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Shazam like java app :)
Well I stumbled upon this blog
http://www.redcode.nl/blog/2010/06/creating-shazam-in-java/
( whose author stumbled upon this blog )
http://laplacian.wordpress.com/2009/01/10/how-shazam-works/
and I guess audio is really one of the areas of multimedia computing I have not really explored much all those years..
Although I don`t like the language of implementation ( I mean Java 
) of Roy van Rijn , a music/sound classifier should come in handy with the guard dog project.
I guess , with the correct microphones , it could be trained to detect from dogs barking to birds singing or rain , etc. This kind of basic functionallity ( not human speech recognition ) , but ambient waveform recognition would make a robot much more “human” because we have hardcoded built in the ability to distinguish sounds..
Also it is truly disgusting that the copyright holder for the Shazaam algorithm mailed a “threatening” message ( http://www.redcode.nl/blog/2010/07/patent-infringement/ and http://www.redcode.nl/blog/2010/11/patent-infrigement-part-2/ ) ..
Well I guess everything is explained here -> http://patentabsurdity.com/