A method of acoustic monitoring includes transducing acoustic energy from
a first acoustic transducer attached to a first location on a patient the
acoustic energy from the first transducer, comprising desired acoustic
energy to be monitored and interfering acoustic energy and transducing
acoustic energy from a second acoustic transducer, attached to a second,
different location on a patient, the acoustic energy from the second
transducer, comprising desired acoustic energy to be monitored and
interfering acoustic energy. The method also includes converting the
acoustic energy sensed at the first and second locations into first and
second electrical signals and processing the first and second electrical
signals to digitally remove interfering acoustic energy present in the
second signal to provide an electrical signal representative of the
acoustic signal that is being monitored.