Techniques for WCAG 2.0

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# G9: Creating captions for live synchronized media

## Applicability

Applies to all technologies that present audio visual information.

This technique relates to:

- Success Criterion 1.2.4 (Captions (Live))
  - How to Meet 1.2.4 (Captions (Live))
  - Understanding Success Criterion 1.2.4 (Captions (Live))

## Description

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.

## Examples

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

## Resources

Resources are for information purposes only, no endorsement implied.

- CaptionCaster

## Related Techniques

- G87: Providing closed captions
- G93: Providing open (always visible) captions
- G157: Incorporating a live audio captioning service into a Web page

## Tests

### Procedure

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

### Expected Results

- Check #1 is true.

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