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Encyclopedia > Composite video
Composite video


The RCA connector is the most common connector for composite video. This work is copyrighted. ... This article does not cite its references or sources. ...

Type Analog video connector
Specifications
Hot pluggable yes
External yes
Video signal NTSC, PAL or SECAM video
Pins 2
Connector RCA connector, 8th inch Jack plug, etc.
Pin out
Pin 1 + +
Pin 2 - -

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. This article does not cite its references or sources. ... 2. ... Image File history File links Composite_Video. ... Analog television (or analogue television) encodes television and transports the picture and sound information as an analog signal, that is, by varying the amplitude and/or frequencies of the broadcast signal. ... In telecommunications, modulation is the process of varying a periodic waveform, i. ... RF may mean: RF, the IATA code for Florida West International Airways RF, NYSE ticker symbol for Regions Financial Corporation Royalty free Rf or RF may stand for: Radio frequency Volumetric flow rate/rate of flow (Rf) RF connectors, electrical connectors designed to work at radio frequencies Red Faction, a... This article or section does not adequately cite its references or sources. ...


It is usually in a standard format such as NTSC, PAL, or SECAM. It is a composite of three source signals called Y, U and V (together referred to as YUV) with sync pulses. Y represents the brightness or luminance of the picture and includes synchronizing pulses, so that by itself it could be displayed as a monochrome picture. U and V between them carry the color information. They are first mixed with two orthogonal phases of a color carrier signal to form a signal called the chrominance. Y and UV are then added together. Since Y is a baseband signal and UV has been mixed with a carrier, this addition is equivalent to frequency-division multiplexing. The references in this article would be clearer with a different and/or consistent style of citation, footnoting or external linking. ... Television encoding systems by nation. ... SECAM, also written SÉCAM (Séquentiel couleur à mémoire, French for Sequential Color with Memory), is an analog color television system first used in France. ... This article or section is in need of attention from an expert on the subject. ... Baseband is an adjective that describes signals and systems whose range of frequencies is measured from 0 to a maximum bandwidth or highest signal frequency; it is sometimes used as a noun for a band of frequencies starting at 0. ... Frequency-division multiplexing (FDM) is a form of signal multiplexing where multiple baseband signals are modulated on different frequency carrier waves and added together to create a composite signal. ...


Composite video can easily be directed to any broadcast channel simply by modulating the proper RF carrier frequency with it. Most analogue home video equipment records a signal in (roughly) composite format: LaserDiscs store a true composite signal, while VHS tapes use a slightly modified composite signal. These devices then give the user the option of outputting the raw signal, or modulating it on to a VHF or UHF frequency to appear on a selected TV channel. In typical home applications, the composite video signal is typically connected using an RCA jack, normally yellow (often accompanied with red and white for right and left audio channels respectively). BNC connectors and higher quality co-axial cable are often used in more professional applications. Laserdisc (LD) was the first commercial optical disc storage medium, and was used primarily for the presentation of movies as to be viewed at home. ... Bottom view of VHS cassette with magnetic tape exposed Top view of VHS cassette with front casing removed The Video Home System, better known by its abbreviation VHS is a recording and playing standard for analog video cassette recorders (VCRs), developed by Victor Company of Japan, Limited (JVC) and launched... Very high frequency (VHF) is the radio frequency range from 30 MHz (wavelength 10 m) to 300 MHz (wavelength 1 m). ... This article is about the radio frequency. ... A panel of four RCA jacks, and three RCA (cinch; phono) plugs of various quality RCA jack in PlayStation 2 An RCA jack, also referred to as a phono connector or CINCH/AV connector, is a type of electrical connector which is commonly used in the audio/video market. ... Male BNC connector Cables with BNC connectors Adapter between a female BNC connector and banana plugs Picture to show the similarity between 50 Ω and 75 Ω BNC connectors Pulse generators with BNC connectors and cables. ...


In Europe, SCART connections are often used instead of RCA jacks — though SCART can also carry far superior RGB component video signals (and to a lesser extent, S-Video), so where available, RGB is used instead of composite video with computers, video game consoles, and DVD players. This article or section is in need of attention from an expert on the subject. ... Three cables, each with RCA plugs at both ends, are often used to carry analog component video Component video is a video signal that has been split into two or more components. ... S-Video (also known as Y/C) is a baseband analog video format offering a higher quality signal than composite video, but a lower quality than RGB and component video. ... Size comparison: A 12 cm Sony DVD+RW and a 19 cm Dixon Ticonderoga pencil. ...


Some devices that connect to a TV, such as VCRs, older videogame consoles and the home computers of the 1980s, naturally output a composite signal. This may then be converted to RF with an external box known as an RF modulator that generates the proper carrier (often for channel 3 or 4 in North America, channel 36 in Europe). The RF modulator is preferably left outside the console so the RF doesn't interfere with the components inside the machine. VCRs and similar devices already have to deal with RF signals in their tuners, so the modulator is located inside the box. Also, most early home computers usually employed an internal RF modulator. The process of modulating RF with the original video signal, and then demodulating the original signal again in the TV, introduces several losses into the signal. RF is also "noisy" because of all of the video and radio signals already being broadcast, so this conversion also typically adds noise or interference to the signal as well. For these reasons, it is typically best to use composite connections instead of RF connections if possible. Almost all modern video equipment has at least composite connectors, so this typically isn't a problem; however, older video equipment and some very low-end modern televisions have only RF input (essentially the antenna jack); while RF modulators are no longer common, they are still widely available to translate baseband signals for older equipment. The Nintendo GameCube is an example of a popular video game console. ... Children playing on a Amstrad CPC 464 in the 1980s. ... This article does not cite any references or sources. ... An RF modulator (for radio frequency modulator) is a device that takes a baseband input signal and outputs a radio frequency-modulated signal. ... North America North America is a continent[1] in the Earths northern hemisphere and (chiefly) western hemisphere. ... World map showing the location of Europe. ... The videocassette recorder (or VCR, more commonly known in the British Isles as the video recorder), is a type of video tape recorder that uses removable videotape cassettes containing magnetic tape to record audio and video from a television broadcast so it can be played back later. ...


However, just as the modulation and demodulation of RF loses quality, the mixing of the various signals into the original composite signal does the same, causing a checkerboard video artifact knowns as dot crawl. Dot crawl is an infamous defect that results from crosstalk due to the intermodulation of the chrominance and luminance components of the signal. This is usually seen when chrominance is transmitted with a high bandwidth, and its spectrum reaches into the band of the luminance frequencies. This has led to a proliferation of systems such as S-Video and component video to separate out one or more of the mixed signals. The dot crawl is the popular name for a visual defect of color analog video standards when signals are transmitted as composite video. ... S-Video (also known as Y/C) is a baseband analog video format offering a higher quality signal than composite video, but a lower quality than RGB and component video. ... Three cables, each with RCA plugs at both ends, are often used to carry analog component video Component video is a video signal that has been split into two or more components. ...


When used for connecting a video source to a video display where both support 4:3 and 16:9 display formats, the PAL television standard provides for signalling pulses that will automatically switch the display from one format to the other. The Composite video connection supports this operation. However the NTSC television standard has no such provision, and thus the display will have to be manually switched.


Composite video is often designated by the CVBS acronym, meaning any of "Color, Video, Blank and Sync", "Composite Video Baseband Signal", "Composite Video Burst Signal", or "Composite Video with Burst and Sync". Color is an important part of the visual arts. ... This article does not cite any references or sources. ... There are a number of uses for the word blank: For reverting page blanking, see Wikipedia:Vandalism. ... Synchronization is coordination with respect to time. ...


Trivia

  • NTSC composite monitors are semi-compatible with PAL signals, but offer black and white picture even if the signal is in color, and have poor Vertical synchronization.
  • Almost every device with an S-video input or output also has a composite input or output.

Vertical synchronization (v-sync) refers generally to the synchronization of an event with the vertical blanking interval. ... S-Video (also known as Y/C) is a baseband analog video format offering a higher quality signal than composite video, but a lower quality than RGB and component video. ...

See also

To meet Wikipedias quality standards, this article or section may require cleanup. ... CVBS connectors were used on early home computers. ...

External links

  • Video Basics Tutorial covering CVBS format structure.

  Results from FactBites:
 
composite video Definition: TechEncyclopedia from TechWeb (318 words)
Composite video was created when color was added to fl and white TV in 1954.
The yellow RCA jack is the composite video socket found on every consumer video device.
Most all equipment supports composite video as it was the first video color format.
What is composite video? - A Word Definition From the Webopedia Computer Dictionary (122 words)
(n.) A type of video signal in which all information—the red, blue, and green signals (and sometimes audio signals as well)—are mixed together.
In contrast, most computers use RGB video, which consists of three separate signals for red, green, and blue.
In general, RGB video produces sharper images than composite video does.
  More results at FactBites »

 
 

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