frequency-division multiplex
Low/C2Technical/Formal
Definition
Meaning
A method of transmitting multiple independent signals over a single communication channel by dividing the channel's bandwidth into distinct, non-overlapping frequency bands.
Any system, technique, or hardware that uses the principle of assigning different frequency ranges to different signals or data streams to enable simultaneous transmission and subsequent separation.
Linguistics
Semantic Notes
Specifically refers to the technique itself, not a particular instance. Used as a noun phrase or as a modifier (e.g., frequency-division multiplex system). The hyphenated form is standard. Often abbreviated as FDM.
Dialectal Variation
British vs American Usage
Differences
No significant lexical differences. Both use the same term. Possible minor pronunciation variation in the word 'frequency'.
Connotations
None beyond the technical definition.
Frequency
Equally rare and technical in both varieties, used exclusively in engineering and telecommunications contexts.
Vocabulary
Collocations
Grammar
Valency Patterns
[Frequency-division multiplex] is used to [VERB].The [NOUN] employs [frequency-division multiplex].A [frequency-division multiplex] system [VERB].Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “None.”
Usage
Context Usage
Business
Rare; might be used in technical sales, procurement, or strategy documents for telecom/network companies.
Academic
Primary usage. Found in electrical engineering, telecommunications, and computer networking textbooks and papers.
Everyday
Virtually never used.
Technical
Standard, precise term in telecommunications, signal processing, and networking engineering.
Examples
By Part of Speech
verb
British English
- The signals need to be frequency-division multiplexed.
- We are multiplexing them using frequency-division techniques.
American English
- The carrier system frequency-division multiplexes 12 voice channels.
- We multiplexed the data streams via frequency division.
adverb
British English
- The channels are transmitted frequency-division multiplex.
American English
- The data was sent frequency-division multiplex.
adjective
British English
- It's a frequency-division multiplex scheme.
- They installed frequency-division multiplex equipment.
American English
- The frequency-division multiplex approach is older.
- We need a frequency-division multiplex analyzer.
Examples
By CEFR Level
- This is too difficult for A2 level.
- Old radios and telephones used a method called frequency-division multiplex.
- Frequency-division multiplex allows a single cable to carry many television channels at the same time.
- In FDM, each signal is assigned a unique frequency band to prevent interference.
- The foundational analogue technique of frequency-division multiplex has largely been superseded by digital time-division and statistical multiplexing in core networks.
- Engineers must carefully design guard bands between channels in a frequency-division multiplex system to minimise crosstalk.
Learning
Memory Aids
Mnemonic
Imagine a radio (FREQUENCY) with many stations. Each station gets its own slice of the dial (DIVISION) so they can all broadcast at once (MULTIPLEX).
Conceptual Metaphor
A highway with multiple, parallel lanes, where each lane (frequency band) is dedicated to a different type of vehicle (signal).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid calquing as 'частотное-разделительное мультиплексирование' in running text; the standard technical term is 'частотное мультиплексирование' (FDM).
- Do not confuse with 'разделение частот' which is a broader concept; the term is a fixed compound.
Common Mistakes
- Writing it without hyphens (frequency division multiplex).
- Confusing it with 'time-division multiplexing' (TDM).
- Using it as a verb (e.g., 'to frequency-division multiplex'). The verb form is simply 'to multiplex using FDM'.
Practice
Quiz
What is the primary purpose of frequency-division multiplex?
FAQ
Frequently Asked Questions
It allows the simultaneous, continuous transmission of multiple analogue signals over a single channel without them interfering with each other.
Historically in analogue telephony (carrier systems), cable television (CATV), FM radio broadcasting, and fibre optic wavelength-division multiplexing (WDM), which is an optical form of FDM.
FDM separates signals by frequency (all signals transmit at the same time on different frequencies), while TDM separates them by time slots (signals take turns using the full bandwidth).
Yes, primarily in legacy systems, radio broadcasting, and in its optical counterpart, Wavelength-Division Multiplexing (WDM), which is crucial for modern high-capacity fibre optic networks.