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Subelement H
Modulation
Section 59
Pulse Modulation
What is an important factor in pulse-code modulation using time-division multiplex?
Synchronization of transmit and receive clock pulse rates.
• Frequency separation.
• Overmodulation and undermodulation.
• Slight variations in power supply voltage.

What is an important factor in pulse-code modulation using time-division multiplex?

Synchronization of transmit and receive clock pulse rates.

When you talk on a phone while being among several users of the same line, you don't experience sharing other people's conversations. This is because of super fast switching which transmits and receives multiple signals.

Of course, the sending and receiving pulses must be precisely timed and synchronized.

For more info, please see Geeks for Geeks site article on Frequency Division and Time division multiplexing

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In a pulse-width modulation system, what parameter does the modulating signal vary?
• Pulse frequency.
Pulse duration.
• Pulse amplitude.
• Pulse intensity.

In a pulse-width modulation system, what parameter does the modulating signal vary?

Pulse duration.

Width of a wave defines the amount of time it needs, so duration is the factor that changes with the width of the wave.

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What is the name of the type of modulation in which the modulating signal varies the duration of the transmitted pulse?
• Amplitude modulation.
• Frequency modulation.
• Pulse-height modulation.
Pulse-width modulation.

What is the name of the type of modulation in which the modulating signal varies the duration of the transmitted pulse?

Pulse-width modulation.

Width of a wave defines the amount of time it needs, so duration is the factor that changes with the width of the wave.

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Which of the following best describes a pulse modulation system?
The peak transmitter power is normally much greater than the average power.
• Pulse modulation is sometimes used in SSB voice transmitters.
• The average power is normally only slightly below the peak power.
• The peak power is normally twice as high as the average power.

Which of the following best describes a pulse modulation system?

The peak transmitter power is normally much greater than the average power.

In this system, the magnitude of the amplitude of the wave carries the data. Once received, the amplitude signals have to be demodulated.

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In a pulse-position modulation system, what parameter does the modulating signal vary?
• The number of pulses per second.
The time at which each pulse occurs.
• Both the frequency and amplitude of the pulses.
• The duration of the pulses.

In a pulse-position modulation system, what parameter does the modulating signal vary?

The time at which each pulse occurs.

In addition to the magnitude of the amplitude of the wave, the duration of the wave (width) is the other key factor.

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What is one way that voice is transmitted in a pulse-width modulation system?
• A standard pulse is varied in amplitude by an amount depending on the voice waveform at that instant.
• The position of a standard pulse is varied by an amount depending on the voice waveform at that instant.
A standard pulse is varied in duration by an amount depending on the voice waveform at that instant.
• The number of standard pulses per second varies depending on the voice waveform at that instant.

What is one way that voice is transmitted in a pulse-width modulation system?

A standard pulse is varied in duration by an amount depending on the voice waveform at that instant.

In addition to the magnitude of the amplitude of the wave, the duration of the wave (width) is the other key factor.