Re: Run HDMI from DVD to TV. What about audio?

I understand about the cable change now. Thanks.

Kevin




On Jul 14, 11:13 pm, phil-news-nos...@xxxxxxxx wrote:
On Sat, 14 Jul 2007 20:37:31 -0400 Matthew L. Martin <noth...@xxxxxxxxxxxx> wrote:

| HDMI 1.3 is an update to the HDMI specification. AIUI, it mandates
| higher bandwidth to enable 1080p and deep color (deeper than HDTV
| specs). It also specifies changes in the protocol so that processing
| delay times can be communicated between the source and the display. This
| allows the two devices to attempt to counter the processing time to
| avoid lip sync issues.

The display would be able to do something like tell the player "hey, I am
delaying the video by 851.375 milliseconds, so you should delay audio to
the stereo system by the same amount so the organics won't know I'm so
slow at this".

It would really suck for games, though.

| It's all about the communications. HDMI is a communications standard
| that specifies the electrical characteristics of the cable *AND* the
| protocol use to communicate over the cable. The cable is the medium for
| the communications. Changing the protocol used over the cable requires a
| change to the cable system specification. If there were no electrical
| changes to the cable specifications, I would have called it HDMI 1.2.1,
| but they changed both at the same time, hence HDMI 1.3.

They should have ... from the very beginning ... just used 75 ohm coax for
the connection. They can still encrypt the data stream and do two-way
communications. With multilevel signals, the bandwidth can be quite high.

The audio should have been transmitted with the video, and time tagged.
Then the audio output to stereo systems would be from the display itself,
instead of requiring _every_ source device having to incorporate a delay
mechanism.

Additionally, a multi-device protocol would allow the source to device to
receive multiple display device keys over the same coax, and send multiple
decode keys in the main band signal. Then you can have a multi-room system
on one coax output (of the same program content).

But no ... the cable and connector manufacturers have to come up with yet
a new and more expensive standard.

--
|---------------------------------------/----------------------------------­|
| Phil Howard KA9WGN (ka9wgn.ham.org) / Do not send to the address below |
| first name lower case at ipal.net / spamtrap-2007-07-14-2...@xxxxxxxx |
|------------------------------------/-------------------------------------­|


.

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