Signal generator

A signal generator controls the signal emanating from an input line, when an NNetSimu model is running.

Parameters
A signal generator has a total of five parameters that describe its behavior.
 * Parameters for the base signal
 * (1) Base frequency
 * (2) Base amplitude
 * Parameters for the stimulus signal
 * (3) Maximum frequency
 * (4) Maximum amplitude
 * (5) Time for maximum signal intensity

Generated signal
During normal operation, a signal generator generates a signal with base frequency and base amplitude. When a stimulus is triggered, the signal generator switsches to the stimulus parameters. Starting from the base parameters (1) ans (2), frequency and amplitude rise, until the maximum values (3) and (4) are reached. The parameter for maximal signal density (5) determines the time, when this peak is reached. After the peak, frequency and amplitude gradually sink again, until they finally reach the base values again.

The ascent to the peak intensity of frequency and amplitude ist steep, the descent after the peak is rather flat (see picture). NNetSimu uses the function to model f(x) = ax * b^(1-x) this behaviour.

Creating and selecting signal generators
A model can have several signal generators to model different behaviour of input lines. Every model has at least one signal generator, called "Standard". If necessary, the user can create additional signal generators with the "Create new" command in the submenu "Signal generator". New signal generators are initially named "SigGen 1", "SigGen 2" and so on. The signal designer has a commond to change the name at the user's discretion. All user defined signal generators are listed in the "Signal generator" submenu between the entries "Standard" and "Create new".

Editing a signal generator
The tool to visualize and manipulate a signal generator is the signal designer.