One time period of a periodic signal ft) is shown in Figure Q1 below.
(a) Derive the complex Fourier Series of f(t).
(b) From the complex Fourier Series of fl(t) obtained from (a), deduce the trigonometrical Fourier Series of
At) and hence sketch its magnitude spectrum up to the 5th harmonic.
(c) fit) is passed through a lowpass filter with cutoff frequency of 200 Hz. Sketch a graph of the received
signal in time domain, clearly labelling the axes.