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8790's HDTV support is very poor - Page 2

post #21 of 23
6/2/04 at 8:40pm
From what I understand the S-Video port is a 4 pin port but serves two modes. In S-Video mode the pins are configured Luminance/Luminance-Ground/Chrominance/Chrominance-Ground, just like a regular video port. In YPrPb mode the four pins are configured (not in order): Luminance, Pr, Pb, Ground. This is a novel solution that saves 2 out of the 6 wires used in the three pairs of coaxial cables usually associated with Component video. (Since the 6 wire configuration uses 3 different grounds) As you probably guessed this configuration makes it impossible to use S-Video and Component video at the same time.
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post #22 of 23
6/2/04 at 9:09pm
You got it. Forgot to mention this in my post. The 6 wires in RGB component transmission only 3 carry the signal, the other three are redundant grounds. Just as in audio for two channel stereo you require 4 wires with composite RCA cables, 2 for signal and 2 for ground. But as anyone knows who uses a headphone jack knows there are only 3 connections on the headphone plug. Two signal connections, and a single shared ground connection. This is how the S video port works too.


Regards,
Sean


Quote:
Originally Posted by deltawalkerl
From what I understand the S-Video port is a 4 pin port but serves two modes. In S-Video mode the pins are configured Luminance/Luminance-Ground/Chrominance/Chrominance-Ground, just like a regular video port. In YPrPb mode the four pins are configured (not in order): Luminance, Pr, Pb, Ground. This is a novel solution that saves 2 out of the 6 wires used in the three pairs of coaxial cables usually associated with Component video. (Since the 6 wire configuration uses 3 different grounds) As you probably guessed this configuration makes it impossible to use S-Video and Component video at the same time.
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post #23 of 23
6/3/04 at 1:43am
Deltawalker,

Thanks for the answer. That's why I love these forums. Always learning something new.

-Photonic
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