| CPC G01M 99/005 (2013.01) | 7 Claims |
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1. An anomaly score estimation apparatus which estimates an anomaly score of an observed signal, the anomaly score estimation apparatus comprising
processing circuitry configured to:
execute an anomaly score calculation processing, wherein the anomaly score calculation processing comprises correcting the anomaly score calculated from the observed signal, and wherein, when a similarity between the observed signal and a registered normal sound increases, a value of the anomaly score decreases; and
execute a feature extraction processing, wherein the feature extraction processing further comprises extracting a feature amount with a fixed-length from a time-series acoustic signal with an arbitrary length,
wherein the feature extraction processing is optimized to extract, from the time-series acoustic signal, the feature amount, the feature amount reflects a feature of an unknown normal sound, the time-series acoustic signal includes at least a known normal sound and the unknown normal sound,
the anomaly score calculation processing further comprises calculating a similarity score by a similarity score function, the similarity score function is learned by using the feature amount extracted from the time-series acoustic signal, and the time-series acoustic signal includes at least a normal sound.
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