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GATE 2023 Communication System Quiz 34
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The minimum step-size required for a Delta-Modulator operating at 32 K samples/ sec to track the signal (here u(t) is the unit function)
x(t) = 125t[u(t)–u(t – 1)] + (250 – 125t) [u(t – 1) – u(t – 2)]
so that slope overload is avoided, would be
In PCM signal m(t) = [2 sin (100 πt )+ 2 cos (100 πt)]V is sampled at Nyquist rate samples are processed by a uniform quantizer with step size .5V minimum data rate of PCM system in bits per second.
Four signals g1(t), g2(t), g3(t) and g4(t) are to be multiplexed and transmitted. g1(t) and g4(t) have a bandwidth of 4 kHz, and the remaining two signals have bandwidth of 8 kHz. Each sample requires 8 bit for encoding. What is the minimum transmission bit rate of the system.
In a PCM system, if the code word length is increased form 6 to 8 bits, the signal to quantization noise ratio improves by the factor
A delta modulator has the message signal . The minimum sampling frequency required to prevent slope overload distortion, assuming the step size as will be _____kHz.
In a DPCM system, signal m (t) = 2cos2 (50t) V is sampled at Nyquist Rate. The samples are processed by a uniform quantizer with step size 0.5. Then the bit rate of the system is ___________bits/sec.
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