"and cannot distinguish users"
Oh, but it can. It can also determine age within certain ranges, gender and a multitude of other things. There are some excellent books available on information to be determined by audio surveillance. People have been better than computers up to now, but the computers are getting very close and even better for some types of info. All you need to do is add a web connected video camera and some system somewhere is going to put the two together and be able to pull up a picture every time it hears a certain voice. 1984 is a little late in coming.
Biting the hand that feeds IT
