于DSK5416的程序

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% fig5_14.m - M-file for creating Figure 5-14
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M = 8;                     % M=8
L = 2*M+1;                 % window length
wn = [ones(1,L)];          % rectangular window
omega = -pi:2*pi/200:pi;   % frequency range
Hd = freqz(wn,1,omega);    % frequency response
mag = 20*log10(abs(Hd));   % log scale
M1 = 20;                   % M=20
L1 = 2*M1+1;               % window length
wn1 = [ones(1,L1)];        % rectangular window
omega = -pi:2*pi/200:pi;   % frequency range
Hd1 = freqz(wn1,1,omega);  % frequency response
mag1 = 20*log10(abs(Hd1)); % log scale
subplot(2,1,1), plot(omega,mag), title('Magnitude Response, M=8'),...
    ylabel('Magnitude(dB)'), grid;
axis([-3.15 3.15 -40 40]);
subplot(2,1,2), plot(omega,mag1), title('Magnitude Response, M=20'),...
    xlabel('Frequency'), ylabel('Magnitude(dB)'), grid;
axis([-3.15 3.15 -40 40]);