A$.$ Let a message with sine wave $x(t)$ be the input to $DM,$ where $x(t)$ is given by

$x(t)=20si{n}^2(2{10}^{3}t)+10sin(2{10}^{3}t)+2sin(2{10}^{3}t)$

Determine the minimum value of step size that will prevent slope overload, if the message is sampled by the value of duobled Nyquist rate.

B$.$ Draw the Frequency division multiplexing and frequency division DE multiplexing for $14$ single side signal with each frequency $3KHz,$ and carrier frequency $200KHZ,$ then determine the time constant for the receiver if we used to envelop detector and DE multiplexer.

An FM rignal with motulation index $=7$ is transmitted through an ideal band$-$pass fileer with midband frequency $f_2$ and band widh $f_s,$ where $f_e$ is the carrier frequency and

C$.f_s$ is the frequency of the sinusoidal modulating wave. Determine the magninude spectrum of the filter output.