Most of spectral analysis tools in SIGVIEW are based on the FFT algorithm. Its main purpose is
to transform the signal from its time-domain representation into the frequency-domain
representation. For the detailed mathematical description of the algorithm and its interpretation,
please refer to the following internet resources:
By preparing a signal before using the FFT algorithm, changing
FFT calculation parameters or
post-processing its results, many different variations of the FFT transformation can be applied.
One of the most important features in SIGVIEW is the possibility to change most of these
parameters and easily observe and compare the results.
To apply FFT transformation to your signal in SIGVIEW, select some window containing a signal
and choose Signal tools/FFT option. An FFT result window will be created containing the FFT
result calculated according to your current Spectral analysis defaults.
You can change the
parameters for the already calculated FFT sequence anytime by choosing Edit/Properties option
from the main menu or Properties option from the context menu. The dialog for the editing of FFT
parameters is the same as the Spectral analysis defaults
dialog – you can find the detailed
description of its fields here.
To display the changes in the FFT result through time, you can use separate Time
FFT function
or Tracking changes as 3D graphics function in combination with the normal
FFT calculation.