Patent ID: 11869492
Assignee: HITACHI, LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 6:
7. An anomaly detection system
wherein a target device, a sensor unit configured to acquire an acoustic signal from the target device, and an anomaly detection apparatus that analyzes the acoustic signal to determine presence or absence of an anomaly are connected to each other via a communication network, and
the anomaly detection apparatus includes:
one or more processors and one or more non-transitory computer-readable storage media, the non-transitory computer-readable storage media having stored thereon at least:
a device identification database that stores device identification information for identifying a specific device for each type of device,
a hierarchical conditional vector generation unit that generates a hierarchical conditional vector based on the device identification information,
an extraction unit that extracts a target device feature amount vector indicating a feature amount of the acoustic signal by receiving and analyzing the acoustic signal from the sensor unit,
a hierarchical condition adversarial neural network that performs background noise determination for determining a background noise level of a surrounding environment of the target device by analyzing the hierarchical conditional vector and the target device feature amount vector, and generates background noise level information indicating the determined background noise level,
a noise generation unit that generates a noise signal and noise vector based on the noise signal, the noise vector being input to the hierarchical condition adversarial neural network; and
an anomaly determination unit that determines whether an anomaly exists in the target device feature amount vector by using at least an anomaly determination threshold selected according to the background noise level.