HD9084 HDTV Caption Encoder Manual
OPERATION Page 3-35
desired settings have been altered. Press SELECT to skip configuring a setting. Once the user has
cycled through the UTC menu, SET UTC TIME will be displayed on the front panel. Press SETUP to
exit this level.
3.7.1.1. Daylight Saving Time Explained
Daylight Saving Time (DST) was instituted to take advantage of the later hours of daylight between
March and November. In 1966, the U.S. Congress passed the Uniform Time Act that standardized the
length of Daylight Saving Time. Daylight Saving Time begins at 2 a.m. local time on the second Sunday
of March. Time reverts to standard time at 2 a.m. local time on the first Sunday of November. In the
spring, clocks spring forward by 1 hour to 3 a.m.; in the fall clocks fall back by 1 hour to 1 a.m. Arizona,
Hawaii and most of Indiana have chosen not to observe Daylight Saving Time.
People often consider daylight saving time to be an event that happens twice a year, setting their clocks
ahead or back by one hour. In reality, DST is in effect (ON) for six months of the year and not in effect
(OFF) for the other six months, in regions that observe DST.
There are two XDS packets defined by CEA-608-B for encoding time and date information. The Time of
Day packet (0701) encodes the UTC time and contains a flag bit (DST Flag) that is to be set when
Daylight Saving Time is in effect (i.e. between the second Sunday of March and the first Sunday of
November).
The Time of Day packet must be inserted locally at each affiliate station if implemented so that the
correct time is encoded when programs are aired at different times across the network. The Time Zone
packet (0704) encodes the time zone offset from UTC time and contains a flag bit (DSO Flag) that is
to be set when the entire area served by the signal observes Daylight Saving Time. When the DSO
Flag bit is set to Off, it means that the DST Flag bit in the Time of Day packet will be ignored by the
VCR. The Time Zone packet must be inserted locally at each affiliate in order to encode the correct
time zone offset for the region.
(For more information, refer to the “XDS Time of Day” document located on the website at:
http://www.evertz.com/resources)
3.7.2. LTC Reader Option
LTC Time Setup: Used to configure whether the time input to the LTC Reader port is Local or UTC
time.
LTC Date Setup: Used to configure the format of date and timezone information contained in the
LTC user bits, if any.
Currently, the LTC Reader Option is not available; therefore, these menu items
do not have no practical application.
3.7.3. CDP Time Encode
The CDP Time encode parameter provides the ability to select and encode time information into the
time section of the output CDP. The default setting for this control is disabled. To configure this option,
use the UP and DOWN arrows until CDP TIME ENCODE is displayed on the front panel. Press
SELECT to enter this option and use the UP and DOWN arrows to configure the state or control mode.
Press SELECT to enable the selection. The enabled setting will flash. Press SETUP to exit this level.
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