1.

Consider the following:1. Pulse-position modulation.2. Pulse-code modulation.3. Pulse-width modulation.Which of the above communications are not digital?

A. 1 and 2 only
B. 2 and 3 only
C. 1 and 3 only
D. 1, 2 and 3
Answer» D. 1, 2 and 3


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