[opendtv] Re: --FCC OKs WiFi between TV channels

At 11:18 PM -0700 5/27/04, John Willkie wrote:
>So, then what makes an HDTV set?  Would an analog 4:3 set qualify?

Good question.

1. From the ATSC perspective it must display all ATSC formats.

2. From the CEA perspective it must offer at least 1280 x 720 
resolution (but it does not need to actually reproduce all of the 
source resolution).

3. From a purist perspective it must provide a sharp image over a 30 
degree field of view at 3.3 picture heights.

Clearly a 4:3 NTSC display does not have the ability to do any of these things.

A 4:3 EDTV display (up to 540P resolution) can handle #1, but not #2 or #3.

A 4:3 projector using the TI 1280 x 1024 chips can satisfy all three.

Virtually all CRT based HD displays fall short of #3, and they cheat 
on #2. Any direct view HD CRT display will fall far short of the goal 
in horizontal resolution since the shadow masks have no more than 850 
samples in the horizontal. Any consumer CRT based RPTV will also fall 
far short in the horizontal because of the limitations of the amps 
and the CRTs themselves; these displays typically have the ability to 
resolve no more than 850-1000 samples per line.

The reality is that hardly anyone has an HD display that can deliver 
on #3, which is the basic criteria for the HDTV viewing experience.

Regards
Craig
 
 
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