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The effect of decimating data on MTIE results

Shown in figure 8.26 is a plot of the MTIE of white gaussian noise both before and after it has been decimated by a factor of 3.

**Figure 8.26:** Decimated and un-decimated white gaussian noise
$\begin{figure} \centerline{ \epsfig {file=eps/mtiewgndec.eps, width=10cm} }\end{figure}$

It can be seen that decimating affects the results. This can be seen more clearly if the MTIE data produced by an early model of a primary reference clock is considered. From figure 8.27 it can clearly be seen that the use of a decimate block would not be appropriate as the MTIE of data that has been decimated from 30Hz to 3Hz shown by the broken line is clearly of a different form.

**Figure 8.27:** MTIE of an early PRC model for decimated and un-decimated data
$\begin{figure} \centerline{ \epsfig {file=eps/decimatemtie.eps, width=10cm} }\end{figure}$

Mark J Ivens
11/13/1997