Mak wrote:
...continuing masturbatory tech talk.... What kind of audio captchas have people tried? I would think that asking people to identify a piece of music would be a pretty good captcha, although could be difficult to not make it Eurocentric. For instance, if you had a bunch of songs as universally recognisable as, say happy birthday, and then had a bunch of different recordings of those, it would be extraordinarily difficult for a computer to recognise the piece, since it could be in any key, in any tuning, with slight rhythmic diffences, but would still be recognisable to anyone who knew the piece. Yes, you would have to figure out what pieces to use and get the recordings, but it would still be cool. Of course, Carnildo/Mark's workaround would still be there. Makemi
"Happy Birthday to You" wouldn't be an option: it's still in copyright. See http://www.snopes.com/music/songs/birthday.asp
Also, tune recognition is pretty much a done deal, thanks to the [[Parsons code]] and similar techniques. There are a number of commercial music recognition products available.
-- Neil