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AM spectrum consists of ________

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AM spectrum consists of ________

(a) Carrier frequency

(b) Upper sideband

(c) Lower sideband

(d) Carrier frequency with both upper and lower sideband

The question was posed to me in class test.

This intriguing question comes from Single Tone Modulation topic in portion Amplitude Modulation of Analog Communications

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Right choice is (d) Carrier frequency with both upper and lower sideband

For explanation I would say: Spectrum of Am wave consists of a carrier with upper sideband and lower sideband. If carrier frequency is Wc, then the two sidebands produced by it are (Wc+Wm) and (Wc-Wm), where Wm is the frequency of the message signal. The amplitude of the carrier is A and that of the two sidebands are mA/2, where m is the modulation index.

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