Translations:Sampling geophysical data/7/en

In the example, our signal was low-pass-filtered with a cutoff frequency of 125 Hz, and we chose a sampling interval of 0.004 s. That is, we chose our sampling rate (250 samples/s) as twice the cutoff frequency (125 cycles/s). In other words, there are only two samples per cycle at the cutoff frequency. This sampling rate is the lowest allowable for the sampling theorem to be applicable. Any lower sampling rate, for example, 125 samples/s, or a sampling interval of 0.008 s, would not be adequate for signal construction as required by the sampling theorem.