[opendtv] Re: Defining Visions: They've Done It To Us Again. . .???!!!

I know that 1080P24 is in the HDMI spec, the problem is that it isn't
implemented in the vast majority of HDMI displays being sold.  1080P24
is allowed in ATSC also, but nobody's going to broadcast it to an
installed base of displays only wired for interlaced 1080i input.*

8-channel uncompressed 96kHz/24-bit Audio over Firewire and USB2 are out
there, but aren't likely to become a ubiquitous consumer electronics
interconnect.

The best solution is a single HDMI hose with both audio and video.
Things with HDMI connectors plug together and work, just like the good
old days of ch3/4 over an RF cable.  Only, a display that supports
uncompressed audio and video will survive the next five generations of
settop boxes, modulation standards, codecs, transport streams/protocols,
encryption, etc.

The HDMI problem is whether a display should have several HDMI inputs
for several A/V sources, and a switched audio-only HDMI output to a
multichannel audio amp, or should A/V sources send HDMI to mostly
non-existent A/V "receivers" that select source, split the audio and
video, and send the video to the display via HDMI.  It's easiest to
start with Plan A, but it's best to evolve to Plan B.

It is tempting to consider converter boxes that take HDMI protected
content in and output unprotected YPrPb, but I'd check the DMCA and
robustness rules HDMI implementers must live or die by before investing
the nest egg in such a product or company. =20

*This really sucks for Europe because 24Hz content (movies and most HD
compelling TV other than sports) can't just be speed shifted to 25Hz as
it can for analog ... at least with externally decoded audio.
Resampling and reclocking audio for a 4% speed shift over a digital wire
hurts quality, cost MIPS, Euros, and latency.  Unless HD Euro-displays
support 24Hz as well as 50Hz and 60Hz (they support 50&60Hz already,
with HDMI or HDCP/DVI), they will be stuck with interlace and 3:2
pulldown at 60Hz on their progressive flat panels.  An all HDMI
uncompressed audio ecosystem could run 4% fast just by clocking both
audio and video decoders in the source fast and allowing typical
tolerance for PCM on the audio D/As ... but it would be a good time to
kill the speed shift hack and just enable the 24Hz HDMI EDID on
displays.

Kilroy Hughes

-----Original Message-----
From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx]
On Behalf Of Ron Economos
Sent: Tuesday, August 23, 2005 19:07
To: opendtv@xxxxxxxxxxxxx
Subject: [opendtv] Re: Defining Visions: They've Done It To Us Again. .
.???!!!

HDMI supports 1080@24p. Refer to EIA-CEA-861B for all the
video formats that HDMI can transport. A couple of Sony hi-end
digital projectors will accept the 1080@24sF variant.

IEEE1394 can deliver 8 channels of uncompressed audio with
content protection. In fact, it's the only digital interface currently
allowed for SACD. Installed base is not huge, but it's on pretty
much all Japanese hi-end receivers and DVD players.

Ron

Kilroy Hughes wrote:

>Boy; that one snuck up on us like a garbage truck with no muffler.

 
 
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