Because these descriptions are pre-recorded, you do not have control over speed, voice or pitch. All users will hear these descriptions a screen reader is not needed, nor is a specific browser or any other special software. These descriptions are not integrated into the program-audio track, but instead are individually retrieved and played back according to a timing list created in advance. The player on the right, labeled "Pre-Recorded Audio Descriptions" (hereafter known as the pre-recorded player), displays video and delivers pre-recorded TTS descriptions in real time.Be aware that if your screen reader is set to read slowly, some descriptions may overlap, and thus obscure, the program audio. The speed, voice and pitch at which these descriptions are delivered will depend on your screen reader's settings. See the system requirements to learn about what combinations of screen readers and browsers can be used. You can, however, make the text visible by using the "Show/Hide Text" button, which can help in understanding what's going on with the screen reader. If you are not using a screen reader, you will not hear these descriptions. The player on the left, labeled "TTS Descriptions" (hereafter known as the TTS player), displays video and delivers text-based audio descriptions in real time that can be read aloud only by screen readers but are otherwise invisible and inaudible.Snort Sniffle Sneeze illustrates brief descriptions.Įach page contains two video players, one on the left side of the screen and one on the right:.The Sense of Taste shows descriptions in a documentary setting.Sintel demonstrates how longer descriptions can be used in dramatic settings.Simply Ming illustrates how descriptions can be compressed into the briefest of pauses, at times competing with the program audio.
A Change for Life shows how on-screen textual information can be made accessible using TTS descriptions.Each video shows off a different type of description technique, as described in the following list. This Web site showcases five brief videos, linked below, each of which demonstrates the two methods outlined above. At the time of playback, each description is individually retrieved and played aloud at intervals corresponding to the time-stamped script. Writing and time-stamping descriptions, then recording them using TTS technology.The descriptions remain otherwise invisible and inaudible to non-screen-reader users. Writing and time-stamping a description script, then delivering the descriptions as hidden text in real time in such a way that a user's screen reader will read them aloud.IBM and NCAM explored two approaches which exploit new HTML5 media elements- video, audio and track- as well as Javascript:
IBM-Research Tokyo recently partnered with the Carl and Ruth Shapiro Family National Center for Accessible Media (NCAM) at WGBH to research ways to deliver online audio descriptions via text-to-speech (TTS) methods, rather than using human recordings. In television programming, descriptions are usually delivered to the viewer via a separate audio channel and can be turned on and off in theatrical presentations, such as first-run movies, descriptions can be delivered via wireless transmitter to patrons wearing special headsets in an online environment, descriptions are often delivered as part of the regular program-audio soundtrack and cannot be turned off (these open-described movies are often offered as alternatives to the undescribed versions).
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This script is recorded by a human narrator, and the description audio track is then mixed with the regular program-audio soundtrack before the program or movie is broadcast. These descriptions are normally carefully timed to fit into the natural pauses of the dialog or narration. Traditionally, a describer will first write a script that describes key visual elements, such as costumes, scenery, scene changes, on-screen text, etc., that would otherwise not be available to viewers unable to see the screen. For more than 20 years, audio descriptions (also known as video descriptions) have been delivered using human narration.
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