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The check box immediately below that lets you choose whether MetaCast 2 should automatically adjust
for DST or not. Normally you should check this box, even if your region does not observe DST. When
the box is checked, the DST time controls below become available, allowing you to configure when
MetaCast 2 will automatically adjust for DST. By default, the dates are taken from Windows' Time
Zone database but you can adjust them to any time you wish.
If you are feeding Local Time to the 8084AD's LTC reader, it is important that both
MetaCast 2 and your house clock are configured to switch to DST at the same
time, otherwise inaccuracies could occur.
The Daylight Saving Time in Effect check box on the Clock page will now be updated automatically
based on the rules you have chosen. If you do not observe DST in your region then the comment '(Not
observed in this region)' will be added.
If you do not check the Automatic DST Adjustment box then you will have to
manually determine when DST is in effect or not. If you do not set the DST in
Effect check box correctly, incorrect time settings may result on Televisions and
VCR's that are receiving the XDS packets.
B.5.7 Synchronizing Clocks
Once your clocks have been set, the final task is to ensure that everything remains synchronized. You
can resync MetaCast 2 to your Encoder by clicking 'Resync MetaCast and Encoder' button on the
Clock toolbar. MetaCast 2 will also automatically resynchronize to the Encoder time periodically
according to your settings on the General Options page. The 'Set PC clock' check box on this screen
instructs MetaCast 2 to set the PC clock in addition to its internal BroadCast time. This allows additional
instances of MetaCast 2 running on the PC to be synced to one 8084AD Encoder with an LTC reader.
Note: Set PC requires admin privileges on NT4, WIN 2000 and WINXP.
B.5.8 Configuring the 8084AD to Encode Time of Day and Time Zone XDS Packets
The bottom two buttons on the Clocks page allow you to control whether Time of Day/Date and Time
Zone packets are being encoded. If the buttons are pressed then the associated packet is being
encoded and should appear on the Encoder Status page. Normally both buttons should be depressed.
However, if you are in a region that broadcasts to two different time zones you should not transmit the
Time Zone packets. Also, if part of your broadcast region observes Daylight Saving Time and part of it
does not then you should not transmit Time Zone packets. Viewers in your area will have to set their
own VCRs and television sets for the correct time zone, and whether they observe Daylight Saving
Time or not. Note: if you transmit Time Zone packets in either of these cases viewers' VCRs will not be
set correctly.
When you exit MetaCast 2, you will be presented with the choice to continue encoding XDS packets or
to remove them from the 8084AD packet stream. To continue sending the Time of Day and Time Zone
packets after you exit MetaCast 2 you will need to check the appropriate boxes; otherwise they will be
removed.
APPLICATION NOTE 3
Models 8084/8084AD/8085 Closed Caption Encoder Manual
Revision 1.6.6
AN3-10
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