Downsampling of RPM traces

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MAT-Magic
MAT-Magic 2020-1-10
编辑： MAT-Magic 2020-1-22
Hi,
I have RPM trace signal (respiratory data) sampled at 26 Hz. I want to downsample RPM trace signal to 5.2 Hz. Does anyone know how to downsample this trace signal to 5.2 Hz?
Thanks in advance.

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Star Strider
Star Strider 2020-1-10
I assume that the signal is sampled regularly, and a fixed sampling interval.
Use the Signal Processing Toolbox resample function. It will do exactly what you want.
A prototype call to it would be:
RPMrs = resample(RPM, 52, 260);
so the output will be sampled at 5.2/26 of the original rate.
To calculate a new time vector for it, use the linspace function.
Note that if it is not uniformly sampled, first follow the procedure in Resample a Nonuniformly Sampled Data Set, then do the rate resampling.
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MAT-Magic
MAT-Magic 2020-1-22
Thank you so much Sir !!!
Star Strider
Star Strider 2020-1-22
As always, my pleasure!

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