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HDTV CRT at 1080i can this only be 50hz?

Forum Home Theatre : HDTV - HDTV CRT at 1080i can this only be 50hz?

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Pedro   06-10-2004 at 09:58:12 PM

Archived from groups: alt.tv.tech.hdtv (More info?)

 

I just read a web site that says that a HD CRT (1080i) cannot use 100hz and
uses
50hz hence when you compare a HDTV CRT at 50hz to a SDTV CRT at 100hz there
is not a lot of difference

can anybody clarify this to me ?

I have just bought a panasonic TX-76PW200A
and would be interested to see if the above is correct

Regards
Nooby

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Anonymous   06-10-2004 at 11:07:23 PM
- 0 +

Archived from groups: alt.tv.tech.hdtv (More info?)

 

Pedro wrote:

> I just read a web site that says that a HD CRT (1080i) cannot use 100hz and
> uses
> 50hz hence when you compare a HDTV CRT at 50hz to a SDTV CRT at 100hz there
> is not a lot of difference
>
> can anybody clarify this to me ?
>
> I have just bought a panasonic TX-76PW200A
> and would be interested to see if the above is correct
>
> Regards
> Nooby
>
>
>
>

50 Hz is a frame rate based on the electrical
frequency in a country. Some sets double
the frame rate for less display flicker. U.S.
and some other countries use 60 Hz
electricity. SD and 1080i is delivered at 60
fields (half frames) per second (30 frames
per second when viewed), or SDTV is 60 frames
per second when interlaced (60i) SDTV is
converted to 60p (progressive) with digital
displays. Very few displays convert 1080i to
1080p for display, although more such
displays, not CRT models, have been announced.
John

Reply to Anonymous
Anonymous   06-11-2004 at 12:56:06 AM
- 0 +

Archived from groups: alt.tv.tech.hdtv (More info?)

 

"Pedro" <pedro@perth.work> wrote in message
news:newscache$z623zh$i9p$1@talaxian.upnaway.com...
> I just read a web site that says that a HD CRT (1080i) cannot use 100hz
and
> uses
> 50hz hence when you compare a HDTV CRT at 50hz to a SDTV CRT at 100hz
there
> is not a lot of difference

Both are 60Hz in the US. No diff in the vert freq. Perhaps if you posted a
link to the web site, then someone could clear up the confusion you are
having.

Reply to Anonymous
Thomas   06-11-2004 at 08:21:15 AM
- 0 +

Archived from groups: alt.tv.tech.hdtv (More info?)

 

"Pedro" <pedro@perth.work> wrote in message
news:newscache$z623zh$i9p$1@talaxian.upnaway.com...
> I just read a web site that says that a HD CRT (1080i) cannot use 100hz
and
> uses
> 50hz hence when you compare a HDTV CRT at 50hz to a SDTV CRT at 100hz
there
> is not a lot of difference
>

Apples and Oranges - HDTV vs SDTV is a resolution comparison (per frame),
while 50 vs 100hz is basically a "frames per second" comparison.

HDTV at 60hz looks a thousand times better than SDTV would at 100hz.

Tom

Reply to Thomas
Anonymous   06-11-2004 at 11:52:01 AM
- 0 +

Archived from groups: alt.tv.tech.hdtv (More info?)

 

"Pedro" <pedro@perth.work> wrote in message
news:newscache$z623zh$i9p$1@talaxian.upnaway.com...
> I just read a web site that says that a HD CRT (1080i) cannot use 100hz
and
> uses
> 50hz hence when you compare a HDTV CRT at 50hz to a SDTV CRT at 100hz
there
> is not a lot of difference
>
> can anybody clarify this to me ?

As others have posted, in the U.S. everything is based on 60Hz, which is
typically sufficient to avoid obvious flicker, thus U.S. TV sets have never
(to my knowledge) been built with a 120Hz refresh.

In Australia (as in Europe), with 50Hz refresh, flicker is more visible,
hence the doubled 100Hz refresh rate.

I can well imagine that CRT 1080i HDTV displays might not have sufficient
scanning frequency to enable a 100Hz refresh at that resolution. I don't
know how much of a flicker problem this would cause, other than that I don't
see why it would be substantially different in that regard from standard
50Hz TVs.

On the other hand, 1080i HDTV has far greater resolution than standard TV,
so the picture will be much better. But if the 50Hz flicker bothers you on
standard TV, it may well bother you on a 50Hz HDTV also. All I can say is
you'll need to look and decide for yourself (keeping in mind that
sensitivity to flicker depends on brightness and other factors - the
brighter the image and the more it is viewed in peripheral vision, the more
noticeable flicker will be).

> I have just bought a panasonic TX-76PW200A
> and would be interested to see if the above is correct

The literature for this TV (a 30" widescreen direct-view CRT with 1080i and
576p compatibility) claims it has 100Hz refresh:
http://tinyurl.com/2z59p

But details are sparse, and I can't tell whether that's supported in all
display modes.

Reply to Anonymous
Pedro   06-11-2004 at 11:00:30 PM
- 0 +

Archived from groups: alt.tv.tech.hdtv (More info?)

 

thanks matthew

I'll wait til I pick it up and play with it to find out, the spec says 100hz
but I think it does 100hz for standard , 75hz for mid and 50 for high
definition and varies with the different free to air

yes, australia has 50hz and 100hz and a few different definitions
just to confuse the noobies.

Reply to Pedro
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