Carrier wave

Definition

A carrier wave is a continuous waveform that can be modulated in amplitude, frequency, or phase to transmit information. It serves as the base signal for carrying data in various communication systems.

5 Must Know Facts For Your Next Test

1. Carrier waves are typically sinusoidal and have a constant amplitude and frequency before modulation.
2. The three main types of modulation used with carrier waves are Amplitude Modulation (AM), Frequency Modulation (FM), and Phase Modulation (PM).
3. Carrier waves are essential in radio broadcasting, where they carry audio signals over long distances.
4. The frequency of a carrier wave is much higher than the frequency of the data signal it is transmitting.
5. Carrier waves can propagate through different media, including air, vacuum, and optical fibers.

Review Questions

• What are the primary types of modulation that can be applied to a carrier wave?
• Why is the frequency of a carrier wave typically much higher than that of the data signal?
• In what types of communication systems are carrier waves commonly used?

Related terms

Amplitude Modulation (AM): A technique where the amplitude of the carrier wave is varied in proportion to the data signal.

Frequency Modulation (FM): A method where the frequency of the carrier wave is varied according to the instantaneous value of the data signal.

Phase Modulation (PM): A process where the phase of the carrier wave is changed by the information signal being sent.