Re: MCE 2005 w/ Rollup 2 AND HDTV

ATSC over the air is Encoded so it uses very little bandwidth just like QAM
has encoded HDprograms which also use very little bandidth when compared to
Decoded.
Of course they use a lot more bandwidth then encoded SD programs which can
also be recieved OTA IAW ATSC specs.

"Mike" <Mike@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:720A7492-B57B-4812-936A-836B7AA2218C@xxxxxxxxxxxxxxxx
Thanks - that does make sense to me but it raises another question...
How is ATSC after decoded from a STB any different from the "supported"
ATSC
Over The Air? Wouldn't we run into the same limitations - but MS actually
supports HD OTA...
?

"JW" wrote:

The signal that is broadcast is compressed and encoded in MPEG2 format.
For example if in a particular part of a frame image the same color
comvers
quite a few pixels together then the encoded covers the whole group of
pixels at once. Also every frame is not transmitted. Full frames are
transmitted and then change pixel data is transmitted when there are only
minor changes to the image such as the image of the newscaster on the
evening news.
The decoded video that is sent over component, DVI or other display
interface transmits all of the pixel data for every framw which is why it
requires a much hgher bandwidth.

"Mike" <Mike@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:F0DD6F85-10AC-445A-B395-6532D2732FC3@xxxxxxxxxxxxxxxx
Can you tell me why STB puts out ATSC at such high output Vs OTA ATSC
(which
most pvr's / Pc's / MCE can handle)?
What are the bandwidths limits that people are getting from coax ports
on
common PVR's?
Thanks JW!

"JW" wrote:

QAM is an RF tranmission method used by Cable companies that they use
for
the tranmission of both SD and HD broadcasts.
The ATSC standard has two parts first the RF tranmission method and
secondly
the video resolution formats that are to be used for digital TV.
The cable companies use the same ATSC resolution formats when they
are
using the QAM RF tranmission technology.

There is no way to import decoded HD into a PC from a STB since it
could
require a bandwidth of up to 1.6GB/sec.
Yes your graphics card can be limiting when receiving HD programing
via
an
HDTV tuner card.
Some of the Fusion HDTV tuner cards also have a QAM tuner which can
be
used
to get the Unencrypted QAM channels from your cable, however, when
doing
so
you have to use an applicatrion other than MCE.
Since the unencrypted QAM channels from your cable company are the
same
channels that the HDTV tuner card can probably recieve with a small
antenna
and which can then be handled by MCE there is not much benefit to
using
the
cards QAM tuner.

"Mike" <Mike@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:D1EFE440-A60E-472A-B1F5-BF4AA7FB83B4@xxxxxxxxxxxxxxxx
OK,
Let me understand, QAM comes into my house, QAM gets converted to
both
ATSC
and NTSC after the cable box. Theoretically, if I took the DVI (or
component)out from the cable box, and ran it in to a DVI (or
component)
in
on
my MCE box - we'd have HD to MCE - then if I output Through DVI to
my
TV -
I,
in theory now, have HD on my tv, through MCE.?? (of course knowing
that
my
graphics card or PVR card isn't limiting the ATSC feed)?
So in summary, since I cannot find a PVR Card that supports
component
cables
or DVI, (grrr), (let me know if you know of one), I cannot get HD
out
of
Cable?
-mike

"JW" wrote:

All of the SD cable channel inputs are in NTSC(480i) format both
analog
and
digital. The HD channel inputs are in ATSC resolutions trasmitted
via
QAM
which is not the same as ATSC

There is no requirement that any Cable or Satellites companies
transmit
IAW
ATSC RF standards since they are not tranmitting using an antenna
with
FCC
assigned frequencies.

An NTSC tuner can only receive NTSC standard analog RF
channels(2-99)
which
can come by antenna or by analog cable.

An ATSC tuner can only receive MPEG2 encoded/compressed digital RF
channels.
When your comcast sends output to your TV in Component or DVI/HDMI
it
is
sending decoded/uncompressed HD video and part of the signal using
these
transports tell the TV what resolution it is receiving.

Yes a COAX cable can carry either NTSC or ATSC RF signals but if
the
receiving end tuner will receive they type of signals it is
designed
for
just as a telephone line can transmit any lanquage, however if the
listener
does not understand Russian the talker can not speak Russian and be
understood.

"Mike" <Mike@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:35D20798-B96A-4864-8BD6-08AFBFF33863@xxxxxxxxxxxxxxxx
So I guess the bottom line is, after the comcast box, (through
component
OR
through coax) the format is NOT ATSC (correct?) so Windows XP
Media
Center
Edition will NOT interpret? Is that correct? How does my TV know
that
the
feed is HD then. I thought ATSC was the new digital standard
that
the
US
is
pushing and all should conform.
If that is the case, in what format does Comcast HD come in as
(my
TV
ONLY
tells me that 720p is coming in directly from the comcast box and
NOT
the
format)
I had assumed that the cable box just doesn't have a HD Tuner on
the
coax
out.
But Coax should carry HD (especially in the form of ATSC OTA)
Confused...?

"GBK" wrote:

it outputing 480i thru coax from your comcast box then you have
a
non
HD
card so it only accepts 480i NTSC format. the problem isn't so
much
that
MCE
won't support HD from Cable but more so that the cable
conglamorate
didn't
allow to build cards that can tune HD Cable. MCE can handle HD
(ATSC
format -- over the air only) res etc you just don't have a card
that
will
supply it in that format. There is no cards available that will
let
you
do
this at this point... Microsoft Vista will have the ability to
use
a
new
card that should come out in the same time frame but at this
point
it's
unclear that you will be able to buy it as an addon to your
current
pc..
From what I understand it will only work with Vista and will
only
come
on
"certified" by Cable Labs computers.


"Mike" <Mike@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:4A838030-25BE-4773-BC13-A1F9CDA4A9E3@xxxxxxxxxxxxxxxx
Thanks Roy.
I don't understand why not though... unless the format is
different
for
HD
feeds.
When I choose a HD channel, I do get the feed, but it comes at
480i.
That
tells me that the feed "should" pass through... ??
What does the comcast box / hd tuner directly to the tv do
that
media
center
won't understand?

Thanks

"Roy" wrote:

Mike,
MCE 2K5 only supports Over the Air HD, so the comcast HD
won't
work
though
your Media Center. However, it will work on an HD tuner
connected
directly
to an HD TV.
Hope this helps/

"Mike" wrote:

Hopefully I don't piss off too many people with this
question
(I
did
search a
bit before sending this, however the results that I found
seem
old)

So as of 3.27.06, can I get HDTV (from Comcast - through
their
HD
Conversion
box) passed through MCE 2005, to my TV -(channels changed
using
IR
Blaster).
The biggest problem that I see at this point is losing it
from
the
Comcast
box, going to the PC running MCE. The PC has the Hauppauge
500
with
1
coaxial input, 1 svideo input, and 1 composite input - all
that
"aren't
HD".
Is there a PVR type card that will keep integrity of HD the
HD
feed?
I currently have the Comcast HD box connected to MCE with
Coaxial
cable,
however the Motorolla box (I believe) doesn't support HD
from
the
Comcast /
Motorolla coaxial OUT. ??
This, I believe, is where I am losing HD feed














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Relevant Pages

  • Re: MCE 2005 w/ Rollup 2 AND HDTV
    ... How is ATSC after decoded from a STB any different from the "supported" ... HDTV tuner card. ...
    (microsoft.public.windows.mediacenter)
  • Re: MCE 2005 w/ Rollup 2 AND HDTV
    ... How is ATSC after decoded from a STB any different from the "supported" ... HDTV tuner card. ... Some of the Fusion HDTV tuner cards also have a QAM tuner which can ...
    (microsoft.public.windows.mediacenter)
  • Re: MCE 2005 w/ Rollup 2 AND HDTV
    ... The ATSC standard has two parts first the RF tranmission method and secondly ... using the QAM RF tranmission technology. ... HDTV tuner card. ...
    (microsoft.public.windows.mediacenter)
  • Re: MCE 2005 w/ Rollup 2 AND HDTV
    ... The signal that is broadcast is compressed and encoded in MPEG2 format. ... The cable companies use the same ATSC resolution formats when they are ... HDTV tuner card. ...
    (microsoft.public.windows.mediacenter)
  • Re: MCE 2005 w/ Rollup 2 AND HDTV
    ... Can you tell me why STB puts out ATSC at such high output Vs OTA ATSC (which ... HDTV tuner card. ... you have to use an applicatrion other than MCE. ...
    (microsoft.public.windows.mediacenter)
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