Techniques for WCAG 2.0

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G9: Creating captions for live synchronized media


Applies to all technologies that present Audio Visual information

This technique relates to:


The objective of this technique is to allow users who cannot hear to be able to access real-time synchronized media broadcasts. It is more difficult to create accurate real-time captions because there is little time to correct mistakes or to listen a second time or consult someone to be sure the words are accurately reproduced. It is also harder to simplify or paraphrase information if it is flowing too quickly.

Real-time typing text entry techniques exist using stenographic and rapid typing technologies. Re-voicing speech-to-text (where a person listens to speech and then carefully re-voices it into a computer trained to their speech) is used today for telephone relay services and may be used in the future for captioning. Eventually speech-to-text with correction will be possible.


Example 1

Example 1: A television studio uses a real-time captioning service to create captions for its evening news online.


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  1. a procedure and policy are in place to ensure that captions are delivered in real-time

Expected Results