Principles of Frequency and Phase Modulation (Frenzel, 2022)

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What is the modulation process that puts the message in a carrier wave by changing the instantaneous frequency of the wave?

Frequency modulation (correct)

Phase modulation

Amplitude modulation

Quadrature amplitude modulation

the carrier frequency shifts proportionately as the modulating signal's amplitude varies

True

the carrier frequency doesn't shift proportionately as the modulating signal's amplitude varies

False

The carrier frequency increases as the modulating signal amplitude increases.

True Signup and view all the answers

The carrier frequency decreases as the modulating signal amplitude increases.

False Signup and view all the answers

If a reverse relationship is implemented, a decreasing modulating signal will increase the carrier frequency above its center value, while an increasing modulating signal will decrease the carrier frequency below the center value.

True Signup and view all the answers

If a reverse relationship is implemented, a decreasing modulating signal will decrease the carrier frequency above its center value, while an increasing modulating signal will increase the carrier frequency below the center value.

False Signup and view all the answers

What term describes the amount of change in the carrier frequency caused by the modulating signal?

Frequency deviation Signup and view all the answers

What is the formula for frequency deviation?

Max deviation = carrier frequency + maximum frequency Min deviation = carrier frequency - maximum frequency Frequency deviation = Max deviation - Min deviation Signup and view all the answers

What is the sign that can be used for the total frequency deviation, indicating that the modulating signal carries the carrier above and below its center frequency?

± Signup and view all the answers

this kind of modulating signal will only have two amplitude and will also make the carrier frequency have two values (1 and 0)

Frequency-Shift Keying Signup and view all the answers

What is the term for a modulation process wherein the phase of the carrier signal is varied based on the amplitude variation of the message or modulating signal?

Phase Modulation Signup and view all the answers

Which of these modulations has a noticeable difference between frequency modulation (FM) and phase modulation (PM)?

Phase Signup and view all the answers

In which of the following does the frequency compress in accordance with the positive modulating signal while it stretches at zero deviation?

Frequency modulation Signup and view all the answers

In which of these modulation methods does the phase lag or stretch at the positive peak of the modulating signal until the second zero deviation?

Phase modulation Signup and view all the answers

Which of these modulations have lagging and leading shifts?

Phase modulation Signup and view all the answers

In which of these modulations does the modulating signal also work with a binary signal, where the modulator changes the phase of the carrier and not its frequency?

Phase Shift Keying Signup and view all the answers

In which of these modulation techniques does the signal experience a 180-degree phase shift each time it changes from 1 to 0 and from 0 to 1?

Phase Shift Keying Signup and view all the answers

What is produced when a constant frequency sine wave modulates a carrier?

Sidebands Signup and view all the answers

What is referred to as the sum and difference of the carrier and the modulating frequency?

Sidebands Signup and view all the answers

The spectrum of an FM and a PM signal is wider than AM because of sideband pairs.

True Signup and view all the answers

The spectrum of AM is wider than FM and PM because of sideband pairs.

False Signup and view all the answers

What are the formulas for computing the values of the lower sidebands (F lsb)?

(F lsb1) = Fc - Fm, (F lsb2) = Fc - 2Fm, (F lsb3) = Fc - 3Fm Signup and view all the answers

Principles of Frequency and Phase Modulation (Frenzel, 2022)

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Questions and Answers

What is the modulation process that puts the message in a carrier wave by changing the instantaneous frequency of the wave?

the carrier frequency shifts proportionately as the modulating signal's amplitude varies

the carrier frequency doesn't shift proportionately as the modulating signal's amplitude varies

The carrier frequency increases as the modulating signal amplitude increases.

The carrier frequency decreases as the modulating signal amplitude increases.

If a reverse relationship is implemented, a decreasing modulating signal will increase the carrier frequency above its center value, while an increasing modulating signal will decrease the carrier frequency below the center value.

If a reverse relationship is implemented, a decreasing modulating signal will decrease the carrier frequency above its center value, while an increasing modulating signal will increase the carrier frequency below the center value.

What term describes the amount of change in the carrier frequency caused by the modulating signal?

What is the formula for frequency deviation?

What is the sign that can be used for the total frequency deviation, indicating that the modulating signal carries the carrier above and below its center frequency?

this kind of modulating signal will only have two amplitude and will also make the carrier frequency have two values (1 and 0)

What is the term for a modulation process wherein the phase of the carrier signal is varied based on the amplitude variation of the message or modulating signal?

Which of these modulations has a noticeable difference between frequency modulation (FM) and phase modulation (PM)?

In which of the following does the frequency compress in accordance with the positive modulating signal while it stretches at zero deviation?

In which of these modulation methods does the phase lag or stretch at the positive peak of the modulating signal until the second zero deviation?

Which of these modulations have lagging and leading shifts?

In which of these modulations does the modulating signal also work with a binary signal, where the modulator changes the phase of the carrier and not its frequency?

In which of these modulation techniques does the signal experience a 180-degree phase shift each time it changes from 1 to 0 and from 0 to 1?

What is produced when a constant frequency sine wave modulates a carrier?

What is referred to as the sum and difference of the carrier and the modulating frequency?

The spectrum of an FM and a PM signal is wider than AM because of sideband pairs.

The spectrum of AM is wider than FM and PM because of sideband pairs.

What are the formulas for computing the values of the lower sidebands (F lsb)?

What is the meaning of FM?

What is the meaning of Fd in frequency modulation?

What does 'Mf' stand for in frequency modulation?

What is the formula for the modulation index (Mf)?

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