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These instructions explain how to automatically generate live captions in your web browser for any audio/video that is playing on your computer, including people speaking in a live Collaborate session.

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Your recorded audio is sent to Google's speech-to-text service and the captions are sent back to your browser. At no point does your audio pass through Web Captioner servers. For more info read Web Captioner's privacy page.

Overview of the Process

The first step is to install a program called VB-Cable. We use VB-Cable to take your computer audio and turn it onto a virtual microphone. Next we will use a free website, Web Captioner, to listen to the virtual microphone and automatically generate live captions and display them in your web browser. To put this another way, Web Captioner will listen to your computer's audio and automatically caption what it hears. Web Captioner is a website, you will grant permission for Web Captioner to listen to your audio, and once you've closed the browser tab that runs Web Captioner it can no longer listen to your audio (until you re-open it).

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At the bottom right select the Start Captioning button. If Web Captioner asks to use your microphone, grant it permissions to do so.


Web Captioner will should now display the captions of any voice audio that is playing on your computer, including a live Collaborate session.

At this point Web Captioner should be working. If it's not working refer to the Troubleshooting section below.

Please also consider the following

  • Web Captioner

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  • often

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  • displays a "Too Quiet" warning at

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  • the bottom. If captioning is working then you can usually ignore this

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  • .
  • While using VB-Cable with the above configuration you will not be able to adjust the volume using the Windows volume control, but you can still control the volume using the volume control in each program (e.g., Collaborate

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With these changes, your computer system audio is now available to programs such as Web Captioner as the VB-Cable CABLE Output microphone.

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  • volume controls).

Other Things You May Want to Know

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  • Reboot the computer and try it again.
  • Ensure Windows Volume is not muted
  • Try running Web Captioner in Ensure that you're using the Chrome web browser, if you're not already.
  • If you want to caption a specific program's audio, ensure that the audio output device for that program is set to CABLE Input.
  • More suggestions coming...

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