# Understanding Sign Language (Prerecorded)

## In brief

Goal
  Videos can be accompanied by sign language.
What to do
  Provide sign language interpretation for audio content in existing videos.
Why it's important
  People who are deaf or hard of hearing have more ways to understand multimedia content.

## Intent of Sign Language (Prerecorded)

The intent of this Success Criterion is to enable people who are deaf or hard of hearing and who are fluent in a sign language to understand the content of the audio track of synchronized media presentations. Written text, such as that found in captions, is often a second language. Because sign language provides the ability to provide intonation, emotion and other audio information that is reflected in sign language interpretation, but not in captions, sign language interpretation provides richer and more equivalent access to synchronized media. People who communicate extensively in sign language are also faster in sign language and synchronized media is a time-based presentation.

## Benefits of Sign Language (Prerecorded)

- People whose human language is a sign language sometimes have limited reading ability. These individuals may not be able to read and comprehend the captions and thus require a sign language interpretation to gain access to the synchronized media content.

## Examples of Sign Language (Prerecorded)

- Example 1. A corporation is making an important announcement to all of its employees. The announcement will be held in the main headquarters and later streamed to the Web. A sign language interpreter is provided at the announcement location for the employees that are present in the meeting room. For the Web version of the announcement, the sign language interpreter is shown/superimposed in the corner of the display.
- Example 2. A university is providing an online version of a particular lecture by creating a synchronized media presentation of the professor delivering the lecture. The presentation includes video of the professor speaking and demonstrating a science experiment. A sign language interpretation of the lecture is created after the lecture and presented on the Web with the synchronized media version.

## Resources for Sign Language (Prerecorded)

- Synchronized Multimedia Integration Language (SMIL) 1.0
- Synchronized Multimedia Integration Language (SMIL 2.0)
- Accessibility Features of SMIL
- NCAM Rich Media Accessibility, Accessible SMIL Templates
- National Institute on Deafness and other Communication Disorders: Information on American Sign Language
- Techniques for filming sign language interpreters
- Royal National Institute for Deaf People (RNID)

## Techniques for Sign Language (Prerecorded)

### Sufficient Techniques for Sign Language (Prerecorded)

- Including a sign language interpreter in the corner of the video stream

- Providing a synchronized video of the sign language interpreter that can be displayed in a different viewport or overlaid on the image by the player using one of the following techniques

  - Providing sign language interpretation through synchronized video streams in SMIL 1.0
  - Providing sign language interpretation through synchronized video streams in SMIL 2.0

### Additional Techniques (Advisory) for Sign Language (Prerecorded)

### Failures for Sign Language (Prerecorded)