EDIT: What kind of coax does satellite run on?

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Arkitech

Diamond Member
Apr 13, 2000
8,356
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I've been doing some research on HDTVs and related technology and I'm trying to understand all of the terminology. For example I know what 4:3 and 16:9 means but I'm not sure if I really understand what 1080p and 720i indicate. I'm assuming that the p and i stand for progressive and interlaced, but do the numbers mean the lines of resolution? Also what exactly does progressive scan mean or do?

And since we're talking about resolutions, what's the resolution for satellite feeds? digital cable? HD? progressive DVD?

thanks for any input


EDIT: I'm in the process of running coax and cat 5 cable from the first floor in my house to the basement. I'll need approximately about 75 feet, but I'm concerned about signal degradation for the ethernet and video feeds. Whats the longest length of wire I can run for ethernet and coax before I notice a hit in peformance? Also what kind of coax should I use for running satellite signals through a house?


Thanks
 
G

Goosemaster

Lifer
Apr 10, 2001
48,775
3
81
IT'll all about dots....


Widescreen and not use pixel location for a purpose, and that is all on that subject.

When dealing with the NUMBER of dots, or pixels, you get in to resolutions.

Normal definition TVs use a varity of display types, but usually display interlaced pictures. Basically, interlaced refers to the techniqie of scanning every other line for each frame. Basically, half of the image is displayed...for simplicity lets say the odd horizontal lines of pxiels...and then then xest frame shows the others by themselfs.


Progessive formats scan lines sequentially. Basically, there is no "shifting" which can appear as ghosting on many tv's


Bsically, 480i(interlaced) , 480p(progressive), 720...1080....are the vertical resolutions.

DVD's for example can have a resolution of 720x480. Since DVD's use progressive signals, you can express that as 480p.
 
N

NickE

Senior member
Mar 18, 2000
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0
Originally posted by: Goosemaster

Basically, 480i(interlaced) , 480p(progressive), 720...1080....are the horizontal resolutions.
Click to expand...

Vertical - difficult to interlace horizontally :D
 
G

Goosemaster

Lifer
Apr 10, 2001
48,775
3
81
Originally posted by: NickE
Originally posted by: Goosemaster

Basically, 480i(interlaced) , 480p(progressive), 720...1080....are the horizontal resolutions.
Click to expand...

Vertical - difficult to interlace horizontally :D
Click to expand...

Damnnit..it's too early.....I'll change it...
 
V

Viper GTS

Lifer
Oct 13, 1999
38,107
433
136
To expand on Goosemaster's definition of progressive:

A typical interlaced scan cycle might look like this:

(1,3,5,7,9....)
(2,4,6,8,10...)

Whereas progressive would be:

(1,2,3,4,5...)
(1,2,3,4,5...)

On a closely related topic, here's another good article for you:

http://www.dcdi-video.com/technology/articles/sage-dcdi-overview.html

It's an excellent read.

Also, one more thing that might make your investigation of formats easier:

SD and HD pixels are not the same shape. SD pixels aren't square, they're shaped more like this []. That's why the resolutions listed for SD material are not 4:3.

Viper GTS
 
T

Tab

Lifer
Sep 15, 2002
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The reason we still have wasted black space in widescreen TVs is because movie makers only care about the aspect ratio of theaters? Is that correct? Why when I display my computer (Through S-Video) onto a widescreen TV, does it still look like crap?
 
V

Viper GTS

Lifer
Oct 13, 1999
38,107
433
136
Originally posted by: Tabb
The reason we still have wasted black space in widescreen TVs is because movie makers only care about the aspect ratio of theaters? Is that correct? Why when I display my computer (Through S-Video) onto a widescreen TV, does it still look like crap?
Click to expand...

The aspect ratio in a theater is adjustable, there is no standard "wide" format.

Wide simply means anything x:1 where x>1.33.

Remember, theaters are adjustable (the curtains that slide from the top & bottom of the screen), they have wasted space too - You just can't see it.

As far as your s-video out quality, a couple things:

1) Your video card's s-video output sucks
2) s-video really isn't all that good no matter what you do with it

Viper GTS
 
Dulanic

Dulanic

Diamond Member
Oct 27, 2000
9,968
592
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Ya most movies are 1.85:1 which is so close to widescreen which is about 1.75:1 that it shows fine.... why movie makers havent just made movies all be 1.75:1 who knows. And then some movies are even wider like LOTR being 2.35:1 so even on a widescreen TVs you get decent sized black bars. I imagine in the future with HD-DVD well see all movies be the same aspect ratio as widescreen TVs... hopefully atleast.
 
V

Viper GTS

Lifer
Oct 13, 1999
38,107
433
136
Originally posted by: Dulanic
Ya most movies are 1.85:1 which is so close to widescreen which is about 1.75:1 that it shows fine.... why movie makers havent just made movies all be 1.75:1 who knows. And then some movies are even wider like LOTR being 2.35:1 so even on a widescreen TVs you get decent sized black bars. I imagine in the future with HD-DVD well see all movies be the same aspect ratio as widescreen TVs... hopefully atleast.
Click to expand...

Highly, highly unlikely. Directors have always chosen an aspect ratio that they feel suits their film. Any format that doesn't allow for this would never fly.

Traditionally epics (Ben-Hur, LOTR, etc.) have received wider formats (2.35:1), while things like Shrek, Toy Story, etc. tend to get the tallest of the "wide" ratios, 1.78:1.

Viper GTS
 
A

Apex

Diamond Member
Oct 11, 1999
6,511
1
71
www.gotapex.com
One strange thing about DVD's. They're 720x480, but they're in a 16:9 format, thus if you're thinking of it as pixels, the pixels are non-square.

To display DVD's on fixed pixel square pixel devices (for instance an LCD panel), you need at least 854x480 to full resolve that picture.
 
A

Arkitech

Diamond Member
Apr 13, 2000
8,356
4
76
Originally posted by: Pepsi90919
category 5 unshielded twisted pair is designed to run 100 metres if i recall correctly ...
Click to expand...

sweet, I should be covered on that end.
 
M

MercenaryForHire

Lifer
Jan 31, 2002
40,819
2
0
Originally posted by: Arkitech
Originally posted by: KLin
Use RG-6 coax for the satellite cable
Click to expand...

cool

do you know if there are any limitations on length
Click to expand...

300 feet is the theoretical max from "cable box to end device" - so for a satellite setup, you'll be well within that limit. :)

- M4H
 
A

Arkitech

Diamond Member
Apr 13, 2000
8,356
4
76
Originally posted by: MercenaryForHire
Originally posted by: Arkitech
Originally posted by: KLin
Use RG-6 coax for the satellite cable
Click to expand...

cool

do you know if there are any limitations on length
Click to expand...

300 feet is the theoretical max from "cable box to end device" - so for a satellite setup, you'll be well within that limit. :)

- M4H
Click to expand...

thanks, looks like I'm covered
 
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