Patent ID: 7825721
Filing Date: 2010-11-02
Classification: H03H

Abstract:
1. A method for filtering a signal corresponding to a sensed parameter comprising: a controller determining a first cumulative change in value of the parameter with respect to consecutively sensed pairs of samples of the parameter, a first of the pairs of the samples comprising, in time-sampled order, a first previous value and a second, previous value, a second of the pairs of the samples comprising the first previous value and a current value; said controller determining a second cumulative change in value of the parameter with respect to the first of the pairs of the samples and a third of the pairs of the samples, the third of the pairs of samples comprising the second previous value and the current value; said controller outputting a filtered signal, the filtered signal containing information corresponding to the second previous value if the first cumulative change and the second cumulative change are within respective predetermined out-of-bounds limits; said controller maintaining output of the filtered signal with the information corresponding to the second previous value if at least one of the first cumulative change and the second cumulative change is not within the respective predetermined out-of-bounds limits; and said controller modifying the output of the filtered signal such that the filtered signal contains information corresponding to a subsequent second previous value if a corresponding subsequent first cumulative change and a corresponding subsequent second cumulative change are within respective predetermined in-bounds limits, the in-bounds limits being more restrictive than the out-of-bounds limits.