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Document CEA CEA-608-E is offered by IHS as part of an online subscription. This subscription contains many documents on the same topic.
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CEA CEA-608-E Document Information:
Title
Line 21 Data Services
Consumer Electronics Association
Publication Date:
Apr 1, 2008
Scope:
Where recommendations or requirements are made for service
providers, they apply to anyone who creates, transmits, or modifies
data, i.e., someone other than an equipment manufacturer. For
example, a "caption service provider" could be the agency which
creates the captions for a program, the distribution system (e.g.
network) which carries the captions on line 21, or the local
affiliate which uses its own data encoder to insert Text Mode or
XDS between the captions. In a few cases specific categories of
service providers are called out.
It is recommended that regardless of the function to be
performed, the reader should become familiar at least with all the
introductions to sections of this standard to avoid unintentionally
degrading other services, and then concentrate on the sections
which are appropriate to the activity being undertaken.
While there is no legal requirement to abide by this standard or
its recommended practices, except for those portions labeled
regulatory, it is strongly recommended that this advice be followed
by line 21 data service providers and manufacturers of equipment
used to transmit and receive these data services. Failure to follow
these practices is likely to result in a degraded and inferior
service and a non-uniform, unpredictable display of captions, text
or operation of XDS features on the consumer's receiver.
It is necessary to abide by this Standard to be CEA-608-E
compliant, however while methods described in this standard for the
inclusion of a service shall be followed, unless otherwise stated
no service is mandatory.
Purpose
CEA-608-E is a technical standard and guide for using or
providing Closed Captioning services or other data services
embedded in line 21 of the vertical blanking interval of the NTSC
video signal. This includes provision for encoding equipment and/or
decoding equipment to produce such material as well as
manufacturers of television receivers which are required to include
such decoders in their equipment as a matter of regulation (see
Annex F). It is also a usage guide for producing material using
such equipment, and for distributing such material.
This standard describes the specifications for creation,
transmission, reception, and display of caption data, plus the
relationship of Caption Mode data to other line 21 data. A
comparison of decoders meeting Federal Communications Commission
(FCC) rules to all decoders designed prior to the drafting of those
rules and a timetable for the implementation of features which are
unique to the different generations of decoders are retained from
the prior version.
ATSC DTV Closed Captioning, as well as a method of carrying the
CEA-608-E data stream in ATSC DTV is documented in CEA-708-C.
Guidance on digital transmission of CEA-608-E signals is
provided in SMPTE 334 and SMPTE EG-43.
Keywords:
- Program Guide
- Data Services
- DTV
- Data Stream
- TV
- Encoding
- Line 21
- Embedded Data
- content advisory
- Encode
- Transmission
- Decoding
- v-chip
- Decode
- CEA
- Closed Captioning
- video
- NTSC
- Digital Television
- analog television
- Data
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