Question 4 19 marks) Consider an analogue signal composed of two sinusoidal waves with frequencies 500Hz and 1000Hz. (a) What is the minimum sampling frequency that should be used to sample the signal? Explain. [3 marks ] (b) If a 16-point DFT is used to perform frequency analysis on the signal, (0) What is the frequency resolution if a sampling rate of 16kHz is used? Would this frequency resolution be adequate for distinguishing the 500Hz and 1000Hz components in the frequency domain? Explain. (ii) Is there DFT leakage if a sampling rate of 16kHz is used? Explain. [6 marks ]