[knolan]

Here is the project page from 2014:

http://people.csail.mit.edu/mrub/VisualMic/

And previous discussion:

https://news.ycombinator.com/item?id=8131785

https://news.ycombinator.com/item?id=9254654

[jwilk]

Also: https://news.ycombinator.com/item?id=16201745