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Topic:
Component video to S-Video adapter
This thread has 4 replies. Displaying all posts.
Post 1 made on Monday March 20, 2006 at 16:11
hiker
Long Time Member
Joined:
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January 2005
440
I have been looking for a simple adapter to convert a 480i component YPbPr signal to a 480i composite or S-Video signal. No other formats are involved, just 480i.

Searching around I found a InFocus Adapter here. I'm not sure if this will work with standard S-Video 4 pin mini Din connector as the description for this product specifies a 7 pin mini Din. Not sure when a 4 pin or 7 pin is used but my equipment I believe uses 4 pin.

Can someone recommend an adapter?
Post 2 made on Wednesday March 22, 2006 at 18:15
automan1
Founding Member
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April 2002
393
There are no simple adaptors that can convert component to composite.

The infocus adaptor is simply a pin adaptor for infocus projectors, it's not an NTSC encoder, which is what you need.
Post 3 made on Friday April 21, 2006 at 23:16
tweeterguy
Loyal Member
Joined:
Posts:
June 2005
7,708
Simple as in cheap and inexpensive? No.

Can it be done? Absolutely. Many downconverters exist out there for pro video applications. Contact a local a/v company that specializes in pro/commercial applications, not places like radio shack or best buy.
Post 4 made on Saturday May 20, 2006 at 23:09
Ernie Bornn-Gilman
Yes, That Ernie!
Joined:
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December 2001
29,327
On March 20, 2006 at 16:11, hiker said...
I have been looking for a simple adapter to convert
a 480i component YPbPr signal to a 480i composite
or S-Video signal. No other formats are involved,
just 480i.

Composite is a black and white signal with sync, plus the color information modulated on top of it at 4.58 mHz.

If I understand correctly, an oversimplification (which means this task is harder than it looks) is that Analog Component video is
(Y) the instantaneous green signal level plus the sync signals;
(Pb) a signal that is the instantaneous blue signal level minus the instantaneous green level; and
(Pr) the instantaneous red level minus the instantaneous green level.
These signals are processed to extract the green, blue, and red signals.

To begin with, that color information in a composite video signal is a combination of all three colors. That just does not exist anywhere in the component signal.

No, there's no simple way to do what you ask.

Since there is no simple way to change a signal from component to composite, maybe you should back up one step.

Why do you want to do this? What are you trying to accomplish? What components are involved? Model numbers and such will sometimes suggest answers to some of us much better than the generic question.
A good answer is easier with a clear question giving the make and model of everything.
"The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
Post 5 made on Monday May 22, 2006 at 13:53
steveTO
Founding Member
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Posts:
January 2002
93
"color information modulated on top of it at 4.58 mHz."

Two colour difference signals are used to phase modulate a 3.58 MHz subcarrier, not a 4.58 milli Hert subcarrier (please review SI units)

"If I understand correctly, "

You don't, you should have looked it up and copied and pasted, instead of the really bad explanation you posted.

"(Y) the instantaneous green signal level plus the sync signals; "

No, "Y" is the weighted sum of R, G and B, it is the luminence signal, and contians horizontal and vertical sync.

"(Pb) a signal that is the instantaneous blue signal level minus the instantaneous green level; and"

Pb is B-Y, which is equvalent to B - (R + G + B) = R + G (yellow)
Pr is R-Y, which is equivalent to R - (R + G + B) = G + B (cyan)

You need to get from thes baseband colour difference signals to a quadrature phase modulated subcarrier...a simple adaptor won't do this.


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