In a 100% modulated signal, If the total transmitted power is P, then carrier power will be
For an AM wave having a power of 800 W to its carrier freqency and modulation index of 90%,the power cantent of each side bond is
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For coherent detection of digital signals, the receiver must be synchronised in
Saving in power in DSB-SC system modulated at 80% is (in comparison with AM)
An amplifier has a power gain of 200. What is its gain in dB (log 102 = 0.3)
A DSB-SC signal is generated using the carrier cos (wct ) and modulating signal x(t). The envelope of DSB -SC signal is
In FM radio broadcasting system, the maximum frequency deviation is usually
An FM signal with modulation index mf is passed through a frequency tripler, the modulation index of output signal will be
An angle modulated signal is expressed by Fa(t)= cos (2 × 108 t + 75 sin 2 × 103 t). The peak frequency deviation of carrier is the
If we add the amplitude modulated signal and narrow band FM signal with same modulation index, than resultant signal will be
Which of the following modulation are used for telecasting TV programme
1. AM
2. FM
3. Pulse modulation
4. Phase modulation
Band width requirement for commercial FM radio broad cast is
In PCM system if the quantisation level are increased from 2 to 8, the relative bandwidth will be
The signal to quantisation noise ratio in an n-bit PCM system
In a delta modulation scheme, the step height is 75 mV and step size is 1.5 ms. The maximum slope that the staircase can track is
In case a signal band limited to fm is sampled at a rate less than 2fm, the constructed signal will be
In a delta modulation system, granular noise occurs when the
For 10 bit PCM system, the signal to quantiration noise ratio is 62 dB. If the number of bits are increased by 2, then signal to noise ratio will