There are a number of sources for the delay.
When I worked for a TV station, it was almost impossible to cleanly
cut from network to local.
Network had time embedded in their signal that was constantly decoded
by the station and displayed in master control.
The offset from local time varied, slightly, due to the digital
encoding delays based on content.
There was the satellite delay.
Then there was the station decoding delay from network.
Then there was the encoding delay from the TV station that was
variable based on content.
Then there was the decoding delay at the consumer TV.
We received cue tones from network to help minimize the uncertainty
of the network to local transition.
This is part of the reason that you can see the start or end of a
network commercial or promo that is replaced by a local commercial or promo.
I do not think that you will be able to correct or compensate
correctly for the difference in network displayed time and true local time.
Just a little incite into some of the delays and variables involved.
73
Glenn
WB4UIV
ex CE WCIV TV
At 10:37 AM 1/1/2014, you wrote:
From: Hal Murray
Maybe next year we should see how much delay data we can collect. That's in
addition or instead of collecting leap second data. The usual ball drops at
local midnight so you have the time-zone offset to separate collecting
leap-second data and midnight-TV delay data.
=============================
Although I've not checked it accurately, the timing clock on
Formula-1 races seem pretty accurate. and I've seen delays of
between 8 and 10 seconds when watching on Sky TV (satellite). That
may also provide some useful data points without having to wait 365
days! Any other sources of accurate data? I note that since
"digital", we no longer get a station clock at least on the channels
I watch - and program start times are notoriously variable!
David
--
SatSignal Software - Quality software written to your requirements
Web: http://www.satsignal.eu
Email: [email protected]
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