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1080i is the shorthand name of a format of high-definition video
High-definition video

High-definition video or HD video generally refers to any video system of higher than Standard-definition_television, most commonly at display resolutions of 1280?720 or 1920?1080 ....
 modes. 1080 denotes the number of horizontal scan lines - also known as vertical resolution - and the letter i stands for interlace
Interlace

Interlaced scan refers to one of two common methods for "painting" a video image on an electronic display screen by scanning or displaying each line or row of pixels....
d. In the alternate format of high-definition video mode, known as 1080p
1080p

1080p is the shorthand name for a category of HDTV video modes. The number "1080" represents 1,080 lines of vertical Display resolution , while the letter p stands for progressive scan ....
, the p would stand for progressive scan
Progressive scan

Progressive or noninterlaced scanning is a method for displaying, storing or transmitting moving images in which all the lines of each Film frame are drawn in sequence....
.

1080i is a high-definition television
High-definition television

High-definition television is a digital television broadcasting system with higher than traditional television systems . HDTV is digitally broadcast; the earliest implementations used analog broadcasting, but today digital television signals are used, requiring less Bandwidth due to digital video compression....
 (HDTV) video mode. The term usually assumes a widescreen
Widescreen

A widescreen image is a film, computer or television image with a wider and shorter aspect ratio than the standard Academy frame developed during the classical Hollywood cinema era....
 aspect ratio
Aspect ratio (image)

The aspect ratio of an is its width divided by its height.Aspect ratios are mathematically expressed as x :y and x?y . The most common aspect ratios used today in the presentation of films in movie theaters are 1.85:1 and 2.39:1....
 of 16:9, implying a horizontal resolution of 1920 pixels and a frame resolution of 1920 × 1080 or about 2.07 million pixels.

The field rate
Field rate

The field rate of an interlaced video image is twice the effective frame rate, since interlacing draws only half of the image at a time. For example, a field rate of 60 Hertz will correspond to a 30 frames-per-second moving picture....
 of 1080i is typically 60 Hz
Hz

Hz or hz may mean:*Herero language *Hertz, unit of frequency*Hamilton Zoo, New Zealand...
 for NTSC
NTSC

NTSC is the analog television system used in most of the Americas, Japan, South Korea, Taiwan, the Philippines, Burma, and some Pacific island nations and territories ....
 countries (such as United States, Canada and Japan) or 50Hz for PAL
PAL

PAL, short for Phase Alternating Line, is a color-encoding system used in broadcast television systems in large parts of the world. Other common analog television systems are SECAM and NTSC....
/SECAM
SECAM

SECAM, also written S?CAM , is an analog television system first used in France.A team led by Henri de France working at Compagnie Fran?aise de T?l?vision invented SECAM....
 countries (such as in Europe, Australia, much of Asia, Africa).






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1080i is the shorthand name of a format of high-definition video
High-definition video

High-definition video or HD video generally refers to any video system of higher than Standard-definition_television, most commonly at display resolutions of 1280?720 or 1920?1080 ....
 modes. 1080 denotes the number of horizontal scan lines - also known as vertical resolution - and the letter i stands for interlace
Interlace

Interlaced scan refers to one of two common methods for "painting" a video image on an electronic display screen by scanning or displaying each line or row of pixels....
d. In the alternate format of high-definition video mode, known as 1080p
1080p

1080p is the shorthand name for a category of HDTV video modes. The number "1080" represents 1,080 lines of vertical Display resolution , while the letter p stands for progressive scan ....
, the p would stand for progressive scan
Progressive scan

Progressive or noninterlaced scanning is a method for displaying, storing or transmitting moving images in which all the lines of each Film frame are drawn in sequence....
.

1080i is a high-definition television
High-definition television

High-definition television is a digital television broadcasting system with higher than traditional television systems . HDTV is digitally broadcast; the earliest implementations used analog broadcasting, but today digital television signals are used, requiring less Bandwidth due to digital video compression....
 (HDTV) video mode. The term usually assumes a widescreen
Widescreen

A widescreen image is a film, computer or television image with a wider and shorter aspect ratio than the standard Academy frame developed during the classical Hollywood cinema era....
 aspect ratio
Aspect ratio (image)

The aspect ratio of an is its width divided by its height.Aspect ratios are mathematically expressed as x :y and x?y . The most common aspect ratios used today in the presentation of films in movie theaters are 1.85:1 and 2.39:1....
 of 16:9, implying a horizontal resolution of 1920 pixels and a frame resolution of 1920 × 1080 or about 2.07 million pixels.

The field rate
Field rate

The field rate of an interlaced video image is twice the effective frame rate, since interlacing draws only half of the image at a time. For example, a field rate of 60 Hertz will correspond to a 30 frames-per-second moving picture....
 of 1080i is typically 60 Hz
Hz

Hz or hz may mean:*Herero language *Hertz, unit of frequency*Hamilton Zoo, New Zealand...
 for NTSC
NTSC

NTSC is the analog television system used in most of the Americas, Japan, South Korea, Taiwan, the Philippines, Burma, and some Pacific island nations and territories ....
 countries (such as United States, Canada and Japan) or 50Hz for PAL
PAL

PAL, short for Phase Alternating Line, is a color-encoding system used in broadcast television systems in large parts of the world. Other common analog television systems are SECAM and NTSC....
/SECAM
SECAM

SECAM, also written S?CAM , is an analog television system first used in France.A team led by Henri de France working at Compagnie Fran?aise de T?l?vision invented SECAM....
 countries (such as in Europe, Australia, much of Asia, Africa). Because of this the two most common frame rate
Frame rate

Frame rate, or frame frequency, is the measurement of the frequency at which an imaging device produces unique consecutive images called Film frames....
s are 30 frames per second or 25 frames per second. Both variants can be transmitted by both major digital television
Digital television

Digital television is the sending and receiving of moving images and sound by Discrete signal signals, in contrast to the Analog television used by analog TV....
 formats, ATSC and DVB
DVB

Digital Video Broadcasting is a suite of internationally accepted open standards for digital television. DVB standards are maintained by the DVB Project, an international industry consortium with more than 270 members, and they are published by a Joint Technical Committee of European Telecommunications Standards Institute , Europ...
. The frame rate can be either implied by the context or specified after the letter i, such as "1080i30". The European Broadcasting Union
European Broadcasting Union

The European Broadcasting Union is a confederation of 75 broadcasting organisations from 56 countries, and 43 associate broadcasters from a further 25....
 (EBU), prefers to use the resolution and frame rate separated by a slash
Slash (punctuation)

The slash is a punctuation mark. It is also called a virgule, diagonal, stroke, forward slash, oblique dash, slant, separatrix, scratch comma, over, slak, whack....
, as in 1080i/30 and 1080i/25, likewise 480i/30 and 576i/25.

1080i is directly compatible with CRT
Cathode ray tube

The cathode ray tube is a vacuum tube containing an electron gun and a fluorescent screen, with internal or external means to accelerate and deflect the electron beam, used to create images in the form of light emitted from the fluorescent screen....
-based HDTV sets. 1080i is compatible with newer 720p
720p

720p is the shorthand name for a category of High-definition television video modes. The number 720 stands for the 720 horizontal scan lines of display resolution , while the letter p stands for progressive scan or non-interlaced....
- and 1080p
1080p

1080p is the shorthand name for a category of HDTV video modes. The number "1080" represents 1,080 lines of vertical Display resolution , while the letter p stands for progressive scan ....
-based televisions but must be deinterlaced
Deinterlacing

Deinterlacing is the process of converting interlaced video, like common analog television signals, into a non-interlaced form....
 first in order to be displayed on those sets. Of note, a very popular panel size used in mid-range HDTVs is 1366 x 768; they are often advertised as 1080i "compatible" or "HD ready" - however these TVs, while accepting a 1080i signal will scale it down to the panel size of 1366x768 as they are physically incapable of displaying 1920x1080 resolutions.

Due to revision of the NTSC format when color became available, the frame rate of actual 1080i broadcasts is usually 0.1% slower than is implied. For example, a 1080i30 or "30 Hz" transmission actually displays about 29.97 frames each second. Both the straight 24/30/60 and 23.976/29.97/59.94 frequencies are supported by current standards. In European countries where PAL
PAL

PAL, short for Phase Alternating Line, is a color-encoding system used in broadcast television systems in large parts of the world. Other common analog television systems are SECAM and NTSC....
 has been used, it is common to code 1080i in 25 frame/s
Frame rate

Frame rate, or frame frequency, is the measurement of the frequency at which an imaging device produces unique consecutive images called Film frames....
 which is equal to 50 fields/s.

Progressive format 1080p
1080p

1080p is the shorthand name for a category of HDTV video modes. The number "1080" represents 1,080 lines of vertical Display resolution , while the letter p stands for progressive scan ....
 (in 50 Hz or 60 Hz) is becoming common in production and is foreseen as the future broadcasting standard. Today EBU recommends that 720p at 50Hz be used for distribution.

See also


  • 1080p
    1080p

    1080p is the shorthand name for a category of HDTV video modes. The number "1080" represents 1,080 lines of vertical Display resolution , while the letter p stands for progressive scan ....
  • D-VHS
    D-VHS

    D-VHS is a digital video format developed by JVC, in collaboration with Hitachi, Ltd., Matsushita, and Philips. The "D" in D-VHS originally stood for Data VHS, but with the expansion of the format from standard definition to high definition capability, JVC renamed it Digital VHS and uses that designation on its website....


External links

  • (EBU
    European Broadcasting Union

    The European Broadcasting Union is a confederation of 75 broadcasting organisations from 56 countries, and 43 associate broadcasters from a further 25....
     technical publication)
  • - CNET Review - December 5, 2007