Analog Modulation in Communications

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What is the purpose of modulation for frequency location assignment?

To overcome equipment limitation

To reduce noise and interference

To change the amplitude, frequency, or phase of a signal (correct)

To increase efficiency of radiation

Which type of modulation involves changing a periodic train of pulses in proportion to a message signal?

PPM (correct)

PCM

FM

AM

What is the main difference between Continuous Wave (CW) Modulation and Pulse Modulation?

Frequency range used

Nature of the modulating signal

The number of types of modulation

Presence of periodic train pulses (correct)

What does a modulated signal refer to?

Modulated carrier after modulation Signup and view all the answers

In modulation, what does the term 'modulating signal' refer to?

The information in the required signal Signup and view all the answers

Why is modulation used to transmit a low frequency signal using a high frequency signal?

To change the amplitude, frequency, or phase of the signal Signup and view all the answers

What does the modulation index represent in Amplitude Modulation (AM)?

The ratio of the amplitude of the message to the amplitude of the carrier Signup and view all the answers

In Double-Sideband, Large Carrier (AM/DSB-LC), what remains constant while modulating the carrier signal?

Amplitude and phase of the carrier signal Signup and view all the answers

What is the role of the envelop in Amplitude Modulation (AM)?

To represent the amplitude variation of the modulated carrier Signup and view all the answers

What happens to the frequency and phase of the carrier signal in Single-sideband, suppressed carrier (AM/SSB-SC)?

They remain constant Signup and view all the answers

How is Vestigial-sideband (AM/VSB) different from other types of Amplitude Modulation?

It preserves one complete sideband and a portion of the other sideband Signup and view all the answers

What is the main characteristic that distinguishes Double-Sideband, suppressed Carrier (AM/DSB-SC) from Double-Sideband, Large Carrier (AM/DSB-LC)?

The absence of a carrier signal in DSB-SC but not in DSB-LC Signup and view all the answers

Analog Modulation in Communications - Lecture 5

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Questions and Answers

What is the purpose of modulation for frequency location assignment?

Which type of modulation involves changing a periodic train of pulses in proportion to a message signal?

What is the main difference between Continuous Wave (CW) Modulation and Pulse Modulation?

What does a modulated signal refer to?

In modulation, what does the term 'modulating signal' refer to?

Why is modulation used to transmit a low frequency signal using a high frequency signal?

What does the modulation index represent in Amplitude Modulation (AM)?

In Double-Sideband, Large Carrier (AM/DSB-LC), what remains constant while modulating the carrier signal?

What is the role of the envelop in Amplitude Modulation (AM)?

What happens to the frequency and phase of the carrier signal in Single-sideband, suppressed carrier (AM/SSB-SC)?

How is Vestigial-sideband (AM/VSB) different from other types of Amplitude Modulation?

What is the main characteristic that distinguishes Double-Sideband, suppressed Carrier (AM/DSB-SC) from Double-Sideband, Large Carrier (AM/DSB-LC)?

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