Field device with capability of calculating digital filter coefficients
First Claim
1. A system for implementing a digital filter for filtering process variable data, the system comprising:
- an intelligent device adapted to receive process variable data, implement a digital filter design algorithm, and apply a digital filter to the received process variable data; and
an interface adapted to expose digital filter design parameters such that digital filter design parameter values may be provided to the digital filter design algorithm to design a digital filter having desired frequency response characteristics to be applied to the received process variable data.
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Abstract
A digital filter design algorithm is implemented directly within a process control field device or other process related equipment. Filter design parameters are exposed so that filter design parameter values may be provided to the digital filter design algorithm so that the digital filter design algorithm may calculate digital filter coefficients for a digital filter having desired frequency response characteristics. The digital filter design parameter values may be provided by a user, or may be provided as process variable data output from a process control field device or other process related equipment. Once the coefficients of the digital filter having the desired frequency response characteristics have been calculated, the digital filter may be applied to process variable data received by the process control field device or other process related equipment.
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Citations
52 Claims
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1. A system for implementing a digital filter for filtering process variable data, the system comprising:
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an intelligent device adapted to receive process variable data, implement a digital filter design algorithm, and apply a digital filter to the received process variable data; and an interface adapted to expose digital filter design parameters such that digital filter design parameter values may be provided to the digital filter design algorithm to design a digital filter having desired frequency response characteristics to be applied to the received process variable data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A process control device comprising:
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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. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. A method of filtering process variable data comprising:
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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. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52)
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Specification