[mythtv-users] [OT]HDMI, SPDIF, DVI Nvidia, etc

[Calvin Harrigan]

Robert McNamara wrote:
> On Fri, Feb 20, 2009 at 7:09 AM, Calvin Harrigan
> <charriglists at bellsouth.net> wrote:
>> The audio is being sent over the dvi, contrary to popular belief the hdmi
>> didn't introduce audio in addition to the dvi spec.  They are electrically
>> the same.  The audio data is interleaved with the video on the tdms lines.
>>  HDMI really introduced hdcp, yay...
> 
> Still wrong.  DVI supports HDCP.  If you are passing audio via
> DVI->HDMI, it's using a DVI *connector* at one end, but the electrical
> modulation is HDMI format, *not* DVI.  They are *not* electrically the
> same, they are two separate modulations that can use the same
> connectors.  DVI->HDMI which uses audio is HDMI modulation.  HDCP was
> *not* introduced with HDMI, it was already present (and still is
> present) in DVI.
> 
> Robert
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I'm not sure that is the case, my old video card,set top box, dvd player 
knew nothing of hdmi and I was still able to connect via the dvi->hdmi 
cable and get video.
Wikipedia seems to suppport the idea that they are electrically 
similar/compatible.
http://en.wikipedia.org/wiki/Hdmi

************************************************************************
A DVI signal is electrically compatible with an HDMI video signal; no 
signal conversion needs to take place when an adapter is used, and 
consequently no loss in video quality occurs. As such HDMI is backward 
compatible with Digital Visual Interface digital video (DVI-D or DVI-I, 
but not DVI-A) as used on modern computer monitors and graphics cards. 
This means that a DVI-D source can drive an HDMI monitor, or vice versa, 
by means of a suitable adapter or cable.
************************************************************************

Calvin