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46 Document No. 001-64846 Rev. *I Getting Started with CapSense
®
Figure 3-20. Jitter Filter Applied to Noisy Centroid Data
Unfiltered
Filtered
3.4.4.2 Jitter Filter for Raw Counts
Although the jitter filter is intended for use with noisy slider data, it is also used with noisy buttons. If the change in the
current input exceeds a set threshold level, the output is changed to the previous input plus or minus the threshold
amount. The output is not changed if the current input changes by less than the threshold amount. The general
equation for a jitter filter applied to buttons is:

 
  Equation 23
 
 
 
 

Figure 3-21 and Figure 3-22 shows the result of using a jitter filter on real button data with a large component of
periodic noise.
Figure 3-21. Jitter Filter for Button Noise
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