Digital Communication - Study Mode
[#66] Which one of the following statements about differential pulse code modulation (DPCM) is true?
Correct Answer
(D) The difference of message signal sample with its prediction is quantized
[#67] From the following relative amplitude vs frequency plot, identify the type of noise which the sections A, B, C and D depict. List-I List-II a. Section A 1. Thermal noise b. Section B 2. Power line pick up c. Section C 3. Power supply (EPC) switching noise d. Section D 4. $$frac{1}{{ ext{f}}}$$ noise
Correct Answer
(C) a-4, b-2, c-3, d-1
[#68] For an ideal 3000 Hz channel, nyquist rate is
Correct Answer
(B) 6000 bps
[#69] Which of the following is not the modulation technique
Correct Answer
(A) PCM
[#70] The information rate to be transmitted is 900 bits/sec, FEC is $$frac{3}{4}$$, the symbol rate for QPSK modulation scheme is:
Correct Answer
(C) 600 symbols/sec