Field device with capability of calculating digital filter coefficients

A process control device comprising:

• a processor;
• a memory storing a digital filter design algorithm;
• a first input adapted to receive digital filter design parameter values for specifying desired frequency response characteristics of a digital filter;
• and
• a second input for receiving process variable data;
• the processor adapted to execute the digital filter design algorithm to create a digital filter having the desired frequency response characteristics, and apply the digital filter to the process variable data.

A method of filtering process variable data comprising:

• implementing a digital filter design algorithm in a process related control device;
• exposing one or more filter parameters to an interface whereby filter parameter values may be provided to the digital filter design algorithm;
• providing filter parameter values to the digital filter design algorithm;
• calculating digital filter coefficients using the digital filter design algorithm based on the provided filter parameter values;
• and
• applying a digital filter having the calculated digital filter coefficient to the process variable data.