.Modelica_LinearSystems2.Controller.Examples.Interpolator

Information

This example demonstrates the usage of the Interpolator block. This block is used in multi-rate controllers to interpolate between two different sample rates. In this example, a sampled sine-signal is interpolated in different ways:

1. A "sine" signal (= blue and red curve in the figure below) is sampled with 20*Ts (= green curve in the figure below) where Ts is the sample time of 1 ms.
2. This "sine" signal is interpolated with "interpolator1" which has a "continous" blockType. In this case, the interpolator just passes the input signal (y = u) and therefore the signal is identical to the sine signal (therefore the blue and the red curve are the same).
3. The sampled sine signal is interpolated with "interpolator2" to arrive at a sample time of 4*Ts (= violet curve in the figure below). This gives a 20*Ts delay and a sine signal sampled with 4*Ts (instead of 20*Ts).
4. In order to remove frequencies introduced by the interpolation, "interpolator3" additionally filters the linearly interpolated signal with a mean value filter of the same length (= black curve in the figure below). This gives an additional delay (= a total delay of 24*Ts), but results in a filtered interpolation signal.