heterodyne

/'hetərədain/

Thân thiện

A technician adjusts a heterodyne receiver in the laboratory.

Definition

1. Adjective: Of or relating to the production of a new frequency by combining two different frequencies, especially in radio technology. This new frequency is called a "beat" frequency.
2. Verb (transitive): To combine two oscillations or waves of different frequencies to produce two new frequencies (one being the sum and the other the difference of the original frequencies). This process is fundamental in radio receivers.

Usage Examples

• Adjective:
  • The heterodyne receiver was a major advancement in radio technology.
  • They detected a heterodyne whistle caused by interference between the two signals.
• Verb:
  • The circuit is designed to heterodyne the incoming signal with a locally generated one.
  • To tune to a station, the receiver must heterodyne the radio frequency down to a lower, fixed intermediate frequency.

Advanced Usage

• Heterodyne Detection: A technique in optics and spectroscopy where two light beams (a signal and a reference "local oscillator") are combined to produce a beat frequency that can be more easily measured.
  • The scientist used heterodyne detection to analyze the faint laser signal.
• Heterodyne Principle: The fundamental concept of generating new frequencies by mixing two others.
  • The operation of modern superheterodyne receivers is based on the heterodyne principle.

Variants and Related Words

• Heterodyning (n): The process or action of combining frequencies.
  • Heterodyning converts high-frequency signals to a standard intermediate frequency.
• Superheterodyne (adj/n): A common type of receiver circuit that uses the heterodyne principle to convert all incoming signals to a single intermediate frequency for amplification.
  • Virtually all modern AM/FM radios are superheterodyne receivers.

Synonyms

• Mix (verb, in technical contexts): To combine signals.
• Beat frequency (noun, for the result): The new frequency produced by heterodyning.

Related Phrases

• Local Oscillator (LO): The internally generated signal that is mixed with the incoming signal in the heterodyne process.
  • The frequency of the local oscillator is tuned to select the desired station.
• Intermediate Frequency (IF): The standard, lower frequency produced by heterodyning, which is easier to filter and amplify.
  • After heterodyning, the signal is amplified at the intermediate frequency.

Học thuật

Adjective

1. of or relating to the beat produced by heterodyning two oscillations

Verb

1. combine (a radio frequency wave) with a locally generated wave of a different frequency so as to produce a new frequency equal to the sum or the difference between the two