Assuming other parameters unchanged, if the modulating frequency

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Assuming other parameters unchanged, if the modulating frequency is halved in a modulating systems, the modulation index is doubled. The modulation system is—

1. A M
2. F M
3. Phase modulation
4. Angle modulation

Correct Option: B

Assuming other parameters unchanged, if the modulating frequency is halved in a modulating systems, the modulation index is doubled. Such type of modulation system is known as FM, because for FM modulation index β is inversely proportional to modulating frequency i.e.

β α	1
	f_m