Re: picture moevement with HDTV

On Fri, 01 Sep 2006 19:11:17 GMT, AZV14@xxxxxxxxxxxx wrote:

Happy to,,,

SD is Standard Definitition - essentially 480i just like you get from
a DVD.

OTA broadcasters have the option of broadcasting 5 SD channels(480i),
or one HD channel (1080i). When they try to do an HD plus any sub
channels in SD they run out of bandwidth.

HD looks great, as long as its fish slowly swimming in a tank, or a
static image. Rapid motion requires frequent image updates, and when
not enough bandwidth is available you get this annoying (well at least
to me it is), 'breakup" of the picture. Thats not a problem with SD,
plenty of bandwidth available for those channels.

Some network sports use 720P to avoid the breakup problem, but then
the HD truests complain that the pictures isnt sharp enough.

HD has nothing to do with the switch to Digital TV broadcasting BTW.
The digital mandate is for them to switch to digital transmision of SD
signals. The ability to send 5 channels in the place of one being the
economic attraction for the broadcasters - not the HD.



I don't get any "annoying breakup" of my HD picture from Comcast
"Leonard Caillouet" <nospam@xxxxxxxxx> wrote:



<AZV14@xxxxxxxxxxxx> wrote in message
news:44f7cc17.44514515@xxxxxxxxxxxxxxxxxxxx

Its called macro blocking - its caused by there not being enough
bandwidth being allocated by the station, and or, to much compression
of the HD signal.

Its why HD is going to fail,,often the SD picture is much less
annoying to watch.

I am curious why you say SD is less annoying to watch. Do you mean analog
NTSC? Also, how is HD going to "fail"? What will we be watching when it
does? Can you explain your statements? I am sure that there are lots of
others on this group that understand the technology that are as curious as I
am to figure out exactly what you mean and what you know that the rest of us
do not.

Leonard


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