Question

Find the number of pulses, if the number of level is 128 in PCM?

(a) 3

(b) 6

(c) 4

(d) 7

The question was posed to me by my college director while I was bunking the class.

The above asked question is from Power Calculation topic in chapter Amplitude Modulation of Analog Communications

Answer 1

Right choice is (d) 7

Best explanation: A pulse in signal processing is a rapid, transient change in the amplitude of a signal from a baseline value to a higher or lower value, followed by a rapid return to the baseline value.

Therefore,

2^n = 128, so n = 7.