modulated signal is generated using a carrier signal with frequency fc = 20 kHz and a message signal m(t) = sin (3000πt) + 2cos (4000πt) The modulated signal is given as; xam(t) = 5[ 1+m(t)]cos (2π*fc*t) a) Determine and sketch the magnitude spectrum of the modulated signal. b) Determine the average power in the carrier and in the sidebands.

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Amplitude modulation

A radio signal can carry information in the form of sound or image for broadcasting or communication. For it to be sent to a greater distance, the signal must be changed or modulated in some way. One of the easiest way is to change the amplitude of the signal with variations of the video or the audio signal. This is called Amplitude Modulaton. In this modulation information of message is carried in amplitude of carrier signal.