# how to plot a conventional DSB AM signal

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Brigitte Hveding 2019 年 12 月 2 日
Commented: Star Strider 2019 年 12 月 2 日
Q: In MATLAB, make time-domain graphs of a Conventional DSB AM signal u(t) = A_c[1 + am(t)]cos(2×π×f_c×t), with A_c = 1, m(t) = cos(2×π×f_m×t), f_c = 1 kHz, f_m = 50 Hz, for four cases of AM modulations: a = 0, a = 0.3, a = 1, a = 1.3. Your graphs should be over four periods of the message (i.e., 0 < t < 4/fm). Include your code in your solution as well as the four graphs.
Matlab is not taught in this class but the TA thought it would be good practice for those who know it (which is most people but not me) Any help would be appreciated!

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Star Strider 2019 年 12 月 2 日
I am not certain how much help you need for this. For a start, see the documentation for the plot function. I am not certain if you are allowed to use it, however the modulate function could be helpful. It will at lelast make it easier for you to experiment. You likely need to clarify whether you are supposed to create a DSB-TC (transmitted carrier) or DSB-SC (suppressed carrier) signal, if this has not already been explained.
For a general introduction to MATLAB see the documentation section on Getting Started if you are completely new to it.

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Brigitte Hveding 2019 年 12 月 2 日
It has been specified as DSB-SC, sorry forgot to include that! he did not specify about not using the modulate function. Thanks for the links, I'll check them out.
Star Strider 2019 年 12 月 2 日
My pleasure.

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