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

Claim 9:
10. The anomaly detection system according to claim 9,
wherein the hierarchical conditional vector generation unit generates a second hierarchical conditional vector based on the device identification information,
the extraction unit extracts a second target device feature amount vector indicating a feature amount of a second acoustic signal by analyzing the second acoustic signal acquired from a second target device,
the trained identification network performs background noise determination of determining a background noise level of a surrounding environment of the second target device by analyzing the second hierarchical conditional vector and the second target device feature amount vector, and generates second background noise level information indicating a second background noise level, and selects an anomaly determination threshold based on the second background noise level,
the trained generation network generates a second false vector simulating the second target device feature amount vector based on the second hierarchical conditional vector and a second noise vector generated based on a baseline acoustic signal of the second target device, and calculates an anomaly score for the second target device feature amount vector based on the second target device feature amount vector and the second false vector, and
the anomaly determination unit generates an anomaly detection result indicating whether an anomaly exists in the second target device feature amount vector based on the anomaly score and the anomaly determination threshold.