If you try to rotate a 3D graphic to set the viewpoint somewhere on the Z-axis (view the 3D graphic from above), you will find out that it is not possible. That view is implemented as a separate option called “Spectrogram view”.


You can switch to a spectrogram view by selecting “3D Tools/Spectrogram view” from the menu, or by pressing the  graphic  button in the toolbar.


All operations, including ruler handling, zooming, colors changing... are the same as with standard 3D-graphics. In addition, you can use a mouse rectangle selection to zoom-in fast to part of the spectrogram. Also, by using your mouse wheel, you can perform a fast zoom-in or zoom-out on a spectrogram view.


By dragging a rectangle selection while pressing Ctrl key, you can measure rectangle dimensions without zooming in.


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Spectrogram view is very useful and fast when used with 3D graphics created with the “Track changes as 3D graphics” option, because a big part of the graphic can simply be scrolled, and a new data is only drawn each time data in the origin window (for example, FFT) changes.


The time axis is always shown from left to right (X-axis). The direction of the frequency axis (Y-axis) can be changed by using the main menu option "3D Tools/Spectrogram frequency direction".


If you move your mouse cursor over spectrogram view, current X/Y values under the cursor will be shown as a tooltip.


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Spectrogram view makes it easy to draw spectrograms in SIGVIEW.