Decimate
Contents
The Decimate filter reduces the number of transitions on a signal resulting in a smoother signal and less memory usage. The filter is used for continuous signals only.
Use the Properties box to specify the following properties:
•Lower Time Tolerance
•Lower Value Tolerance
•Upper Time Tolerance
•Upper Value Tolerance
The larger the tolerances, the more points are eliminated.
These four properties define a "tolerance box" around each point (transition) in the signal curve. When a transition is received, the system attempts to draw a line from the current tolerance box to the first tolerance box that falls within the tolerance boxes of all previous points. If such a line is possible, the transition is filtered out. If the line is outside the tolerances, the filter transmits the previous transition and it becomes the new first point.
When another transition is received, the process continues with the new first point. The second and third points shown above are eliminated.
