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How are Audio Captchas created?

Is there a service provides the audio Catpchas that blind people complete when filling out a Captcha?

Is there a 3rd party service or do each provider make their own?

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I think it's a simple voice synthesizer – ratchet freak Oct 16 '12 at 10:01
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This is more a technical question than a UX question, I think. – André Oct 16 '12 at 10:05
Agree, this should be moved to SO – AndroidHustle Oct 16 '12 at 10:10
@AndroidHustle no it should be programmers.SE as it's not on a specific piece of code – ratchet freak Oct 16 '12 at 11:02
@ratchetfreak fair enough – AndroidHustle Oct 16 '12 at 11:30

closed as off topic by AndroidHustle, dhmholley, ChrisF, Benny Skogberg, dnbrv Oct 16 '12 at 13:55

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