RGB signal

from Wikipedia, the free encyclopedia

The RGB signal is a standard for the transmission of color video signals .

The three basic colors red, green and blue are each transmitted or stored in a separate channel .

Scart cable for analog RGB signal transmission
Pin assignment Scart: outside view socket, inside view plug, colors of the strand insulation

RGB signals are transmitted, for example, in computers via the VGA connection or in video technology via the SCART connection or BNC connections . In Asia there is an alternative form of the Scart cable called JP-21, which can also transmit RGB signals, but is not compatible with Scart due to a different arrangement of the pins.

The three-channel RGB signal is usually not used for wireless transmission of images, as it is easier to transmit a signal from just one or two channels. At the same time a synchronization signal has to be transmitted. While this sync signal is already integrated in the chroma information in composite video, or above the luminance (Y / C) in component video and S-video, there are three major types of sync for RGB.

The most common types are “Sync on Composite” and “Composite Sync”. With Sync on Composite, the display device receives the sync signal via the Scart pin, which transmits composite video. Composite sync means that a separate sync signal is transmitted via a separate pin on the Scarts connection.

When transmitting VGA, separate sync is usually used, which uses two separate pins for horizontal and vertical sync.

BNC cables are able to use both composite sync and separate sync.

Analog RGBHV connectors like BNC used to be found only on professional equipment. Now they are partly displaced by YPbPr - Component Video , as this can transmit the YCbCr -coded image data that arise with MPEG -based digital video formats without prior conversion. The conversion is shifted to the camera (with an RGB-based CCD or CMOS chip) and to the RGB-based output devices .

Web links