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Which pulse modulation technique is least expensive?

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Which pulse modulation technique is least expensive?

(a) Pulse amplitude modulation

(b) Pulse width modulation

(c) Pulse position modulation

(d) Pulse code modulation

I got this question in examination.

My question is based upon Pulse Modulation topic in division Digital Communication Techniques of Avionics

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Right answer is (a) Pulse amplitude modulation

Explanation: Out of all the pulse modulation techniques, Pulse amplitude modulation is the least expensive and simplest to implement. In pulse amplitude modulation, the amplitude of the pulse varies with the amplitude of the modulating signal.

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