1 Crore+ students have signed up on EduRev. Have you? Download the App 
An AM signal is represented in the domain as S (c) = 4 cos 1800T + 10 cos 20002 + 4cos2200T then the bandwidth of the AM signal is _____ Hz
A 100MHz carrier is frequency modulated by 10 KHz wave. For a frequency deviation of 50 KHz, calculate the modulation index of the FM signal.
Consider a system shown in the figure1. Let X(f) and Y(f) represent the Fourier transforms of x(t) and y(t) respectively. The ideal HPF has cutoff frequency of 10 KHZ. X(f) is shown in the figure2. The positive frequency where Y(f) has spectral peaks are
Three message signals each band limited to 10 kHz, 10 kHz, and 5 KHz are transmitted through a channel using frequency division multiplexing. The modulation techniques used are any, D513SC, SSB respectively. The guard band is 2 KHz. Band width of the channel is
A signal '4 t is band limited to the frequency range 0 to f_{n}. The signal frequency is translated by multiplying it by the signal V, t —cos2πf_{c}t . The value of f_{c} such that the bandwidth of the translated signal is 1% of the carrier frequency f_{c} will be
The peak amplitude of an AM signal for tone modulation with carrier having maximum amplitude as 5 V, varies from 2 to 8 V then the sideband power is _________________________ (W)
Consider a frequency multiplier shown in the figure below.ss
A NBFM signalX Mal t with f, = 200KHz and f, ranges 50 Hz to 150 KHz is given as an input to frequency multiplier. The Maximum Frequency deviation of the NBFM is 25 Hz. The maximum frequency deviation at the output is 75 KHz.
Q. The required frequency multiplication n is
Consider a frequency multiplier shown in the figure below.ss
A NBFM signalX Mal t with f, = 200KHz and f, ranges 50 Hz to 150 KHz is given as an input to frequency multiplier. The Maximum Frequency deviation of the NBFM is 25 Hz. The maximum frequency deviation at the output is 75 KHz.
Q. The carrier frequency at the output is
SSB modulation may be viewed as a hybrid form of amplitude modulation and frequency modulation. Assuming a message signal m(t) = sin t and a carrier frequency 'f_{c}', the instantaneous frequency for the lower side band is
Given
In a certain experimental conducted with f_{m} = 1 kHz and increasing A_{m}(starting from 0 volts), it is found that the carrier component of the FM signal is reduced to zero for the first time when A_{m} = 2 volts.
The frequency sensitivity of the modulator is
If E_{x} and E_{y} represent the energies of m(t) and y(t) respectively, then _______________
Determine the spectrum of y(t) in the system shown below.
Consider the scheme shown
If x (t) = m (t) cos (co_{c}t) then y (t) is
The above schematic generates FM signal as a wideband frequency modulator
using the indirect method. The output FM signal is characterized by f_{c} = 100 MHz, Δf = 75kHz (min). If the phase modulator has a modulation index of β= 0.3 radians, then n_{1}, n_{2} are respectively
What is the standard IF frequency for AM receivers?
Consider a message signal m(t) = 2sin(10007t)
Phase sensitivity constant Kp=5rad/V
Frequency sensitivity constant K_{f}=75KHz/V
Q. If amplitude of message signal is doubled, then bandwidth for FM and PM will be
A 20 KW and 1 MHz carrier is frequency modulated by a sinusoidal signal so that the maximum frequency deviation is 50 KHz and the message signal is band limited to 500 KHz. The generated FM signal is amplitude modulated using carrier of 1 GHz.
Q. The bandwidth of the generated signal is
A 20 KW and 1 MHz carrier is frequency modulated by a sinusoidal signal so that the maximum frequency deviation is 50 KHz and the message signal is band limited to 500 KHz. The generated FM signal is amplitude modulated using carrier of 1 GHz.
Q. The bandwidth of the generated AM signal is
The input x(t) and the output y(t) of a certain nonlinear channel are related as y(t) = x(t) + 0.001 x^{2}(t)
If frequency spectrum of input signal is
Q. The bandwidth of the output signal is
The input x(t) and the output y(t) of a certain nonlinear channel are related as y(t) = x(t) + 0.001 x^{2}(t)
If frequency spectrum of input signal is
Q. Spectrum of the received signal after appropriate low pass filtering is
21 docs263 tests

21 docs263 tests
