71. One of the following bandpass digital modulation schemes is not suitable for transmission over nonlinear bandpass channels:
72. A signal of maximum frequency of 2 MHz modulated by 4 GHz carrier is DSB/SC. If the resultant signal is sampled ideally as low pass signal, the minimum sampling frequency should be
73. Consider a binary transmission system with the symbol waveforms s1(t) = Acos(ωct), s2(t) = -Acos(ωct). This modulation format is termed as
74. In PCM system, if quantization level is increased from 2 to 4, then the relative bandwidth required will . . . . . . . .
75. Source encoding in a data communication system is done in order to
76. The probability of error is minimum for
77. In FSK the carrier frequency is switched between . . . . . . . . extremes.
78. Bandwidth (BW) of 8PSK, 16PSK modulated signals are
79. The ramp signal m(t) = at is applied to a delta modulator with sampling period Ts and step size δ. Slope overload distortion would occur if
80. 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
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