Modulation Methods Quiz

What term describes the process of combining multiple signals into one signal for transmission?

In a communication system, what does demultiplexing refer to?

What is the unit of measurement for frequency?

How is wavelength defined in the context of electromagnetic waves?

What property of a signal determines its location on the frequency spectrum?

In electronic communication, what does modulation primarily involve?

Which method of modulation involves varying the phase angle of the sine wave?

What process allows two or more signals to share the same medium or channel?

Which is not one of the basic types of multiplexing?

Which device translates data from digital to analog and vice versa?

In which kind of modulation does the frequency of the carrier signal vary?

Which type of modulation involves varying the strength of the carrier signal?

What is the purpose of modulation in electronic communication?

Which of the following best describes multiplexing in communication systems?

In baseband transmission, how is information usually sent over the medium?

What is the main characteristic of a carrier signal in broadband transmission?

What distinguishes broadband transmission from baseband transmission?

What role does a radio-frequency (RF) wave play in broadband transmission?

Amplitude Modulation (AM) varies the amplitude of the sine wave to convey information.
Frequency Modulation (FM) varies the frequency of the sine wave to convey information.
Phase Modulation (PM) varies the phase angle of the sine wave to convey information.

Modulation makes the information signal more compatible with the medium.
Multiplexing allows more than one signal to be transmitted concurrently over a single medium.

A carrier is a high-frequency signal that is modulated by audio, video, or data.
A radio-frequency (RF) wave or radio wave is an electromagnetic signal that can travel long distances through space.
Broadband transmission takes place when a carrier signal is modulated, amplified, and sent to the antenna for transmission.

Frequency Division Multiplexing (FDM) allows multiple signals to share the same medium by assigning different frequencies to each signal.
Time Division Multiplexing (TDM) allows multiple signals to share the same medium by assigning different time slots to each signal.
Code Division Multiplexing (CDM) allows multiple signals to share the same medium by assigning different codes to each signal.

Demodulation or detection takes place in the receiver when the original baseband (e.g. audio) signal is extracted.
Demultiplexing at the receiver separates the multiple signals back into their original form.

The electromagnetic spectrum is the range of electromagnetic signals encompassing all frequencies.
Frequency is the number of cycles of a repetitive wave that occur in a given period of time, measured in cycles per second (cps) or Hertz (Hz).
Wavelength is the distance occupied by one cycle of a wave, usually expressed in meters.