Flock Safety, the police technology company most notable for their extensive network of automated license plate readers spread throughout the United States, is rolling out a new and troubling product that may create headaches for the cities that adopt it: detection of “human distress” via audio. As...
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I had to do a bit of research to remind myself. We did this in university as an exercise, so it was a while ago.
Basically with N signals (speakers) and M mixes (microphones). When M > N then you can create an MxN matrix and solve it numerically, and we were able to do that pretty easily. We also did the case where M=N as a demo and we used ICA for that with either projection pursuit or SVD, I can’t remember.
You can read more about this on Wikipedia:
With modern models this would be even easier with fewer microphones, and there’s been a lot of time and money between when these methods were devised and now.