Example 4.3 The message signals shown in Fig 1, are to be multiplexed using FDM with subcarrier frequencies of values f1=10kHz,f2=12kHz,f3= 14kHz. a- Draw a block diagram of the multiplexer marking the output signal as Y(f) b- Sketch frequency spectrum of the output signal Y(f ) and find its baseband bandwidth. c- If the signal Y(f) is to be mixed with a carrier signal c(t)=2cos (2100 103t), sketch the one sided frequency spectrum of the passband signal S(f) and find its bandwidth..