Modulation and Demodulation in Communication Systems

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Questions and Answers

What is the formula for the carrier signal in amplitude modulation?

Ac cos(ω_ct)

How can a modulating signal (information signal) be expressed in amplitude modulation?

Am cos ωm t

What is the formula for the full AM signal in terms of modulation index and carrier signal?

s(t) = Ac (1 + m cos(ω_m t)) cos(ω_c t)

Explain the three parts of the frequency spectrum of an Amplitude Modulated (AM) waveform.

<ol> <li>Component at the carrier frequency fc, 2. Upper side band (USB) with highest frequency at fc+fm, 3. Lower side band (LSB) with highest frequency at fc-fm</li> </ol> Signup and view all the answers

What are the different types of Amplitude Modulation (AM) mentioned in the text?

Double Sideband with carrier (DSB-C), Double Sideband Suppressed Carrier (DSB-SC), Single Sideband (SSB), Vestigial Sideband (VSB) Signup and view all the answers

What is the significance of modulation index in Amplitude Modulation?

The modulation index determines the amount of modulation in an AM waveform. Signup and view all the answers

What are some benefits of modulation in communication systems?

Reduction in the height of antenna, Avoids mixing of signals, Increases the range of communication, Multiplexing is possible, Improves quality of reception Signup and view all the answers

Define Modulation in the context of communication systems.

Modulation is the process of combining a low-frequency message signal with a high-frequency carrier signal to produce a modulated signal. Signup and view all the answers

What is the difference between Baseband and Passband communication systems?

Baseband transmission sends the information signal as it is without modulation for short distances, while Passband transmission shifts the signal to a higher frequency with modulation for long-distance transmission. Signup and view all the answers

Explain the concept of Amplitude Modulation (AM).

Amplitude Modulation is a type of modulation where the amplitude of the carrier signal is varied in proportion to the waveform of the message signal. Signup and view all the answers

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