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HDTV means high-definition television. It is an umbrella category, not a single resolution: labels such as 720p and 1080i describe different combinations of picture-line count and scanning method. In the notation, the number refers approximately to the active vertical lines, while p means progressive scanning and i means interlaced scanning.
What does HDTV mean?
High-definition television describes television with greater horizontal and vertical resolution than conventional television. The Advanced Television Systems Committee (ATSC) also associates HDTV with a 16:9 picture aspect ratio. Its glossary describes HDTV as having approximately twice the resolution of conventional television in both dimensions: ATSC glossary: “High-definition television”.
The Federal Communications Commission (FCC), in a 2001 standards-era order, discussed HDTV in terms of formats including 720p and 1080i, along with 16:9 display capability and receiver and audio attributes. That order documents the definitions used in its digital-television discussion; it should not be read as a current requirement that every broadcaster or television use one particular format. FCC 01-22.
What do the numbers and letters in HDTV formats mean?
The number in a label such as 720p or 1080i indicates the approximate number of active vertical picture lines. The letter describes how those lines are scanned and delivered.
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- p means progressive: The picture lines are scanned in sequence to form a complete image.
- i means interlaced: Odd-numbered and even-numbered lines are sent as separate fields, which combine into a complete frame at the receiver.
How do 720p and 1080i differ?
The FCC’s 2001 order gives these format parameters. Its discussion lists 720p picture rates in pictures per second and 1080i rates in fields per second, so those rate measures should not be treated as interchangeable.
| Format | Picture dimensions in FCC description | Scanning method | Rate context in FCC description |
|---|---|---|---|
| 720p | 1280 pixels per line × 720 lines; 16:9 | Progressive: lines are scanned in sequence | 24, 30, or 60 pictures per second |
| 1080i | 1920 pixels per line × 1080 lines; 16:9 | Interlaced: odd and even lines are sent in separate fields | The FCC discussion describes interlaced rates in fields per second; it does not state a specific rate in the cited summary |
Both are HDTV formats, but neither the line count nor the scan method alone determines which will look better. The result depends on factors such as the source, the display, and viewing conditions; the format definitions do not establish a universal quality ranking.
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What does 1080p mean?
1080p combines 1080 vertical lines with progressive scanning. The notation identifies those two characteristics, but does not by itself specify a frame rate or the signal context. There is no single universal 1080p profile established here for broadcast, streaming, and consumer displays, so a product or service’s full specifications matter.
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The ATSC glossary and the FCC’s cited descriptions associate HDTV with a 16:9 picture. Format labels describe more than a number of lines: scanning method, rate, and the context in which a signal is produced or exchanged can also matter.
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The International Telecommunication Union’s Radiocommunication Sector (ITU-R) lists Recommendation BT.709 for HDTV production and international programme exchange. Its recommendations index also lists BT.1847 as a 1280 × 720, 16:9 progressively captured format for production and international exchange in a 50 Hz environment. The index page does not state a publication year for that listing. ITU-R broadcasting recommendations index.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Does a higher number mean a better picture?
Not automatically. The number describes vertical line count, while the letter describes scanning method; neither label alone captures the source quality, display processing, screen size, viewing distance, or motion in the content. The cited format definitions do not support a universal claim that 1080i, 1080p, or 720p will always look best.
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When comparing a television or video source, check both the display’s native resolution and which input signals it supports. A label such as “1080p” is useful, but is not a complete description of every signal the device can accept or display.
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