Signal rgb10/18/2023 This is the best quality analogue colour signal that a computer can produce. They have 15 pins and carry the three RGB coloured signals and separate H sync and V sync. The standard VGA (Video Graphics Array) plug has been used to connect computers to monitors for many years. They are convenient as the video and audio are connected through the one plug, reducing the confusion from having to plug in three video cables and two audio cables. Scart connectors are widely used in Europe. This is the type of RGB video signal available from many computers. Most flat screens and projectors will accept RGB, with seperate H and V sync (timing signals), referred to as RGBHV. Where RGB video is commonly used, is when connecting a laptop to your display. However the display you are connecting to also needs to be able to received RGB video – this is not very common. The exception is in Europe, where SCART leads are used for connecting between DVD players, Set top boxes and displays.Ī number of DVD players are capable of delivering RGB video at their output, but you normally have to enable this in the setup menu. They are also know as Péritel, 21-pin EuroSCART, Euroconector, EuroAV and EIA Multiport. The plugs have 21 pins and allow RGB video, S-video and composite video (along with left and right audio). SCART comes from Syndicat des Constructeurs d’ Appareils Radiorécepteurs et Téléviseurs. In many countries, RGB video is not used a lot with domestic equipment. Some RGB video signals combine the sync signal with the green coloured picture and some have separate cables for each, requiring 5 signal paths in total. All these lines and frames need to be kept in time, or in sync, hence these timing signal are called horizontal sync (H) and vertical sync (V). Each frame (still picture) is made up of lots of horizontal lines (525 or 625 lines). We need to appreciate that although a TV picture looks like it is a continuously moving picture, it is actually a series of still pictures (called frames) changing 25 or 30 times a second – and this looks like a continuously moving picture to our eyes. It is the most pure form of analogue colour video signal.Īs well as the three full coloured signals, there also needs to be the timing information to make up picture. These three separate video signals ( Red, Green and Blue) is what is known as RGB video. These coloured images then each go to a separate sensor, generating three separate video signals, one with the red picture information, one with the green picture information, and one with the blue picture information. In a colour video camera, after coming through the lens the signal is split into three different colours (red, green and blue) thr ough prisms. In a black & white video camera the image comes through the lens and onto the sensor which generates a video signal representing the image. In the previous articles we looked at Composite video and S-video. This is the third in a series of articles outlining the different video signals used in home entertainment for connecting VCRs, DVDs, set top boxes, cameras and laptops to TVs and projectors. In this article we look at RGB video signal: what it is, where it is used, what cables to use and the problems with RGB video.
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