HDMI: Some thoughts (both informal and expert) on the new connectivity

RAF · 10-18-2007, 01:51 AM

I've recently added another "position paper" to my HT web site and it's entitled, "The Wonderful and Sometimes Confusing World of HDMI Connections" A subtitle might be, "Everything you wanted to know about HDMI but were afraid to ask."

You can view it HERE.

The purpose of this thread is to provide a place to discuss HDMI and, perhaps, some of the things brought out in the article. Feel free to ask or comment on anything related to this topic.

As a bonus, I've made arrangements for my friend, Jano Banks, to stop in from time to time (as his busy schedule permits) to handle the more technical questions that may be posed. Jano is the second name listed on the HDMI patent, so his credentials in this area are beyond reproach. (I've always wanted to travel beyond reproach - I hear that it's quite interesting).

Seriously, this is the place to discuss, share and learn about some of the aspects of HDMI that you may have wondered about. Remember, this is a "glass half full" site (in comparison to "glass half empty" sites) so let's keep things focused.

**HTF Ads**

Jonathan Kaye · 10-18-2007, 09:51 AM

Very interesting read. I'm thinking of getting a 4x1 box to complement my HD satellite receiver, PC and (in the fullness of time) Blu-ray & HD DVD (or dual-format). My question is, are such boxes generally good for passing various refresh rates from PCs? I use Powerstrip on my PC to enable playback of 'NTSC' films on DVD at 48Hz for judder-free picture and correct sound pitch, and don't want to spend money on a box only to find it doesn't work for that sort of setup!

RAF · 10-18-2007, 10:07 AM

Good question, Jonathan. I would think, off the top of my head that you'd probably have a better chance of this occurring (passing through refresh rates) with a more expensive box rather than the bargain solution - but I'm not sure. There has to be a reason (other than greed) for some manufacturers charging more for one product over a similar one.

I will say that your question points out why I think that it is so important to try to get permission to return a product to a vendor at no charge (other than postage, etc.) if it doesn't do the job for you. And don't think I'm just trying to steer you to the the more expensive products. I still advocate starting with the least expensive option and working your way up if something doesn't fit.

Incidentally - when I posted the article last night the HTF was undergoing some scheduled maintenance (I think) so things were running really slow. I intend to try to get Jano Banks (The HDMI guy) on board as soon as we get him set up so that he can answer questions just like the one you just posed. Jano would probably know as well as anyone what signals get through an HDMI path unscathed and which do not. He's a very busy man, but he said he will try to check in from time to time to provide answers to HDMI issues. Just don't expect quick turnaround, especially since I don't speak for him.

Happy Handshaking!

Jonathan Kaye · 10-19-2007, 09:38 AM

Thanks, Robert. I look forward to any additional info Jano can add in due course!

RAF · 10-19-2007, 10:29 AM

You're welcome, Jonathan. We are in the process of setting up an account for Jano as he has given us the go-ahead and I've already alerted him to the fact that there's a question out there that might benefit from his input. Whether he chooses to response individually or in "batch mode" is completely up to him, based on his availability and other commitments.

Incidentally, the general consensus among people whom I've talked to on the question of passing refresh rate information via HDMI seems to be, "it should work" but I'll defer to Jano and, of course, actual experience (that 'try and buy' philosophy.) Sorry I can't be more specific, but the goal here is to provide factual information and not to offer opinion as fact.

Gregory Pauswinski · 10-19-2007, 11:13 AM

That's an excellent and informative article, RAF. Thank you!

Cees Alons · 10-19-2007, 12:50 PM

Great article, RAF! I thought I knew enough about HDMI: I didn't.

Now I need one of those repeaters (working as output switch). Hopefully they can be ordered on the 'net soon.

Cees

Dennis Nicholls · 10-20-2007, 11:14 AM

RAF,

The order of inventor's names on a patent doesn't legally mean anything, so you can drop the "he's second on the list" when talking about Jano. You are either an "inventor" or you are not.

I presume you are discussing US Patent # 7,257,163 assigned to Silicon Image? For those interested, you can download a free .pdf at www.pat2pdf.org . It goes into a great deal of detail.

RAF · 10-20-2007, 11:50 AM

Quote:

Originally Posted by Dennis Nicholls

RAF,

The order of inventor's names on a patent doesn't legally mean anything, so you can drop the "he's second on the list" when talking about Jano. You are either an "inventor" or you are not.

I presume you are discussing US Patent # 7,257,163 assigned to Silicon Image? For those interested, you can download a free .pdf at www.pat2pdf.org . It goes into a great deal of detail.

Dennis,

Thanks for the link to the actual HDMI patent. Very informative. And as to my writing and choice of words - you are reading too much into them or are taking them too literally. My mention of "he's second on the list" was a stylistic approach to saying that Jano knows what he's talking about where HDMI is concerned. I chose not to call him the "inventor" of HDMI because that might imply that he was the sole inventor and it was clearly a team effort. I never meant to imply that there is a legal pecking order in such matters. However, having been involved in several situations throughout my life where there were collaborative efforts I do know for a fact that very often the order in which the participants are listed on a document sometimes pays homage to the amount of their contributions - at least in the eyes of the participants or of the sponsors. So while there may not be any "legal" meaning to the order of the names there is often some significance in the community involved.

Let's all agree on one thing - Jano Banks is an authority on HDMI because he is intimately involved in its creation and development, O.K.? That's the point I was trying to get across and I assume that most people understood that without trying to read too much into the way I choose to write.

(I hope these remarks don't come across too harshly because they are intended to clarify, not to get confrontational. I like to think of the HTF as a "glass half full forum" unlike some other venues.)

Dennis Nicholls · 10-20-2007, 12:08 PM

Sorry RAF...I'm a patent attorney and my mind goes into "legalese parse mode" whenever people start talking about patents.

RAF · 10-20-2007, 04:29 PM

Quote:

Originally Posted by Dennis Nicholls

Sorry RAF...I'm a patent attorney and my mind goes into "legalese parse mode" whenever people start talking about patents.

Aha! I did not know that so I fully understand why my remarks may have struck a nerve with you based on your profession. I think you realize that I didn't mean to elevate Jano's position on the HDMI hierarchy with my "2nd on the patent" reference, but was just trying to get my point across as to his qualifications. My choice of words was probably not the best under those circumstances. I think we can agree that Jano qualifies as an expert witness in HDMI matters and I look forward to even a limited participation by him in this thread should the occasion warrant (and his schedule permits).