Model 8084, 8084AD and 8085 Closed Caption Encoders
Manual Change Sheet 1.3-1
Date of Issue: July 26, 2002
Page 3 of 6
Copyright Evertz Microsystems Ltd. All rights reserved
Local Time
Field 1 Data
Present Upstream
Field 2 Data
Present Upstream
Daylight Saving
Time in Effect
(.) = DST On
(:) = DST Off
LTC Timecode
Input Active
.: 09.52.02
T
Daylight Saving
Time Observed
(.) = DSO On
(:) = DSO Off
Figure 1: 8084AD Front Panel Time Indicators
There are two XDS packets defined by EIA-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 first Sunday of April and the Last Sunday of October).
The
Time of Day
packet must be inserted locally at each affiliate station 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 VCR will ignore the DST Flag bit in the Time of
Day packet. The
Time Zone
packet must be inserted locally at each affiliate in order to encode the
correct time zone offset for the region. See application note AN3 at the back of the 8084 manual for
more information about encoding time in XDS packets.
4.
XDS TIME OF DAY AND TIME ZONE PACKET ENCODING
The encoding of the XDS
Time of Day
packet (0701) and
Time Zone
packet (0704) has been enhanced
to improve the interoperability with various models of consumer VCRs. Application note AN3 at the
back of the 8084 manual gives some interoperability details about various VCR models. The
information in section 4.1 updates the information in section 5.2 of AN3. The information in sections 4.2
and 4.3 about JVC and Sony VCRs should be added after section 5.2 of AN3.
