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<td colspan="12" class="center" valign="middle" class="italic" ><a href="http://wwweng.uwyo.edu/electrical/">
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<a href></a><a href="pronytoolhelp.html"><h3 class="sidenavigate">Prony Analysis</h3></a>
<a href></a><a href="design.html"><h3 class="sidenavigate">Design Basis of the PTbox</h3></a>
<a href></a><a href="references.html"><h3 class="sidenavigate">References</h3></a>
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<h2 class="mainbody">GUIs in the Prony Toolbox</h2>
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<p>PTbox consists of five GUI抯:</p>
<ul class="pfont">
<li>Splash GUI</li>
<li>Prepare Prony Data GUI</li>
<li>Perform PA GUI</li>
<li>Compare PA Sessions GUI</li>
<li>Export Data GUI.</li>
</ul>
<p>Each of the GUIs is designed to implement a particular task. For example, the Prepare Prony Data GUI performs data preprocessing tasks and prepares the data for PA. The data flow in the PTbox is summarized in Figure 4.4.1. First data is obtained and preprocessed in the Prepare Prony Data GUI and then PA is performed. In the last GUI, PA sessions are compared. The Export Data GUI allows the export of data associated with each GUI.</p>
<h2>Prepare Prony Data GUI</h2>
<p>The main features of this GUI are as follows:</p>
<p class="bold">Import Data:</p> <p>A file open dialog window appears when the user presses this push button. The user has to choose a data file from the traditional file open dialog. The data file should be in MATLAB MAT-file form. Once the file is selected and successfully read, the variables are shown in two list boxes.</p>
<p> PTbox requires that the data should be stored along with variable names in the MAT-file; the read fails if the file does not contain variable names. PTbox uses the variable names for display in the selection list boxes. Presently, PTbox does not provide the flexibility of modifying the data names. However, this should not be a limitation as the names in the MAT-file can be modified directly by the user via the load and save commands of MATLAB.</p>
<p class="bold"> Plot:</p> <p>This push button plots the variables selected by the user from the dependent and independent variable list boxes. It is a plot of the original data with no preprocessing.</p>
<p class="bold">Decimation:</p> <p> This option allows the user to specify a particular data range and reduce the data length by decimating the signal. The extent of data length reduction is typically described by the down sampling.
PTbox obtains the down-sampling factor M from the user and performs M-fold decimation. For example: if the user has specified a down-sampling factor of two then the toolbox selects alternate samples of the data, hence the decimated signal samples appear at a rate slower than that of the original signal by a factor of two.
The down-sampling process can cause aliasing in the frequency domain. Hence, an antialiasing filter with cut off frequency of pi/M should be used before down sampling. Presently PTbox does not provide the flexibility of filtering the decimated signal. PTbox has 慸ecimation off⌨️ 快捷键说明
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