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On Wed, Jul 25, 2012 at 2:10 PM, webmaster-Kracked_P_P
<webmaster@krackedpress.com> wrote:
On 07/24/2012 09:43 PM, Brian Barker wrote:

At 09:16 24/07/2012 -0400, Tim Lungstrom wrote:

Also the "lag time" for satellite can be up to 15 seconds from ground
station through a satellite to the ground station.


Oh dear: the speed of light must have decreased by a factor of 63 since I
was at school!  Has someone told the scientific community?

(The delay on the double journey to and from a geostationary satellite is
about a quarter of a second.)

Brian Barker


The lag time is due to the equipment, not the "travel time".

I have both standard and digital cable boxes in my place.  If I have both
TVs on the same channel, the digital TV has a 2 second lag for audio and
video than the non-digital TV's box.  That is do to the time it takes to
convert the TV channel to the digital system and then the conversion back to
the coax cable going into the digital TV's coax input.  Just in that simple
case, there is a lag due to the equipment involved.

As for the time lag I gave you, that is the lag time given in my course in
telecommunication and communication networking.  The problem is the
equipment's lag time doing the processing of the signal to be transmitted
and then the process of converting the signal back to the original format.



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There are digital filters and delay's which 'could/should?' be added
to these devices to compensate for the lag-time of one signal.

It's similar to what they use in very large Audio PA systems when
having very long cable runs.


I even notice it when I go to my doctors, the surround speakers have a
few hundred ms delay over the TV speakers which is quite disturbing.


The mathematics involved however to 'auto-sense' something like that
however is quite complex so even on YouTube videos for Sports like
NASCAR et el.... I have to always adjust the speach delay manually in
mplayer as it fluctuates.


It is quite an interesting scientific phenomenon though, signal
delay/lag and propagation through different mediums.

Regards,

Kaya

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