Digital low pass filter
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United States of America Patent
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Aug 1, 2017
Grant Date -
Mar 2, 2017
app pub date -
Aug 24, 2016
filing date -
Aug 28, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
A digital low pass filter for producing an output value given a target value includes a memory which stores a scaling factor, a previous output value, a previous intermediate value, and the target value; the difference between the target value and the previous output value is evaluated, and then multiplied by the scaling factor to produce an intermediate value; the previous intermediate value is multiplied by the scaling factor minus unity; the output value is evaluated by summing the previous output value, twice the intermediate value, and the previous intermediate value multiplied by the scaling factor minus unity; the output value is then stored in memory as the previous output value, and the intermediate value as the previous intermediate value, such that the filter provides a second-order response but requires fewer hardware multipliers than the direct form implementation of a second-order filter.
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