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Audio sine waves of 3 kHz frequency are used to amplitude modulate a carrier signal of 1.5 MHz. Which of the following statements are true?A. The side band frequencies are 1506 KHz and 1494 KHzB. The bandwidth required for amplitude modulation is 6 MHzC. The bandwidth required for amplitude modulation is 3 MHzD. The side band frequencies are 1503 KHz and 1497 KHz |
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Answer» Correct Answer - D Frequency (fc) of carrier signal = 1.5 MHz `therefore f_c = 1.5 xx10^6` Hz = 1500 KHz Frequency of modulating signal (fm) = 3 KHz `therefore` Upper side band fequency (USB) = 1500 + 3 = 1503 KHz and Lower side band frequency (LSB) = 1500- 3 = 1497 KHz and bandwidth =`2f_m=2xx3`= 6 KHz Thus (d) is the correct choice . |
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