This reminds me of the "acoustic vector sensor" developed by a Dutch acoustics firm that can pinpoint any conversation in a crowd. https://www.newscientist.com

This reminds me of the "acoustic vector sensor" developed by a Dutch acoustics firm that can pinpoint any conversation in a crowd. https://www.newscientist.com/article/mg21929364-400-matchstick-sized-sensor-can-record-your-private-chats/ https://www.newscientist.com/article/mg21929364-400-matchsti...