Mumbling again

a Last night, about 8 pm give or take a few minutes, I was upstairs with my dog Shadow when I experienced a brief episode of mumbling, The mumbling sounded female and angry. As usual I could not make out any words. Shadow reacted with her ears going erect but she seemed confused as to where the sounds were coming from.. The mumbling only lasted roughly half a minute. Sounds from the street need to be extremely loud to penetrate the walls of this house. Basketball players on the village playground only two lots and across the street from here are not heard. The fact that the mumbling seems to have no point of origin also eliminates an outside source. It would be really interesting to me if I could tell what was being said. My wife was reading a book and heard nothing.