ELL727 weekly quiz-5

A digital TV transmission using binary PCM consists of 5 TDM video channels. Each channel has a signal bandwidth of 500 kHz, sampled at 20% above the Nyquist rate and quantized to 1024 levels. The net bit-rate (in Mbps) of of this TV transmission is

A delta-modulation system operates at a sampling rate of 2 kHz with comparator/quantization levels ±2 mV. If the input signal is m(t) = kt, the maximum value of k (in V/s) that avoids slope overload is

• 1

• 4

• 2

• 8

The PSD of which of the following pulse shapes (defined over the range [0, T_b]) has a null at DC?

• cos(πt/2T_b)

• sin(πt/2T_b)

• cos(πt/T_b)

• sin(πt/T_b)

What is the nearest neighbour symbol correlation R₁ = <a_ka_k+1> (where <...> denotes average over all samples k) for a 4-PAM line code with possible symbol values {-3, -1, 1, 3}?

What is the symbol mean-square value R₀ = <a_k²> (where <...> denotes average over all samples k) for a 4-PAM line code with possible symbol values {-3, -1, 1, 3}?