Modulation index of an AM signal is ratio of __________ to the _______(a) Peak carrier amplitude, Peak message signal amplitude(b) Peak message signal amplitude, Peak carrier amplitude(c) Carrier signal frequency, Message signal frequency(d) Message signal frequency, Carrier signal frequencyThis question was posed to me in an interview.Question is taken from Amplitude Modulation in section Modulation Techniques for Mobile Radio of Wireless/Mobile

Modulation index of an AM signal is ratio of __________ to the _______

1.	Modulation index of an AM signal is ratio of __________ to the _______(a) Peak carrier amplitude, Peak message signal amplitude(b) Peak message signal amplitude, Peak carrier amplitude(c) Carrier signal frequency, Message signal frequency(d) Message signal frequency, Carrier signal frequencyThis question was posed to me in an interview.Question is taken from Amplitude Modulation in section Modulation Techniques for Mobile Radio of Wireless/Mobile
Answer» Right answer is (b) Peak MESSAGE signal amplitude, Peak carrier amplitude To explain: The modulation index k of an AM signal is defined as the RATIO of the peak message signal amplitude to the peak carrier amplitude. The modulation index is OFTEN EXPRESSED as a percentage. It is also called percentage modulation.

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