[opendtv] Re: Popular screen aspect ratios

  • From: Albert Manfredi <albert.e.manfredi@xxxxxxxxxx>
  • To: <opendtv@xxxxxxxxxxxxx>
  • Date: Sun, 2 Jan 2011 19:14:57 -0500

Craig Birkmaier wrote:
 
> The decoder DOES know how wide and how high, and how to stuff
> this into a 16:9 output.
 
Are you for real?
 
Yes, Craig, the decoder *would* know *if* something tells it that 16:9 is what 
it's going to. Quit the circular arguments, will you? If your screen happens to 
be 2:1, something has to tell that to the decoder, Craig. Just saying that 
"widescreen" means DTV makes no sense. A specific ratio has to be signaled to 
the decoder.
 
> I have had both 4:3 and 16:9 Digital TVs; for both the cable
> box setting is the same;
 
Well, Craig, then figure out how this can be. Don't assume magic. Don't assume 
that the deocder knows something occurring downstream, unless it is told 
somehow. For insdtance, are you using a digital interface?
 
> Rubbish. The underlying MPEG-2 standard has everything necessary
 
Aren't we lucky you don't actually design anything, then.
 
> The decoder DOES NOT need to know what the screen aspect ratio
> is. it simply needs a known way to present samples to the display
> processor. With a bit of intelligence it would be easy to have the
> decoder and display processor communicate and handle ANY format,
 
Tell that to Cliff.
 
"With a little bit of intelligence," is your leap of faith. First, figure out 
how it wortks. Then, explain it clearly. A display processor that is simply fed 
an analog voltage for the scanning lines, and the same time duration for each 
line, will not have a whole lot to go on, Craig.
 
This is not very difficult to understand.
 
Bert                                       
 
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