To generate an angle-modulated signal, u(t), a message signal, m(t), is used to frequency modulate a carrier signal, c(t), where m(t) = 5 cos(20000 t) and c(t) = 100 cos (2n fet). If the peak-frequency deviation is 20 kHz and fe = 100 MHz, determine: (1) (ii) (iii) (iv) an expression for the frequency modulated signal, u(t); the modulation index, 3, and the approximate bandwidth of the generated FM signal using Carson's rule; the amplitude of all signal components that have power level of at least 10% of the power of the unmodulated carrier component; the frequency of the signal components in c)(iii).

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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.