I have 2 sensors, sensor A is sampling a signal at 1kHz, and sensor B is sampling the a signal at 100Hz.
Every timestamp that sensor B takes a measurement at is contained in sensor A. That is, sensor B takes a measurement essentially every 10th measurement taken by sensor A.
How should I downsample sensor A so that both data streams are 100Hz. Can I just pluck every 10th sample from sensor A, or should I low pass filter sensor A first? What frequency should the low pass filter be set at?
EDIT: It seems to me there should be no difference between taking every 10th sample or lowpass filtering if the signal I care about is less than 50Hz. Is that true?