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GREG BUGGY
Guest
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 Posted:
Thu Nov 10, 2005 11:40 pm Post subject:
what about edtv |
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I have read some info on EDTV vs HDTV,what I want to know is what tv's being
sold have EDTV. Lookiand around I never see any with EDTV.
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Guest
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| Posted:
Fri Nov 11, 2005 1:21 am Post subject:
Re: what about edtv |
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On Thu, 10 Nov 2005 17:40:37 GMT GREG BUGGY <gbuggy@verizon.net> wrote:
| I have read some info on EDTV vs HDTV,what I want to know is what tv's being
| sold have EDTV. Lookiand around I never see any with EDTV.
If a TV supports ATSC, it supports EDTV in some fashion (capable of receiving
the content and displaying it the best it can). If the display can scan at
your EDTV frame rate, then surely the engineers would not be so dumb as to
not allow this to be displayed as is (such as 480p59.94).
I wonder if they refer to 720p24 as ED or HD ... probably HD, even if the
frame rate is low.
--
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| Phil Howard KA9WGN | http://linuxhomepage.com/ http://ham.org/ |
| (first name) at ipal.net | http://phil.ipal.org/ http://ka9wgn.ham.org/ |
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Dennis Mayer
Guest
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| Posted:
Fri Nov 11, 2005 4:20 am Post subject:
Re: what about edtv |
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GREG BUGGY wrote:
| Quote: |
I have read some info on EDTV vs HDTV,what I want to know is what tv's being
sold have EDTV. Lookiand around I never see any with EDTV.
|
EDTV = 480p wide 16:9
HDTV = 720p wide 16:9 or
1080i wide 16:9 |
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Matthew Vaughan
Guest
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| Posted:
Fri Nov 11, 2005 5:42 am Post subject:
Re: what about edtv |
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"GREG BUGGY" <gbuggy@verizon.net> wrote in message
news:pCLcf.2086$PZ6.1711@trndny07...
| Quote: | I have read some info on EDTV vs HDTV,what I want to know is what tv's
being
sold have EDTV. Lookiand around I never see any with EDTV.
|
The cheaper plasma displays (primiarily in the smaller sizes, such as 42")
are frequently ED (or non-HD). They have a resolution of about 854x480. If
you see a cheap 42" plasma that is not specifically listed as HD, it is
quite probably ED.
From a distance you might not even know it's not HD - ED plasmas can really
jump out at you as looking "great" compared to normal TV until you're
standing right up in front of them. From a few feet away or less, the lack
of HD detail, smoothness, sharpness, etc. becomes pretty clear, though
(assuming the store is feeding a true HD source to the HD sets).
You don't generally see ED resolutions in much of anything besides plasma.
For LCD, it's not really much cheaper to make a display ED as opposed to
HD - it seems to be the size that matters more than the resolution as far as
price is concerned. (Some very small LCDs may be lower resolution, though.)
Various digital rear projectors, such as DLP, LCD, and LCDoS/DILA, are
similar in this regard.
CRTs are also not significantly cheaper to make as 480p than as 1080i since
both use similar scanning frequencies. (720p would be more expensive,
though, let alone 1080p.) |
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canabana
Guest
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| Posted:
Sat Nov 12, 2005 5:01 am Post subject:
Re: what about edtv |
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| edtv basically has only 2 formats 480i and 480p. hdtv is 720p and 1080i. |
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Matthew Vaughan
Guest
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| Posted:
Sun Nov 13, 2005 5:42 am Post subject:
Re: what about edtv |
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"canabana" <lorryd@shaw.ca> wrote in message
news:1131749096.929474.161580@g47g2000cwa.googlegroups.com...
| Quote: | edtv basically has only 2 formats 480i and 480p. hdtv is 720p and 1080i.
|
Congratulations. You know just enough to confuse people. (Not to mention
yourself.)
While there is no formal ATSC specification called "EDTV", it is commonly
used to refer to widescreen 480-line devices - that is, about 854 wide -
capable of displaying 60 progressive frames per second (again, almost always
plasma displays). They are not HD, but they are also not really SD (standard
definition), which is generally taken to be NTSC, or 4:3 480i. (Although
technically a 480x704, or sometimes 720, 60fps progressive scan signal,
which may be in 16:9 format, falls under the "SD" category, so one could
lump ED in this category as well; I prefer to consider it a separate,
intermediate category.)
ED devices can look good for any form of SD, particularly widescreen DVDs
and SD DTV broadcasts, since they match the 480 lines inherent in those
signals, can display a DVD (or a progressive-scan DTV signal) with proper
progressive scan, and are widescreen, so can display 16:9 without wasting
screen space. They can also look quite good for HD broadcasts compared to a
regular NTSC television, since they are widescreen and can display the
signal as progressive scan, giving better motion representation and higher
effective vertical resolution during motion. (In addition, they can display
a larger portion of the HD image than most people believe, since they can
show the color component of the signal at or near its full resolution; where
they lose out is in the higher-detail greyscale, or luminance, portion of
the image.) |
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