In the WSJ Digits: It is often forgotten that phones can listen in ways other than during the usual call. A good piece that addresses this sensory mode.
" ... From chainsaws whirring in rainforests to snoring that sounds like chainsaws, entrepreneurs are finding all sorts of creative ways to detect sounds using smartphones.
App makers have long focused on detecting speech and music, but some upstarts are turning to a wider variety of sound-detection tasks. They are taking advantage of more sophisticated mobile hardware and software to recognize distinct audio patterns. ... "
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