-> Signal Processing Toolbox

-> Signal Package

-> Control Package

Make sure that the listed Dependencies are installed and loaded into Matlab.

Run the fff_segmenter script by typing directly into the command window followed by the press of the Enter key on the keyboard, or by clicking in the run button of the Matlab text editor.

Matlab fff_segmenter After running the fff_segmenter algorithm, the user will be presented with the graphical interface displayed below.

In the graphical interface: - The user must use the Select data button to select the .mat file which contains the acoustic signal and the X and Y direction control signals. - The user must insert the Sampling frequency of the signals in Hertz (Hz). - The user must insert the name of the sensor signal that exists in the selected .mat file on the Raw signal identification field. - The user must insert the name of the direction X axis signal that exists in the selected .mat file on the DirX identification field. - The user must insert the name of the direction Y axis signal that exists in the selected .mat file on the DirY identification field. - The user must select the Segmentation mode between Points and Segments. If the choice is not made, the default Points mode will be utilized. - The user must select the Unit segmentation between Number of samples and Seconds. If the choice is not made, the default Number of samples mode will be utilized. - The user may select additional Outputs that can be generated by the algorithm. The available outputs are Obtain graphical visualization, Save graphical visualization if obtained, and Obtain automatic .mat files. If none additional Outputs are selected, the fff_segmenter function output will only be the segmentation results to the current Matlab workspace.

About the additional outputs: - The Obtain graphical visualization option will generate a figure with the segmentation results displayed on top of the Sensor signal. - The Save graphical visualization if obtained option will save the generated figure in the Segmentation results folder. - The Obtain automatic .mat files option will save the segmentation results in the Segmentation results folder in .mat format. The output data file name follows a definition that is based on the Segmentation mode choice, and the identification of the sensor signal in the dataset.

For the purpose of this example, the Select data button will be used to load the Test1.mat file from the Data folder. The Select data button will open a file explorer window, where the user can navigate to the Data folder and select the Test1.mat file. The rest of the input fields will be filled with the values in regard to the Test1.mat dataset, with default values for the Segmentation mode and Unit segmentation options, and with all of the available outputs toggled to Yes.

When the user toggle to On the Run the segmentation button, the graphical input interface will be closed and the fff_segmentation algorithm will run with the defined parameters.

As a result of running the fffsegmentation algorithm with default parameters, two new files were generated in the Segmentation results folder, which was created in the Matlab's current path. The first, named `Points segmentation results Acousticsignal, holds the results of the segmentation in thePointssegmentation choice, saved in table format. The output data file name follows a definition that is based on theSegmentation modechoice, in this casePoints, and the identification of the sensor signal in the dataset, in this caseAcoustic_signal`.
The figure below demonstrate the contents of the Points segmentation results Acoustic_signal in the Matlab workspace.

Opening each table in Matlab, it is possible to observe that the point segmentation mode generates three columns for each geometric feature, and two columns for the pattern's separation. In regard to the geometric features tables, the first column is the Duration of the feature fabrication, the second column is the first instant index, identified as StartPoint, of the feature fabrication, and the third column is the EndPoint of the feature fabrication in the default number of samples mode.

The second file, named Segmentation results Acoustic_signal, is the automatically saved figure with the predetermined resolution and formatting. The image obtained for this example is represented in the figure below.