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Question

Which of the following is not a type of modulation index ?

A
Amplitude modulation index
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B
Frequency modulation index
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C
Phase modulation index
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D
Carrier amplitude modulation index
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Solution

The correct option is D Carrier amplitude modulation index
There are only three types of modulation Index :
1) Amplitude Modulation Index - AM modulation index is the measure based on ratio of the modulation excursion of the RF signal to the level of the
unmodulated carrier .
h = M/A
h= amplitude modulation index
M = modulation amplitude
A =carrier amplitude
2) Frequency Modulation - FM is the encoding of information in a carrier wave by varying the instantaneous frequency of wave .
3) Phase Modulation - Phase modulation (PM) is a modulation pattern for conditioning communication signals for transmission .

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