1. A physiological monitoring device, comprising: a sound capture system adapted to generate an acoustic signal recording body sounds; an acoustic signal processing system operatively coupled with the capture system and adapted to determine a total energy of a segment of the signal, calculate for each of a plurality of signal classes a probability that the segment belongs to the signal class based at least in part on the total energy and profile data for the signal class, and assign the segment to one of the plurality of signal classes based at least in part on the probabilities; and a physiological data output system operatively coupled with the processing system and adapted to selectively output, depending on the assigned signal class, physiological data based at least in part on the segment.