Chapter 3
Study notes

 3.1 Finding the spectrum of a sampled signal using a pulse train
 3.2 How to check system is linear?
 3.3 How to check if system is time invariant?
 3.4 How to know if a sampled sequence is periodic?
 3.5 How to find DTFT of a unit step function which runs over some window?
 3.6 How to write a window of deltas using unit step function?
 3.7 How to find the CTFT Fourier transform of a periodic signal?
 3.8 Review of the sampling theory
 3.9 How to find the DTFT from the CTFT given sampling period?
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