8. Automatic Aedat Splitter

In addition to being able to split the aedat file manually Manual Aedat Splitter), NAVIS Tool has another function that allows to split the file automatically based on the activity level of the cochleae. This tool can be accessed by clicking on Tools->"Automatic Aedat Splitter" or on the button of the vertical toolbar that is highlighted on the next image.

Two new parameters are needed for this purpose. These can be modified before executing the process and will add some control over it. The first one is called Noise Threshold and it’s the percentage value from the total number of events fired in the aedat file that an integration period needs to have to be considered as sound instead of noise from the transition between two words. The Noise Tolerance tells for how many consecutive integration periods it is needed to detect a higher number of events than the percentage from the total (Noise Threshold) to be considered as a real sound instead of noise. Then, when a time period with not enough firing rate is detected, if the process has previously passed through Noise Tolerance consecutive times or more detecting sound, a new split is created, otherwise this information will be taken as noise and will be omitted in the results of this function.

These two parameters can be configured in the Tools tab on the settings window or in the window that shows up when clicking on the Automatic Aedat Splitter window.

The image shows the output of this function for the aedat file that we have been using in this wiki (using 100000 as Integration Period).

The pseudocode of this functionality is shown in the image below.