Google is striving to make YouTube friendlier for deaf and hard of hearing people. It today announced the launch of machine-generated automatic captions. But it has chosen to limit the technology to a few YouTube channels for now.

The auto-cap feature has been built on top of the YouTube caption system, and uses the same speech-to-text technology as Google Voice. Though the auto-cap feature is only meant to work with English-language speech, it is possible to automatically translate these automatically-generated captions to 51 different languages.

Another new feature has been added to YouTube in the form of "automatic caption timing." Captions are created using the transcript (text file) uploaded by the user. Google's automatic speech recognition (ASR) technology helps ensure that each word hits precisely the right mark on the timeline, making it easier for users to manually create captions.

"Each of these features has had great personal significance to me, not only because I helped to design them, but also because I'm deaf. Today, I'm in Washington, D.C. to announce what I consider the most important and exciting milestone yet: machine-generated automatic captions," Google engineer Ken Harrenstien wrote in a post on the Official Google Blog.

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