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

Asked by Thomas Marullo on 26 Jul 2012
Latest activity Commented on by Thomas Marullo on 27 Jul 2012

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.

2 Comments

Ryan G on 26 Jul 2012

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

Thomas Marullo on 27 Jul 2012

Yes, I have complete access.

Thomas Marullo

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1 Answer

Answer by Kaustubha Govind on 26 Jul 2012

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.

1 Comment

Thomas Marullo on 26 Jul 2012

This has potential to work, but forgive my lack of knowledge on FIRs. How would I make the interpolation linear with this block?

Kaustubha Govind

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