226 research outputs found
Time-series Anomaly Detection based on Difference Subspace between Signal Subspaces
This paper proposes a new method for anomaly detection in time-series data by
incorporating the concept of difference subspace into the singular spectrum
analysis (SSA). The key idea is to monitor slight temporal variations of the
difference subspace between two signal subspaces corresponding to the past and
present time-series data, as anomaly score. It is a natural generalization of
the conventional SSA-based method which measures the minimum angle between the
two signal subspaces as the degree of changes. By replacing the minimum angle
with the difference subspace, our method boosts the performance while using the
SSA-based framework as it can capture the whole structural difference between
the two subspaces in its magnitude and direction. We demonstrate our method's
effectiveness through performance evaluations on public time-series datasets.Comment: 8pages, an acknowledgement was added to v
Few-shot Class-incremental Audio Classification Using Adaptively-refined Prototypes
New classes of sounds constantly emerge with a few samples, making it
challenging for models to adapt to dynamic acoustic environments. This
challenge motivates us to address the new problem of few-shot class-incremental
audio classification. This study aims to enable a model to continuously
recognize new classes of sounds with a few training samples of new classes
while remembering the learned ones. To this end, we propose a method to
generate discriminative prototypes and use them to expand the model's
classifier for recognizing sounds of new and learned classes. The model is
first trained with a random episodic training strategy, and then its backbone
is used to generate the prototypes. A dynamic relation projection module
refines the prototypes to enhance their discriminability. Results on two
datasets (derived from the corpora of Nsynth and FSD-MIX-CLIPS) show that the
proposed method exceeds three state-of-the-art methods in average accuracy and
performance dropping rate.Comment: 5 pages,2 figures, Accepted by Interspeech 202
Exploring Animal Behavior Through Sound: Volume 1
This open-access book empowers its readers to explore the acoustic world of animals. By listening to the sounds of nature, we can study animal behavior, distribution, and demographics; their habitat characteristics and needs; and the effects of noise. Sound recording is an efficient and affordable tool, independent of daylight and weather; and recorders may be left in place for many months at a time, continuously collecting data on animals and their environment. This book builds the skills and knowledge necessary to collect and interpret acoustic data from terrestrial and marine environments. Beginning with a history of sound recording, the chapters provide an overview of off-the-shelf recording equipment and analysis tools (including automated signal detectors and statistical methods); audiometric methods; acoustic terminology, quantities, and units; sound propagation in air and under water; soundscapes of terrestrial and marine habitats; animal acoustic and vibrational communication; echolocation; and the effects of noise. This book will be useful to students and researchers of animal ecology who wish to add acoustics to their toolbox, as well as to environmental managers in industry and government
Lesser spot-nosed monkeys coordinate alarm call production with associated Campbell’s monkeys
Open Access funding provided by Université de Neuchâtel. The Taï Monkey Project has been partially funded by grants from the Swiss National Science Foundation (#310030_185324; #31003A_166458). ALF has been supported by a Willy Müller Award from the Centre Suisse de Recherches Scientifiques en Côte d’Ivoire and the University of Neuchâtel. AB and QG have been funded by the University of Neuchâtel and the Swiss National Science Foundation (#31003A_166458). KZ is supported by ‘NCCR Evolving Language’, Swiss National Science Foundation Agreement #51NF40_180888.Forest monkeys often form semi-permanent mixed-species associations to increase group-size related anti-predator benefits without corresponding increases in resource competition. In this study, we analysed the alarm call system of lesser spot-nosed monkeys, a primate that spends most of its time in mixed-species groups while occupying the lowest and presumably most dangerous part of the forest canopy. In contrast to other primate species, we found no evidence for predator-specific alarm calls. Instead, males gave one general alarm call type (‘kroo’) to three main dangers (i.e., crowned eagles, leopards and falling trees) and a second call type (‘tcha-kow’) as a coordinated response to calls produced in non-predatory contexts (‘boom’) by associated male Campbell’s monkeys. Production of ‘kroo’ calls was also strongly affected by the alarm calling behaviour of male Campbell’s monkeys, suggesting that male lesser spot-nosed monkeys adjust their alarm call production to another species’ vocal behaviour. We discuss different hypotheses for this unusual phenomenon and propose that high predation pressure can lead to reliance on other species vocal behaviour to minimise predation.Publisher PDFPeer reviewe
Exploring Animal Behavior Through Sound: Volume 1
This open-access book empowers its readers to explore the acoustic world of animals. By listening to the sounds of nature, we can study animal behavior, distribution, and demographics; their habitat characteristics and needs; and the effects of noise. Sound recording is an efficient and affordable tool, independent of daylight and weather; and recorders may be left in place for many months at a time, continuously collecting data on animals and their environment. This book builds the skills and knowledge necessary to collect and interpret acoustic data from terrestrial and marine environments. Beginning with a history of sound recording, the chapters provide an overview of off-the-shelf recording equipment and analysis tools (including automated signal detectors and statistical methods); audiometric methods; acoustic terminology, quantities, and units; sound propagation in air and under water; soundscapes of terrestrial and marine habitats; animal acoustic and vibrational communication; echolocation; and the effects of noise. This book will be useful to students and researchers of animal ecology who wish to add acoustics to their toolbox, as well as to environmental managers in industry and government
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