[opendtv] Re: Gap Fillers Could Be Key Issue in ATSC-MH Deployment
- From: Craig Birkmaier <craig@xxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Tue, 4 Aug 2009 09:54:52 -0400
At 4:06 PM -0700 8/3/09, Ron Economos wrote:
The big problem with 480p is that there is no popular uncompressed
transport for it. Regular SDI doesn't work, and it's not part of HD-SDI.
You either have to use dual SDI, or HD-SDI at 720p with the 480p
image in the upper left hand corner.
The SMPTE created a standard - 294M - for this many years ago,
however, as Ron notes it has not received much market support. 294M
uses either dual 259M (270Mbps) links or a single 259M link that is
clocked at 360 Mbps. I do not know if any of the cheap 259M chips
support the 360Mbps clock rate, but it would be very cost effective
to use 2 standard 259M chips.
The SMPTE 293-M standard defines to format structure around a 720 x
483 raster which would carry the 16:9 format using non-square samples
that would be stretched at the receiver as is the case with wide
screen 480i.
If there are others on the list who might be interested in a HD to
480P down convertor, I would contact David Wood at Ensemble Designs.
Their Bright Eye family of conversion products offer several
solutions for HD to interlaced SD down conversion as well as a
variety of cross convertors. It believe that it would be relatively
easy for David to spin out a unit that outputs 480P according to the
294M spec, and he is always looking for new product niches for his
products.
http://www.ensembledesigns.com/products/brighteye/be92-M
Regards
Craig
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