Information about Low Definition Television
Low-definition television or LDTV refers to television systems that have a lower resolution than standard-definition television systems. The term is usually used in reference to digital television, in particular when broadcasting at the same (or similar) resolution as analog systems.
An upcoming source of LDTV using standard broadcasting techniques are mobile TV services powered by DVB-H or DMB.
The Video CD format uses a progressive LDTV signal (352 × 240 or 288), which is half the vertical resolution of SDTV.
A professionally duplicated VHS tape could be considered borderline SDTV, but any attempt to use VHS for production will yield results comparable to LDTV. VHS supports interlace and high motion, which are not typical of LDTV signals.
Older video game consoles such as the Nintendo Entertainment System generated a non-standard version of NTSC or PAL in which the two fields did not interlace, and instead were displayed directly on top of each other, keeping the orientation of the scanlines constant. This would be 240p and 288p respectively.
The NTSC PlayStation, for example, was capable of true 480i output, but most games used 240p mode due to limited graphics and CPU power [1].
More recent systems now always use properly interlaced NTSC or PAL, except when running games designed for older, but compatible systems. The PS2 will generate 240p/288p if a PS1 game calls for this mode. Similarly, the Nintendo Wii, if using a composite cable, switches to a 240p mode in the Virtual Console for games designed for it, excluding the N64, for which games are rendered in 480 lines.
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Sources
The most common source of LDTV programming is the Internet, where mass distribution of higher resolution files could overwhelm servers and take too long to download. Portable devices such as Apple’s video iPod, or Sony’s PlayStation Portable use LDTV video, as higher resolution files would be excessive to the needs of their small screens (320 × 240 and 480 × 272 pixels respectively). The current generation of iPods still have LDTV screens, as does the iPhone. (320×480)An upcoming source of LDTV using standard broadcasting techniques are mobile TV services powered by DVB-H or DMB.
The Video CD format uses a progressive LDTV signal (352 × 240 or 288), which is half the vertical resolution of SDTV.
A professionally duplicated VHS tape could be considered borderline SDTV, but any attempt to use VHS for production will yield results comparable to LDTV. VHS supports interlace and high motion, which are not typical of LDTV signals.
Older video game consoles such as the Nintendo Entertainment System generated a non-standard version of NTSC or PAL in which the two fields did not interlace, and instead were displayed directly on top of each other, keeping the orientation of the scanlines constant. This would be 240p and 288p respectively.
The NTSC PlayStation, for example, was capable of true 480i output, but most games used 240p mode due to limited graphics and CPU power [1].
More recent systems now always use properly interlaced NTSC or PAL, except when running games designed for older, but compatible systems. The PS2 will generate 240p/288p if a PS1 game calls for this mode. Similarly, the Nintendo Wii, if using a composite cable, switches to a 240p mode in the Virtual Console for games designed for it, excluding the N64, for which games are rendered in 480 lines.
Teleconferencing LDTV
An upcoming source of LDTV using standard broadcasting techniques are mobile TV services powered by DVB-H or DMB -- however this kind of LDTV transmission technolgy is based on existent LDTV teleconferencing standards that have been in place for a decade or more.See also
| Designation | Usage examples | Definition (lines) | Rate (Hz) | |
|---|---|---|---|---|
| Interlaced (fields) | Progressive (frames) | |||
| Low; MP@LL | LDTV, VCD | 240; 288 (SIF) | 24, 30; 25 | |
| Standard; MP@ML | SDTV, SVCD, DVD, DV | 480 (NTSC, PAL-M) | 60 | 24, 30 |
| 576 (PAL, SECAM) | 50 | 25 | ||
| Enhanced | EDTV | 480; 576 | 60; 50 | |
| High; MP@HL | HDTV, HD DVD, Blu-ray Disc, HDV | 720 | 24, 30, 60; 25, 50 | |
| 1080 | 50, 60 | 24, 30; 25 | ||
) Visual comparison of common video/TV display resolutions | ||||
| This table illustrates total horizontal and vertical pixel resolution via box size. It does not accurately reflect the screen shape (aspect ratio) of these formats, which is either 4:3 or 16:9. | ||||
| [ edit ] Video formats |
|---|
| Analog broadcast |
| 525 lines: NTSC | NTSC-J | PAL-M |
| 625 lines: PAL | PAL-N | PALplus | SECAM |
| Defunct systems: Pre-1940 | 405 lines | 819 lines | Baird-Nipkow | MAC | MUSE |
| Multichannel audio: BTSC (MTS) | NICAM-728 | Zweiton (A2, IGR) |
| Hidden signals: Captioning | Teletext | CGMS-A | GCR | PDC | VBI | VEIL | VITC | WSS | XDS |
| Digital broadcast |
| Interlaced: SDTV (480i, 576i) | HDTV (1080i) |
| Progressive: LDTV (240p, 288p, 1seg) | EDTV (480p, 576p) | HDTV (720p, 1080p) |
| Digital TV standards: MPEG-2: ATSC, DVB, ISDB | MPEG-4: SBTVD |
| Multichannel audio: AAC (5.1) | Musicam | PCM | LPCM |
| Hidden signals: Captioning | Teletext | (CPCM/Broadcast flag) | AFD | EPG |
| Digital cinema: UHDV (2540p, 4320p) | DCI | 22.2 audio |
| Technical issues: | MPEG transport | Standards conversion | Video processing | VOD |
Standard-definition television or SDTV refers to television systems that have a resolution that meets standards but not considered either enhanced definition or high definition.
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Digital television (DTV) is a telecommunication system for broadcasting and receiving moving pictures and sound by means of digital signals, in contrast to analog signals used by analog (traditional) TV.
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iPod is a brand of portable media player designed and marketed by Apple and launched in October 2001. The line-up currently consists of the original style hard drive-based flagship iPod classic, the iPhone-like iPod touch, the mid-level video-capable iPod nano, and the low-end
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JP December 12, 2004
NA March 24, 2005
KR May 2, 2005
EU September 1, 2005
AU September 1, 2005
System storage Memory Stick PRO Duo
Connectivity Wi-Fi (802.
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NA March 24, 2005
KR May 2, 2005
EU September 1, 2005
AU September 1, 2005
System storage Memory Stick PRO Duo
Connectivity Wi-Fi (802.
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Quarter Video Graphics Array (also known as Quarter VGA or QVGA) is a popular term for a computer display with 320 × 240 resolution. QVGA displays are most often seen in mobile phones, PDAs and some handheld game consoles.
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DVB-H (Digital Video Broadcasting - Handheld) is a technical specification for bringing broadcast services to handheld receivers. DVB-H was formally adopted as ETSI standard EN 302 304 in November 2004.
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Digital Multimedia Broadcasting (DMB) is a digital radio transmission system for sending multimedia (radio, TV, and datacasting) to mobile devices such as mobile phones.
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Compact Disc Digital Video (VCD)
A standard pressed compact disc
Media type: optical disc
Encoding: MPEG-1 video + audio
Capacity: up to 800 MiB
Read mechanism: 780 nm wavelength semiconductor laser
Developed by: Sony & Philips
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A standard pressed compact disc
Media type: optical disc
Encoding: MPEG-1 video + audio
Capacity: up to 800 MiB
Read mechanism: 780 nm wavelength semiconductor laser
Developed by: Sony & Philips
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Progressive or noninterlaced scanning is any method for displaying, storing or transmitting moving images in which all the lines of each frame are drawn in sequence.
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Video Home System
Top view of VHS cassette with ruler for scale
Media type: Video recording media
Encoding: FM on magnetic tape
Developed by: JVC (Japan Victor Company)
Usage: Audio/Video Storage
The Video Home System [1]
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Top view of VHS cassette with ruler for scale
Media type: Video recording media
Encoding: FM on magnetic tape
Developed by: JVC (Japan Victor Company)
Usage: Audio/Video Storage
The Video Home System [1]
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Interlace is a technique of improving the picture quality of a video signal without consuming any extra bandwidth. It was invented by RCA engineer Randall C. Ballard in the 1930s.
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High motion is the characteristic of video or film footage displayed possessing a sufficiently high frame rate (or field rate) that moving images do not blur or strobe even when tracked closely by the eye. The most common forms of high motion are NTSC and PAL video (ie.
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JPN July 15, 1983
USA October 18, 1985
CAN February 1986
EUR September 1, 1986[1]
EUR/AUS 1987<ref name="eur_regions" />
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USA October 18, 1985
CAN February 1986
EUR September 1, 1986[1]
EUR/AUS 1987<ref name="eur_regions" />
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Interlace is a technique of improving the picture quality of a video signal without consuming any extra bandwidth. It was invented by RCA engineer Randall C. Ballard in the 1930s.
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PlayStation (プレイステーション
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WII may refer to:
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- Wildlife Institute of India (WII)
- Wii, a video game console released by Nintendo
See also
- World War II (WWII)
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Composite video, also called CVBS (Composite Video Blanking and Sync), is the format of an analog television (picture only) signal before it is combined with a sound signal and modulated onto an RF carrier.
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virtual console (VC, sometimes virtual terminal, VT) is a conceptual combination of the keyboard and the display for a user interface. The concrete combination is the system console of the computer, where the user can switch between the virtual consoles to
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DVB-H (Digital Video Broadcasting - Handheld) is a technical specification for bringing broadcast services to handheld receivers. DVB-H was formally adopted as ETSI standard EN 302 304 in November 2004.
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Digital Multimedia Broadcasting (DMB) is a digital radio transmission system for sending multimedia (radio, TV, and datacasting) to mobile devices such as mobile phones.
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In telecommunication, teleconference is the live exchange and mass articulation of information among persons and machines remote from one another but linked by a telecommunications system, usually over the phone line.
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Digital television (DTV) is a telecommunication system for broadcasting and receiving moving pictures and sound by means of digital signals, in contrast to analog signals used by analog (traditional) TV.
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Digital Audio Broadcasting (DAB), also known as Eureka 147, is a technology for broadcasting of audio using digital radio transmission.
The original objectives of converting to digital transmission were to enable higher fidelity, more stations and more resistance to
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The original objectives of converting to digital transmission were to enable higher fidelity, more stations and more resistance to
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DVB, short for Digital Video Broadcasting, is a suite of internationally accepted open standards for digital television. DVB standards are maintained by the DVB Project, an industry consortium with more than 270 members, and they are published by a
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ATSC Standards document a digital television format which will replace (in the United States) the analog NTSC television system[1] (NTSC is used mostly in North America and Japan). It was developed by the Advanced Television Systems Committee.
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Integrated Services Digital Broadcasting (ISDB) is the digital television (DTV) and digital radio format that Japan has created to allow radio and television stations there to convert to digital.
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Introduction
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All Movie Guide profile
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EDTv is a comedy film directed by Ron Howard released in 1999.
It stars Matthew McConaughey, Jenna Elfman, Woody Harrelson, Elizabeth Hurley, Ellen DeGeneres, Martin Landau, Rob Reiner, Sally Kirkland,
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|/ IMDb profile
EDTv is a comedy film directed by Ron Howard released in 1999.
It stars Matthew McConaughey, Jenna Elfman, Woody Harrelson, Elizabeth Hurley, Ellen DeGeneres, Martin Landau, Rob Reiner, Sally Kirkland,
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High-definition television (HDTV) is a digital television broadcasting system with a significantly higher resolution than traditional formats (NTSC, SECAM, PAL). While some early analog HDTV formats were broadcast in Europe and Japan, HDTV is usually broadcast digitally,
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