Definition

Noun: 1. (Electronics) The process of extracting an original information signal from a modulated carrier wave. This is the fundamental operation in a receiver that reverses the modulation process, recovering the data (e.g., audio, video, digital data) that was imposed on the carrier wave for transmission.

Usage

• General Use: The term is used almost exclusively in the fields of electronics, telecommunications, and signal processing to describe a specific technical function within a receiver circuit.
• Context: It is commonly discussed alongside its counterpart, modulation. A complete communication system requires modulation at the transmitter and demodulation at the receiver.

Examples

• Noun:
  • The radio receiver performs demodulation to convert the received radio frequency signal back into audible sound.
  • A key component in any modem is the demodulation circuit, which recovers the digital data from the analog telephone line signal.
  • The quality of the demodulation process directly affects the clarity of the received signal.

Advanced Usage

• Coherent Demodulation: A sophisticated demodulation technique that requires the receiver to have precise knowledge of the carrier wave's phase and frequency for optimal signal extraction.
• Envelope Demodulation: A simpler, non-coherent method often used in AM radio receivers, which extracts the signal by following the envelope (outer shape) of the modulated wave.

Variants and Related Words

• Demodulate (verb): To perform the act of demodulation.
  • The circuit is designed to demodulate the incoming signal efficiently.
• Demodulator (noun): The specific device or circuit that performs demodulation.
  • The demodulator is a critical component in the satellite receiver.
• Modulation (noun): The complementary process of impressing an information signal onto a carrier wave for transmission.

Synonyms

• Detection: A historical and sometimes interchangeable term in radio communications, particularly for amplitude modulation (AM).
• Signal Extraction: A descriptive phrase for the general concept.

Related Phrases/Concepts

• Modem: A portmanteau of Modulator and Demodulator, a device that performs both functions for digital data communication.
• Tuning and Demodulation: In a radio, tuning selects the desired carrier frequency, and demodulation then extracts the audio signal from it.

Noun

1. (electronics) the reception of a signal by extracting it from the carrier wave