Patent ID: 8805486

Claim:
An implantable medical device comprising: a processor; an endocardial acceleration sensor; and a machine-readable storage medium having instructions stored thereon that, when executed by the processor, cause the processor to: divide an endocardial acceleration (EA) signal into a plurality of EA sub-signals, wherein the EA signal is collected over a plurality of cardiac cycles using the endocardial acceleration sensor, and wherein each of the plurality of EA sub-signals corresponds to a single cardiac cycle of the plurality of cardiac cycles; identify, in each of the plurality of EA sub-signals, at least one signal component associated with a type of heart sound, wherein each signal component is associated with the cardiac cycle of its EA sub-signal; extract a characteristic of the at least one signal component for two or more of the plurality of cycles; calculate a correlation coefficient correlating the characteristic of the at least one signal component for a first cycle of the plurality of cycles to the characteristic of the at least one signal component for a second cycle of the plurality of cycles; and perform temporal retiming of the at least one signal component based on the calculated correlation coefficient to generate one or more adjusted signal components of the associated one or more EA sub-signals.