Abnormal sound detection device and abnormal sound detection method

An abnormal sound detection device includes a first learning unit that inputs a normal operating sound of the machine equipment, and registers a normal sound base spectrum from an amplitude spectrogram, a new sound/new vibration extraction unit that executes supervised nonnegative matrix factorizati...

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Bibliographic Details
Main Authors Endo, Takashi, Kawaguchi, Yohei
Format Patent
LanguageEnglish
Published 10.11.2020
Subjects
ACOUSTICS
CALCULATING
COMPUTER SYSTEMS BASED ON SPECIFIC COMPUTATIONAL MODELS
COMPUTING
COUNTING
MUSICAL INSTRUMENTS
PHYSICS
SPEECH ANALYSIS OR SYNTHESIS
SPEECH OR AUDIO CODING OR DECODING
SPEECH OR VOICE PROCESSING
SPEECH RECOGNITION
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Summary:An abnormal sound detection device includes a first learning unit that inputs a normal operating sound of the machine equipment, and registers a normal sound base spectrum from an amplitude spectrogram, a new sound/new vibration extraction unit that executes supervised nonnegative matrix factorization (NMF) using the normal sound base spectrum as teacher data on an acoustic signal input during diagnosis, and outputs a nonnegative matrix not allowed to be approximated with a low rank in the normal sound base spectrum, a second learning unit that extracts a new sound/new vibration component from the normal operating sound of the machine equipment, learns a normal sound model from the new sound/new vibration component, and registers the normal sound model, and an abnormality detection unit that computes a probability that the new sound/new vibration component extracted from the acoustic signal of the machine equipment during diagnosis is generated from the normal sound model.
Bibliography:Application Number: US201916565820