The present document specifies the method by which ITU-R System B Teletext (ITU-R Recommendation 653 [3])@ also known as EBU Teletext (see EBU SPB 492 [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 the present document@ but the transport syntax specified here can also be adapted for other data.
EN 300 472-1997由ETSI - European Telecommunications Standards Institute 发布于 1997-08-01,并于 2014-04-17 实施。
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