Question

How to graph fourier transform

My question isn't on how they got the transform, my question is how the graph was calculated, I don't know what sinc means

Note: 1) In the following problem set a notation Pa(t) is used to denote an even pulse (i.e. rectangular) shape function with the duration of a. This means that for example the function x(t) in question number one is 2P2(t-1). It is clear that using the properties of Fourier transform is greatly helpful for finding the answers. 2) For each signal, find the Fourier transform, X(u), and then plot IX( (note, you may want to use MATLAB for the plot in 3.) l. except for #3 x (t) x(t) 2. -2 -4 3. x (t) s)- a (a) sinc/ae 4 ㄚ ixi- 12 2내 LS 3n/

Answer 1

em) dw sinm)

21 . SMni 2. a6 2-6 0

av sin)1 sin(u) 2w X(o )-120)- 12 &IT 44- to

(r) ).4 sin(ản) 12sín@) 2 IT 2TT 4 TT 3IT STT 37 2. 0.

/2 24 -37T 平乏礻 2-