BSL PRO 4 Manual - Biopac

Part C — Analysis Functions 249Result of correlation and mean square error functions5) Use the zoom tool to inspect the abnormalities more closely.Remove meanA drifting baseline can be a problem in comparing waveforms. If you perform a Template function and thetemplate or the waveform has a slowly moving baseline, you can increase the effectiveness of the comparisonby choosing Remove mean from the submenu of the Template function. The remove mean option causes themean amplitude value of the template and the compared section of the waveform to be subtracted from eachother before the sections are compared. This way, a large baseline offset will have very little effect on thecomparison. This option is toggled every time it is selected and is enabled when a check mark is present.For example, the following graph shows the original waveform at the top, the correlated waveform with meanremoval in the middle, and the same correlation without mean removal at the bottom. Note how the meanremoval effectively compensates for the drifting baseline in the original waveform.Correlation with and without mean removalBSL PRO Manual