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Text of the page (random words):
composite video wikipedia 935 captures 08 mar 2004 21 sep 2026 aug sep oct 29 2021 2022 2023 success fail about this capture timestamps the wayback machine http web archive org web 20220929225530 https en wikipedia org wiki composite_video composite video from wikipedia the free encyclopedia jump to navigation jump to search analog video signal format not to be confused with component video composite video on consumer products a yellow rca connector is typically used for composite video type analog video connector production history designed 1954 1 1956 2 general specifications length maximum of 50 m citation needed external yes video signal ntsc pal or secam video pins 1 plus grounding shield connector rca connector electrical signal 1 5 volt citation needed pinout pin 1 center video pin 2 sheath ground composite video is an analog video signal format that carries standard definition video typically at 525 lines or 625 lines as a single channel video information is encoded on one channel unlike the higher quality s video two channels and the even higher quality component video three or more channels in all of these video formats audio is carried on a separate connection composite video is also known by the initials cvbs for composite video baseband signal or color video blanking and sync 3 4 or is simply referred to as sd video for the standard definition television signal it conveys there are three dominant variants of composite video signals corresponding to the analog color system used ntsc pal and secam usually composite video is carried by a yellow rca connector but other connections are used in professional settings contents 1 signal components 1 1 composite artifacts 1 2 recording 1 3 extensions 2 connectors and cable 3 modulators 3 1 demodulation loss 4 see also 5 notes 6 references 7 external links signal components edit ntsc composite video signal analog a composite video signal combines on one wire the video information required to recreate a color picture as well as line and frame synchronization pulses the color video signal is a linear combination of the luminance y displaystyle y of the picture and a modulated subcarrier which carries the chrominance or color information c displaystyle c a combination of hue and saturation details of the combining process vary between the ntsc pal and secam systems the frequency spectrum of the modulated color signal overlaps that of the baseband signal and separation relies on the fact that frequency components of the baseband signal tend to be near harmonics of the horizontal scanning rate while the color carrier is selected to be an odd multiple of half the horizontal scanning rate this produces a modulated color signal that consists mainly of harmonic frequencies that fall between the harmonics in the baseband luma signal rather than both being in separate continuous frequency bands alongside each other in the frequency domain the signals may be separated using a comb filter 5 in other words the combination of luma and chrominance is indeed a frequency division technique but it is much more complex than typical frequency division multiplexing systems like the one used to multiplex analog radio stations on both the am and fm bands a gated and filtered signal derived from the color subcarrier called the burst or colorburst is added to the horizontal blanking interval of each line excluding lines in the vertical sync interval as a synchronizing signal and amplitude reference for the chrominance signals in ntsc composite video the burst signal is inverted in phase 180 out of phase from the reference subcarrier 6 in pal the phase of the color subcarrier alternates on successive lines in secam no colorburst is used since phase information is irrelevant composite artifacts edit enlarged detail from a video source exhibiting dot crawl note the distinctive checkerboard pattern on the vertical edges between yellow and blue areas the combining of component signals to form the composite signal does the same causing a checkerboard video artifact known as dot crawl dot crawl is a 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 high bandwidth and its spectrum reaches into the band of the luminance frequencies comb filters are commonly used to separate signals and eliminate these artifacts from composite sources s video and component video avoid this problem as they maintain the component signals separately recording edit most home analog video equipment record a signal in roughly composite format laserdiscs store a true composite signal while consumer videotape formats including vhs and betamax and commercial and industrial tape formats including u matic use modified composite signals generally known as color under 7 the professional d 2 videocassette format digitally records and reproduces composite video signals using pcm encoding of the analog signal on the magnetic tape extensions edit a number of so called extensions to the visible tv image can be transmitted using composite video since tv screens hide the vertical blanking interval of a composite video signal these take advantage of the unseen parts of the signal examples of extensions include teletext closed captioning information regarding the show title a set of reference colors that allows tv sets to automatically correct ntsc hue maladjustments widescreen signaling wss for switching between 4 3 and 16 9 display formats etc connectors and cable edit rear of the polish elwro 800 junior computer din output carries a composite video signal to an external monitor 8 intergraph intense3d voodoo rush with tv out s video topmost connector and composite video yellow rca connector below in home applications the composite video signal is typically connected using an rca connector normally yellow it is often accompanied with red and white connectors for right and left audio channels respectively bnc connectors and higher quality coaxial cable are often used in professional television studios and post production applications bnc connectors were also used for composite video connections on early home vcrs often accompanied by either rca connector or a 5 pin din connector for audio the bnc connector in turn post dated the pl 259 connector featured on first generation vcrs video cables are 75 ohm impedance low in capacitance typical values run from 52 pf m for an hdpe foamed dielectric precision video cable to 69 pf m for a solid pe dielectric cable 9 modulators edit some devices that connect to a tv such as vcrs older video game consoles and home computers 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 sometimes this modulator was built into the product such as video game consoles vcrs or the atari commodore 64 or trs 80 coco home computers and sometimes it was an external unit powered by the computer in the case of the ti 99 4a or some apple modulators or with an independent power supply a because of the digital television transition most tv sets sold these days no longer have analog television tuners and cannot accept a signal from an analog modulator but because composite video has a well established market for both devices that convert it to channel 3 4 outputs as well as devices that convert things like vga to composite it has offered opportunities to repurpose older composite monitors for newer devices demodulation loss edit the process of modulating rf with the original video signal and then demodulating the original signal again in the tv introduces losses including added noise or interference for these reasons it is best to use composite connections instead of rf connections if possible 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 available to translate composite signals for older equipment see also edit list of video connectors ntsc color encoding pal color encoding notes edit in the united states using an external rf modulator frees the manufacturer from obtaining fcc approval for each variation of a device through the early 1980s electronics that output a television channel signal were required to meet the same shielding requirements as broadcast television equipment thus forcing manufacturers such as apple to omit an rf modulator and texas instruments to have their rf modulator as an external unit which they had certified by the fcc without mentioning they were planning to sell it with a computer in europe while most countries used the same broadcast standard there were different modulation standards pal g versus pal i for example and using an external modulator allowed manufacturers to make a single product and easily sell it to different countries by changing the modulator references edit definition composite video computer language retrieved 23 may 2019 the cable bible retrieved 23 may 2019 video basics maxim integrated retrieved 14 july 2018 robert silva 8 november 2017 composite video the basics lifewire retrieved 14 july 2018 understanding video comb filters pdf retrieved 29 may 2020 smpte standard for television composite analog video signal ntsc for studio applications 2004 us patent 4323915 us patent and trademark office archived from the original on 20 december 2016 retrieved 12 may 2014 elwro 800 junior mcbx oldcomputer info archived from the original on 18 march 2017 retrieved 5 may 2018 lc 1 audio cable design notes blue jeans cable archived from the original on 28 november 2011 retrieved 21 january 2012 external links edit maxim apr 17 2001 video basics tutorial covering cvbs format structure marshall brain 26 november 2006 composite video signal retrieved 1 may 2020 v t e analog video standards rf connector composite video s video y c component video ypbpr rgb v t e analog television broadcasting topics systems 180 line 343 line 375 line 405 line system a 441 line 525 line system m 625 line system b system c system d system g system h system i system k system l system n 819 line system e system f color systems ntsc ntsc j clear vision pal pal m pal s palplus secam video back porch and front porch black level blanking level chrominance chrominance subcarrier colorburst color killer color tv composite video frame video horizontal scan rate horizontal blanking interval luma nominal analogue blanking overscan raster scan safe area television lines vertical blanking interval white clipper sound multichannel television sound nicam sound in syncs zweikanalton modulation frequency modulation quadrature amplitude modulation vestigial sideband modulation vsb transmission amplifiers antenna radio broadcast transmitter transmitter station cavity amplifier differential gain differential phase diplexer dipole antenna dummy load frequency mixer intercarrier method intermediate frequency output power of an analog tv transmitter pre emphasis residual carrier split sound system superheterodyne transmitter television receive only direct broadcast satellite television television transmitter terrestrial television transposer digital television transition frequencies bands frequency offset microwave transmission television channel frequencies uhf vhf propagation beam tilt distortion earth bulge field strength in free space noise electronics null fill path loss radiation pattern skew television interference testing distortionmeter field strength meter vectorscope vit signals zero reference pulse artifacts dot crawl ghosting hanover bars sparklies v t e audio and video connectors analog audio banana plug binding post d subminiature euroblock din mini din jack plug rca speaker spring terminal speakon xlr digital audio bnc d sub s pdif toslink xlr video bnc component rgb component ypbpr composite video d terminal db13w3 dfp din mini din dms 59 lfh dvi mini dvi micro dvi rca s video vga mini vga audio and video adc belling lee evc type f hdbaset hdmi displayport mdp mhl supermhl minijack p d pdmi scart visual charts list of video connectors general purpose thunderbolt usb v t e audio and video interfaces and connectors audio only analog interface pc system design guide connectors trs 3 5 mm interface balanced audio connectors trs 6 53 mm xlr digital interface s pdif connectors rca jack coaxial toslink optical bnc interface aes3 aes ebu connectors rca jack xlr toslink optical bnc video only analog interface vga connectors db 15 dvi a interface composite connectors rca jack yellow interface s video connectors mini din 4 pin interface component connectors rca jacks 3 interface composite s video and component connectors vivo using mini din 9 pin digital and analog interface dvi connectors dvi i dvi d video and audio digital interface hdmi connectors hdmi connector interface displayport connectors displayport connector interface hdbaset connectors 8p8c connector retrieved from https en wikipedia org w index php title composite_video oldid 1111473079 categories video signal analog video connectors film and video technology television technology repurposing composite video formats hidden categories articles with short description short description is different from wikidata use dmy dates from august 2020 use american english from march 2020 all wikipedia articles written in american english all articles with unsourced statements articles with unsourced statements from august 2022 navigation menu personal tools not logged in talk contributions create account log in namespaces article talk english views read edit view history more search navigation main page contents current events random article about wikipedia contact us donate contribute help learn to edit community portal recent changes upload file tools what links here related changes upload file special pages permanent link page information cite this page wikidata item print export download as pdf printable version in other projects wikimedia commons languages العربية беларуская български català čeština deutsch eesti español français 한국어 italiano nederlands 日本語 norsk bokmål polski português русский suomi svenska türkçe українська 吴语 中文 edit links this page was last edited on 21 september 2022 at 04 49 utc text is available under the creative commons attribution sharealike license 3 0 additional terms may apply by using this site you agree to the terms of use and privacy policy wikipedia is a registered trademark of the wikimedia foundation inc a non profit organization privacy policy about wikipedia disclaimers contact wikipedia mobile view developers statistics cookie statement