For telegraphy the most commonly used modulation system is
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Communication Systems
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The main function of a balanced modulator is to
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In case of frequency modulation, modulating voltage remains constant if the modulating frequency is lowered, then
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Full duplex operation permits transmission in both directions at the same time.
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The colour of an object is decided by
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Which of the following is a digital modulation technique?
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Assertion (A): In FM the frequency of the carrier is varied by the modulating voltage
Reason (R): FM and PM are two forms of angle modulation.
Reason (R): FM and PM are two forms of angle modulation.
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PAM stands for
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Which of the following does not cause losses in optical fibre cables?
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In a FM receiver, amplitude limiter
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When the length of antenna is a whole wavelength
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Under ordinary circumstances, impulse noise can be reduced in
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Which of the following is used to generate PDM?
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A 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
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A three stage telephone switching structure is to have 128 input and 128 output terminals. There are 16 first stage and 16 third stage matrices. To avoid blocking the number of intermediate paths required is
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For a low level AM system, the amplifiers modulated stage must be
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In case of low level amplitude modulation system, the amplifiers following the modulated stage must be
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Commercial Frequency deviation of FM is
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An FM radio receiver which is tuned to a 91.6 MHz broadcast station may receive an image frequency of __________ MHz.
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In any system, excessive bandwidth is avoided because:
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