Video Buses



[Component Video] [Composite Video] [ DVI] [HDMI]
[DisplayPort] [Monitor Buses] [RS-170] [SCART] [SDI] [S-Video]

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Component Video

Component Video is also called YPbPr, or YCbCr and transmits the picture information in a luminance and phase-opposite chrominance pair over three coax cables [Red, Green, and Blue]. RGB [Red, Green, Blue] is some times also called Component Video, but combine the color, black and white signal

YPbPr is 'sometimes' used when discussing the three-wire analog video component interface EIA-770 [EIA-770.2-a SMPTE-240M and others]. The luminance (Y) is represented separately from the color components (Pb and Pr).
In some cases The Y output is provided as a Green jack, the Pb is provided as a Blue jack, and the Pr is provided as a Red jack. The 'Y' signal carries the black and white information, The 'Pb' and 'Pr' signals carry the color difference signals.

YCbCr is used when discussing a digital component interface ITU-601 or ITU-656 digital interfaces (formerly CCIR-601, CCIR-656). Y is Luminance, Cb is Blue Chromanance, and Cr is Red Chromanance. CCIR-601 defines an 8-bit DIGITAL 2's compliment coding for component video

RGB is the component format in which the primary colors (red, green, and blue) are transmitted as three independent components. The color, black and white signals are combined within these three signals. Only using RGB inputs requires separate horizontal and vertical sync inputs. RGB presents a better [TV] signal than the other forms of Component video, S-Video, Composite Video, or RS-170. RGB sends each signal on a separate cable and does not mix the color signals.


Component Video Cable
Component Video Cable

{Video Bus Index}


Composite Video

Single "Yellow" (shielded) RCA jack [75 ohm coax cable], which is not to be confused with the Audio (Red and White) jacks of the newer three cable systems, or just a single black wire in the older systems. It's a composite of the black-and-white information (Y) and the color information (C). Composite Video may also be called VBS [Video, Blanking and Syncs], or CVBS [Color, Video, Blanking, and Sync].
The video signal is on the yellow cable, while the white carries the left audio and the red carries the right audio.
S-Video is better than Composite Video, and Component Video is better than either of them.

 Composite Video Cable
Composite Video Cable

Although the Composite Video interface is still found on Audio-Visual gear as of 2010, you don't want to use it.
The next better video interface is S-Video [below], again the A/V gears needs to have the interface.
Of course if you have no other option than Composite video it is. However these days Composite Video is used a little differently.
The Composite Video interface is used in combination Component Video, as the audio input. Recall that Component Video is video only with no audio input.
So when you use Component Video between devices, you may also be using the white and red cables of Composite video to hold the left and right audio channels.
These days, the HDMI cable is the one you want. But you still need to retain compatibility with your old gear.

{Video Bus Index}


DVI

Digital Visual Interface [DVI] .. standard for high-speed, high-resolution digital displays. Developed by the Digital Display Working Group (DDWG).

Refer to the DVI page for additional info and connector pinout, signal names and a description {This web site}

Digital Video Broadcasting/Digital Audio-Visual Council (DVB/DAVIC), developed by DAVIC [inactive] and DVB and adopted by European Telecommunication Standards Institute (ETSI) and International Telecommunication Union (ITU)

DVI has a number of different types connectors:
DVI-D Digital only connector; 24 pins [modified D style]
DVI-I Digital and Analog [RGB]; 29 pins [modified D style]
DFP Digital only connector

DVI Video Cable
DVI Video Cable

{Video Bus Index}


SCART

SCART: Euro-Audio/video connection system to BS 6552:1984 (EN 50-049). Provides the physical and electrical interconnection between two pieces of audio-visual gear. May also be called "Euro", or "Perri" connector. The SCART connector pinout is shown in the table below

YuShin Electronic co. {SCART Sockets, Angle}

Foxconn {Single/Double Scart Connector, Right angle 42 pos}

SCART and Sound card Connections

Pin Name Description Pin Name Description
1 AOR Audio Out Right 2 AIR Audio In Right
3 AOL Audio Out Left + Mono 4 AGND Audio Ground
5 BGND RGB Blue Ground 6 AIL Audio In Left + Mono
7 B RGB Blue 8 SWTCH Audio, RGB switch,16:9
9 GGND RGB Green Ground 10 CLKOUT Clock Out
11 G RGB Green 12 DATA Data Out
13 RGND RGB Red Ground 14 DATAGND Data Ground
15 R RGB Red / Chrominance 16 BLNK Blanking Signal
17 VGND Composite Video Ground 18 BLNKGND Blanking Signal Ground
19 VOUT Composite Video Out 20 VIN Composite Video In, Luminance
21 SHIELD Chassis Ground, cable Shield - - -
 SCART Cable
SCART Cable

{Video Bus Index}


SDI

Serial digital interface [SDI] standard is based on a 270 Mbps transfer rate, over a single 75 ohm coaxial cable, up to 600 feet. Serial Digital Interface is a digital broadcast television standard providing digital encoding of standard NTSC and PAL formats, with embedded audio. SDI is used in Television stations, cable channels, and professional production Equipment. Refer to the SDI page for more information.

SDI Cable
Serial Digital Interface Cable; 75 Ohm Coax

The coax cable shown above would also work as an analog antenna input as well.
Which would be the Tuner input or Antenna input on your TV.

{Video Bus Index}


S-Video

S-Video [Super-video] sends video signals over a multi-wire cable, dividing the video information into two separate [75 ohm coax or twisted pair cables] signals: one for luminance (Light) 'Y' and one for chrominance (Color) 'C'. Each signal is sent shielded, inclosed in a 4-pin Mini-DIN. S-Video is synonymous with Y/C "Component" video. However Y/C is the correct term, but the term S-Video is widely used to indicate the interface when in fact refers to a VCR tape format.
"S-video is a consumer form of component video used primarily with Hi8 and S-VHS".


S-Video Cable Drawing ..  S-Video Connector Pinout
S-Video Cable and Connector Pinout

Although S-video did work well in the latter days of VHS tape drives,
You really want to at least upgrade to Component Video [above].
Or better yet a digital interface like HDMI.

{Video Bus Index}


DisplayPort: The DisplayPort interface: is listed on its own page.

RS-170 EIA/TIA-170 Electrical Performance Standards - Monochrome Television Studio Facilities. RS170 is now listed on the RS-170 page.

High Definition Multimedia Interface, Refer to the HDMI page.
The High Definition Multimedia Interface HDMI cable supplies both high-definition video and multi-channel, digital audio for consumer Audio Visual [AV] entertainment equipment [HDTV, Amplifiers]. The HDMI interface is all digital, with no analog signals. HDMI is backward compatible with the DVI interface, but without the more advanced upgrades and no audio. Converters for HDMI to DVI cables are being produced. The HDMI cable is 5 meters in length and uses 28 AWG wire.

{Video Bus Index}


Computer Video Monitor Information Pages on this site

DFP [Digital Flat Panel] page for additional info and connector pinout descriptions {This web site}
EVC [Enhanced Video Connector] page for additional info and connector pin-out descriptions {This web site}
EGA [Enhanced Graphics Adapter] page for additional info and connector pin out descriptions {This web site}
XGA [eXtender Graphics Adapter] page for additional info and connector pin-out descriptions {This web site}
VGA [Video Graphics Adapter] page for additional info and connector pin-out descriptions {This web site}
SVGA [Super Video Graphics Adapter] page for additional info and connector pin-out descriptions {This web site}
PC Video Buses {This web site}

ATSC "Advanced Television Systems Committee"; Recommends specifications for Digital TV to the FCC
MPEG.org
SMPTE "Society of Motion Picture and Television Engineers"
VESA With FTP down-loads

Additional:
DTVLink: DTV over IEEE-1394
More TV info.

NTSC [National Television System Committee] is used in US [and Japan]
PAL [Phase Alternation by Line] is used outside the US
.... M-PAL [Phase Alternation by Line] is used outside the US [Brazil]
.... N-PAL [Phase Alternation by Line] is used outside the US
SECAM [Sequential Color with Memory] is used outside the US [France/Russia/Africa]

{Back to Video Bus Index}

Engineering Design Key words: Video Cable Bus, DVI, Electrical Standard, Interface Standard, Specification, Spec, Electrical Interface, Semiconductor IC manufacturers, Physical Interface, Engineering Description, electrical characteristics, PC Video Buses, Monitor interfaces, Component Manufacturers, RS170, NTSC, PAL, National Television System Committee.


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Last Modified 1/25/10
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