Digital Communication - Study Mode
[#91] Bandwidth (BW) of 8PSK, 16PSK modulated signals are
Correct Answer
(D) $$frac{2}{3}{R_b},,frac{1}{2}{R_b}$$
[#92] The ramp signal m(t) = at is applied to a delta modulator with sampling period T s and step size δ. Slope overload distortion would occur if
Correct Answer
(C) δ < aT s
[#93] A speech signal occupying the bandwidth of 300 Hz to 3 kHz is converted into PCM format for use in digital communication. If the sampling frequency is 8 kHz and each sample quantized into 256 levels, then the output bit rate will be
Correct Answer
(D) 64 kb/s
[#94] A signal x(t) = 100cos(24π × 10 3 )t is ideally sampled with a sampling period of 50 psec and then passed through an ideal lowpass filter with cutoff frequency of 15 kHz. Which of the following frequencies is/are present at the filter output?
Correct Answer
(D) 12 kHz and 8 kHz
[#95] In the output of a DM speech encoder, the consecutive pulses are of opposite polarity during time interval t 1 ≤ t ≤ t 2 . This indicates that during this interval
Correct Answer
(A) The input to the modulator is essentially constant