You wouldn't even have to keep recordings of the whole day. I learned a neat trick from watching the making of the show "Planet Earth". To record some of the am

You wouldn't even have to keep recordings of the whole day. I learned a neat trick from watching the making of the show "Planet Earth". To record some of the amazing unexpected events, they would have a camera running constantly that keeps about 10 seconds of HD video in memory at a time, then deletes it. When they see something cool happen, like a shark jumping out of the water, they just hit a button. That button tells the camera to not delete video that is more than 10 seconds old. That way they didn't fill up their hard drives and they got the unexpected stuff. What you could do is have a sound analyzer listen for speech and it would be like pressing that button, you'd get whatever happened 10 seconds or whatever, before you started spontaneously jabbering. :)