Hitachi, Ltd.

Soichiro Tanaka

Kazuaki Tokunaga

Masato Kunitomo

A highly accurate feature extraction is performed on a signal with temporal variation in amplitude, and this signal is restored to detect a state of a transmission source (output source) of this signal to be normal or abnormal. A signal processing method includes: separating a signal X into an oscillation signal with a constant amplitude Xand a signal with temporal variation in amplitude X, the separating performed by a signal separator; performing processing of dimensionality reduction, compression, or the like, on the oscillation signal Xso as to extract a feature value (information) included in the oscillation signal X; and outputting a restored signal X' that is restored from the oscillation signal Xby performing processing inverse to the processing of dimensionality reduction, compression, or the like, based on the extracted feature value, performing the processing, the inverse processing, and the outputting performed by a signal Xrestorer.

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Tokyo, Japan

Soichiro Tanaka