System and method for reconstructing cardiac activation information

A system to reconstruct cardiac activation information, the system comprising:

• a computing device storing instructions that, when executed by the computing device, cause the computing device to perform operations comprising:
• accessing pairs of cardiac signals out of a plurality of cardiac signals obtained from a patient, the pairs having a first cardiac signal that is common among the pairs and second cardiac signals that are different among the pairs;
• processing the first cardiac signal and the second cardiac signals of the pairs to determine whether there are points of change in the first cardiac signal at which a derivative of the first cardiac signal diverges with respect to derivatives of the second cardiac signals above a threshold;
• and
• assigning an activation onset time at a point in the first cardiac signal based on correspondence of the points of change to define a cardiac activation indicating a beat if the points of change are in the first signal.