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Old 14th December 2004, 06:03 PM   #1
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Location: Terre Haute, IN
Question True Digital Signal, requirements?

Please help me settle an arguemenet. My understanding is that Composite, S-Video, Component Video and RGB are not digital and not capable of delivering a true digital signal if used anywhere in the chain of cables/equipment to your TV.

Is it correct that to view a true digital image/source you must have:

A DVID connection from your Satallite box to your TV and a DVID connection from your DVD player to your TV? And if you have a receiver in-between it must also use DVID connections on both ends?

If possible please post some web links to further clairify this discussion.

Thanks for the help,

Andy
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Old 14th December 2004, 07:13 PM   #2
Schaef is offline Schaef  United States
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Location: Cuyahoga Falls, OH
You are correct, composite, s-video and component are all analog signals. (I'm being general, and assuming consumer market only)

Now if what you mean by "a true digital image/source" you mean pure digital from the media to the television, then yes, you need something like DVI/D or HDMI. Also, just to be comlete, DVI itself is NOT necessarily digital, as analog can be passed on a DVI connector as well.

For some more info on this, you can google for DVI and HDMI, also you can check out Tom's Hardware and look for an article on the DVI connections for video cards. It includes a basic primer on DVI.
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Old 14th December 2004, 10:12 PM   #3
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Thanks for the reply. His arguement is that many TVs/DVDs/Receivers etc sold today are capable of receiving digital signal from the Composite/Component and S-Video cabling. Unfortunately I am unable to find evidence that says these cables are not capable of any digital standard.

He agrees that DVID is digital, but also believes he is watching a true digital signal on his TV enen though part of the video daisy chain is passed through an S-Video cable on the way to his TV.

Thanks again.
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Old 15th December 2004, 06:35 PM   #4
Schaef is offline Schaef  United States
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You are correct, while the cable may be capable of carrying the signal digitally, they aren't used that way. The person may be confused by marketing jargon used to describe the TV and DVD player, but I don't know of a single DVD player or any source that supplies s-video, that uses it digitally. It's not standard. I would ask the friend why they believe its all digital, and what exactly makes them believe this.

Of course, a quick way to show otherwise, would be to hook an oscilloscope up to the signals on his s-video cable, and show that they're not what a digital signal would look like. (two states only, with nothing in between) Assuming, of course you have access to a scope.
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Old 15th December 2004, 10:28 PM   #5
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Thanks, I have a scope, and will prove it to him if he is still hiding behind his stubbornness.
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Old 16th December 2004, 04:12 AM   #6
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Or just let him be....
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