Somat eDAQ
lite
218
I2773-4.4 en
Figure 15-5:
Unit step response of a typical linear-phase filter achieved by using a 37-tap
equiripple FIR filter twice
Notice that the unit step response of the filter has less overshoot than that of the
Butterworth filter. The response has a group delay of 37 samples, but the eDAQ
lite
compensates for the delay so that the filtered data displays no phase shift in the stored
data set. Normally decimation occurs after filtering. In this case, every fifth sample is
stored (decimation by five). The exact pattern of the stored data varies depending on
where the decimation occurs relative to the input step edge.
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