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Which of the following modulation is used in data communication?

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Which of the following modulation is used in data communication?

(a) Pulse Modulation

(b) Amplitude Modulation

(c) Phase Modulation

(d) Frequency Modulation

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I would like to ask this question from Applications of VSB in division SSB Modulation of Analog Communications

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The correct answer is (a) Pulse Modulation

To elaborate: In pulse modulation, message signal in the form of pulses are varied with respect to width, amplitude or position. It is mostly used for radio navigation, microwave band and for many others. It is also highly used in data communication.

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