1. A method for processing an acoustic signal, comprising the steps of: receiving an acoustic signal recording body sounds on a respiration monitoring system; detecting first noisy portions of the signal based at least in part on cumulative energies in the signal with the system; detecting second noisy portions of the signal based at least part on peak energies in the signal with the system; isolating third noisy portions of the signal based at least in part on the first noisy portions and the second noisy portions with the system, including designating, as third noisy portions, intersections between first noisy portions that envelop second noisy portions and second noisy portions that are enveloped by first noisy portions; calculating a respiration parameter estimate using the signal without resort to the third noisy portions with the system; and outputting information based at least in part on the respiration parameter estimate on the system.