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?

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

What is the significance of modulation index in Amplitude Modulation?

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

What are some benefits of modulation in communication systems?

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

Define Modulation in the context of communication systems.

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

What is the difference between Baseband and Passband communication systems?

<p>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.</p> Signup and view all the answers

Explain the concept of Amplitude Modulation (AM).

<p>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.</p> Signup and view all the answers

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