Geopsy: Waveform menu
Basic processing that can be applied to an ensemble of signals are all listed in menu "Waveforms". To gain access to it, a signal viewer must be active. It can be any of them: a table, a graphic, a map or a chronogram.
The waveform menu is closely related to the waveform console. Whenever an item is selected in this menu, the action is executed and logged in the history part of the waveform console. The parameters entered through the dialog boxes are converted into function arguments. The results of the processing is always displayed in the original window. The original signals are never touched by these actions although they disappeared from the display. Even the number of signals in the display may change (e.g. merging signals).
For instance, the history generated by a Wikipedia:Butterworth filter filter depicted in the figure would be as follow
:
filter("Butterworth", "BandPass", 10, 20, 4);
save("filter(Butterworth, BandPass, 10, 20, 4)");
The first line is the action itself which filters the signals between 10 Hz and 20 Hz with an order 4. The second line saves the results to a local stack under the name "filter..." given between double quotes. Saving each step is mandatory to undo latest processing. At any time, one can revert to any of the previous states and start again another processing. See waveform console for more details how to play with this widget.
