Configuring Display

In order to configure spectral plots press the Settings button. The Settings dialog allows you to choose the preferred scale (linear or logarithmic), adjust the "spectral floor", fix details of the available spectral estimation methods (FFT or AR) and select a number and distance of frames (time slices) included in a time-frequency plot. See section on Spectral analysis for more comments on specific spectrum settings.

To save current spectrum settings as the default ones press the Save button. Finally, if all that you need is to switch between the spectral estimation methods without modifying the corresponding settings, use the FFT/AR radio buttons situated in the lower left corner of the Spectral view dialog.

Normalization is another important feature of the time-frequency display. When the Normalize box is checked all plots are automatically scaled with respect to the maximum locally observed (across both time and frequency) value of the spectral density function. Normalization is not convenient if you wish to compare spectral views of different fragments of the signal. In all such cases uncheck the Normalize box. From this point on all 3-D spectral plots will be shown in an absolute scale - until you check the Normalize box again.