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We propose discriminative neighborhood smoothing of generative anomaly scores for anomalous sound detection. While the discriminative approach is known to achieve better performance than generative approaches often, we have found that it…

Audio and Speech Processing · Electrical Eng. & Systems 2024-03-19 Takuya Fujimura , Keisuke Imoto , Tomoki Toda

To develop a machine sound monitoring system, a method for detecting anomalous sound is proposed. Exact likelihood estimation using Normalizing Flows is a promising technique for unsupervised anomaly detection, but it can fail at…

Audio and Speech Processing · Electrical Eng. & Systems 2021-03-17 Kota Dohi , Takashi Endo , Harsh Purohit , Ryo Tanabe , Yohei Kawaguchi

Modern manufacturing is now deeply integrating new technologies such as 5G, Internet-of-things (IoT), and cloud/edge computing to shape manufacturing to a new level -- Smart Factory. Autonomic anomaly detection (e.g., malfunctioning…

Networking and Internet Architecture · Computer Science 2021-10-05 Huanzhuo Wu , Yunbin Shen , Xun Xiao , Artur Hecker , Frank H. P. Fitzek

Anomalous sound detection (ASD) in the wild requires robustness to distribution shifts such as unseen low-SNR input mixtures of machine and noise types. State-of-the-art systems extract embeddings from an adapted audio encoder and detect…

Audio and Speech Processing · Electrical Eng. & Systems 2025-10-30 Phurich Saengthong , Tomoya Nishida , Kota Dohi , Natsuo Yamashita , Yohei Kawaguchi

Anomaly detection has many important applications, such as monitoring industrial equipment. Despite recent advances in anomaly detection with deep-learning methods, it is unclear how existing solutions would perform under…

Sound · Computer Science 2022-04-06 Bingqing Chen , Luca Bondi , Samarjit Das

In this paper, we propose an anomaly detection algorithm for machine sounds with a deep complex network trained by self-supervision. Using the fact that phase continuity information is crucial for detecting abnormalities in time-series…

Audio and Speech Processing · Electrical Eng. & Systems 2023-12-22 Miseul Kim , Minh Tri Ho , Hong-Goo Kang

This paper introduces an active learning (AL) framework for anomalous sound detection (ASD) in machine condition monitoring system. Typically, ASD models are trained solely on normal samples due to the scarcity of anomalous data, leading to…

Sound · Computer Science 2024-08-13 Tuan Vu Ho , Kota Dohi , Yohei Kawaguchi

Anomalous Sound Detection (ASD) aims at identifying anomalous sounds from machines and has gained extensive research interests from both academia and industry. However, the uncertainty of anomaly location and much redundant information such…

Sound · Computer Science 2025-08-22 Guirui Zhong , Qing Wang , Jun Du , Lei Wang , Mingqi Cai , Xin Fang

This paper presents a unified AI framework for high-accuracy audio anomaly detection by integrating advanced noise reduction, feature extraction, and machine learning modeling techniques. The approach combines spectral subtraction and…

Sound · Computer Science 2025-06-02 Hamideh Khaleghpour , Brett McKinney

Deep learning approaches have recently achieved impressive performance on both audio source separation and sound classification. Most audio source separation approaches focus only on separating sources belonging to a restricted domain of…

Sound · Computer Science 2021-05-14 Efthymios Tzinis , Scott Wisdom , John R. Hershey , Aren Jansen , Daniel P. W. Ellis

Anomaly detection is a fundamental task in machine learning and data mining, with significant applications in cybersecurity, industrial fault diagnosis, and clinical disease monitoring. Traditional methods, such as statistical modeling and…

Machine Learning · Computer Science 2025-05-09 Yi Chen

Anomalous sound detection (ASD) is, nowadays, one of the topical subjects in machine listening discipline. Unsupervised detection is attracting a lot of interest due to its immediate applicability in many fields. For example, related to…

Audio and Speech Processing · Electrical Eng. & Systems 2020-06-30 Sergi Perez-Castanos , Javier Naranjo-Alcazar , Pedro Zuccarello , Maximo Cobos

In anomalous sound detection, the discriminative method has demonstrated superior performance. This approach constructs a discriminative feature space through the classification of the meta-information labels for normal sounds. This feature…

Audio and Speech Processing · Electrical Eng. & Systems 2024-09-17 Takuya Fujimura , Ibuki Kuroyanagi , Tomoki Toda

In industrial applications, the early detection of malfunctioning factory machinery is crucial. In this paper, we consider acoustic malfunction detection via transfer learning. Contrary to the majority of current approaches which are based…

Audio and Speech Processing · Electrical Eng. & Systems 2021-02-19 Robert Müller , Fabian Ritz , Steffen Illium , Claudia Linnhoff-Popien

This paper proposes a method for unsupervised anomalous sound detection (UASD) and captioning the reason for detection. While there is a method that captions the difference between given normal and anomalous sound pairs, it is assumed to be…

Audio and Speech Processing · Electrical Eng. & Systems 2024-10-30 Ryoya Ogura , Tomoya Nishida , Yohei Kawaguchi

In this work, a novel deep neural network, designed to enhance the efficiency and effectiveness of unsupervised sound anomaly detection, is presented. The proposed model exploits an attention module and separable convolutions to identify…

Audio and Speech Processing · Electrical Eng. & Systems 2024-10-14 Michael Neri , Marco Carli

This paper addresses the increasingly prominent problem of anomaly detection in distributed systems. It proposes a detection method based on federated contrastive learning. The goal is to overcome the limitations of traditional centralized…

Machine Learning · Computer Science 2025-06-25 Renzi Meng , Heyi Wang , Yumeng Sun , Qiyuan Wu , Lian Lian , Renhan Zhang

The outlier exposure method is an effective approach to address the unsupervised anomaly sound detection problem. The key focus of this method is how to make the model learn the distribution space of normal data. Based on biological…

Sound · Computer Science 2025-09-22 Xinxin Meng , Jiangtao Guo , Yunxiang Zhang , Shun Huang

Today, data collection has improved in various areas, and the medical domain is no exception. Auscultation, as an important diagnostic technique for physicians, due to the progress and availability of digital stethoscopes, lends itself well…

This paper proposes an anomaly detection method based on federated learning to address key challenges in multi-tenant cloud environments, including data privacy leakage, heterogeneous resource behavior, and the limitations of centralized…

Machine Learning · Computer Science 2025-08-15 Yuxi Wang , Heyao Liu , Nyutian Long , Guanzi Yao