Why is better vga or analog rgb?

Answer 1

VGA IS analog RGB. The two are one and the same. There are some minor differences in the way the signals are handled: VGA uses two separate synchronisation lines, one for horizontal and one for vertical pulses. Broadcast signals tend to use a single sync line or even add the sync signals to the green signal. VGA and its derivatives, SVGA, XGA, SXGA etc may also be generated at a variety of frame and line frequencies rather than broadcast rates.

Other than that, VGA uses 1V signals, terminated into 75 ohm loads at the end of the transmission line in exactly the same way as broadcast standard RGB signals.


The quality of the image produced is dependent on the resolution in use as the picture is generated. VGA is the same resolution as standard definition television, SXGA is similar in resolution to HD images. UXGA is a higher resolution than HD.


Analog RGB is normally carried on three or four separate coax cables. VGA is carried in a single cable and normally the individual conductors are smaller and less robust than separate cables. VGA signals will often be affected by long cable runs while separately cabled RGB signals typically can be carried far greater distances before the signal deteriorates noticeably.


NOTE: for clarification, analog RGB is NOT the same as component signals. Although both use three lines, component is a different format to RGB and the two are not compatible.