what do you obtain when you do the f

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Babacar Dieng 2021-10-11

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https://ww2.mathworks.cn/matlabcentral/answers/1561161-what-do-you-obtain-when-you-do-the-f

编辑： Babacar Dieng 2021-10-14

采纳的回答： Star Strider

y(t) = rect(t/pi)*cos(25t)

what do you obtain ? How do you plot it not with Matlab ?

what is FT Y(w)

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Babacar Dieng 2021-10-11

the rectangular box function whose FT is the sinC function.

Babacar Dieng 2021-10-14

编辑：Babacar Dieng 2021-10-14

to do this by hand. you consider the fact that the product is null every where the rect box is null, that is outside of width of box = [-pi/2, pi/2]. Then inside the rect box width, the max value of the the product is 5.

Plot the cosine(25t) inside the box and you get the result. ( freq = 25/2pi, period=1/freq=0.2513, number of period inside the box n= pi/(0.2512) =12.5).

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