Arthur C. Clarke wrote a short story in which a scientist invents such a device to measure how much his wife talks, relative to him. No idea how easy it could b

Arthur C. Clarke wrote a short story in which a scientist invents such a device to measure how much his wife talks, relative to him. No idea how easy it could be, but it seems straightforward: connect speech recognition software to a mic and counts the number of words. The only problem could be detecting the speakers when there is more than one.