Method and apparatus for identifying anomalies of a signal
AssigneeHewlett-Packard Development Company, L.P.
InventorsChoudur Lakshminarayan, Krishnamurthy Viswanathan
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Abstract
A method and apparatus are disclosed for identifying anomalies of a signal, by analyzing a signal using a frequency-based technique, analyzing results of the frequency-based analysis using a statistical analysis technique, determining one or more limits based on the statistical analysis, and comparing a frequency domain representation of the signal to the limits to identify anomalies of the signal.
Claims20
A method for identifying anomalies of a signal, comprising:
- transforming a signal using a frequency-based transform to determine frequency transform coefficients;
- squaring said frequency transform coefficients to yield squared coefficients;
- ordering said squared coefficients;
- analyzing said squared coefficients using a statistical analysis technique;
- determining one or more limits based at least on said statistical analysis;
- comparing said squared coefficients as have been ordered to said limits;
- and
- identifying anomalies of said signal, based on elements thereof beyond said limits.
A method for identifying anomalies of a signal, comprising:
- transforming a signal using a short-time Fourier transform to determine Fourier coefficients;
- squaring each Fourier coefficient;
- analyzing said squared coefficients using a statistical analysis technique;
- determining one or more limits based at least on said statistical analysis;
- comparing said squared coefficients to said limits;
- determining elements of said signal beyond said limits;
- and
- identifying anomalies of said signal, based at least on correspondence to said elements,
- wherein said statistical analysis technique is a quantile analysis and said determining of one or more said limits further comprises calculating said one or more limits based at least on results of said quantile analysis,
- and wherein said comparison of said Fourier coefficients to said limits further comprises ordering said modified coefficients in ascending order for comparison to said quantile limits.
An apparatus for automatically identifying anomalies of a signal, comprising:
- a processor for transforming a signal using a Fourier transform to determine Fourier coefficients, analyzing squares of said Fourier coefficients using a statistical analysis technique, determining one or more limits based on said statistical analysis technique, ordering said squares, comparing said squares as have been ordered to said limits, and identifying anomalies of said signal based on elements thereof beyond said limits.
Dependencies are inferred from the claim text.