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Re: data resampling

(1) Matlab has a downsample command and a decimate command and they are
(2) Sensor data is often collected such that it is low frequency and
aliased.  This means it has to be handled with statistics rather than
signal processing.  This may include some machine learning and pattern
classification techniques.
(3) The data showed on the graph appears to change more rapidly than once
per second, so valuable information might be lost at 1 KHz.
(4) It may be necessary to collect more data at the correct sampling rate
to determine how the data at the 30 KHz rate compares to the data at the
correct sampling rate.  It depends what features you are looking for.

Linda Seltzer
DSP Engineer, Consultant