Method and device for detecting drifts, jumps and/or outliers of measurement values
First Claim
1. A method for detecting an alarm state in a signal while avoiding false alarms from gradual signal drifts and outlier measurements, comprising:
- obtaining a measurement value of the signal at a current time;
determining a position parameter and a deviation parameter from previous measurement values of the signal that were measured during a time window, wherein the time window is offset in time by an adjustable time delay from the current time;
computing at least one of an evaluation quantity, an alarm threshold, and an outlier threshold based on the measurement value, the position parameter, and the deviation parameter; and
indicating an alarm state in response to the evaluation quantity exceeding the alarm threshold but not the outlier threshold, wherein the measurement value is determined to be an outlier measurement if the evaluation quantity exceeds the outlier threshold, whereby the alarm state indicates a significant drift or jump of the signal.
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Abstract
A method for detection an alarm state of measurement signal values received by means for detecting measurement values, wherein an alarm state is triggered when for a currently received measurement signal value at least one pre-set limit value is exceeded, has a faster recognition of an alarm situation and at the same time a lower rate of false alarms when in a first step for measurement signal values which are subsequent in time their position parameter (2) and a corresponding deviation parameter (3) of the measurement signal values from the position parameter is calculated in an adjustable time window, wherein in a second step each further subsequent measurement signal value is compared to the position parameter (2) an weighted with the deviation parameter (3) in order to obtain a respective evaluation quantity, and wherein in a third step an outlier state (6) is detected when the evaluation quantity exceeds an adjustable outlier parameter, whereas an alarm state (8) indicating the presence of a significant drift or jump of the measurement signal values is detected when the evaluation quantity exceeds an adjustable alarm parameter.
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Citations
36 Claims
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1. A method for detecting an alarm state in a signal while avoiding false alarms from gradual signal drifts and outlier measurements, comprising:
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obtaining a measurement value of the signal at a current time;
determining a position parameter and a deviation parameter from previous measurement values of the signal that were measured during a time window, wherein the time window is offset in time by an adjustable time delay from the current time;
computing at least one of an evaluation quantity, an alarm threshold, and an outlier threshold based on the measurement value, the position parameter, and the deviation parameter; and
indicating an alarm state in response to the evaluation quantity exceeding the alarm threshold but not the outlier threshold, wherein the measurement value is determined to be an outlier measurement if the evaluation quantity exceeds the outlier threshold, whereby the alarm state indicates a significant drift or jump of the signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. An apparatus for detecting an alarm state in a signal while avoiding false alarms from gradual signal drifts and outlier measurements, comprising:
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means for obtaining a measurement value of the signal at a current time;
a processor for determining a position parameter and a deviation parameter from previous measurement values of the signal that were measured during a time window, wherein the time window is offset in time by the processor by an adjustable time delay from the current time, the processor computing at least one of an evaluation quantity, an alarm threshold, and an outlier threshold based on the measurement value, the position parameter, and the deviation parameter, wherein the processor determines that a measurement value is an outlier measurement if the evaluation quantity exceeds the outlier threshold; and
means for indicating an alarm state in response to the processor determining that the evaluation quantity exceeds the alarm threshold but not the outlier threshold, whereby the alarm state indicates a significant drift or jump of the signal. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. An article of manufacture comprising a computer program carrier readable by a computer and embodying one or more instructions executable by the computer to detect an alarm state in a signal while avoiding false alarms from gradual signal drifts and outlier measurements, the computer program comprising:
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program instructions for obtaining a measurement value of the signal at a current time;
program instructions for determining a position parameter and a deviation parameter from previous measurement values of the signal that were measured during a time window, wherein the time window is offset in time by an adjustable time delay from the current time;
program instructions for computing at least one of an evaluation quantity, an alarm threshold, and an outlier threshold based on the measurement value, the position parameter, and the deviation parameter; and
program instructions for indicating an alarm state in response to the evaluation quantity exceeding the alarm threshold but not the outlier threshold, wherein the measurement value is determined to be an outlier measurement if the evaluation quantity exceeds the outlier threshold, whereby the alarm state indicates a significant drift or jump of the signal. - View Dependent Claims (32, 33, 34, 35, 36)
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Specification