[opendtv] Re: Popular screen aspect ratios

  • From: Albert Manfredi <albert.e.manfredi@xxxxxxxxxx>
  • To: <opendtv@xxxxxxxxxxxxx>
  • Date: Thu, 23 Dec 2010 18:27:53 -0500

Craig Birkmaier wrote:
 
> As with ANY digital compression algorithm, it is possible to use
> anamorphic squeezes to conserve emission bandwidth.
 
As of today, anamorphic squeeze for TV is defined as a squeeze of 16:9 material 
into a 4:3 frame (by convention, anyway). Squeezing 21:9 material into that 
same 4:3 frame would result in all existing sets showing tall, skinny people, 
when receiving the 21:9 transmissions. It would require a separate broadcast 
stream or a separate BluRay or DVD to do this, or STBs and disc players 
designed to unsqueeze correctly both 16:9 and 21:9 aspect ratios.
 
If, back in the 1990s, a 2:1 aspect ratio had been established for DTV, instead 
of the 16:9 ratio that was set (in spite of FCC inaction), then the anamorphic 
squeeze would have been standardized as 2:1 into the 4:3 frame. And  if that 
had been the case, Jeroen's super wide TV would have been a little better off 
today.
 
Instead of achieving 807 or so effective lines of vertical resolution 
(1.77/2.37 * 1080 = 806.6), as he is doing now on 1080p material, he'd be 
getting 911 lines vertical. Not bad.
 
Bert
                                           
 
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