Beat alignment and selection for cardiac mapping

A method comprising:

• for each of multiple, different catheter positions in a heart cavity, concurrently measuring signals at one or more catheter electrodes on a catheter in response to electrical activity in the heart cavity and collecting a plurality of additional data signals;
• defining a template set comprising information related to the plurality of additional data signals collected during an exemplary beat of interest;
• computing criteria for each of the plurality of additional data signals based on a comparison of the plurality of additional data signals and the template set;
• synchronizing the signals measured at the different catheter positions with one another according to a heart beat cycle by calculating a single synchronization offset, wherein the single synchronization offset is a time value based on the plurality of the computed criteria and the difference between a marker in the template set and a point in the plurality of additional data signals;
• selecting a subset of less than all of the synchronized signals by determining whether to include the signals for a cardiac beat in the subset of less than all of the synchronized signals based on the computed criteria related to the plurality of additional data signals;
• and
• determining physiological information at multiple locations of the endocardium surface based on the measured signals at the different catheter positions by processing the selected subset of the synchronized signals.