Patent ID: 7706866

Claim:
A signal separation method, comprising: sensing, at least in part implantably, a plurality of composite signals at a plurality of locations; performing source separation on the detected plurality of composite signals to produce a set of signal vectors; selecting, from the set of signal vectors, a target vector associated with a target signal, the target vector representative of a signal vector of the set of signal vectors associated with higher quality cardiac data relative to other signal vectors of the set of signal vectors; detecting a change in a predetermined condition or an event occurrence indicating that changing which vector of the set of signal vectors is selected as the target vector may be useful in sensing cardiac activity; and updating, in response to the change in the predetermined condition or event occurrence, selection of the target vector to update the target vector by performing a subsequent source separation on the detected plurality of composite signals and reselecting the same or a different vector associated with higher quality cardiac data relative to other signal vectors of the set of signal vectors as the target vector based on the subsequent source separation.