) determines the part of the time data the ETF is calculated from. It also determines if the time data is to be windowed before computing the ETF. Energy-Time-Frequency (ETC)
The Energy-Time-Frequency mode is the same as a spectrogram. The data used for computing the waterfall is the windowed measurement data. The time window on the data in General Frequency Domain Settings (the time window is found clicking the button ) determines the part of the time data the ETF is calculated from. It also determines if the time data is to be windowed before computing the ETF.
The windowed measurement data are divided into slices and the Fourier transform is computed for each slice. Special settings for this mode are found in the bottom right of this dialog box under Energy-Time-Frequency (ETF) calculation settings. The special settings determine the size of the data used for computing each slice (FFT size) and the window type applied on each of the slices. Note that no zero-padding is applied in computing Energy-Time-Frequency mode. The DC-component, if any, is not removed from each slice.