Archived from groups: alt.video.ptv.replaytv (
More info?)
On Wed, 06 Jul 2005 11:11:29 GMT, John in Detroit
<Blanked@sbcglobal.net> wrote:
>Mark Lloyd wrote:
>
>> There is always some loss when information is converted from one code
>> to another. The loss can be minimal.
>
>Absolutely. The big "Advantages" (note the quotes) of digital over
>analog are this
>
>1: Consistency... Back in days of old, if you were to watch and record a
>move, using analog, here in Michigan, Then go to say, Texas or Florida
>and watch and record the exact same movie (or if it is a network
>broadcast have a friend record it in one of those two states) and then
>play the two recordings on calibrated gear (Calibrated in this case
>means they are set to show the exact same thing given the exact same
>input) you might be surprised to find that usually everybody had a much
>nicer tan in the "Southern" films
>
>This is because the engineers in the broadcast studio messed up the
>signal at one or the other (or more likely both) transmitting stations
>
>With digital they are not supposed to be doing this
>
True. The digital systems have standards for things such as color.
Analog (NTSC) lacks such a standard, leading to numerous color
inconsistancies.
>Also, with analog every repeater in the link introduces distortion and
>loss So if a network broadcast is sent from New York to Say, Nebraska,
>via land line, it will go through many repeaters and the signal that
>arrives in Nebraska is not, exactly, what left NY. (though it's likely
>very close)
>
>With digital what arrives at the transmitting station, heck, what
>arrives at your house, is EXACTLY what left the originating studio
>
What's actually received will have the same losses an with an analog
signal. However, the use of descrete levels (that's what digital is)
allows the equiptment at the receiving location to re-create the
original signal.
As I've siad before, this is very similar to the superiority of FM
over AM. Both add noise to the signal, but an FM receiver can clean it
up.
>That said I've seen evidence (pixelation) that suggests that even the
>analog broadcasts my TVs pick up were transmitted digitally from the
>"Network" to the broadcast site now days on some stations
Yes, and all TV signals will be in analog form at some point.
--
Mark Lloyd
has a Replay 5xxx
http
/notstupid.laughingsquid.com
"The idea that there is an invisible being who
created and still runs this old universe is so
childish, so obviously contrived, that it is hard to
believe anyone with even a modicum of education can
still fall for that scam."
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