Patent ID: 7682316

Claim:
An implantable medical device system, comprising: a first acoustical sensor adapted to be operatively positioned in a first internal body location to have a first level of responsiveness for sensing heart sounds in a patient, and to generate a first signal responsive to the sensed heart sounds; a second acoustical sensor adapted to be operatively positioned in a second internal body location to have a second level of responsiveness for sensing heart sounds in the patient less than the first level of responsiveness, and to generate a second signal responsive to the heart sounds; and an implantable medical device comprising a housing and a processor enclosed in the housing, the processor configured to receive the first signal and the second signal and generate a corrected first signal by canceling non-cardiac signals in the first signal using the second signal; wherein the housing comprises: a first side, said first acoustical sensor being positioned on said first side; and a second side opposite said first side, said second acoustical sensor being positioned on said second side.