What's the res of standard TV?

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

On Wed, 21 Sep 2005 12:50:00 -0500, Adam Corolla wrote:

> What is the resolution of a standard TV signal? Are there many non-HDTV or
> EDTV CRT TVs that can display all lines of resolution?

Adam (how's Jimmy?):

Standard NTSC TV is 525 interlaced horizontal lines, of which 480 are
visible. This is the equivalent of vertical resolution. Being analog, the
horizontal resolution is a function of the quality of the medium, and is
usually around 400 or less. An NTSC TV with Component Video has the best
chance of displaying all the resolution, S-Video comes next, followed by
Composite and RF is the worst (200 or so). It really depends on the source,
'cause it aint gonna get much better.

The equivalent ATSC resolution is 640x480 interlaced, which is called SD or
Standard Definition.

Brad H

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

"Brad Houser" <bradDOThouser@intel.com> wrote in message
news:1imohgzqywf63$.1lexnqqadvimp$.dlg@40tude.net...
> On Wed, 21 Sep 2005 12:50:00 -0500, Adam Corolla wrote:
>
>> What is the resolution of a standard TV signal? Are there many non-HDTV
>> or
>> EDTV CRT TVs that can display all lines of resolution?
>
> Adam (how's Jimmy?):
>
> Standard NTSC TV is 525 interlaced horizontal lines, of which 480 are
> visible. This is the equivalent of vertical resolution. Being analog, the
> horizontal resolution is a function of the quality of the medium, and is
> usually around 400 or less. An NTSC TV with Component Video has the best
> chance of displaying all the resolution, S-Video comes next, followed by
> Composite and RF is the worst (200 or so). It really depends on the
> source,
> 'cause it aint gonna get much better.
>
> The equivalent ATSC resolution is 640x480 interlaced, which is called SD
> or
> Standard Definition.
>
> Brad H

Not really!

NTSC that is broadcast in North America is fixed at 60 Hz with a bandwidth
that allows 525 lines of vertical information. Since some of those lines are
often used for non-video display information it is conservatively stated
that vertical resolution is limited to 480 lines. Horizontal resolution from
composite sources such as broadcast sources can reach out to over 400 lines
of display resolution, but NTSC from DVD sources can reach out to over 500
lines of horizontal display resolution. S-video or component video makes no
difference in resolution. S-video was introduced to reduce the artifacts
displayed when a TV set lacks adequate filters to keep the color and black
and white information apart.

Richard.

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

"afiggatt" <afiggatt@adelphia.net> wrote in message
news:G8idnaGvn7ZXUqzeRVn-gA@adelphia.com...
> Adam Corolla wrote:
>> "Brad Houser" <bradDOThouser@intel.com> wrote in message
>> news:1imohgzqywf63$.1lexnqqadvimp$.dlg@40tude.net...
>>
>>>Standard NTSC TV is 525 interlaced horizontal lines, of which 480 are
>>>visible.
>>
>>
>> So, that would be like 480i, compared to 1080i for an HDTV display (not
>> the HDTV signal itself, but a common display)?
>> What's the horizontal resolution of NTSC?
>> Is the HDTV signal 1080i vertical?
>
> 480i is considered SD and the equivalent to NTSC. But 480i digital in the
> ATSC standards can be either 680x480i or 704x480i either of which has
> better true horizontal resolution than analog broadcast NTSC.
>
> The ATSC standard provides for 18 different broadcast signal types from
> 480i to 1080p30. The two that the networks have settled on are 720p = 1280
> x 720p at 60 frames per second (fps) and 1080i = (1920 x 1080i at 60
> interlaced fps. Because it is interlaced, the true update rate for 1080i
> for a complete update of the display is 30 fps.
>
> Fox, ABC, ESPN went with 720p because the 60 fps is better for sports.
> All the other networks/cable outlets - CBS, NBC, PBS, WB, Discovery, HBO,
> and so on - use 1080i.
>
> See http://www.hdtvprimer.com/ISSUES/what_is_ATSC.html for more info.
>
> Alan F
>

Thanks a million!!!