phase modulation

Thân thiện

A scientist adjusts the phase modulation on a radio transmitter.

Definition

Noun: - A method of signal transmission: Phase modulation is a technique in telecommunications and signal processing where the phase of a high-frequency carrier wave is varied in proportion to the instantaneous amplitude of the modulating signal (e.g., a sound or data signal). This variation encodes information onto the wave.

Usage Examples

• Noun:
  • The radio transmitter uses phase modulation for clearer audio signals.
  • Digital data can be encoded efficiently using phase modulation techniques.

Advanced Usage

• Technical Context: In engineering, "phase modulation" is often discussed in contrast to frequency modulation (FM) and amplitude modulation (AM). It is a key concept in the study of communication systems.
  • The lecture covered the advantages of phase modulation over amplitude modulation for noise resistance.

Variants and Related Words

• Phase-shift keying (PSK): A digital modulation scheme that conveys data by changing the phase of the carrier wave. It is a specific, widely used form of phase modulation.
  • Quadrature phase-shift keying (QPSK) is a common type of PSK.

Synonyms

• PM (Abbreviation): The standard abbreviation for phase modulation.
• Angle modulation: A broader category of modulation that includes both phase modulation and frequency modulation.

Related Phrases

• Modulate the phase: The verbal phrase describing the action of applying phase modulation.
  • The circuit is designed to modulate the phase of the carrier.

Related Concepts

• Carrier wave: The base high-frequency wave that is modulated.
• Modulating signal: The information-bearing signal (e.g., voice, music, data) that controls the modulation.

Học thuật

Noun

1. modulation of the phase of the carrier wave

Từ đồng nghĩa

• pm