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REPORTS

Video connectors for the consumer market Part 2

Video connection

Left picture: FBAS Video input. Right picture: FBAS Video connector.

The Cinch Video FBAS (Color picture scan synchronous) Composite connector is often found on TV/ Video devices. The same can be said about LCD TVs. But the image quality is only moderate since brightness color information and synchronization are first modulated to one frequency and then transmitted together through one line/ cable. In the receiving device, i.e. a TV set, the mixed together information has to be separated again using a filter. Regrettably, this works anything but perfect so the result is a noticeable loss in quality. For example, it unearths unwanted effects such as a color/ brightness flickering at the edges or at fine patterns. This effect is called Cross Color or Cross Luminance.

So the video signal transmission via FBAS Composite is the worst transmission method. If you should use this video input despite the aforementioned shortcomings, make sure to use a video cable high in quality in order to prevent loosing even more image quality.

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S-Video connection

Left picture: S-Video input. Right picture: S-Video connector.

The S-Video Hosiden connector is pretty wide spread in the TV/ Video area. S-Video transmits Y/C (luminance = brightness and chrominance = color information) separately which preserves image quality because there is no need to separate them again by filter afterwards as it is the case with FBAS Composite.

Video, S-Video and audio L/ R connectors are often grouped together.

Notice: Often S-Video is misleadingly called S-VHS. S-VHS is a similar technique recording the brightness signal (Luminance) and color signal C (Chrominance) in S-VHS VCRs separately, but it's not identical to S-Video.

VGA D-Sub connection

Left picture: VGA D-Sub input. Right picture: D-Sub connector.

The 15 pin VGA should be pretty much known to everybody owning a PC monitor. The picture information (RGB and horizontal/ vertical synchronization) is transmitted analogously.

Analog transmission of high frequency video signals through a conductor is subject is rather interference-prone. What adds to that, is the fact that the longer the conductor is, the more the signal quality declines. These factors result in variations or respectively in loss of selectivity of the video signal. Since there is no redundancy this can't be compensated - even with the best of electronics. For this reason one should mind to only use D-Sub cables that are high in quality.

The D-Sub connector is often found on LCD TVs and can be used for connecting a PC.

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