Patent ID: 8755535

Claim:
A medical device for non-invasively outputting a reduced noise signal responsive to acoustic vibrations indicative of one or more physiological parameters of a medical patient, comprising: a first acoustic sensing element configured to be acoustically coupled to a body of a patient at a first location, the first acoustic sensing element configured to output a first signal comprising a first physiological signal component and a first noise component; a second acoustic sensing element configured to be acoustically coupled to the body of the patient at a second location different from the first location, the second acoustic sensing element configured to output a second signal comprising a second physiological signal component and a second noise component; and a noise attenuator configured to: in response to selection of a first mode, produce a first reduced noise signal in response to the first and second signals, the first reduced noise signal related to a first sound component of the first physiological signal component of the first signal, the first noise component of the first signal attenuated based at least in part on the second physiological signal component and the second noise component of the second signal, the first sound component indicative of a physiological parameter the patient; and in response to selection of a second mode, produce a second reduced noise signal in response to the first and second signals, the second reduced noise signal related to a first sound component of the second physiological signal component of the second signal, the second noise component of the second signal attenuated based at least in part on the first physiological signal component and the first noise component of the first signal, the second sound component indicative of a physiological parameter the patient.