Synchronize data manually after import

Aim

To adjust the offset between external data and video/track data.

note  You change the offset of the original signal. The offset is automatically applied to all the EthoVision XT variables derived from that signal. Choose Analysis > Results > Integrated Visualization.

Procedure

1.From the lists available on the toolbar, choose the Track smoothing profile, the Data profile, the Analysis profile and the trial to visualize.

▪Make sure that the signals are well visible; zoom in/out if necessary.

▪If you want to re-synchronize using an event visible in a specific video frame, position the video to that frame.

2.Click the External data synchronization button on the toolbar, or choose Show/Hide > External data synchronization.

 

If no original signal is displayed in a chart, EthoVision asks you to select the original signal for synchronization.

Take note of the original start and top time in the Synchronize external data window. If you change the offset (next step) and click OK, the start/stop times are overwritten and cannot be recovered.

 

3.You can synchronize data in two ways:

▪In the Synchronize external data window, enter the new Start date and time and the Stop date and time for the chosen signal.

 

▪In the plot area, hover the mouse over the original signal and drag to the position you require.

 

While you drag the mouse, the time plot of the original signal is shifted to the left or to the right. The Synchronize external data window shows the new Start and Stop time of the original signal. Release the mouse button when ready.

4.Select the option Apply synchronization to all signals originating from the same data file if you also want to apply that offset to the EthoVision XT variables derived from the other signals imported from the same data file.

Make sure to keep this option selected when you import data sets from the same data file (for example, call data imported from UltraVox XT 3), and you want to maintain the original offset for all those data sets.

5.When ready, click OK.

Notes

▪The shift in the offset is also applied to signals derived from the original signal, which are not currently visualized.

▪After clicking OK, the shift in offset cannot be undone! To restore the original offset you must know the original Start and top time and enter them in the Synchronize external data window.

▪To stretch the data in time, enter new values for Start and Stop time in such a way that the duration of the data set is longer than the original. First enter Start time, then Stop time.

▪To shrink the data in time, enter new values for Start and Stop time in such a way that the duration of the data set is shorter than the original. First enter Start time, then Stop time.

▪If your data plots include EthoVision XT variables derived from signals other than the one you synchronize, these are not synchronized automatically, unless the original signals come from the same file and you select Apply synchronization to all signals originating from the same data file.

In all other cases, to synchronize those variables, open the signal they are derived from, and repeat the procedure above for that signal.

▪Re-synchronization may affect your data selection when this contains Nesting functions based on those external data. For example, your Data profile contains a Nesting function based on Temperature state, which selects the intervals when Temperature > 30 ºC. If you re-synchronize Temperature and Temperature state, then also the intervals based on Temperature state will shift accordingly. Plot the data to check the changes.

▪To undo the changes and return to the current offset between data sets, click Reset in the Synchronize external data window.

 

If you synchronize external data at least once, re-opening the Synchronize external data window and clicking Reset does not restore the offset when you imported the data. It simply restores the last saved offset.