Patent Document ID: 20130237773
Application ID: 13767362
Patent Flag: 0

Claim One:
1. An apparatus comprising: a heart sound processor circuit, configured to receive a heart sound signal of a patient, the heart sound processor circuit configured to: obtain an initial heart sound expectation window function that describes a heart sound timing, of a specified type of heart sound, as a function of at least one physiologic variable, the physiologic variable comprising at least one of a heart rate, intrinsic vs. non-intrinsic beat, respiration rate, index of circadian timing, or posture, and the function comprising at least one characteristic parameter that describes a value of the heart sound timing at a specified value of the physiologic variable; detect a patient heart sound, of the specified type, using the initial heart sound expectation window function and the heart sound signal; update the at least one characteristic parameter using timing information from the detected patient heart sound of the specified type; and provide an updated heart sound expectation window function, using the updated at least one characteristic parameter, for subsequent use in detecting a patient heart sound of the specified type.