[opendtv] Re: Why Europe should choose 720P for HDTV

  • From: Doug McDonald <mcdonald@xxxxxxxxxxxx>
  • To: opendtv@xxxxxxxxxxxxx
  • Date: Sat, 11 Dec 2004 09:39:20 -0600

Mark Schubin wrote:

> Consider this.  Which has more resolution?  A 440-line NTSC broadcast or 
> an 852-pixel-wide plasma panel?  Due to the pixel-shift phenomenon, the 
> 852-pixel display can only display half as many TV lines of resolution 
> as pixels with a guarantee that they will be actually black and white. 
>  That's 426, slightly less than broadcast NTSC resolution.
> I think that's what John Watkinson was driving at.

Your 440 line NTSC "broadcast" has a different but equally
severe problem: if it really did have a full 100% flat
baddpass out to some cutoff, it would have a "boxcar"
apodization, and in the electrical domain a pure sin(t)
impulse response (assuming it is phase corrected somewhow).
It would have horrendous ringing, and in fact nonlinearities
because in the light domain things are not linear, and
less than zero light does not exist.

My point ... which is clear if you watch Fox enough
on a true 720p display ... is that true 720p produced
material clearly IS better than even the best 480 material
converted to 720p by Fox using really really good
conversion equipment. The original quoted material
is wrong abot 480 being "just fine" on a 720 display.
In fact it is inferior, if still quite nice.

Has the original quoted person actually looked a
lot at such real stuff? I am implying real stuff
here, including Monday Night Football and the
best Fox Sunday football, as well as the Fox

Doug McDonald

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