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On Tue, 19 Jun 2001 08:55:20 +0800, [EMAIL PROTECTED] wrote:
> Don't get composite and component mixed up.
>
> Composite Video typically uses one RCA, F-Type, or one BNC
> connector at each end of a 75-ohm coaxial cable to transmit
> all the signals required for colour video: luminance (brightness)
> and chrominance (colour). Video colour modulation schemes such as
> NTSC (National Television Standards Committee) and PAL
> (Phase Alternation Line) are examples of composite video.
> Cable TV often includes sound within your cable TV connection.
>
> S-Video uses MiniDin 4-pin connectors at each end of a cable
> that has two small 75-ohm coaxial cable lines running within
> it. S-video keeps the luminance signal (brightness signal)
> and chrominance signal (colour signal) separated. One line
> (or pin) carries the luminance signals, one carries the
> chrominance signals, and the other two lines (or pins) each
> are ground wires. Adding the luminance and chrominance signals
> together produces a composite video signal (above). S-video
> is also known as Separate Video or Y/C video because the
> Y signal (brightness) and C signal (colour) are separated.
> S-video is designed to provide a better quality picture than
> composite video.
>
> Component Video typically uses three RCA connectors or three
> BNC connectors at each end of a cable consisting of three
> separate 75-ohm coaxial cable lines within it. However,
> three individual 75-ohm coaxial cables with the same
> connectors can also be used. Component video separates
> the luminance signal (brightness signal) from the sub-components
> of the chrominance signal (the blue signal and the red signal).
> Notice that blue and red will produce green to achieve a completed
> RGB (red, green, blue) signal. Component video is designed to
> provide a better quality picture than s-video.
>
> RGB Video typically uses four or five RCA or BNC connectors at
> each end of a cable consisting of four or five individual 75-ohm
> coaxial cable lines within it. Again, these can be four or
> five individual 75-ohm coaxial cables. (Compare RGB Video with
> Component Video above, as they are often confused.) RGB video
> typically describes a computer video signal, not a television
> screen signal (which are typically NTSC signals or PAL signals).
> RGB signals are incompatible with NTSC and PAL signals, however
> special adaptors can be purchased to convert between them.
> The first three lines carry the red, green, and blue signals
> (the RGB signals) separately. The other two lines carry the
> horizontal sync and vertical sync (which can be combined into
> one line).
Some of the confusion between composite and component, and what VCRs accept,
can come about (at least in Europe, where SCART is used) in that S-Video,
and RGB can be carried over SCART (although, usually a composite signal is
also passed).
Cheers
Neil
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