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United States of America Patent
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Dec 23, 1997
Grant Date -
N/A
app pub date -
Apr 2, 1996
filing date -
Jul 2, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Difficulty is experienced where filters are required to provide a high level of noise reduction and a fast step response in systems where a large input step in comparison to the final resolution may occur. A suitable filter comprises a variable length averaging filter, an averaging sample counter, the count of which is reduced by a predetermined factor when the count reaches a maximum value, and a spike counter, the count of which is incremented when the difference between an input sample and the current filter output exceeds a predetermined value, the sample count being reset to 1 when the spike count reaches a predetermined value, the filter output being otherwise maintained at the previous output.
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