In Pulse Code Modulation system
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ECE · all questionsCommunication Systems
Communication Systems
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An 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
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DVD uses
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If output power of a radio receiver is doubled, its volume is increased by __________ dB.
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For attenuation of high frequencies we should use
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The disadvantage of FM over AM is that
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VSB modulation is preferred in TV because
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Which one of the following is analog?
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As per Shannon-Hartley theorem, a noise less Gaussian channel has
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In a TV receiver antenna the length of reflector rod
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To eliminate ghosts in the picture
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Circular polarization
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If in a broadcasting studio, a 1000 kHz carrier is modulated by an audio signal of frequency range 100-5000 kHz, the width of channel is __________ kHz.
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In Modulation, “carrier” is
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For a plate-modulated class C amplifier the plate supply voltage is E. The maximum plate cathode voltage could be almost high as
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A cordless telephone using separate frequencies for transmission in base and portable units is known as
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In TV systems, equalising pulses are sent during
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For a given carrier wave, maximum undistorted power is transmitted when value of modulation is
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The modulation index of an FM is changed from 0 to 1. How does the transmitted power change?
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The maximum power output of a standard A earth station over the total band allocated to satellite communication is about
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