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Modulation and Demodulation-4 Starter Quiz
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Question 1
A signal m(t) is shown
This signal is applied to both phase modulator (with kp as phase constant) and frequency modulator (with Kf as frequency constant).
The ratio of kf/kp for same maximum phase deviation is _______?
Question 2
Find the bandwidth of signal S(t) using Carson’s rule where S(t) is angle modulated signal with carrier frequency fc.
S(t) = cos(2πfct) cos(2sin6000πt) + sin(2πfct) sin(2 sin6000πt)
Question 3
The maximum phase deviation of an angle modulated signal using m(t) as shown in figure is _________rad.
(Assume frequency sensitivity Kf= 1.5 Hz/V)
(Assume frequency sensitivity Kf= 1.5 Hz/V)
Question 4
A NBFM signal is converted into a WBFM signal using Armstrong method. The block diag is given below. The carrier freq. and the freq. deviation at the output is
Question 5
Direction: An FM modulator with frequency sensitivity kf = 10 Hz/V has the message signal shown in figure below
What will be the phase deviation for 0 ≤ t <1 ?
Question 6
Periodic signal shown below angle modulates a very high frequency carrier (sinusoidal). The modulated signal is given as X(t) = Ac cos[2π × 106t + Kp m(t)] and m(t) is given as :
The frequency deviation from maximum to minimum is 20 KHz. The value of Kp in the above expression is
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Sep 25ESE & GATE EC
