I have 3 signal sampled at 12 KHz frequency obtained from a motor rotating at constant 2000, 2020, and 2040 rpm. For 1 second signal recording I have 12,000 time samples. Depending on the frequency I can say (1/f) is the time period of oscillation.
But I am confused how to segment the signal with one time cycle from the whole signal, so that I can choose those many samples out of 12000 samples.
Is there any mathematical way to compute length of 1 cycle of signal when its sampling frequency and rpm are given, without observing the peak to peak in oscilloscope?