Figure 6.

Shown are the different types of classification errors. These are shown for illustrative purposes and are not actual output of the algorithm. The dotted vertical line indicates the correct position of the beat onset. (A) Shows the typical situation in which a false negative arises: the algorithm fails to mark an onset for an obvious beat in between two neighboring detected beats. (B) Shows an example of a false positive, in which an extra onset unassociated with any true onset has been detected. (C) Illustrates a misaligned beat in which a true onset has been found, but its placement is offset from the true location.