In which modulation, frequency of carrier signal is varied with the amplitude of modulating signal?(a) FM(b) AM(c) PM(d) VSBThe question was asked in a job interview.My doubt is from Carrier Acquistion Techniques in DSB-SC in chapter Double Sideband Suppressed Carrier Modulation of Analog Communications

In which modulation, frequency of carrier signal is varied with the am

1.	In which modulation, frequency of carrier signal is varied with the amplitude of modulating signal?(a) FM(b) AM(c) PM(d) VSBThe question was asked in a job interview.My doubt is from Carrier Acquistion Techniques in DSB-SC in chapter Double Sideband Suppressed Carrier Modulation of Analog Communications
Answer» Right answer is (a) FM For explanation I would say: In Frequency Modulation, the frequency of CARRIER wave is VARIED with the INSTANTANEOUS amplitude of modulating signal. The general FM modulated expression is : FM (t) = Ac sin (2πfct + βsin(2πfmt)), where SYMBOLS have their usual meaning.

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