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Guest
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 Posted:
Thu Nov 10, 2005 11:39 pm Post subject:
Does 1080i mean HDTV? |
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I was at Best Buy the other day and I saw a television, CRT, that had
1080i. Does that mean it must be HDTV also? I couldn't find HDTV
anywhere in the description on the sales tag and didn't want to take
the salesperson's word for it (so I didn't ask them).
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Larry Bud
Guest
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| Posted:
Fri Nov 11, 2005 1:04 am Post subject:
Re: Does 1080i mean HDTV? |
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needin4mat...@gmail.com wrote:
| Quote: | I was at Best Buy the other day and I saw a television, CRT, that had
1080i. Does that mean it must be HDTV also? I couldn't find HDTV
anywhere in the description on the sales tag and didn't want to take
the salesperson's word for it (so I didn't ask them).
|
Depends on what you mean by "the CRT had 1080i". If you're talking
about the display, yes, 1080i is one of the HD formats.
But beware of "enhanced definition" TVs that have 480p displays, but
they can accept a 1080i signal. The signal is converted in the TV.
When in doubt, look up the model on the internet. |
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canabana
Guest
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| Posted:
Sat Nov 12, 2005 12:12 am Post subject:
Re: Does 1080i mean HDTV? |
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no it not really not hd. techinally 1080i only shows 540p at a single
time. if you want 1080 lines go with a tv that can display 1080p. |
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Matthew L. Martin
Guest
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| Posted:
Sat Nov 12, 2005 12:20 am Post subject:
Re: Does 1080i mean HDTV? |
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canabana wrote:
| Quote: | no it not really not hd. techinally 1080i only shows 540p at a single
time. if you want 1080 lines go with a tv that can display 1080p.
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This is simply wrong. It is wrong standing in a pool of wrong with more
wrong being poured in.
1080i has 1080 lines displayed in as interlaced lines. On still scenes
it provides 1080 distinct lines on the display. For rapidly moving
scenes it provides ~760 effective lines of image.
By your "reasoning" NTSC is really 240p instead of 480i. That is
completely wrong, as well.
Matthew
--
There had better be horses and ponies in heaven, or the god I
don't believe is going to get her butt kicked big time.
-- TeaLady (mari) on ARK |
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Curmudgeon
Guest
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| Posted:
Sat Nov 12, 2005 12:33 am Post subject:
Re: Does 1080i mean HDTV? |
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canabana wrote:
| Quote: | no it not really not hd. techinally 1080i only shows 540p at a single
time. if you want 1080 lines go with a tv that can display 1080p.
Technically you're full of crap. Unless of course you can blink your |
eyes at 30 fps and see individual frames. Get a life and an education! |
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Richard C.
Guest
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| Posted:
Sat Nov 12, 2005 4:06 am Post subject:
Re: Does 1080i mean HDTV? |
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X-No-archive: yes
"canabana" <lorryd@shaw.ca> wrote in message
news:1131732757.065447.135640@g43g2000cwa.googlegroups.com...
| Quote: | no it not really not hd. techinally 1080i only shows 540p at a single
time. if you want 1080 lines go with a tv that can display 1080p.
==================================== |
1080i is true HD.
720p is true HD. |
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Tony Hwang
Guest
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| Posted:
Sat Nov 12, 2005 4:31 am Post subject:
Re: Does 1080i mean HDTV? |
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Curmudgeon wrote:
| Quote: | canabana wrote:
no it not really not hd. techinally 1080i only shows 540p at a single
time. if you want 1080 lines go with a tv that can display 1080p.
Technically you're full of crap. Unless of course you can blink your
eyes at 30 fps and see individual frames. Get a life and an education!
Hi, |
Sounds like he does not understand what that little letter i means, LOL.
Tony |
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canabana
Guest
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| Posted:
Sat Nov 12, 2005 4:48 am Post subject:
Re: Does 1080i mean HDTV? |
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i was taking about 1080i is interlaced. 720p is progressive. this means
720p will give 720 lines at one time. 1080i will only give 540 lines at
one time. |
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canabana
Guest
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| Posted:
Sat Nov 12, 2005 4:51 am Post subject:
Re: Does 1080i mean HDTV? |
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ok i made a typo. call what it what ever you want. i suck and spelling
, typing, and grammer. |
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canabana
Guest
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| Posted:
Sat Nov 12, 2005 4:51 am Post subject:
Re: Does 1080i mean HDTV? |
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ok i made a typo. call what it what ever you want. i suck and spelling
, typing, and grammer. |
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Dennis Mayer
Guest
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| Posted:
Sat Nov 12, 2005 5:04 am Post subject:
Re: Does 1080i mean HDTV? |
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canabana wrote:
| Quote: |
i was taking about 1080i is interlaced. 720p is progressive. this means
720p will give 720 lines at one time. 1080i will only give 540 lines at
one time.
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For an education point.....
The 720 lines offered 60 times a second are in the same spatial
position.... 720p offers more time wise detail...
The 540 lines offered 60 times a second are not in the same
spatial position... but are staggered/interlaced between
between the previous 540 lines.....
For a static picture, 1080i HD offers more spatial detail.
Both 1080i & 720p carry almost identical amount bits per second. |
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R Sweeney
Guest
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| Posted:
Sat Nov 12, 2005 5:41 am Post subject:
Re: Does 1080i mean HDTV? |
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"canabana" <lorryd@shaw.ca> wrote in message
news:1131732757.065447.135640@g43g2000cwa.googlegroups.com...
| Quote: | no it not really not hd. techinally 1080i only shows 540p at a single
time. if you want 1080 lines go with a tv that can display 1080p.
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no
1080i (when displayed as 1080i and not downconverted to EDTV) is true HD
if fact, the highest broadcast resolution of the US ATSC HDTV standard.
there really are 1080 lines on the screen
540 even lines for 1/60 of a second, and the other 540 odd lines for the
second 1/60th for a total full frame rate of thirty 1080 line frames/sec
720P displays fewer lines progressively without the even/odd subframes but
at a higher frame rate
broadcast and cable HDTV does not deliver enough bandwidth to drive 1080P,
instead the 1080P display frame grabs the first 540 line 1/2 frame, buffers
if, adds the second 540 lines... and then displays that combined 1080 lines
for 1/30 of a second while buffering the next frame - the same frame rate
and resolution that comes in as 1080i
maybe someday, we can have 1080P sourced material available, but it's not
today |
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Guest
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| Posted:
Sat Nov 12, 2005 5:41 am Post subject:
Re: Does 1080i mean HDTV? |
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canabana wrote:
| Quote: | ok i made a typo. call what it what ever you want. i suck and spelling
, typing, and grammer.
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As far as I know, there are no interlaced capture devices being used in
HD. The pickups whether a video camera or a film scanner, does a
progressive capture, plugs it into memory and then reads it out
'interlaced'. Many of the new display units re-'integrate' the
interlaced image by storing up the lines and displaying in progressive.
My Samsung DLP certainly works that way. Since the movies you go see
are captured at 24 frames/sec, it seems to me that 30 frame progressive
should be a satisfactory image.
Glenn Gundlach |
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Jan B
Guest
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| Posted:
Sat Nov 12, 2005 1:37 pm Post subject:
Re: Does 1080i mean HDTV? |
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On 11 Nov 2005 18:43:35 -0800, stratus46@yahoo.com wrote:
| Quote: |
canabana wrote:
ok i made a typo. call what it what ever you want. i suck and spelling
, typing, and grammer.
As far as I know, there are no interlaced capture devices being used in
HD. The pickups whether a video camera or a film scanner, does a
progressive capture, plugs it into memory and then reads it out
'interlaced'.
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What about live TV broadcast in 1080i, like sports?
The important question is if the content is really interlaced (where
the fields origin from different exposures) or is progressive with
half the frame rate and transmitted as sequencial fields.
| Quote: | Many of the new display units re-'integrate' the
interlaced image by storing up the lines and displaying in progressive.
My Samsung DLP certainly works that way. Since the movies you go see
are captured at 24 frames/sec, it seems to me that 30 frame progressive
should be a satisfactory image.
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No, that gives a problem in the time domain.
Better to use either 1080i/24p or 1080i with 60 fields per second in
3:2 sequence. The latter makes it possible for the screen to convert
back to 24p.
Or do it the "european" way by speeding the film 4% to 25frames per
second and transmitt as 1080i/ 50 fields per second (PSF).
For true interlaced sources, the higher spatial resolution in 1080i
comes with the price of lower resolution in time domain.
(And vice versa for 720p.)
On top of that comes the problem natively progressive displays have
with true interlaced material.
/Jan |
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Guest
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| Posted:
Sat Nov 12, 2005 3:23 pm Post subject:
Re: Does 1080i mean HDTV? |
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canabana wrote:
| Quote: | no it not really not hd. techinally 1080i only shows 540p at a single
time. if you want 1080 lines go with a tv that can display 1080p.
With that reasoning, NTSC is not truly television. |
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