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Communication Systems

Q1: The minimum step size required for a Delta modulator operating at 36 samples/sec to track the signal (here u(t) is the unit step 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

A 2-10

B 2-8

C 2-6

D 2-4

ANS:B - 2-8

To avoid slope overload |m(t)| ≥ Δ . fs or |x(t)| ≥ Δ . fs 125 ≤ Δ . 25 . 210 27 ≤ Δ . 215 Δ ≥ 2-8.



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