ETSI - PRETS 300 472
Digital Broadcasting Systems for Television, Sound and Data Services; Specification for Conveying ITU-R System B Teletext in Digital Video Broadcasting (DVB) Bitstreams Second Edition
| Organization: | ETSI |
| Publication Date: | 1 January 1996 |
| Status: | inactive |
| Page Count: | 12 |
scope:
This draft second edition European Telecommunication Standard (ETS) specifies the method by which ITU-R System B Teletext [3], also known as EBU Teletext [4], may be carried in DVB bitstreams. This transport mechanism is intended to satisfy the following requirements:
- to support the transcoding of the teletext data into the Vertical Blanking Interval (VBI) of analogue video. The transcoded signal should be compatible with existing TV receivers with teletext decoders;
- the maximum data rate for each teletext service is equivalent to 16 lines per field so that the service is always suitable for transcoding into the VBI;
- the transmission mechanism should be capable of transmitting subtitles with accurate timing with respect to the video (i.e. to within or near frame accuracy).
A more general data transport mechanism for conveying new types of data services is outside the scope of this ETS, but the transport syntax specified here can also be adapted for other data.
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