Using the DFT: Difference between revisions
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[[Image:Signals-13.jpg]] |
[[Image:Signals-13.jpg]] |
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Script for matlab: |
Script for matlab: |
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<pre> |
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clear all; |
clear all; |
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t=0:.01: |
t=0:.01:2; |
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T= |
T=1/3; |
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ts=0:T: |
ts=0:T:2; |
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f1=2; |
f1=2; |
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f2=1/0.125; |
f2=1/0.125; |
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x = sin(2*pi* |
x = sin(2*pi*ts); %this is the function |
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plot(t, |
plot(ts,sin(2*pi*ts),'r-',t,sin(2*pi*t)); % plot the original signal and the signal sampled at 3Hz |
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X = fft(x); % take the DFT |
X = fft(x); % take the DFT |
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pause (2); |
pause (2); |
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plot ( |
plot (ts,X); %plot the DFT of the signal sampled at 3Hz |
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pause (4); |
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</pre> |
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x=sin(2*pi*t); |
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plot(t,x); |
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pause(2); |
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X = fft(x); |
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plot(t,X); %plot the DFT of the original signal |
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Revision as of 11:09, 27 November 2007
sampling and taking the DFT we get this graph:
Script for matlab:
clear all; t=0:.01:2; T=1/3; ts=0:T:2; f1=2; f2=1/0.125; x = sin(2*pi*ts); %this is the function plot(ts,sin(2*pi*ts),'r-',t,sin(2*pi*t)); % plot the original signal and the signal sampled at 3Hz X = fft(x); % take the DFT pause (2); plot (ts,X); %plot the DFT of the signal sampled at 3Hz pause (4); x=sin(2*pi*t); plot(t,x); pause(2); X = fft(x); plot(t,X); %plot the DFT of the original signal