Hints to Problem Set 1 1 (a) Note that the signal is periodic. It is better to work out the spectrum of just 1 pulse and then use the results from tutorial and laboratory experiment S1. Note also that convolving two rectangular pulses gives a triangular one. (b) Do it graphically. The second waveform is also equal to the difference of two rectangular pulses. 2 (a) Use the definition of energy density spectrum. (b) Follow what has been done under frequency response. 3 (a) Sketch the spectrum of the input first. See how spectra before and after
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