21. In Pulse Code Modulation system
22. 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
23. DVD uses
24. If output power of a radio receiver is doubled, its volume is increased by __________ dB.
25. For attenuation of high frequencies we should use
26. The disadvantage of FM over AM is that
27. VSB modulation is preferred in TV because
28. Which one of the following is analog?
29. As per Shannon-Hartley theorem, a noise less Gaussian channel has
30. In a TV receiver antenna the length of reflector rod
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