[opendtv] Re: ATSC-SD vs. NTSC
- From: dan.grimes@xxxxxxxx
- To: opendtv@xxxxxxxxxxxxx
- Date: Thu, 27 Oct 2005 11:08:20 -0700
Some of the stations are sending bands on each side of the SD, while others
are using the whole area (this makes for a constant need to adjust aspect
ratio). So clearly not all the bits are used for picture, although the
black bars cannot take too many bits. Others have multiple feeds. All
have some HD programming, so I don't think they are encoding an analog STL.
Any way to find out their bit rate without special equipment?
Dan Grimes
Doug McDonald
<mcdonald@xxxxxxx To: opendtv@xxxxxxxxxxxxx
c.edu> cc:
Sent by: Subject: [opendtv] Re: ATSC-SD
vs. NTSC
opendtv-bounce@fr
eelists.org
10/27/2005 10:44
AM
Please respond to
opendtv
dan.grimes@xxxxxxxx wrote:
>
> Now on the HD side, while similar problems are seen, at least the added
> detail help improve the picture over NTSC. But I don't understand why
> digital SD does not look better.
Because the providers are:
1) using bad encoders
AND/OR
2) having their encoders set wrong
AND/OR
3) using less than say 6 Mb/sec
AND/OR
4) running a crappy analog feed into the encoders
You might not realize that some folks have digital plants,
then send an analog NTSC over their STLs, and then encode
a low-grade monitor NTSC output for their digital channel.
We have a local station that transmits two SD pictures
on their digital channel (CBS and UPN) and both look
just fine. Of course, they are having cable providers use
those feeds instead of their Ch. 3 analog, so they care.
Doug McDonald
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