The Closed Caption System - evertz 8084 Instruction Manual

1.1

THE CLOSED CAPTION SYSTEM

CC1 Primary Synchronous Caption Service
CC2 Special Non-synchronous Use Captions
T1 First Text Service
T2 Second Text Service
OVERVIEW
Models 8084/8084AD/8085 Closed Caption Encoder Manual
The Closed Caption System provides for the transmission of data on line
21 of the NTSC composite signal, or Line 22 of the PAL composite video
signal. The EIA-608-B standard specifies nine data channels or "streams"
for line 21 data services. In each video field there are two caption streams
and two text streams. Field two also contains the Extended Data Service
(XDS) data stream. These are summarized in the chart below:
Field 1
The separate data streams are independent of each other in content.
Within each field, the streams are time-multiplexed. Control codes are
transmitted to announce the transition to a different stream. Home viewers
may generally select which data stream to display with their caption
decoders.
The primary Synchronous Caption Service (CC1) is primary language
captioning data that must be in sync with the sound.
Synchronous Caption Service (CC3) is an alternate captioning data
channel in sync with the sound, usually used for a second language.
Software applications such as the Evertz ProCap™ can be used to send
caption data to the 8084. Contact the factory for further information on
ProCap.
The special Non-Synchronous channels (CC2, CC4) carry data that is
intended to augment information carried in the program and is not
necessarily in sync with the sound.
Throughout this manual, the designators CC1, CC2, CC3, and CC4 are
equivalent to C1, C2, C3, and C4 respectively.
The four text services are used to carry general text information that may
not be related to the program content. Text stream T2 is often reserved to
carry URL data for WebTV applications. A text article software loader
program is supplied on the CD that came with your 8084. It may be used
to conveniently upload text articles for insertion into one of the text
services.
Extended Data Service stream contains information about the program
such as program title, length, and V-Chip-compatible program rating
information. The XDS Packet Control Windows 9x software application
supplied on the CD with your 8084 provides a convenient method of
inserting XDS data. See the XDS quick start pamphlet supplied with the
software for information on installing the software on your PC.
CC3 Secondary Synchronous Caption Service
CC4 Special Non-synchronous Use Captions
T3 Third Text Service
T4 Fourth Text Service
XDS Extended Data Services
Revision 1.6.6
Field 2
The Secondary
Page 1-2