LTI_SIM

LTI System Simulation Environment
Version 1.0

General Information

Getting started...

At the Unix workstations
On a Macintosh
On a PC (running Windows)

Important note about closing figure windows

It is very important that the figure windows are closed by using the 'Close figure' function in the figure's menu. If the figures are closed by clicking in the upper left corner of the figure window, or by typing close at the Matlab command prompt, the program will NOT work.

A short desciption of user defined functions

This is how the default input signal is defined.

function y=sinfun(start, samp_time, stop, period)
  if nargin < 4,
    period = 1;
  end;
  t = start:samp_time:stop;      
  y = sin(2*pi*t./period);
end;

User defined function must take the following arguments.

START - The time the signal starts.
SAMP_TIME - Time between the samples in the signal vector.
STOP - The time the signal stops.
PERIOD - Period time of periodic signals. This argument is not passed to the function if aperiodic waveforms are chosen. Therefore the if-statement in the beginning of the function is very important.

Note: Neither is it possible to specify the parameter stop for periodic functions nor the parameter period for aperiodic signals. It is true that the period always equals stop-start and one could easily be misled to think that this parameter could be removed. This is not the case, however, since the same functions can be called to generate both periodic and aperiodic signals. Take the sinfun example above. What would happen if we always divided t by stop-start ?

Last modified 1997-01-08 by johanc