Question 1 (a) An analogue signal m() is flat-top sampled by an impulse train s(t) of 7, period and a sampling rate f. followed by a pulse holding device with pulse width r and unity amplitude. A sampling frequency f, of 8 kHz and pulse holding width r of 50 μs are used in the flat-top sampling. MO Figure Q2 (i) Sketch the spectrum M.() of the flat-top sampled signal m.(t) if the spectrum M(f) of m(r) is as shown in Figure Q2. [3 marks] (ii) Based on Nyquist Sampling Theorem, determine whether M.() is distorted by aliasing. Justify your answer. [2 marks] (b) Consider the signal g()=2 cos(2 x 10') applied to a delta modulator (DM) of step size A and a sampling frequency of 4 KHZ is used. (i) Determine the minimum value of A to avoid slope overload distortion. [3 marks] (ii) Explain the fundamental difference between DM and adaptive delta modulation (ADM). [2 marks]