公开(公告)号：US20230400486A1

公开(公告)日：2023-12-14

申请号：US18118399

申请日：2023-03-07

Applicant: Hitachi, Ltd.

Inventor： Shinji NAKAGAWA ,  Soichiro TANAKA ,  Masato KUNITOMO ,  Kazuaki TOKUNAGA

IPC: G01R23/02

CPC classification number: G01R23/02

Abstract: 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 X1 and a signal with temporal variation in amplitude X2, the separating performed by a signal separator; performing processing of dimensionality reduction, compression, or the like, on the oscillation signal X1 so as to extract a feature value (information) included in the oscillation signal X1; and outputting a restored signal X1′ that is restored from the oscillation signal X1 by 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 X1 restorer.