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The modulation index can be derived from ________

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The modulation index can be derived from ________

(a) frequency-domain signal

(b) time-domain signal

(c) both frequency and time domain signal

(d) a highly modulated carrier wave

This question was posed to me in my homework.

My enquiry is from Demodulation of VSB Modulated Wave topic in chapter VSB Modulation of Analog Communications

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Correct option is (c) both frequency and time domain signal

Easiest explanation: Modulation index tells us the amount by which the carrier wave is varied with respect to the message signal. It can be derived for frequency-domain signals as well as for time-domain signals.

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