Does the bode function automatically converts the vector points into decibels?
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I already calculated the transfer function (Vout/Vin) and I need to plot it on in a bode plot. Would I have to do the manual calculations to change it to decibels or does the bode function automatically do that?
回答（1 个）
The bode function of Control System Toolbox will plot the frequency response of a transfer function in dB. The function can also return numerical data of the magnitude of the response, and that it returns in absolute units, not dB. So, for example:
% create transfer function
H = tf([1 0.1 7.5],[1 0.12 9 0 0]);
% plot the frequency response - not the magnitude is in dB
bode(H)
% extract the magnitude data
[mag,phase,freqs]= bode(H);
% mag contains the responses at freqs, expressed in absolute units.
% convert to dB
magdb = 20*log10(mag);
See the reference page for more details.
doc bode
1 个评论
Azzi Abdelmalek
2013-10-15
H = tf(100,[1 10]);
[mag,phase,freqs]= bode(H)
figure
subplot(2,1,1),plot(log10(freqs),20*log10(squeeze(mag)))
subplot(2,1,2),plot(log10(freqs),squeeze(phase))
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2013-10-15
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