(Solved): a) Draw two sine waves on the SAME time-domain plot. The characteristics are as follows. Signal \( ...

a) Draw two sine waves on the SAME time-domain plot. The characteristics are as follows. Signal \( A \) (use red ink): amplitude 4 , frequency 6 , phase 0 Signal B (use other ink: amplitude 5 , frequency 4 , phase 90 (3 Marks) b) We send a voice signal from a microphone to a recorder. Is this baseband or broadband transmission? Give your reason. (2 Marks) c) Given the period of \( 220 \mathrm{~ns} \), calculate the corresponding frequencies. (2 Marks) d) A nonperiodic composite signal contains frequencies from 30 to \( 200 \mathrm{kHz} \). The peak amplitude is \( 10 \mathrm{~V} \) for the lowest and the highest signals, and \( 30 \mathrm{~V} \) for the \( 50 \mathrm{kHz} \) signal. Assuming that the amplitudes change gradually from the minimum to the maximum. i. Calculate the bandwidth. (1 Mark) ii. Draw the spectrum. (2 Marks)