The ratio between the modulating signal voltage and the carrier voltage is called?(a) Amplitude modulation(b) Modulation frequency(c) Modulation index(d) Ratio of modulationI have been asked this question in an online interview.Question is taken from Amplitude Modulation and Modulation Index topic in portion Amplitude & Frequency Modulation of Avionics

The ratio between the modulating signal voltage and the carrier voltag

1.	The ratio between the modulating signal voltage and the carrier voltage is called?(a) Amplitude modulation(b) Modulation frequency(c) Modulation index(d) Ratio of modulationI have been asked this question in an online interview.Question is taken from Amplitude Modulation and Modulation Index topic in portion Amplitude & Frequency Modulation of Avionics
Answer» CORRECT choice is (c) Modulation index For EXPLANATION: For undistorted modulation to occur, the voltage of modulating signal Vm MUST be less than the carrier voltage Vc. Therefore, the relationship between the AMPLITUDE of the modulating signal and the amplitude of the carrier signal is important. This relationship, known as the modulation index m, is the ratio m = ^Vm⁄Vc.

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