As explained in the overview, EMD is most useful (and as we will see later, perhaps only useful) for non-linear, non-stationary signals, and natural signals. As an example of this, we have applied the EMD to several signals, two of which are the raw data from electrocardiograms that we found on the web. The horizontal axis represents sample number, as sampling rate was not available for both.

Note: If using a new browser that typically fits pictures to windows, make sure to maximize any full size signals you decide to view or they may appear distorted or fuzzy.