Digital Communication - Study Mode
[#1] In delta modulation, the slope overload distortion can be reduced by
Correct Answer
(D) Increasing the step size
[#2] Let x(t) = 2cos(800πt) + cos(1400πt).x(t) is sampled with the rectangular pulse train shown in the figure. The only spectral components (in kHz) present in the sampled signal in the frequency range 2.5 kHz to 3.5 kHz are
Correct Answer
(D) 2.7, 3.3
[#3] If E b , the energy per bit of a binary digital signal, is 10 -5 Watt-sec and the one-sided power spectral density of the white noise, N 0 = 10 -6 W/Hz, then the output SNR of the matched filter is
Correct Answer
(B) 10 dB
[#4] In a digital communication system employing Frequency Shift Keying (FSK), the 0 and 1 bit are represented by sine waves of 10 kHz and 25 kHz respectively. These waveforms will be orthogonal for a bit interval of
Correct Answer
(B) 200 μsec
(F) 200 µsec
[#5] If the number of bits per sample in a PCM system is increased from a n to n + 1, the improvement in signal to quantization nose ratio will be
Correct Answer
(C) 2n dB