Yes, someone posted an article that refered to his exercise of altering the signals to be close to audible speech awhile ago, and everyone called it bunk. It is a little more effective when taken in context.

I think about stuff like this when I think about extraterrestrial life. I wouldn't be surprised if there was an extraterrestrial intelligence out there that believes the Earth itself is an organism and each individual person can't possibly be intelligent on its own, especially given the incredibly predictable way we live our lives.