Sine wave signal stop time

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John Smith 2015-5-3

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https://ww2.mathworks.cn/matlabcentral/answers/214852-sine-wave-signal-stop-time

评论： John Smith 2015-5-3

采纳的回答： Geoff Hayes

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Hi all,

I am generating a sine wave as shown below:

     Fs = 8000;                 
     dt = 1/Fs;                  
     t = 0: dt: 3;
     Fc = 320;                   % hertz
     x1 = sin(2*pi*Fc*t);
     plot(t,x1);

How can I make the sine wave stop after 2 seconds please?

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Geoff Hayes 2015-5-3

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John - please clarify what you mean by wanting to make the sine wave stop after 2 seconds. Do you only want to show 2 seconds of data, and if so, then just initialize t as

t = 0:dt:2-dt;

John Smith 2015-5-3

Thanks for the reply. I want the graph to show a time period of 3 seconds but the sine wave to start from 0sec and stop at 2 sec. How can I achieve this please?

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Answer 1

Geoff Hayes 2015-5-3

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John - just do as before but specify t as

t = 0: dt: 2-dt;

Once you have called

plot(t,x1);

you will see data from 0 to 2 seconds. To extend this to 3 seconds, just change the x-axis limits using

xlim([0 3])

You will now have a time period from 0 to 3 seconds, but data for just 0 to 2.

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John Smith 2015-5-3

Thanks for the reply.

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Answer 2

KL 2015-5-3

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     Fs = 8000;                 
     dt = 1/Fs;                  
     t1 = 0: dt: 2;
     t2 = 0*(2: dt : 3);
     t = [t1 t2];
     Fc = 320;                   % hertz
     x1 = sin(2*pi*Fc*t);
     plot(t,x1);