Frequency Modulation Overview

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Questions and Answers

What remains constant during the frequency modulation process?

  • The frequency deviation
  • The frequency of the modulated signal
  • The amplitude of the carrier signal (correct)
  • The frequency of the modulating signal

What happens to the frequency of the modulated signal when the modulating signal reaches its positive peak?

  • It decreases to a minimum
  • It remains unchanged
  • It exceeds the center frequency (correct)
  • It becomes negative

Which signal is characterized by a high frequency and constant amplitude?

  • The carrier signal (correct)
  • The modulated signal
  • The message signal
  • The deviation signal

What does the frequency deviation represent in frequency modulation?

<p>The change in frequency from the center frequency (C)</p> Signup and view all the answers

What type of wave is the message signal in frequency modulation?

<p>Sine wave (A)</p> Signup and view all the answers

When the modulating signal is at its trough, what is the frequency of the frequency modulated signal?

<p>It is at its minimum (A)</p> Signup and view all the answers

In the context of frequency modulation, what characteristic does the frequency modulated signal display with time?

<p>It varies in response to the modulating signal (C)</p> Signup and view all the answers

What does the graph of the carrier signal primarily represent?

<p>A high frequency sine wave with constant amplitude (A)</p> Signup and view all the answers

Flashcards

Frequency Modulation (FM)

A process where the carrier signal's frequency changes based on the modulating signal's value, while the amplitude remains constant.

Carrier Signal

A high-frequency signal whose frequency is varied by the modulating signal.

Modulating Signal

The signal that causes the carrier signal's frequency to change.

Frequency Deviation

The amount by which the carrier's frequency varies from its center frequency due to the modulating signal.

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Center Frequency

The average or base frequency of the carrier signal.

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Message Signal

The input signal that is used to modulate the carrier signal in FM.

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FM Signal

The output that results from the process of frequency modulation.

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Modulating Frequency

The frequency of the message signal used in the modulation process.

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Study Notes

Frequency Modulation

  • Frequency modulation (FM) is a process where the carrier signal's frequency changes according to the modulating signal.
  • The carrier signal's amplitude remains constant.
  • The output frequency of the FM signal equals the carrier frequency when the modulating signal is zero.
  • When the modulating signal reaches its positive peak, the FM signal's frequency reaches its maximum.
  • At the negative peaks, the FM signal's frequency reaches its minimum.
  • The process shifts the carrier frequency (f) by a certain amount (Δf, frequency deviation).

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FM Modulation Explained PDF

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