So, we have some Logitech C920 cameras. They are really good for their price and sport a couple of microphones with echo cancellation and an omnidirectional pattern. Which is quite great for its intended use but a major pain if what you want to perform voice activity detection. Basically, all the cameras trigger when someone speaks. It can be worked around but things are a lot easier when the sound from one camera doesn’t leak that much into the others.<\/p>\n
Not wanting to replace or modify the internal microphone array if there was another way I decided to test if with some absorbent foam the response could be shaped to something more useful.<\/p>\n
I cut a couple of rectangular prisms with cavities that more or less match the shape of the cameras. My supply of plushy fabric was rather limited and so I planned a bit more carefully how to divide it and make the crevices. After that I just cut it in four equal pieces and held everything with hot melt glue and some stitches.\n\t\t