interlaced scanning
C2Technical / Specialized
Definition
Meaning
A technique for displaying a video image by splitting each frame into two fields of alternating lines (odd and even) and refreshing them sequentially.
A signal or video standard (e.g., PAL, SECAM, NTSC) where the frame is constructed from two temporally offset fields to reduce flicker and bandwidth.
Linguistics
Semantic Notes
Primarily used in legacy TV/video engineering. The opposite is 'progressive scanning'. Often used as a compound noun or adjective ('interlaced signal').
Dialectal Variation
British vs American Usage
Differences
No significant lexical difference. The technical standards referenced differ (PAL in UK, NTSC in US).
Connotations
Same technical meaning. Increasingly connotes 'outdated' or 'legacy' technology.
Frequency
Equal frequency in relevant engineering/tech contexts. Rare outside these domains.
Vocabulary
Collocations
Grammar
Valency Patterns
[Noun] uses interlaced scanning[Noun] is displayed in interlaced scanningto convert from interlaced scanning to [Noun]Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Usage
Context Usage
Business
Rare. Might appear in procurement specs for legacy broadcast equipment.
Academic
Used in electrical engineering, media technology, and communications history papers.
Everyday
Virtually never used. A layperson might say 'old-style TV signal'.
Technical
Core term in video engineering, broadcast technology, and display specifications.
Examples
By Part of Speech
adjective
British English
- The interlaced scanning system produces a characteristic flicker on fine horizontal lines.
- We need an interlaced scanning monitor for the archive footage.
American English
- The interlaced scanning format is standard for NTSC broadcasts.
- This camera outputs an interlaced scanning signal.
Examples
By CEFR Level
- Old television sets used interlaced scanning to show pictures.
- The video looked jagged because it was recorded with interlaced scanning.
- To eliminate the combing artefacts, the deinterlacer must reconstruct frames from the two fields of interlaced scanning.
- Broadcasters traditionally favoured interlaced scanning because it halved the required bandwidth for a given refresh rate.
Learning
Memory Aids
Mnemonic
Think of a lace weaving over and under: INTERLACED scanning weaves the odd and even lines together over time.
Conceptual Metaphor
WEAVING (two fields are woven together to create a whole picture).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid translating as 'сканирование переплетения' – it's a fixed technical term 'чересстрочная развёртка'.
Common Mistakes
- Using 'interlaced' as a verb in this context (e.g., 'The video interlaced the frames'). It's primarily an adjective/noun compound.
- Confusing 'interlaced' with 'interleaved' in non-video contexts.
Practice
Quiz
What is the main visual artefact associated with interlaced scanning when capturing fast motion?
FAQ
Frequently Asked Questions
In mainstream consumer displays (LCD, OLED) and digital broadcasting (HD, UHD), progressive scanning is standard. Interlaced scanning is now largely confined to legacy broadcast archives and some niche professional video applications.
Interlaced can appear smoother for slow-moving content on CRT TVs but suffers from combing artefacts on fast motion and horizontal lines. Progressive scanning provides a stable, full-frame image, better for text, graphics, and modern displays.
It was an engineering compromise in early television to double the perceived refresh rate (reducing flicker) without exceeding the limited broadcast bandwidth available at the time.
Yes, if you want to view or edit them correctly on a modern progressive-scan display (like a computer monitor, smartphone, or modern TV), you should use a video player or editor with a good deinterlacing filter to remove the combing artefacts.