Open Window Design and Analysis Tool
wintool opens the Window
Design and Analysis Tool (WinTool), a graphical user interface (GUI)
for designing and analyzing spectral windows. It opens with a default
64-point Hamming window.
A related tool,
wintool has three panels:
Window Viewer displays the time domain and frequency domain representations of the selected window(s). The currently active window is shown in bold. Three window measurements are shown below the plots.
Leakage factor — ratio of power in the sidelobes to the total window power
Relative sidelobe attenuation — difference in height from the mainlobe peak to the highest sidelobe peak
Mainlobe width (-3dB) — width of the mainlobe at 3 dB below the mainlobe peak
Window List lists the windows available for display in the Window Viewer. Highlight one or more windows to display them. The Window List buttons are:
Add a new window — Adds a default Hamming window with length 64 and symmetric sampling. You can change the information for this window by applying changes made in the Current Window Information panel.
Copy window — Copies the selected window(s).
Save to workspace —
Saves the selected window(s) as vector(s) to the MATLAB® workspace.
The name of the window in
wintool is used as the
Delete — Removes the selected window(s) from the window list.
Window Information displays information about the currently
active window. The active window name is shown in the
To make another window active, select its name from the Name menu.
Each window is defined by the parameters in the Current Window Information panel. You can change the current window's characteristics by changing its parameters and clicking Apply. The parameters of the current window are
Name — Name of the window. The name is used for the legend in the Window Viewer, in the Window List, and for the vector saved to the workspace. You can either select a name from the menu or type the desired name in the edit box.
Type — Algorithm for the window. Select the type from the menu. All Signal Processing Toolbox™ windows are available.
MATLAB code — Any valid MATLAB expression
that returns a vector defining the window if
Length — Number of samples.
Parameter — Additional parameter for windows that require it, such as Chebyshev, which requires you to specify the sidelobe attenuation. Note that the title "Parameter" changes to the appropriate parameter name.
Sampling — Type of sampling
to use for generalized cosine windows (Hamming, Hann, and Blackman)
n+1 window and returns the first
Symmetric computes and returns the
In addition to the usual menus items,
wintool-specific menu commands:
In the Window List in WinTool, highlight the window(s) you want to export and then select File > Export. For exporting to the workspace or a MAT-file, specify the variable name for each set of window coefficients. To overwrite variables in the workspace, select the Overwrite variables check box.
Full View Analysis — Copies
the windows shown in both plots to a separate
window. This is useful for printing and annotating. This option is
also available with the Full View Analysis toolbar button.
Time domain — Select to show the time domain plot in the Window Viewer panel.
Frequency domain — Select to show the frequency domain plot in the Window Viewer panel.
Legend — Toggles the window name legend on and off. This option is also available with the Legend toolbar button.
Analysis Parameters — Controls the response plot parameters, including number of points, range, x- and y-axis units, sampling frequency, and normalized magnitude.
You can also access the Analysis Parameters by right-clicking
the x-axis label of a plot in the Window Viewer
panel. The x-axis units for the time domain plot
depend on the selected
Sampling Frequency units.
Zoom In — Zooms in along both x- and y-axes.
Zoom X — Zooms in along the x-axis only. Drag the mouse in the x direction to select the zoom area.
Zoom Y — Zooms in along the y-axis only. Drag the mouse in the y direction to select the zoom area.
Full View — Returns to full view.