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  • (i) Draw the plot of amplitude versus ω for an amplitude modulated wave whose carrier wave omega > omega _c carrying two modulating signals

 (i) Draw the plot of amplitude versus ω for an amplitude modulated wave whose carrier wave \left ( \omega >\omega _c \right ) is carrying two modulating signals,\omega _1 \: and \: \omega _2\left ( \omega _2 >\omega _1 \right )
(ii) Is the plot symmetrical about \omega _c? Comment especially about plot in region \left ( \omega <\omega _c \right )
(iii) Extrapolate and predict the problems one can expect if more waves are to be modulated.
(iv) Suggest solutions to the above problem. In the process can one understand another advantage of modulation in terms of bandwidth?

Answers (1)

ii)  No, the plot of the frequency spectrum is not symmetrical due to the crowding for \left ( \omega <\omega _c \right ) the present in the spectrum

iii) The probability of mixing of signals is very high due to the crowding at \left ( \omega <\omega _c \right )

iv) An easy way to accommodate more signals would be to increase the bandwidth and frequency of the carrier waves.

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