Interpolate from slower sample rate to faster sample rate in Simulink?

Question

Thomas Marullo 2012-7-26

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I have a source that runs at 0.1 seconds and my controller needs to run at 0.01 seconds. I want to interpolate the source into the faster rate without delay. For instance, Source in 0.1 0, 10, 20

Resulting Controller Source in 0.01 0 0 0 0 0 0 0 0 0 0, 1 2 3 4 5 6 7 8 9 10, 11 12 13 14 15 16 17 18 19 20,

Is there anything that does this in Simulink? The input sample rate is slower than the output sample rate and the output is a linear interpolation.

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Ryan G 2012-7-26

Will you have access to all of the source data at the start of running the controller?

Thomas Marullo 2012-7-27

Yes, I have complete access.

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Answer 1

Kaustubha Govind 2012-7-26

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The FIR Interpolation block from the DSP System Toolbox might be what you need, but you will need to adjust the filter coefficients and Interpolation factor to get what you need. Typically the Rate Transition block is used for rate conversion in Simulink, but it does not perform interpolation.