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In case of frequency modulation, modulating voltage remains constant if the modulating frequency is lowered, then
B. amplitude of distant sidebands increases
B. amplitude of distant sidebands increases
See lessUnder ordinary circumstances, impulse noise can be reduced in
A. fm only
A. fm only
See lessIn case of low level amplitude modulation system, the amplifiers following the modulated stage must be
B. linear devices
B. linear devices
See lessA zero mean white Gaussian noise is passed through an ideal low pass filter of bandwidth 10 kHz. The output of the samples so obtained would be
B. statistically independent
B. statistically independent
See lessSSB can be generated b
D. all of the above
D. all of the above
See lessWhich of the following is used to generate PDM?
B. monostable multi-vibrator
B. monostable multi-vibrator
See lessWhich of the following is a digital modulation technique?
B. psk
B. psk
See lessThe disadvantage of FM over AM is that
D. large bandwidth is required
D. large bandwidth is required
See lessWhich one of the following is analog?
B. pwm
B. pwm
See lessAn audio signal (say from 50 Hz to 10000 Hz) is frequency translated by a carrier having a frequency of 106 Hz. The values of initial (without frequency translation) and final (after frequency translation) fractional change in frequency from one band edge to the other are
A. 200 and 1.01
A. 200 and 1.01
See less