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Method and apparatus for eliminating aliasing

  • US 8,788,069 B2
  • Filed: 09/27/2011
  • Issued: 07/22/2014
  • Est. Priority Date: 09/27/2011
  • Status: Active Grant
First Claim
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1. A method of reducing aliasing in a process control system wherein the process control system comprises at least one analog device and an analog to digital convertor, the method comprising:

  • setting a module execution rate for a module in the process control system;

    determining a Nyquist frequency for the module based on the module execution rate;

    determining a filtering after the analog to digital convertor based on the module execution rate;

    in the filter after the analog to digital convertor, setting the data sampling rate in the analog to digital convertor based on the module execution rate; and

    attenuating a frequency content of the measurement signal at and above the Nyquist frequency for the module.

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