Method and apparatus for digitally processing and filtering signals in industrial control applications
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United States of America Patent
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Aug 16, 1994
Grant Date -
N/A
app pub date -
Dec 15, 1992
filing date -
Dec 15, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A device which is a combination of a method and apparatus and a filter, such as but not limited to, a conventional lag filter for digitally processing and filtering signals used in industrial control applications. The method and apparatus provides a factor which is used by the filter to process the digital signal at the input to the device. The method determines if the change in the input signal is either due to noise or a valid signal change. Information which gives a past analysis of the trend in direction of the signal at the input to the device is used in the method. The trend information includes a factor representative of the past history of the trend. The method uses the most recent trend indicator to determine to a reasonable degree of confidence if the signal currently at the input to the device is or is not characteristic of noise. If the signal at the input is not believed to be characteristic of noise, then the method adjusts the trend indicator by a tracking credit. The tracking credit is, in effect, a further degree of confidence that change in the input signal is not characteristic of noise. The method minimizes the tradeoff between valid signal response time and noise rejection associated with the prior art filters.
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